Marta Revilla-León, Miguel Gómez-Polo, Irena Sailer, John C Kois, Rata Rokhshad
Objectives: To provide an overview of the current artificial intelligence (AI) based applications for assisting digital data acquisition and implant planning procedures.
Overview: A review of the main AI-based applications integrated into digital data acquisitions technologies (facial scanners (FS), intraoral scanners (IOSs), cone beam computed tomography (CBCT) devices, and jaw trackers) and computer-aided static implant planning programs are provided.
Conclusions: The main AI-based application integrated in some FS's programs involves the automatic alignment of facial and intraoral scans for virtual patient integration. The AI-based applications integrated into IOSs programs include scan cleaning, assist scanning, and automatic alignment between the implant scan body with its corresponding CAD object while scanning. The more frequently AI-based applications integrated into the programs of CBCT units involve positioning assistant, noise and artifacts reduction, structures identification and segmentation, airway analysis, and alignment of facial, intraoral, and CBCT scans. Some computer-aided static implant planning programs include patient's digital files, identification, labeling, and segmentation of anatomical structures, mandibular nerve tracing, automatic implant placement, and surgical implant guide design.
{"title":"An overview of artificial intelligence based applications for assisting digital data acquisition and implant planning procedures.","authors":"Marta Revilla-León, Miguel Gómez-Polo, Irena Sailer, John C Kois, Rata Rokhshad","doi":"10.1111/jerd.13249","DOIUrl":"https://doi.org/10.1111/jerd.13249","url":null,"abstract":"<p><strong>Objectives: </strong>To provide an overview of the current artificial intelligence (AI) based applications for assisting digital data acquisition and implant planning procedures.</p><p><strong>Overview: </strong>A review of the main AI-based applications integrated into digital data acquisitions technologies (facial scanners (FS), intraoral scanners (IOSs), cone beam computed tomography (CBCT) devices, and jaw trackers) and computer-aided static implant planning programs are provided.</p><p><strong>Conclusions: </strong>The main AI-based application integrated in some FS's programs involves the automatic alignment of facial and intraoral scans for virtual patient integration. The AI-based applications integrated into IOSs programs include scan cleaning, assist scanning, and automatic alignment between the implant scan body with its corresponding CAD object while scanning. The more frequently AI-based applications integrated into the programs of CBCT units involve positioning assistant, noise and artifacts reduction, structures identification and segmentation, airway analysis, and alignment of facial, intraoral, and CBCT scans. Some computer-aided static implant planning programs include patient's digital files, identification, labeling, and segmentation of anatomical structures, mandibular nerve tracing, automatic implant placement, and surgical implant guide design.</p>","PeriodicalId":15988,"journal":{"name":"Journal of Esthetic and Restorative Dentistry","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140957142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study aimed to develop the Turkish version of the Orofacial Esthetic Scale (OES-Tr) and to evaluate its psychometric properties.
Materials and Methods
The OES-Tr questionnaire was obtained from the English version of OES by translation and back-translation. The current version's psychometric properties were evaluated in a cohort of 221 participants (81 dental students, 70 dentists with 1–10 years of clinical experience, and 70 dentists with 11–20 years of clinical experience). To assess the test–retest reliability, the OES was administered twice to all participants, with a time interval of 2–4 weeks. The reliability and validity of the questionnaire were assessed. Also, in validity studies, OES total scores were correlated with Oral Health Impact Profile-Turkish Version (OHIP-Tr) total scores.
Results
The Cronbach's alpha value obtained from seven items was 0.866 in the examination performed on all individuals. Reliability results show that all questionnaire items are consistent within the test. Bartlett's test of sphericity was statistically significant (p < 0.05) and Kaiser–Meyer–Olkin test was 0.794. The results of the exploratory factor analysis indicated the creation of a single-factor structure. The examinations conducted on all participants revealed a statistically significant weak negative correlation between OES and OHIP scores (r = −0.144).
Conclusions
OES-Tr can be utilized as a reliable tool to evaluate an individual's perception of their orofacial appearance. With its excellent psychometric properties, it serves as a valuable instrument for assessing self-perceived orofacial esthetics.
Clinical Significance
OES-Tr is a valuable instrument for assessing the appearance of the orofacial region, with good psychometric properties.
研究目的本研究旨在开发土耳其版口面部美学量表（OES-Tr），并评估其心理测量特性：OES-Tr 问卷由英文版 OES 通过翻译和回译获得。在221名参与者（81名牙科学生、70名有1-10年临床经验的牙科医生和70名有11-20年临床经验的牙科医生）中对当前版本的心理测量特性进行了评估。为了评估重测信度，我们对所有参与者进行了两次重测，每次间隔 2-4 周。对问卷的可靠性和有效性进行了评估。此外，在有效性研究中，还将 OES 总分与土耳其版口腔健康影响档案（OHIP-Tr）总分进行了相关性分析：结果：在对所有人进行的检查中，七个项目的 Cronbach's alpha 值为 0.866。信度结果表明，所有问卷项目在测试中都是一致的。巴特利特的球形度检验具有统计学意义（p 结论：OES-Tr 可以作为一种有效的测试工具：OES-Tr 可以作为一种可靠的工具，用于评估个人对其口腔外观的感知。它具有良好的心理测量特性，是评估自我感觉口面部美学的重要工具：临床意义：OES-Tr 是评估口面部外观的重要工具，具有良好的心理测量特性。
{"title":"Development and psychometric properties of the Turkish version of the Orofacial Esthetic Scale","authors":"Isil Karaokutan PhD, DDS, MSc, Hande Senol PhD, Duygu Aksoy DDS, Ilayda Ayvaz DDS, Huriye Cifci DDS","doi":"10.1111/jerd.13263","DOIUrl":"10.1111/jerd.13263","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>This study aimed to develop the Turkish version of the Orofacial Esthetic Scale (OES-Tr) and to evaluate its psychometric properties.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>The OES-Tr questionnaire was obtained from the English version of OES by translation and back-translation. The current version's psychometric properties were evaluated in a cohort of 221 participants (81 dental students, 70 dentists with 1–10 years of clinical experience, and 70 dentists with 11–20 years of clinical experience). To assess the test–retest reliability, the OES was administered twice to all participants, with a time interval of 2–4 weeks. The reliability and validity of the questionnaire were assessed. Also, in validity studies, OES total scores were correlated with Oral Health Impact Profile-Turkish Version (OHIP-Tr) total scores.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>The Cronbach's alpha value obtained from seven items was 0.866 in the examination performed on all individuals. Reliability results show that all questionnaire items are consistent within the test. Bartlett's test of sphericity was statistically significant (<i>p</i> < 0.05) and Kaiser–Meyer–Olkin test was 0.794. The results of the exploratory factor analysis indicated the creation of a single-factor structure. The examinations conducted on all participants revealed a statistically significant weak negative correlation between OES and OHIP scores (<i>r</i> = −0.144).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>OES-Tr can be utilized as a reliable tool to evaluate an individual's perception of their orofacial appearance. With its excellent psychometric properties, it serves as a valuable instrument for assessing self-perceived orofacial esthetics.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Clinical Significance</h3>\u0000 \u0000 <p>OES-Tr is a valuable instrument for assessing the appearance of the orofacial region, with good psychometric properties.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15988,"journal":{"name":"Journal of Esthetic and Restorative Dentistry","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jerd.13263","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140945002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zeynep Sahin DDS, DClindent, Nazire Esra Ozer DDS, PhD, Tamer Akan DDS, PhD, Mehmet Ali Kılıcarslan DDS, PhD, Lale Karaagaclıoglu DDS, PhD
Objective
This study aimed to examine the shear bond strength (SBS) of repair material to conventionally, subtractive-, and additive-manufactured denture bases after different surface treatments.
Materials and Methods
Disk-shaped test specimens (N = 300) were prepared from denture base materials produced by one conventional (Procryla), one subtractive (Yamahachi), and one additive (Curo Denture) method. The test specimens were randomly divided into five groups (n = 10) and exposed to a variety of surface treatments—Group A: no surface treatment; Group B: grinding with silicon carbide paper; Group C: sandblasting; Group D: erbium: yttrium-aluminum-garnet laser; and Group E: plasma. Repair was performed with autopolymerizing acrylic resin (Meliodent). Surface roughness analyses were performed with a profilometer. Scanning electron microscopy was used to examine one specimen from each subgroup. SBS was evaluated on a universal testing machine. Failure types were observed under a stereomicroscope.
Results
Surface roughness values were significantly higher in all test materials in Group D than in the other groups (p < 0.001). For conventional resin, the SBS values were higher in Group C than in Groups A, D, and E (p < 0.001). For CAD/CAM material, Groups B and C had significantly greater SBS increases compared with Group E (p < 0.001). For 3D material, Group D showed higher SBS than all groups except Group C (p < 0.001).
Conclusions
For SBS, sandblasting was most effective in the conventional group, whereas laser treatment was the most effective in the additive-manufactured group. For the subtractive group, surface treatments other than plasma exhibited similar SBS.
Clinical Significance
In repairing fractured prostheses, any degree of roughening suitable for the material content may provide an SBS benefit.
{"title":"The impact of different surface treatments on repair bond strength of conventionally, subtractive-, and additive-manufactured denture bases","authors":"Zeynep Sahin DDS, DClindent, Nazire Esra Ozer DDS, PhD, Tamer Akan DDS, PhD, Mehmet Ali Kılıcarslan DDS, PhD, Lale Karaagaclıoglu DDS, PhD","doi":"10.1111/jerd.13248","DOIUrl":"10.1111/jerd.13248","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>This study aimed to examine the shear bond strength (SBS) of repair material to conventionally, subtractive-, and additive-manufactured denture bases after different surface treatments.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>Disk-shaped test specimens (<i>N</i> = 300) were prepared from denture base materials produced by one conventional (Procryla), one subtractive (Yamahachi), and one additive (Curo Denture) method. The test specimens were randomly divided into five groups (<i>n</i> = 10) and exposed to a variety of surface treatments—Group A: no surface treatment; Group B: grinding with silicon carbide paper; Group C: sandblasting; Group D: erbium: yttrium-aluminum-garnet laser; and Group E: plasma. Repair was performed with autopolymerizing acrylic resin (Meliodent). Surface roughness analyses were performed with a profilometer. Scanning electron microscopy was used to examine one specimen from each subgroup. SBS was evaluated on a universal testing machine. Failure types were observed under a stereomicroscope.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Surface roughness values were significantly higher in all test materials in Group D than in the other groups (<i>p</i> < 0.001). For conventional resin, the SBS values were higher in Group C than in Groups A, D, and E (<i>p</i> < 0.001). For CAD/CAM material, Groups B and C had significantly greater SBS increases compared with Group E (<i>p</i> < 0.001). For 3D material, Group D showed higher SBS than all groups except Group C (<i>p</i> < 0.001).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>For SBS, sandblasting was most effective in the conventional group, whereas laser treatment was the most effective in the additive-manufactured group. For the subtractive group, surface treatments other than plasma exhibited similar SBS.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Clinical Significance</h3>\u0000 \u0000 <p>In repairing fractured prostheses, any degree of roughening suitable for the material content may provide an SBS benefit.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15988,"journal":{"name":"Journal of Esthetic and Restorative Dentistry","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jerd.13248","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140922329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
<div> <section> <h3> Objectives</h3> <p>Esthetic crown lengthening (ECL) is commonly advocated to treat patients with altered passive eruption (APE). Since the introduction of the minimally invasive surgical concept, a limited number of studies have investigated this technique in a standardized manner, with further studies required to verify the validity and predictability of the minimally invasive FL-technique. The current randomized trial compares a minimally invasive (ECL), using piezosurgery with flapless-approach (FL), versus an open-flap (OF) approach in the management of patients with APE Type 1B.</p> </section> <section> <h3> Materials and Methods</h3> <p>Twenty-four patients diagnosed with APE Type 1B were randomly assigned into test (FL) with tunneling approach or control (OF) group with minimally invasive flap reflection (<i>n</i> = 12/group). Postoperative pain was assessed during the first 48 h. Gingival margin (GM) level relative to a custom-made stent (rGM) and patient satisfaction were assessed preoperative, immediately after surgery, at 3 and 6 months postsurgically. Postoperative swelling was reported for the first week postsurgically. Plaque index (PI), bleeding on probing (BoP), clinical attachment level (CAL), pocket depth (PD) and pink esthetic score (PES), were evaluated at baseline and 6 months. Linear regression analysis was conducted for pain.</p> </section> <section> <h3> Results</h3> <p>OF-group reported significantly higher pain and swelling scores than FL-group during the first 48 h (<i>p</i> < 0.05). FL-group showed no significant differences regarding rGM between 3 and 6 months, in contrast to OF-group, where a significant decrease in rGM was notable (<i>p</i> < 0.05). No significant differences in PI, BoP, CAL, PD, PES, and patient satisfaction scores were evident between groups (<i>p</i> > 0.05). Regression analysis demonstrated that treatment and gender were significant predictors for pain (<i>p</i> < 0.05).</p> </section> <section> <h3> Conclusions</h3> <p>Within the current study's limitations, piezo-surgical ECL with FL-approach presented significantly lower postoperative pain, swelling, and early GM stability compared to OF-approach.</p> </section> <section> <h3> Clinical Significance</h3> <p>Piezosurgical ECL with a FL-approach can be considered a predictable technique with advantages over the OF-approach in the management of patients with APE Type1B.</p> </section> </di
{"title":"Evaluation of minimally invasive esthetic crown lengthening using an open flap versus flapless surgical approach: A randomized controlled clinical trial","authors":"Marie-line Sourour BDS, Omnia Khaled Tawfik BDS, MSc, PhD, Manal Hosny BDS, MSc, PhD, Karim Mohamed Fawzy El-Sayed BDS, MSc, PhD, Dr. med. dent. habil.","doi":"10.1111/jerd.13247","DOIUrl":"10.1111/jerd.13247","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objectives</h3>\u0000 \u0000 <p>Esthetic crown lengthening (ECL) is commonly advocated to treat patients with altered passive eruption (APE). Since the introduction of the minimally invasive surgical concept, a limited number of studies have investigated this technique in a standardized manner, with further studies required to verify the validity and predictability of the minimally invasive FL-technique. The current randomized trial compares a minimally invasive (ECL), using piezosurgery with flapless-approach (FL), versus an open-flap (OF) approach in the management of patients with APE Type 1B.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>Twenty-four patients diagnosed with APE Type 1B were randomly assigned into test (FL) with tunneling approach or control (OF) group with minimally invasive flap reflection (<i>n</i> = 12/group). Postoperative pain was assessed during the first 48 h. Gingival margin (GM) level relative to a custom-made stent (rGM) and patient satisfaction were assessed preoperative, immediately after surgery, at 3 and 6 months postsurgically. Postoperative swelling was reported for the first week postsurgically. Plaque index (PI), bleeding on probing (BoP), clinical attachment level (CAL), pocket depth (PD) and pink esthetic score (PES), were evaluated at baseline and 6 months. Linear regression analysis was conducted for pain.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>OF-group reported significantly higher pain and swelling scores than FL-group during the first 48 h (<i>p</i> < 0.05). FL-group showed no significant differences regarding rGM between 3 and 6 months, in contrast to OF-group, where a significant decrease in rGM was notable (<i>p</i> < 0.05). No significant differences in PI, BoP, CAL, PD, PES, and patient satisfaction scores were evident between groups (<i>p</i> > 0.05). Regression analysis demonstrated that treatment and gender were significant predictors for pain (<i>p</i> < 0.05).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>Within the current study's limitations, piezo-surgical ECL with FL-approach presented significantly lower postoperative pain, swelling, and early GM stability compared to OF-approach.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Clinical Significance</h3>\u0000 \u0000 <p>Piezosurgical ECL with a FL-approach can be considered a predictable technique with advantages over the OF-approach in the management of patients with APE Type1B.</p>\u0000 </section>\u0000 </di","PeriodicalId":15988,"journal":{"name":"Journal of Esthetic and Restorative Dentistry","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jerd.13247","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140922306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Awab Abdulmajeed DDS, MS, Taiseer A. Sulaiman DDS, PhD, Abdulhaq A. Suliman BDS, MS, MS, PhD, Aous A. Abdulmajeed DDS, PhD, Timo O. Närhi DDS, PhD
Statement of Problem
Limited evidence is available for the effect of chairside adjustment using rotary cutting instruments on the surface roughness and optical properties of different zirconia types.
Purpose
To evaluate the effect of simulated adjustments on surface roughness and optical properties of different zirconia types.
Materials and Methods
Three Partially Stabilized Zirconia (PSZ) types based on mole percent yttria (Y) concentration from the same manufacturer (Katana; Kuraray) were used: 3Y-PSZ, 4Y-PSZ, and 5Y-PSZ. Thirty disk-shaped specimens (Ø14 × 1.2 mm) from different zirconia types (N = 90) were prepared. Specimens were either left without adjustment (NA), adjusted with Dialite ZR finishing and polishing system (Brasseler) (APol), or adjusted with course diamond instruments only (ADia). The specimens were distributed into 9 groups (n = 10): Group 3Y-PSZ/NA, Group 3Y-PSZ/APol, Group 3Y-PSZ/ADia, Group 4Y-PSZ/NA, Group 4Y-PSZ/APol, Group 4Y-PSZ/ADia, Group 5Y-PSZ/NA, Group 5Y-PSZ/APol, and Group 5Y-PSZ/ADia. The surface roughness of specimen was analyzed using an Atomic Force Microscope (AFM) (Bruker's Dimension Icon, Bruker) and Root Means Square (RMS) were recorded (nm). Surface Gloss (SG), Translucency Parameter (TP), and Contrast Ratio (CR) values of all groups were recorded using an integrating sphere spectrophotometer. Statistical analysis was performed using analysis of variance (ANOVA) and Tukey's multiple comparison tests for pairwise comparisons at p < 0.05 and 95% confidence interval.
Results
APol had no effect on the surface roughness (p = 0.88) while ADia had a significant negative effect (p < 0.05) despite the type of zirconia. Out of the three testes optical properties, only SG was negatively affected by ADia for all types of zirconia (p < 0.05). The two adjustment types did not affect the TP of all the tested zirconia (p = 0.91). The CR was not affected by the tested adjustments for all zirconia types (p = 0.726).
Conclusion
Proper zirconia adjustment following a sequence of burs and polishers can maintain acceptable roughness and optical properties. Adjustment of zirconia with rough diamond can lead to deleterious effects and should be avoided.
{"title":"Surface roughness and optical characteristics evaluations after chairside adjustment of different zirconia types","authors":"Awab Abdulmajeed DDS, MS, Taiseer A. Sulaiman DDS, PhD, Abdulhaq A. Suliman BDS, MS, MS, PhD, Aous A. Abdulmajeed DDS, PhD, Timo O. Närhi DDS, PhD","doi":"10.1111/jerd.13246","DOIUrl":"10.1111/jerd.13246","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Statement of Problem</h3>\u0000 \u0000 <p>Limited evidence is available for the effect of chairside adjustment using rotary cutting instruments on the surface roughness and optical properties of different zirconia types.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Purpose</h3>\u0000 \u0000 <p>To evaluate the effect of simulated adjustments on surface roughness and optical properties of different zirconia types.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>Three Partially Stabilized Zirconia (PSZ) types based on mole percent yttria (Y) concentration from the same manufacturer (Katana; Kuraray) were used: 3Y-PSZ, 4Y-PSZ, and 5Y-PSZ. Thirty disk-shaped specimens (Ø14 × 1.2 mm) from different zirconia types (<i>N</i> = 90) were prepared. Specimens were either left without adjustment (NA), adjusted with Dialite ZR finishing and polishing system (Brasseler) (APol), or adjusted with course diamond instruments only (ADia). The specimens were distributed into 9 groups (<i>n</i> = 10): Group 3Y-PSZ/NA, Group 3Y-PSZ/APol, Group 3Y-PSZ/ADia, Group 4Y-PSZ/NA, Group 4Y-PSZ/APol, Group 4Y-PSZ/ADia, Group 5Y-PSZ/NA, Group 5Y-PSZ/APol, and Group 5Y-PSZ/ADia. The surface roughness of specimen was analyzed using an Atomic Force Microscope (AFM) (Bruker's Dimension Icon, Bruker) and Root Means Square (RMS) were recorded (nm). Surface Gloss (SG), Translucency Parameter (TP), and Contrast Ratio (CR) values of all groups were recorded using an integrating sphere spectrophotometer. Statistical analysis was performed using analysis of variance (ANOVA) and Tukey's multiple comparison tests for pairwise comparisons at <i>p</i> < 0.05 and 95% confidence interval.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>APol had no effect on the surface roughness (<i>p</i> = 0.88) while ADia had a significant negative effect (<i>p</i> < 0.05) despite the type of zirconia. Out of the three testes optical properties, only SG was negatively affected by ADia for all types of zirconia (<i>p</i> < 0.05). The two adjustment types did not affect the TP of all the tested zirconia (<i>p</i> = 0.91). The CR was not affected by the tested adjustments for all zirconia types (<i>p</i> = 0.726).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Proper zirconia adjustment following a sequence of burs and polishers can maintain acceptable roughness and optical properties. Adjustment of zirconia with rough diamond can lead to deleterious effects and should be avoided.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Clinical Significance</h3>\u0000 \u0000 ","PeriodicalId":15988,"journal":{"name":"Journal of Esthetic and Restorative Dentistry","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140876627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Andre Weissheimer DDS, MS, PhD, John Pham DDS, MS, Hongsheng Tong DDS, PhD, Sercan Akyalcin DDS, MS, PhD
Background
Contemporary fixed orthodontic appliances are shifting from non-customized pre-adjusted appliances to custom-designed and printed appliances with novel digital setup systems. We are one step closer to precision dentistry and orthodontics using personalized mechanics and custom appliances. However, despite the evidential enhancement and other improvements to fixed appliances, tooth movement is still limited to five degrees of freedom. Opening or closing spaces still requires manually placing elastomeric chains or coil springs.
Aim
In this article, we aimed to demonstrate how advancements in CAD/CAM technology, reverse engineering, and digital customization are helping orthodontics constantly evolve, enabling treatment with enhanced esthetics and minimal compliance. The clinical system (InBrace®, Irvine, CA) described in this article uses a patient-specific, digitally designed multiloop NITI wire that delivers friction-free, light, and continuous forces and activates automatically whenever the malocclusion deviates from the digital setup.
Conclusion
Through digital customization, InBrace allows for automated tooth movement in all six degrees of freedom, including space opening or closure, via programmed non-sliding mechanics.
Clinical Significance
Precision orthodontics and personalized treatment have been significant developments in orthodontics recently. This article focuses on how a technologically advanced lingual appliance system could achieve targeted cosmetic results methodically via automation and personalization.
背景：当代固定矫治器正从非定制的预调整矫治器转变为定制设计和打印的矫治器，并配备了新颖的数字设置系统。我们离使用个性化力学和定制矫治器的精准牙科和正畸更近了一步。然而，尽管固定矫治器的证据增强和其他方面有所改进，但牙齿移动仍然仅限于五个自由度。目的：在本文中，我们旨在展示 CAD/CAM 技术、逆向工程和数字定制技术的进步是如何帮助正畸学不断发展的，从而实现美学效果更佳、顺应性最小的治疗。本文介绍的临床系统（InBrace®，加利福尼亚州欧文市）采用了患者专用的数字化设计的多环 NITI 线，可提供无摩擦、轻巧、持续的力，并在错合畸形偏离数字设置时自动激活：结论：通过数字化定制，InBrace 可在所有六个自由度内自动移动牙齿，包括通过编程的非滑动力学打开或关闭间隙：精确正畸和个性化治疗是近来正畸学的重要发展。本文重点介绍了技术先进的舌侧矫治器系统如何通过自动化和个性化方法实现有针对性的美容效果。
{"title":"Esthetic outcomes in orthodontics through digital customization with a lingual appliance system","authors":"Andre Weissheimer DDS, MS, PhD, John Pham DDS, MS, Hongsheng Tong DDS, PhD, Sercan Akyalcin DDS, MS, PhD","doi":"10.1111/jerd.13244","DOIUrl":"10.1111/jerd.13244","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Background</h3>\u0000 \u0000 <p>Contemporary fixed orthodontic appliances are shifting from non-customized pre-adjusted appliances to custom-designed and printed appliances with novel digital setup systems. We are one step closer to precision dentistry and orthodontics using personalized mechanics and custom appliances. However, despite the evidential enhancement and other improvements to fixed appliances, tooth movement is still limited to five degrees of freedom. Opening or closing spaces still requires manually placing elastomeric chains or coil springs.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Aim</h3>\u0000 \u0000 <p>In this article, we aimed to demonstrate how advancements in CAD/CAM technology, reverse engineering, and digital customization are helping orthodontics constantly evolve, enabling treatment with enhanced esthetics and minimal compliance. The clinical system (InBrace®, Irvine, CA) described in this article uses a patient-specific, digitally designed multiloop NITI wire that delivers friction-free, light, and continuous forces and activates automatically whenever the malocclusion deviates from the digital setup.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Through digital customization, InBrace allows for automated tooth movement in all six degrees of freedom, including space opening or closure, via programmed non-sliding mechanics.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Clinical Significance</h3>\u0000 \u0000 <p>Precision orthodontics and personalized treatment have been significant developments in orthodontics recently. This article focuses on how a technologically advanced lingual appliance system could achieve targeted cosmetic results methodically via automation and personalization.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15988,"journal":{"name":"Journal of Esthetic and Restorative Dentistry","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140876626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Panagiotis Ntovas DDS, MS, Sofia Diamantopoulou DDS, MS, PhD, William Michael Johnston PhD, Efstratios Papazoglou DDS, MS, PhD
Objectives
The aim of this study was to assess the lightness difference perceptibility and acceptability thresholds, for a single maxillary central incisor, and to investigate possible differences in these thresholds regarding the direction (+ΔL* vs. −ΔL*), the observer group (dentists vs. laypersons), and the gender and age of the observers.
Materials and Methods
A series of images with varying lightness (L*), were created by altering the right maxillary central incisor of a male Caucasian, on a frontal view full-portrait image. Digital modification of one central incisor by 1 ΔL* unit resulted in 15 different images: one control, seven with increased and seven with decreased lightness. The images were presented in random order, on a digitally calibrated monitor, to 158 observers, grouped into 79 dentists, and 79 laypersons, who were asked to evaluate every image and answer whether they perceive a difference and if yes, whether they accept this difference. A multifactorial analysis of covariance was performed to analyze the perception and acceptance of any difference in the central incisors and to estimate the thresholds. The statistical significance level was α = 0.05.
Results
Overall, the magnitude of ΔL*, direction of ΔL*, observer group and age were each significant (p < 0.001), as was gender (p = 0.03). The effect of the magnitude of ΔL* interacted with its direction and the observer group (p = 0.045), and the effect of age interacted with the direction of ΔL*, and the gender and the group of the observers. Estimated 50%:50% perceptibility thresholds ranged from 0.1 to 2.7, and 50%:50% acceptability thresholds ranged from 2.3 to 4.5. Overall, dentists perceived lightness differences at lower magnitudes than laypersons; difference in lightness was perceived and accepted at lower magnitudes when the tooth become lighter instead of darker; and female observers perceived and accepted lightness differences at lower magnitudes compared to males. As age increased overall, differences of lightness were perceived and accepted at higher magnitudes.
Conclusions
Perceptibility and acceptability of lightness differences of a single maxillary central incisor are affected by the magnitude and the direction of lightness change, as well as the gender, the age, and the type of the observers.
{"title":"Perceptibility and acceptability of lightness difference of a single maxillary central incisor","authors":"Panagiotis Ntovas DDS, MS, Sofia Diamantopoulou DDS, MS, PhD, William Michael Johnston PhD, Efstratios Papazoglou DDS, MS, PhD","doi":"10.1111/jerd.13245","DOIUrl":"10.1111/jerd.13245","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objectives</h3>\u0000 \u0000 <p>The aim of this study was to assess the lightness difference perceptibility and acceptability thresholds, for a single maxillary central incisor, and to investigate possible differences in these thresholds regarding the direction (+Δ<i>L</i>* vs. −Δ<i>L</i>*), the observer group (dentists vs. laypersons), and the gender and age of the observers.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>A series of images with varying lightness (<i>L</i>*), were created by altering the right maxillary central incisor of a male Caucasian, on a frontal view full-portrait image. Digital modification of one central incisor by 1 Δ<i>L</i>* unit resulted in 15 different images: one control, seven with increased and seven with decreased lightness. The images were presented in random order, on a digitally calibrated monitor, to 158 observers, grouped into 79 dentists, and 79 laypersons, who were asked to evaluate every image and answer whether they perceive a difference and if yes, whether they accept this difference. A multifactorial analysis of covariance was performed to analyze the perception and acceptance of any difference in the central incisors and to estimate the thresholds. The statistical significance level was <i>α</i> = 0.05.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Overall, the magnitude of Δ<i>L</i>*, direction of Δ<i>L</i>*, observer group and age were each significant (<i>p</i> < 0.001), as was gender (<i>p</i> = 0.03). The effect of the magnitude of Δ<i>L</i>* interacted with its direction and the observer group (<i>p</i> = 0.045), and the effect of age interacted with the direction of Δ<i>L</i>*, and the gender and the group of the observers. Estimated 50%:50% perceptibility thresholds ranged from 0.1 to 2.7, and 50%:50% acceptability thresholds ranged from 2.3 to 4.5. Overall, dentists perceived lightness differences at lower magnitudes than laypersons; difference in lightness was perceived and accepted at lower magnitudes when the tooth become lighter instead of darker; and female observers perceived and accepted lightness differences at lower magnitudes compared to males. As age increased overall, differences of lightness were perceived and accepted at higher magnitudes.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>Perceptibility and acceptability of lightness differences of a single maxillary central incisor are affected by the magnitude and the direction of lightness change, as well as the gender, the age, and the type of the observers.</p>\u0000 </section>\u0000 \u0000","PeriodicalId":15988,"journal":{"name":"Journal of Esthetic and Restorative Dentistry","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jerd.13245","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140856128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gaetano Paolone DDS, PhD, Sofia Baldani BDS, Niccolò De Masi BDS, Mauro Mandurino BDS, Giacomo Collivasone DDS, Nicola Scotti DDS, PhD, Enrico Gherlone MD, DDS, Giuseppe Cantatore MD, DDS
Objectives
To conduct a systematic review on the translucency of bulk-fill (BF) composite materials, evaluating the factors influencing it and its clinical implications.
Materials and Methods
A systematic search was performed on four databases (Embase, Medline/PubMed, Scopus, and Web of Science) for articles published until October 2, 2023. Search terms were: “translucency,” “translucency parameter,” “contrast,” “contrast ratio,” “bulk,” “bulk-fill,” “bulk fill,” “composite,” “resin,” “resin based,” “resin-based,” “restoration,” and “dental.” In vitro studies, written in English language, investigating BF resin-based composites translucency were included. The risk of bias was performed with the RoBDEMAT tool.
Results
Of 590 screened articles, 13 were included in this review. They investigated 11 high-viscosity BF and 5 low viscosity ones. The limited number of the identified studies and the heterogeneity of the extracted data did not allow to conduct a meta-analysis.
Conclusions
BF materials exhibit variability in translucency due to variations in experimental designs and the heterogeneous composition.
Clinical Significance
BFs may behave differently in masking the substrate or in blending capacity.
{"title":"Translucency of bulk-fill composite materials: A systematic review","authors":"Gaetano Paolone DDS, PhD, Sofia Baldani BDS, Niccolò De Masi BDS, Mauro Mandurino BDS, Giacomo Collivasone DDS, Nicola Scotti DDS, PhD, Enrico Gherlone MD, DDS, Giuseppe Cantatore MD, DDS","doi":"10.1111/jerd.13241","DOIUrl":"10.1111/jerd.13241","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objectives</h3>\u0000 \u0000 <p>To conduct a systematic review on the translucency of bulk-fill (BF) composite materials, evaluating the factors influencing it and its clinical implications.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>A systematic search was performed on four databases (Embase, Medline/PubMed, Scopus, and Web of Science) for articles published until October 2, 2023. Search terms were: “translucency,” “translucency parameter,” “contrast,” “contrast ratio,” “bulk,” “bulk-fill,” “bulk fill,” “composite,” “resin,” “resin based,” “resin-based,” “restoration,” and “dental.” In vitro studies, written in English language, investigating BF resin-based composites translucency were included. The risk of bias was performed with the RoBDEMAT tool.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Of 590 screened articles, 13 were included in this review. They investigated 11 high-viscosity BF and 5 low viscosity ones. The limited number of the identified studies and the heterogeneity of the extracted data did not allow to conduct a meta-analysis.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>BF materials exhibit variability in translucency due to variations in experimental designs and the heterogeneous composition.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Clinical Significance</h3>\u0000 \u0000 <p>BFs may behave differently in masking the substrate or in blending capacity.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15988,"journal":{"name":"Journal of Esthetic and Restorative Dentistry","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140827421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sreeprada Dash MDS, Gunjan Srivastava MDS, Subrat Kumar Padhiary MDS, Monika Samal MDS, Gülce Çakmak DDS, PhD, Andrea Roccuzzo PhD, Pedro Molinero-Mourelle Dr. med. dent, PhD
Objectives
To validate the reproducibility and inter/intra-observer variability of the Pink Esthetic Score/White Esthetic Score (PES/WES) of single tooth-supported prostheses in the maxillary esthetic zone (13–23).
Materials and Methods
Forty-five patients were randomly assigned to one of the three treatment options (15 patients per group) receiving each one a different crown type: Porcelain fused to metal (PFM), monolithic zirconia, and lithium disilicate. Eight observers from each of four different specialties (Prosthodontists, Orthodontists, Periodontists, and Oral Surgeons) were recruited and assessed twice and four weeks apart (i.e., T1 and T2) 45 photographs of the single tooth-supported prosthesis using PES/WES and compared them with contralateral teeth.
Results
According to the ANOVA and post hoc tests, the zirconia crown type obtained the highest mean score by all observers, with a mean value of 16.70 ± 2.94. The prosthodontists and oral surgeons assigned the lowest mean score to PFM crowns, 13.03 ± 3.47 and 13.80 ± 3.17, respectively. Notably, the prosthodontists awarded the highest scores, specifically 17.50 ± 2.81 for the zirconia crowns. Intraobserver agreement was calculated utilizing the paired t-test. Pairwise comparisons between observers of different specialties revealed significant intraobserver agreement. Interclass correlation coefficient (ICC) scores were statistically significant among four specialties. No difference was detected concerning the interobserver agreement.
Conclusions
The PES/WES index remains consistent across various observers from different specializations, yielding uniform results in the overall esthetic evaluation. Consequently, in light of the presented preliminary positive results, its use might also be considered for the esthetic assessment of single-tooth-supported prostheses.
Clinical Significance
The PES/WES index may be employed clinically to evaluate single tooth-supported prostheses as it emerged as a reproducible esthetic scoring system.
{"title":"Validation of the pink esthetic score/white esthetic score at single tooth-supported prostheses in the esthetic zone: A randomized clinical trial","authors":"Sreeprada Dash MDS, Gunjan Srivastava MDS, Subrat Kumar Padhiary MDS, Monika Samal MDS, Gülce Çakmak DDS, PhD, Andrea Roccuzzo PhD, Pedro Molinero-Mourelle Dr. med. dent, PhD","doi":"10.1111/jerd.13243","DOIUrl":"10.1111/jerd.13243","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objectives</h3>\u0000 \u0000 <p>To validate the reproducibility and inter/intra-observer variability of the Pink Esthetic Score/White Esthetic Score (PES/WES) of single tooth-supported prostheses in the maxillary esthetic zone (13–23).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>Forty-five patients were randomly assigned to one of the three treatment options (15 patients per group) receiving each one a different crown type: Porcelain fused to metal (PFM), monolithic zirconia, and lithium disilicate. Eight observers from each of four different specialties (Prosthodontists, Orthodontists, Periodontists, and Oral Surgeons) were recruited and assessed twice and four weeks apart (i.e., T1 and T2) 45 photographs of the single tooth-supported prosthesis using PES/WES and compared them with contralateral teeth.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>According to the ANOVA and post hoc tests, the zirconia crown type obtained the highest mean score by all observers, with a mean value of 16.70 ± 2.94. The prosthodontists and oral surgeons assigned the lowest mean score to PFM crowns, 13.03 ± 3.47 and 13.80 ± 3.17, respectively. Notably, the prosthodontists awarded the highest scores, specifically 17.50 ± 2.81 for the zirconia crowns. Intraobserver agreement was calculated utilizing the paired <i>t</i>-test. Pairwise comparisons between observers of different specialties revealed significant intraobserver agreement. Interclass correlation coefficient (ICC) scores were statistically significant among four specialties. No difference was detected concerning the interobserver agreement.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>The PES/WES index remains consistent across various observers from different specializations, yielding uniform results in the overall esthetic evaluation. Consequently, in light of the presented preliminary positive results, its use might also be considered for the esthetic assessment of single-tooth-supported prostheses.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Clinical Significance</h3>\u0000 \u0000 <p>The PES/WES index may be employed clinically to evaluate single tooth-supported prostheses as it emerged as a reproducible esthetic scoring system.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15988,"journal":{"name":"Journal of Esthetic and Restorative Dentistry","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140827385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Joao Pedro Justino de Oliveira Limirio DDS, MS, PhD, Jéssica Marcela de Luna Gomes DDS, MS, PhD, Joel Ferreira Santiago-Junior DDS, MS, PhD, Bruna Egumi Nagay DDS, MS, Aldiéris Alves Pesqueira DDS, MS, PhD, Wirley Gonçalves Assunção DDS, MS, PhD, Maria Cristina Rosifini Alves-Rezende DDS, MS, PhD, Eduardo Piza Pellizzer DDS, MS, PhD
Objectives
This study aimed to assess the influence of translucent monolithic versus bilayered crowns and whether the use of a CoCr base abutments affects the fatigue and fracture resistance of screwed implant-supported single crowns with external connections under mechanical cycling.
Materials and Methods
Fifty specimens were divided into groups: (1) metal–ceramic (MC) crown, (2) veneered zirconia crown (Zr), (3) veneered zirconia crown with a CoCr base abutment (ZrB), (4) monolithic translucent zirconia crown (MZr), and (5) monolithic translucent zirconia crown with a CoCr base abutment (MZrB). Specimens underwent mechanical cycling (5 × 106 cycles; 150 N) evaluating fatigue resistance (number of failures) and those that failed were subsequently subjected to fractographic analyses (stereomicroscope and scanning electron microscope) to evaluate failure location and area, and maximum fracture load was also measured.
Results
The failure-related survival rate (100%) and maximum fracture resistance of the MZrB were significantly higher than those of MC and Zr (50%; p < 0.05). There were no significant differences in the failure rate and fracture resistance when a CoCr base abutment was used or not in the translucent monolithic Zr groups (p > 0.05;MZrB vs. MZr). Failure location, with MC crowns' fractures, noted at the screw area (p = 0.043), while all-ceramic crowns were mostly in the cuspid and to failure area, the Zr group had the largest mean (15.55 ± 9.17 mm2) among the groups, significant difference only when compared with MC (1.62 ± 0.81 mm2) (p = 0.025).
Conclusions
Translucent monolithic zirconia crowns exhibited significantly higher fatigue and fracture resistance compared with conventional MC and bilayered crowns.
Clinical Significance
The appropriate choice of material and manufacturing technique is crucial for predicting the higher clinical performance of single crowns. Enhanced mechanical resistance in terms of fatigue and fracture resistance can be achieved by replacing MC and bilayered restorations with computer-aided design and computer-aided manufacturing monolithic zirconia.
{"title":"Influence of ceramic crown design (translucent monolithic zirconia vs. bilayered) of implant-supported single crowns after mechanical cycling","authors":"Joao Pedro Justino de Oliveira Limirio DDS, MS, PhD, Jéssica Marcela de Luna Gomes DDS, MS, PhD, Joel Ferreira Santiago-Junior DDS, MS, PhD, Bruna Egumi Nagay DDS, MS, Aldiéris Alves Pesqueira DDS, MS, PhD, Wirley Gonçalves Assunção DDS, MS, PhD, Maria Cristina Rosifini Alves-Rezende DDS, MS, PhD, Eduardo Piza Pellizzer DDS, MS, PhD","doi":"10.1111/jerd.13237","DOIUrl":"10.1111/jerd.13237","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objectives</h3>\u0000 \u0000 <p>This study aimed to assess the influence of translucent monolithic versus bilayered crowns and whether the use of a CoCr base abutments affects the fatigue and fracture resistance of screwed implant-supported single crowns with external connections under mechanical cycling.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>Fifty specimens were divided into groups: (1) metal–ceramic (MC) crown, (2) veneered zirconia crown (Zr), (3) veneered zirconia crown with a CoCr base abutment (ZrB), (4) monolithic translucent zirconia crown (MZr), and (5) monolithic translucent zirconia crown with a CoCr base abutment (MZrB). Specimens underwent mechanical cycling (5 × 10<sup>6</sup> cycles; 150 N) evaluating fatigue resistance (number of failures) and those that failed were subsequently subjected to fractographic analyses (stereomicroscope and scanning electron microscope) to evaluate failure location and area, and maximum fracture load was also measured.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>The failure-related survival rate (100%) and maximum fracture resistance of the MZrB were significantly higher than those of MC and Zr (50%; <i>p</i> < 0.05). There were no significant differences in the failure rate and fracture resistance when a CoCr base abutment was used or not in the translucent monolithic Zr groups (<i>p</i> > 0.05;MZrB vs. MZr). Failure location, with MC crowns' fractures, noted at the screw area (<i>p</i> = 0.043), while all-ceramic crowns were mostly in the cuspid and to failure area, the Zr group had the largest mean (15.55 ± 9.17 mm<sup>2</sup>) among the groups, significant difference only when compared with MC (1.62 ± 0.81 mm<sup>2</sup>) (<i>p</i> = 0.025).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>Translucent monolithic zirconia crowns exhibited significantly higher fatigue and fracture resistance compared with conventional MC and bilayered crowns.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Clinical Significance</h3>\u0000 \u0000 <p>The appropriate choice of material and manufacturing technique is crucial for predicting the higher clinical performance of single crowns. Enhanced mechanical resistance in terms of fatigue and fracture resistance can be achieved by replacing MC and bilayered restorations with computer-aided design and computer-aided manufacturing monolithic zirconia.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15988,"journal":{"name":"Journal of Esthetic and Restorative Dentistry","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140799438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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