Journal of Prosthetic Dentistry最新文献

{"title":"Palatal coverage and oral stereognosis: A systematic review and meta-analysis","authors":"","doi":"10.1016/j.prosdent.2022.09.009","DOIUrl":"10.1016/j.prosdent.2022.09.009","url":null,"abstract":"<div><h3>Statement of problem</h3><p>Complete denture wearers present with less sensory function than dentate individuals because of the loss of periodontal receptors. However, the role of the palatal receptors on such function is still unclear.</p></div><div><h3>Purpose</h3><p>The purpose of this systematic review and meta-analysis was to evaluate the influence of palatal coverage associated with complete dentures or palatal devices on oral stereognosis in edentulous or dentate adults.</p></div><div><h3>Material and methods</h3><p>Eight major literature databases and the nonpeer-reviewed literature were searched up to December of 2021. Randomized clinical trials and nonrandomized clinical trials comparing oral stereognosis in edentulous or dentate participants using conventional complete dentures or implant-supported prostheses or those using palatal devices were included. Bias was assessed with Cochrane tools (ROBINS-I and RoB 2.0). Meta-analyses were conducted to compare oral stereognosis before and after palatal coverage (α=.05). Certainty of the evidence was verified using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) approach.</p></div><div><h3>Results</h3><p>Of 14 included studies, the risk of bias was considered low for 9 studies and moderate for 5 studies. Despite the very low certainty of evidence, meta-analyses showed no differences in oral stereognosis immediately after complete denture insertion (standardized mean difference [SMD]=0.302; 95% confidence interval [CI]: −0.124, 0.728; <em>P</em>=.165; I²=92.4%). Oral stereognosis scores improved after ≥1 month of complete denture use compared with initial evaluations without them. Qualitative analysis indicated that oral stereognosis was not influenced by palatal coverage shortly after complete denture installation and that oral stereognosis scores improved over time after prosthesis use.</p></div><div><h3>Conclusions</h3><p>Oral stereognosis improved with the use of palate-covering prostheses over time. However, because of the very low certainty of evidence, the statement must be interpreted with caution.</p></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022391322006126/pdfft?md5=fd773e8f777623612e323087897a0408&pid=1-s2.0-S0022391322006126-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40446272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Does the incorporation of zinc into TiO2 on titanium surfaces increase bactericidal activity? A systematic review and meta-analysis","authors":"","doi":"10.1016/j.prosdent.2022.05.007","DOIUrl":"10.1016/j.prosdent.2022.05.007","url":null,"abstract":"<div><h3>Statement of problem</h3><p>Infections associated with bacterial biofilm formation are an important cause of early implant failure. With the growing number of antibiotic-resistant bacteria, the incorporation of zinc into TiO₂ coatings of titanium implants has emerged to promote osseointegration and inhibit bacterial proliferation. However, a systematic assessment of its efficacy is lacking.</p></div><div><h3>Purpose</h3><p>The purpose of this systematic review and meta-analysis was to assess the bactericidal effect of zinc-modified TiO₂ coatings on titanium or Ti-6Al-4V alloy.</p></div><div><h3>Material and methods</h3><p>The review was structured based on the preferred reporting items for systematic reviews and meta-analyses (PRISMA) checklist and the peer review of electronic search strategies (PRESS) guidelines. The search was performed in Science Direct, SCOPUS, Web of Science, and PubMed databases, including experimental in vitro studies that used titanium or Ti-6Al-4V as a control group and performed bacterial assays. Meta-analysis was performed by using the standardized mean differences of antibacterial effects.</p></div><div><h3>Results</h3><p>A total of 2519 articles were collected after duplicate removal. Then, eligibility criteria and a manual search were applied to select 20 studies for qualitative analysis and 16 studies for statistical analysis. The risk of bias revealed low-quality evidence. The meta-analysis showed that zinc positively affected the bactericidal activity of TiO₂ coatings (−8.79, CI_95%=−11.01 to −6.57, <em>P</em>&lt;.001), with a high degree of heterogeneity (I²=78%). Subgroup analysis with TiO₂ nanotubes produced by anodization and ZnO nanoparticles by hydrothermal synthesis reduced heterogeneity to 43%, with the removal of outliers (I²=46%), with a favorable antibacterial effect for zinc incorporation into TiO₂.</p></div><div><h3>Conclusions</h3><p>Bactericidal activity was identified for zinc incorporated into TiO₂ coatings, making it an interesting option for titanium dental implants.</p></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022391322003286/pdfft?md5=0ed79b6d83a71022c6ce12c8cb1a4043&pid=1-s2.0-S0022391322003286-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40561929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing color mismatch in single-shade composite resins for enamel replacement","authors":"","doi":"10.1016/j.prosdent.2024.06.009","DOIUrl":"10.1016/j.prosdent.2024.06.009","url":null,"abstract":"<div><h3>Statement of problem</h3><p>Shade selection is a challenge in restorative dentistry. While single-shade composite resins may simplify this process, whether the color mismatch between this composite resin and the substrate is within acceptable levels to ensure successful outcomes is unclear.</p></div><div><h3>Purpose</h3><p>The purpose of this in vitro study was to assess the influence of background and surrounding shade, thickness, and proximity to the surrounding on color mismatch when shaded and single-shade composite resins are used in the center of an enamel layer.</p></div><div><h3>Material and methods</h3><p>Two-layer specimens mimicking dentin (the background) and enamel (the surrounding and center) were prepared. Two shades were used for the background and the surrounding layer (OA1/A1 and OA3/A3). At the Ø3-mm center, 2 single-shade composite resins were placed, Omnichroma (OM) and Admira Fusion x-tra (FU), and also shaded composite resins A1, WE, A3, and C2. For the OA1/A1 background and surrounding, shades A1 and WE served as positive controls, while the A3 and C2 were negative controls. For OA3/A3, these controls were reversed. Two enamel layer thicknesses were evaluated (0.5- and 1.0-mm). Reflectance measurements were made at 0.0, 1.0, 2.0, and 2.5 mm from the center. Color differences were calculated between those at 2.5 mm and at other distances (ΔE_0, ΔE_1, and ΔE₂). Data analysis employed a 4-way repeated measure ANOVA with Bonferroni corrections for the pair-wise comparisons (α=.05).</p></div><div><h3>Results</h3><p>Background and surrounding shade, central shade, distance, and thickness affected color mismatch (<em>P</em>&lt;.05). For the OA1/A1 specimens, single-shade color mismatch values were found between both the positive and negative controls (<em>P</em>&lt;.05). For the OA3/A3 specimens, the color mismatch did not differ significantly from that of negative controls (<em>P</em>&gt;.05). No difference was found between ΔE₀ and ΔE₁, but each was distinct from ΔE₂. Thickness did not affect the color mismatch of the single-shade composite resins (<em>P</em>&lt;.05).</p></div><div><h3>Conclusions</h3><p>Single-shade composite resins for enamel replacement showed higher color mismatches compared with positive controls.</p></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022391324004281/pdfft?md5=7bd7065464d9c8de5f4aec5b78ed66fa&pid=1-s2.0-S0022391324004281-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141544960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of gingival color on the color differences of dental laminate veneers","authors":"","doi":"10.1016/j.prosdent.2024.06.003","DOIUrl":"10.1016/j.prosdent.2024.06.003","url":null,"abstract":"<div><h3>Statement of problem</h3><p>The effect of various gingival colors on the color differences of laminate veneers is unclear and comparative evaluations should be documented.</p></div><div><h3>Purpose</h3><p>The purpose of this in vitro study was to investigate the influence of different gingival colors on the color differences of laminate veneers.</p></div><div><h3>Material and methods</h3><p><span>Five maxillary typodonts were used to obtain study models using 5 different gingival colors: light pink (LP), dark pink (DP), orange (Or), brown (Br), and violet (V). A total of 45 laminate veneers were milled using A1-shaded lithium disilicate ceramic and cemented on natural tooth-colored substrates. Color parameters were assessed using a spectroradiometer at 3 measurement areas (cervical third, mid-third, and incisal third) along the midline of laminate veneer with a focus measuring diameter of 1 mm. Color differences (∆E*</span>_ab and ∆E₀₀) were calculated and compared with perceptibility (PT: ∆E*_ab=1.22, ΔE₀₀=0.81) and acceptability (AT: ∆E*_ab=2.66, ΔE₀₀<span>=1.77) visual thresholds. Color variation data were statistically analyzed using 2-way ANOVA and Tukey HSD tests (α=.05).</span></p></div><div><h3>Results</h3><p>Two-way ANOVA results of the ∆E*_ab values revealed significant interaction between the gingival color and the measurement area (<em>P</em>=.002). The ∆E*_ab and ΔE₀₀ values of laminate veneers were significantly higher in the LP-V group that presented values above AT (<em>P</em>&lt;.001). Measurement area significantly influenced ∆E values of laminate veneers (<em>P</em>&lt;.001). Greater ∆E values were registered at the measurement area of the cervical third in the groups of LP-DP, LP-Br, LP-V, and Or-V. Regardless of the measurement area, ∆E₀₀ values below AT were obtained for the gingival color groups of LP-Or, DP-Or, DP-Br, and DP-V.</p></div><div><h3>Conclusions</h3><p>Gingival color influenced the color differences of laminate veneers. When the gingival color was a darker gingival color, rather than light pink, the color difference increased, especially at the measurement area of the cervical third.</p></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141534588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bonding affinity and durability of recycled zirconia","authors":"","doi":"10.1016/j.prosdent.2024.06.017","DOIUrl":"10.1016/j.prosdent.2024.06.017","url":null,"abstract":"<div><h3>Statement of problem</h3><p>While repurposing waste materials into zirconia blocks presents a promising avenue, uncertainty remains regarding whether the bonding properties of recycled zirconia align with those of commercially available zirconia.</p></div><div><h3>Purpose</h3><p>The purpose of this in vitro study was to evaluate the bonding affinity and durability of composite resin to recycled zirconia.</p></div><div><h3>Material and methods</h3><p>A series of processing steps were performed with recycled zirconia residuals (Lava Plus; 3M Oral Care), including pulverization, sieving, heating, compaction, isostatic pressing, and presintering. The presintered blocks of recycled zirconia (Group R) and commercially available zirconia (Group C) were sectioned and sintered to create test specimens (10×10×1.5 mm). After polishing and airborne-particle abrasion, specimens within each group were bonded to composite resin cylinders using a resin cement (Multilink Speed; Ivoclar AG). The specimens were then divided into 3 subgroups for shear bond strength (SBS) testing: no further treatment, 10 000 thermocycles, and 30 000 thermocycles (n=10). X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), surface roughness, and contact angle were used to analyze the surface physicochemical differences between Groups C and R. Data were analyzed with 2-way ANOVA followed by the Tukey post hoc test for SBS values, Pearson chi-squared test for failure modes, and independent <em>t</em> test for grain size, surface roughness, and wettability (α=.05).</p></div><div><h3>Results</h3><p>No significant difference was found in the SBS values between Group R and Group C (<em>P</em>=.403), while thermocycling significantly affected the SBS values (<em>P</em>&lt;.05). Group R showed significantly greater R_a, R_z, and R_q values (<em>P</em>&lt;.05) than did Group C. SEM analysis revealed that Group R exhibited more prominent grooves than Group C, while the XRD and EDS patterns exhibited similarities in both the crystalline phase and elemental composition. No significant difference was observed in the water contact angle between the 2 groups (<em>P</em>=.196).</p></div><div><h3>Conclusions</h3><p>The bonding protocol established for commercially available zirconia was comparable with that of recycled zirconia, but both decreased after thermocycling. The recycling process did not affect the crystalline phase or elemental composition of the zirconia, but it induced alterations in the surface roughness.</p></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022391324004499/pdfft?md5=622f795c29ceb83810daf28fe794907f&pid=1-s2.0-S0022391324004499-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141626957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of various anthropometric measurements for the determination of the occlusal vertical dimension","authors":"","doi":"10.1016/j.prosdent.2024.07.006","DOIUrl":"10.1016/j.prosdent.2024.07.006","url":null,"abstract":"<div><h3>Statement of problem</h3><p>Studies on anthropometric measurements, one of the methods used in determining the occlusal vertical dimension, have been limited to the evaluation of only a few facial and hand parameters.</p></div><div><h3>Purpose</h3><p>The purpose of this clinical study was to determine the possible relationships between all facial and hand measurements reported in the literature and assumed to be correlated with the occlusal vertical dimension and reveal their proportional relationships.</p></div><div><h3>Material and methods</h3><p>The study included a total of 271 participants, 136 women (30.37 ±8.09 years) and 135 men (30.42 ±8.49 years). A total of 36 measurements, including 4 occlusal vertical dimensions and 24 facial and 8 hand measurements, were obtained for each participant. Measurements were obtained directly from the soft tissue landmarks of the participants using 4 digital vernier calipers (Accud Digital Caliper; Accud), each designed for a different purpose. The normality of the parameters was analyzed using the Kolmogorov–Smirnov and Shapiro–Wilk tests, and the relationships between the parameters were analyzed using the Pearson correlation analysis (α=.05). Simple and multivariate linear regression analyses were also performed. Correlation coefficients were categorized as strong (r≥0.6), moderate (0.6&gt;r&gt;0.3), and weak (r≤0.3). Moreover, regression formulas were established for strongly correlated parameters.</p></div><div><h3>Results</h3><p>Facial and hand measurements that showed strong correlations with occlusal vertical dimension measurements were the distance between the pupil of the eyes, the pupil of the eye-to-cheilion, sellion-to-stomion, sellion-to-labiale inferius, stomion-to-pogonion, meatus-to-exocanthion, and exocanthion-to-cheilion distances and the 4-finger width measurement between the index and little fingers.</p></div><div><h3>Conclusions</h3><p>Certain anthropometric facial and hand measurements and regression formulas derived from the parameters that revealed strong correlations can be used to determine the occlusal vertical dimension.</p></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141902039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of different surface locking patterns on the trueness of complete arch digital implant scans: An in vitro study","authors":"","doi":"10.1016/j.prosdent.2024.05.019","DOIUrl":"10.1016/j.prosdent.2024.05.019","url":null,"abstract":"<div><h3>Statement of problem</h3><p>The effect of different surface locking patterns on the trueness of a digital implant scan of a completely edentulous arch remains uncertain.</p></div><div><h3>Purpose</h3><p>The purpose of this in vitro study was to evaluate whether locking surfaces with different patterns affected the trueness of complete arch implant digital scans.</p></div><div><h3>Material and methods</h3><p><span>An edentulous maxillary cast with 4 implants (2 anterior implants parallel and 2 posterior implants tilted at 17 degrees) was fabricated. Four implant-level scan bodies were fixed onto the implants, and the cast was scanned with a desktop scanner to create the reference file. Four groups (L0, L1, L2, and L3) were formed, each with a distinct locking surface configuration, and all scans were made using the same intraoral scanner. L0 kept all 4 implant-level scan bodies during scanning. L1 involved removing the right </span>first premolar<span> (RPM) scan body, scanning the other 3 implant scan bodies, then reattaching the RPM's scan body, and continuing scanning. In L2, the RPM and right lateral incisor<span> (RIC) scan bodies were removed, followed by scanning the left implants to create a locking surface, and scanning the right implants. In L3, only the left posterior molar’s (LPM) scan body was retained and scanned; then a locking surface was generated, and then the remaining implants were scanned. A metrology software program (Geomagic Control X) was used for comparison. Statistical analyses were performed using the Kruskal-Wallis, the 1-way ANOVA, the Welch ANOVA, the Friedman test<span>, the repeated-measures ANOVA, the Bonferroni post hoc test, and the Games-Howell post hoc test (α=.05).</span></span></span></p></div><div><h3>Results</h3><p>Significant 3D surface deviations were observed in the coronal bevel (CB) region and in the entire scan bodies when assessing trueness in the L0, L1, L2, and L3 groups (<em>P</em>&lt;.001). L2 exhibited the highest discrepancies in 3D surface deviation for CB (0.030 ±0.002 mm) and implant scan bodies (0.357 ±0.052 mm) and distance deviation, while the highest mean angular deviation values were found in L0 (0.924 ±0.131 degrees).</p></div><div><h3>Conclusions</h3><p>Locking half of the arch showed the highest trueness discrepancies when performing digital scans for complete arch implant-supported prostheses.</p></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141450742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Patient satisfaction with different types of craniofacial prostheses","authors":"","doi":"10.1016/j.prosdent.2022.08.019","DOIUrl":"10.1016/j.prosdent.2022.08.019","url":null,"abstract":"<div><h3>Statement of problem</h3><p>A maxillofacial prosthesis represents an effective method of giving maxillofacial defects a positive esthetic appearance with minimal risk. However, studies of complications among prosthesis wearers are lacking.</p></div><div><h3>Purpose</h3><p>The purpose of this cross-sectional study was to determine levels of patient satisfaction with various maxillofacial prostheses and retention types, as measured through a survey questionnaire package.</p></div><div><h3>Material and methods</h3><p>Patients treated at the Sunnybrook Health Sciences Center Craniofacial Prosthetics Unit (CPU) since 2015 were included. They had been treated according to a standardized protocol and answered a survey questionnaire package with the following sections: demographics, frequency of prosthesis usage, and the Toronto Outcome Measure for Craniofacial Prosthetics (TOMCP-27) survey addressing patient satisfaction. To be eligible for this study, patients must have been more than 18 years of age, in possession of a maxillofacial prosthesis, and received treatment at the Sunnybrook Health Sciences Center CPU since 2015.</p></div><div><h3>Results</h3><p>A total of 157 patients were eligible and contacted, of whom 51 agreed to participate in the survey. The study population was overall extremely satisfied with their maxillofacial prostheses. In 77.8% of the TOMCP-27 questions, the largest group of patients chose the answer demonstrating the highest level of satisfaction. Of all prosthesis types surveyed, patients with auricular prostheses reported the greatest rates of satisfaction, with the entire group having selected answers corresponding to the highest levels of overall satisfaction. However, patients with orbital prostheses were more likely to experience varying degrees of dissatisfaction, with 72% of the highest reported levels of dissatisfaction being from this prosthesis group. In addition, patients with osseointegrated implant-retained prostheses reported higher satisfaction levels with other retention methods, with the bar clasp group outperforming the magnetic coupling retention group.</p></div><div><h3>Conclusions</h3><p>Patients experienced an excellent overall rate of satisfaction with their maxillofacial prostheses. Future development should focus on the continued development of osseointegrated methods, improved magnetic coupling, and improved prosthesis technology, especially for orbital prostheses.</p></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40378775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accuracy of computer-aided design trial restorations fabricated with different digital workflows","authors":"","doi":"10.1016/j.prosdent.2023.09.034","DOIUrl":"10.1016/j.prosdent.2023.09.034","url":null,"abstract":"<div><h3>Statement of problem</h3><p>Trial restorations are a versatile tool for visualizing the esthetic treatment plan and should be an accurate replica of the planned smile design. The accuracy of conventionally fabricated trial restorations has been investigated; however, studies on the accuracy of different digital workflows for trial restoration fabrication are lacking.</p></div><div><h3>Purpose</h3><p>The purpose of this in vitro study was to evaluate the accuracy of computer-aided design (CAD) trial restorations fabricated with different digital workflows.</p></div><div><h3>Material and methods</h3><p>A patient in need of additive esthetic treatment was examined, and intraoral and extraoral photographs and intraoral digital scans were made, followed by 3D digital smile design using the exocad software program. The reference virtual design was converted into trial restorations (N=40) by using different digital workflows: subtractive manufacturing, additive manufacturing, additive manufacturing of 3D designed index, and silicone index on an additively manufactured cast. Fabricated trial restorations of all groups were scanned with a desktop scanner, providing a standard tessellation language (STL) file serving as the test data for each trial restoration. All the STL files of the test and reference data were imported into a reverse engineering software program to evaluate the 3D trueness of each workflow. Also, analog and digital 2D linear measurements (maxillary left central incisor height, maxillary left central incisor width, and intercanine width) were made to assess any dimensional alterations between the fabricated trial restorations and the reference digital smile design. A 1-way analysis of variance (ANOVA) was used to analyze the data followed by the Tukey post hoc test (α=.05).</p></div><div><h3>Results</h3><p>For 3D trueness measurements, root mean square (RMS) values representing the deviations between the fabricated trial restorations and the reference digital smile design varied significantly among the different groups (<em>P</em>&lt;.001), with the highest mean deviation found in the group of additive manufacturing of 3D designed index (0.21 ±0.01 mm), while the lowest mean value of deviation was found in the group of subtractive manufacturing (0.11 ±0.02 mm). For both the digital and analog 2D linear measurements, post hoc pairwise comparisons showed the group of additive manufacturing of 3D designed index to have significantly higher values of deviation than the other groups in all assigned measurements (<em>P</em>&lt;.001).</p></div><div><h3>Conclusions</h3><p>The accuracy of CAD trial restorations was affected by the fabrication technique, and implementing conventional steps in the digital workflows of trial restoration fabrication may result in discrepancies that affect accuracy when compared with the reference design.</p></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022391323006509/pdfft?md5=a2b1d7aac5e2b11789b26ef03c5e4ece&pid=1-s2.0-S0022391323006509-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71482798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Essentials","authors":"","doi":"10.1016/S0022-3913(24)00531-6","DOIUrl":"10.1016/S0022-3913(24)00531-6","url":null,"abstract":"","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022391324005316/pdfft?md5=cca355e48922e72df8938e6c839f432a&pid=1-s2.0-S0022391324005316-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142163005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}