Pub Date : 2025-02-01DOI: 10.1016/j.prosdent.2024.10.012
Yi Zhou DDS, MD , Wenjia Chen MDS , Han Zhu MDS , Xiaochen Liu DDS, MD , Haiping Yang DDS, MD , Fuming He DDS, MD
Statement of problem
The machining accuracy and marginal integrity of monolithic zirconia crowns with minimal invasive preparations may impact the long-term survival rate of tooth and periodontal health, but studies on the effect of machining method are lacking.
Purpose
The purpose of this in vitro study was to digitally evaluate the machining accuracy and margin quality of monolithic zirconia crowns fabricated using gel deposition and conventional soft milling processes by comparing 2 different margin types.
Material and methods
A total of 40 monolithic zirconia crowns were produced using gel deposition (Self-glazed Zirconia Group, SGG, n=20) and soft milling (Milled Zirconia Group, MG, n=20). Each group was further divided into 2 subgroups with different margin designs (chamfer and feather-edge). The trueness and fit of crowns were compared using root mean square (RMS) values. Furthermore, the margin quality was examined before and after final sintering with a scanning electron microscope (SEM). The Scheirer-Ray-Hare and 2-way ANOVA test analysis nonparametric and parametric data, respectively (α=.05).
Results
The trueness analysis revealed that SGG had significantly lower RMS values for both the cameo and intaglio areas compared with MG (P<.001). In addition, crowns with a feather-edge margin exhibited significantly lower marginal RMS values than those with a chamfer margin (P<.01) according to the fit assessment. Followed by milling processes, SGG exhibited a constantly homogeneous microstructure compared with MG. Marginal defects were detected in both groups except for the SGG with the chamfer margin.
Conclusions
SGG exhibited better accuracy associated with ductile-regime machining than MG, and SGG with chamfer margins displayed flaw-free margin areas. Moreover, the feather-edge margin showed improved marginal fit compared with the chamfer margin.
{"title":"Effect of machining method and margin design on the accuracy and margin quality of monolithic zirconia crowns","authors":"Yi Zhou DDS, MD , Wenjia Chen MDS , Han Zhu MDS , Xiaochen Liu DDS, MD , Haiping Yang DDS, MD , Fuming He DDS, MD","doi":"10.1016/j.prosdent.2024.10.012","DOIUrl":"10.1016/j.prosdent.2024.10.012","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The machining accuracy and marginal integrity of monolithic zirconia crowns with minimal invasive preparations may impact the long-term survival rate of tooth and periodontal health, but studies on the effect of machining method are lacking.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to digitally evaluate the machining accuracy and margin quality of monolithic zirconia crowns fabricated using gel deposition and conventional soft milling processes by comparing 2 different margin types.</div></div><div><h3>Material and methods</h3><div>A total of 40 monolithic zirconia crowns were produced using gel deposition (Self-glazed Zirconia Group, SGG, n=20) and soft milling (Milled Zirconia Group, MG, n=20). Each group was further divided into 2 subgroups with different margin designs (chamfer and feather-edge). The trueness and fit of crowns were compared using root mean square (RMS) values. Furthermore, the margin quality was examined before and after final sintering with a scanning electron microscope (SEM). The Scheirer-Ray-Hare and 2-way ANOVA test analysis nonparametric and parametric data, respectively (α=.05).</div></div><div><h3>Results</h3><div>The trueness analysis revealed that SGG had significantly lower RMS values for both the cameo and intaglio areas compared with MG (<em>P</em><.001). In addition, crowns with a feather-edge margin exhibited significantly lower marginal RMS values than those with a chamfer margin (<em>P</em><.01) according to the fit assessment. Followed by milling processes, SGG exhibited a constantly homogeneous microstructure compared with MG. Marginal defects were detected in both groups except for the SGG with the chamfer margin.</div></div><div><h3>Conclusions</h3><div>SGG exhibited better accuracy associated with ductile-regime machining than MG, and SGG with chamfer margins displayed flaw-free margin areas. Moreover, the feather-edge margin showed improved marginal fit compared with the chamfer margin.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 592.e1-592.e9"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142576332","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}
Pub Date : 2025-02-01DOI: 10.1016/j.prosdent.2024.10.024
Pranit V. Bora BDS, MS , Nathaniel C. Lawson DMD, PhD , Daniel A. Givan DDS, PhD , Celin Arce DDS, MS , Howard Roberts DMD
Statement of problem
The effect of 3-dimensional (3D) printed crown materials with lower flexural strength but higher ductility than lithium disilicate on enamel wear and fatigue resistance is unknown.
Purpose
The purpose of this in vitro study was to compare the enamel wear and fatigue resistance of a 50% filled 3D printed crown material with lithium disilicate.
Material and methods
Disks of a 3D printed crown material (Ceramic Crown; SprintRay Inc) and lithium disilicate (IPS e.max CAD; Ivoclar AG) (n=8) were tested for wear in a custom Alabama wear testing device which applied a 20-N load and 2-mm horizontal slide. The test was run for 400 000 cycles at 1 Hz in a 33% glycerin solution. Cusps of extracted human molars were used as the antagonists. The volumetric wear of the restorative material and enamel antagonists were measured every 100 000 cycles using a profilometer. Worn specimens were examined with a scanning electron microscope. Human molars were prepared for occlusal onlay preparations, and 1.2-mm 3D printed (Ceramic Crown) or lithium disilicate (IPS e.max CAD) restorations (n=10) were bonded to the teeth with resin cement. Restorations were subjected to 2 million cycles of fatigue loading (50 N, 1 Hz) in water against a Ø7.8-mm steel ball. Restorations were monitored for cracks every 100 000 cycles with transillumination and every1 million cycles with microcomputed tomography (µCT). After fatigue, specimens were fractured in a load-to-failure test. Fractured specimens were examined with µCT. Statistical analyses were performed with 2-way mixed ANOVAs and a t test (α=.05).
Results
The wear and opposing enamel wear of lithium disilicate was greater than the 3D printed material at every interval of cycles tested (P<.001). None of the restorations showed signs of internal cracks up to 2 million cycles of fatigue. No statistical difference was found in the load-to-failure fracture load of the 3D printed (2574 ±303 N) or lithium disilicate (2396 ±277 N) restorations (P=.110).
Conclusions
For the conditions tested, the 3D printed crown material demonstrated less wear than lithium disilicate and created less opposing enamel wear. All the occlusal onlay restorations survived 2 million cycles of fatigue at a 50-N load without signs of cracks. These results provide some support for the use of these restorations at 1.2-mm occlusal thickness when bonded with a resin cement.
{"title":"Enamel wear and fatigue resistance of 3D printed resin compared with lithium disilicate","authors":"Pranit V. Bora BDS, MS , Nathaniel C. Lawson DMD, PhD , Daniel A. Givan DDS, PhD , Celin Arce DDS, MS , Howard Roberts DMD","doi":"10.1016/j.prosdent.2024.10.024","DOIUrl":"10.1016/j.prosdent.2024.10.024","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The effect of 3-dimensional (3D) printed crown materials with lower flexural strength but higher ductility than lithium disilicate on enamel wear and fatigue resistance is unknown.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to compare the enamel wear and fatigue resistance of a 50% filled 3D printed crown material with lithium disilicate.</div></div><div><h3>Material and methods</h3><div>Disks of a 3D printed crown material (Ceramic Crown; SprintRay Inc) and lithium disilicate (IPS e.max CAD; Ivoclar AG) (n=8) were tested for wear in a custom Alabama wear testing device which applied a 20-N load and 2-mm horizontal slide. The test was run for 400 000 cycles at 1 Hz in a 33% glycerin solution. Cusps of extracted human molars were used as the antagonists. The volumetric wear of the restorative material and enamel antagonists were measured every 100 000 cycles using a profilometer. Worn specimens were examined with a scanning electron microscope. Human molars were prepared for occlusal onlay preparations, and 1.2-mm 3D printed (Ceramic Crown) or lithium disilicate (IPS e.max CAD) restorations (n=10) were bonded to the teeth with resin cement. Restorations were subjected to 2 million cycles of fatigue loading (50 N, 1 Hz) in water against a Ø7.8-mm steel ball. Restorations were monitored for cracks every 100 000 cycles with transillumination and every1 million cycles with microcomputed tomography (µCT). After fatigue, specimens were fractured in a load-to-failure test. Fractured specimens were examined with µCT. Statistical analyses were performed with 2-way mixed ANOVAs and a <em>t</em> test (α=.05).</div></div><div><h3>Results</h3><div>The wear and opposing enamel wear of lithium disilicate was greater than the 3D printed material at every interval of cycles tested (<em>P</em><.001). None of the restorations showed signs of internal cracks up to 2 million cycles of fatigue. No statistical difference was found in the load-to-failure fracture load of the 3D printed (2574 ±303 N) or lithium disilicate (2396 ±277 N) restorations (<em>P</em>=.110).</div></div><div><h3>Conclusions</h3><div>For the conditions tested, the 3D printed crown material demonstrated less wear than lithium disilicate and created less opposing enamel wear. All the occlusal onlay restorations survived 2 million cycles of fatigue at a 50-N load without signs of cracks. These results provide some support for the use of these restorations at 1.2-mm occlusal thickness when bonded with a resin cement.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 523.e1-523.e9"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622697","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}
Pub Date : 2025-02-01DOI: 10.1016/j.prosdent.2024.11.001
Top Chitkraisorn DDS , Kunyawan Thaungwilai MS , Boonsong Prateepsawangwong DDS, MS , Pairod Singhatanadgid PhD , Terawat Tosiriwatanapong DDS, CAGS, DScD
Statement of problem
Restoring endodontically treated premolars with noncircular canals presents a significant challenge.
Purpose
The purpose of this study was to compare the in vitro fracture resistance and the finite element computational calculation-based stress and safety factor of noncircular-shaped, endodontically treated premolars restored with 5 different prefabricated and custom computer-aided design and computer-aided manufactured post-and-core systems.
Material and methods
Fifty single-rooted oval-shaped canal maxillary premolars were endodontically treated and post spaces were prepared. The specimens were divided into 5 categories on the basis of the post-and-core system used: Group CN composite resin core without a post, Group CF prefabricated fiber-reinforced composite resin post and composite resin core, Group IC interpenetrating phase composite post-and-core, Group LS lithium disilicate post-and-core, and Group ZR zirconia post-and-core. Lithium disilicate crowns were fabricated and cemented on the 5 different post-and-core systems and subjected to a fracture resistance test using a spherical indenter with static loading. Differences in fracture resistance were evaluated using a 1-way analysis of variance (ANOVA) (α=.05). The 3-dimensional finite element method was used to determine the von Mises stress and safety factors, defined as the ratio of the material's strength to the von Mises stress experienced, within different compartments of the restored tooth model.
Results
In the in vitro fracture resistance test, the mean ±standard deviation fracture loads of the 5 groups were 2144 ±515 N, 1801 ±600 N, 1690 ±312 N, 1612 ±545 N, and 1487 ±600 N, respectively and were statistically similar (P=.078). All specimens within the ZR group exhibited restorable fractures. In contrast, only 30% of the CN group specimens showed restorable fractures. The incidence of restorable fractures in the CF, IC, and LS groups was 70%, 80%, and 70%, respectively. Although all groups showed similar maximum von Mises stress and stress distribution, safety factors in the models varied significantly. The ceramic crown was the weakest component in the LS and ZR groups, with much lower safety factors than dentin and post-and-core regions. Additionally, the CN group's wider dentin area had a demonstrably lower safety factor.
Conclusions
Endodontically treated noncircular-shaped canal premolars showed minimal effect on fracture resistance regardless of post type. However, for teeth with sufficient ferrule, using any post-and-core system significantly reduced the incidence of nonrestorable fractures compared with just a coronal foundation restoration, with custom zirconia offering the potential of achieving a restorable outcome after fracture.
{"title":"Fracture resistance, 3-dimensional finite element analysis, and safety factors for five post-and-core restorations with crowns placed in the noncircular-shaped canals of premolars","authors":"Top Chitkraisorn DDS , Kunyawan Thaungwilai MS , Boonsong Prateepsawangwong DDS, MS , Pairod Singhatanadgid PhD , Terawat Tosiriwatanapong DDS, CAGS, DScD","doi":"10.1016/j.prosdent.2024.11.001","DOIUrl":"10.1016/j.prosdent.2024.11.001","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Restoring endodontically treated premolars with noncircular canals presents a significant challenge.</div></div><div><h3>Purpose</h3><div>The purpose of this study was to compare the in vitro fracture resistance and the finite element computational calculation-based stress and safety factor of noncircular-shaped, endodontically treated premolars restored with 5 different prefabricated and custom computer-aided design and computer-aided manufactured post-and-core systems.</div></div><div><h3>Material and methods</h3><div>Fifty single-rooted oval-shaped canal maxillary premolars were endodontically treated and post spaces were prepared. The specimens were divided into 5 categories on the basis of the post-and-core system used: Group CN composite resin core without a post, Group CF prefabricated fiber-reinforced composite resin post and composite resin core, Group IC interpenetrating phase composite post-and-core, Group LS lithium disilicate post-and-core, and Group ZR zirconia post-and-core. Lithium disilicate crowns were fabricated and cemented on the 5 different post-and-core systems and subjected to a fracture resistance test using a spherical indenter with static loading. Differences in fracture resistance were evaluated using a 1-way analysis of variance (ANOVA) (α=.05). The 3-dimensional finite element method was used to determine the von Mises stress and safety factors, defined as the ratio of the material's strength to the von Mises stress experienced, within different compartments of the restored tooth model.</div></div><div><h3>Results</h3><div>In the in vitro fracture resistance test, the mean ±standard deviation fracture loads of the 5 groups were 2144 ±515 N, 1801 ±600 N, 1690 ±312 N, 1612 ±545 N, and 1487 ±600 N, respectively and were statistically similar (<em>P</em>=.078). All specimens within the ZR group exhibited restorable fractures. In contrast, only 30% of the CN group specimens showed restorable fractures. The incidence of restorable fractures in the CF, IC, and LS groups was 70%, 80%, and 70%, respectively. Although all groups showed similar maximum von Mises stress and stress distribution, safety factors in the models varied significantly. The ceramic crown was the weakest component in the LS and ZR groups, with much lower safety factors than dentin and post-and-core regions. Additionally, the CN group's wider dentin area had a demonstrably lower safety factor.</div></div><div><h3>Conclusions</h3><div>Endodontically treated noncircular-shaped canal premolars showed minimal effect on fracture resistance regardless of post type. However, for teeth with sufficient ferrule, using any post-and-core system significantly reduced the incidence of nonrestorable fractures compared with just a coronal foundation restoration, with custom zirconia offering the potential of achieving a restorable outcome after fracture.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 512.e1-512.e9"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142791951","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}
Pub Date : 2025-02-01DOI: 10.1016/j.prosdent.2025.01.004
Jonathan L. Ferencz DDS
{"title":"JPD Digital progress report","authors":"Jonathan L. Ferencz DDS","doi":"10.1016/j.prosdent.2025.01.004","DOIUrl":"10.1016/j.prosdent.2025.01.004","url":null,"abstract":"","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 333-334"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143066353","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}
Pub Date : 2025-02-01DOI: 10.1016/j.prosdent.2023.03.004
Cícero Andrade Sigilião Celles DDS , Izabela Ferreira DDS , Mariana da Lima da Costa Valente PhD , Andréa Cândido dos Reis PhD
Statement of problem
The drilling speed used for preparing dental implants may affect bone-implant contact (BIC), implant stability quotient (ISQ), and bone area fraction occupancy (BAFO). Different rotational speeds and the presence or absence of irrigation during site preparation have been investigated, but an established protocol for achieving the best osseointegration results is lacking.
Purpose
The purpose of this systematic review was to investigate the influence of drill rotational speed on bone drilling for dental implant placement and its relationship with osseointegration.
Material and methods
This review included the preferred reporting items for systematic reviews and meta-analyses (PRISMA) and was registered in the international prospective register of systematic reviews (PROSPERO) database. Electronic searches were performed in the MEDLINE (PubMed), Scopus, Science Direct, and Embase databases. The risk of bias was analyzed by using the systematic review center for laboratory animal experimentation (SYRCLE).
Results
A total of 1282 articles were found, and after removing duplicates and applying the eligibility criteria to in vivo articles on animals that addressed drilling speed and its relationship to osseointegration, 8 articles were selected for analysis. Of these, 5 articles showed no statistical differences, and 3 others showed significantly better osseointegration results by analyzing the parameters of BIC, BAFO, ISQs, and pull-out forces (PoFs). In all selected articles, high-speed drilling was performed with irrigation.
Conclusions
Although drilling speed seems to affect bone perforation, no definitive protocol was found in the literature consulted. The results vary depending on the combination of different factors, including bone type, irrigation, and drilling speed.
{"title":"Osseointegration in relation to drilling speed in the preparation of dental implants sites: A systematic review","authors":"Cícero Andrade Sigilião Celles DDS , Izabela Ferreira DDS , Mariana da Lima da Costa Valente PhD , Andréa Cândido dos Reis PhD","doi":"10.1016/j.prosdent.2023.03.004","DOIUrl":"10.1016/j.prosdent.2023.03.004","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The drilling speed used for preparing dental implants<span> may affect bone-implant contact (BIC), implant stability quotient (ISQ), and bone area fraction occupancy (BAFO). Different rotational speeds and the presence or absence of irrigation during site preparation have been investigated, but an established protocol for achieving the best osseointegration results is lacking.</span></div></div><div><h3>Purpose</h3><div><span>The purpose of this systematic review was to investigate the influence of drill rotational speed on bone drilling for </span>dental implant placement and its relationship with osseointegration.</div></div><div><h3>Material and methods</h3><div>This review included the preferred reporting items for systematic reviews and meta-analyses (PRISMA) and was registered in the international prospective register of systematic reviews (PROSPERO) database. Electronic searches were performed in the MEDLINE (PubMed), Scopus, Science Direct, and Embase databases. The risk of bias was analyzed by using the systematic review center for laboratory animal experimentation (SYRCLE).</div></div><div><h3>Results</h3><div>A total of 1282 articles were found, and after removing duplicates and applying the eligibility criteria to in vivo articles on animals that addressed drilling speed and its relationship to osseointegration, 8 articles were selected for analysis. Of these, 5 articles showed no statistical differences, and 3 others showed significantly better osseointegration results by analyzing the parameters of BIC, BAFO, ISQs, and pull-out forces (PoFs). In all selected articles, high-speed drilling was performed with irrigation.</div></div><div><h3>Conclusions</h3><div>Although drilling speed seems to affect bone perforation, no definitive protocol was found in the literature consulted. The results vary depending on the combination of different factors, including bone type, irrigation, and drilling speed.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 394-401"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9245702","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}
Pub Date : 2025-02-01DOI: 10.1016/j.prosdent.2023.03.015
Caio Sampaio DDS, MSc, PhD , Juliano P. Pessan DDS, MSc, PhD , Gabriel P. Nunes DDS, MSc , Marcela B. Magno DDS, MSc, PhD , Lucianne C. Maia DDS, MSc, PhD , Rob Exterkate PhD , Dongmei Deng DDS, PhD , Douglas R. Monteiro DDS, MSc, PhD
Statement of problem
Despite the importance of Candida spp. on the etiology of denture stomatitis (DS), information on the role of the bacterial component is still scarce.
Purpose
The purpose of this systematic review was to evaluate whether the counts of Staphylococcus aureus and Streptococcus mutans were changed in complete denture wearers diagnosed with Candida-associated DS.
Material and methods
The literature search was performed in 8 databases and by hand searching. The risk of bias was assessed according to the Newcastle-Ottawa qualifier. Meta-analyses were performed considering the microorganism evaluated (S. aureus or S. mutans) and the collection area (mucosa or dentures). The certainty of evidence was assessed according to the grading of recommendations assessment, development and evaluations (GRADE) criteria.
Results
Participants with DS presented higher counts of S. aureus in the mucosa compared with those from the control group (OR, 3.16 [1.62, 6.15]; P<.001). No significant difference between the groups was observed for samples collected from dentures (OR, 0.73 [0.50, 1.07]; P=.110). Conversely, participants without DS presented higher counts of S. mutans both in the mucosa (OR, 0.19 [0.06, 0.63]; P=.006) and dentures (OR, 0.64 [0.41, 1.0]; P=.050).
Conclusions
Microbial counts in participants with DS changed as a function of the type of microorganism and collection site. The certainty of evidence ranged from very low to low. The findings reinforce the fact that bacteria also play a relevant role in DS and should be more extensively studied. Such information may be useful to guide further therapies to prevent or control DS.
{"title":"Are the counts of Streptococcus mutans and Staphylococcus aureus changed in complete denture wearers carrying denture stomatitis? A systematic review with meta-analyses","authors":"Caio Sampaio DDS, MSc, PhD , Juliano P. Pessan DDS, MSc, PhD , Gabriel P. Nunes DDS, MSc , Marcela B. Magno DDS, MSc, PhD , Lucianne C. Maia DDS, MSc, PhD , Rob Exterkate PhD , Dongmei Deng DDS, PhD , Douglas R. Monteiro DDS, MSc, PhD","doi":"10.1016/j.prosdent.2023.03.015","DOIUrl":"10.1016/j.prosdent.2023.03.015","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Despite the importance of <em>Candida</em><span> spp. on the etiology of denture stomatitis (DS), information on the role of the bacterial component is still scarce.</span></div></div><div><h3>Purpose</h3><div><span>The purpose of this systematic review was to evaluate whether the counts of </span><span><span>Staphylococcus aureus</span></span> and <span><span>Streptococcus mutans</span></span> were changed in complete denture wearers diagnosed with <em>Candida</em>-associated DS.</div></div><div><h3>Material and methods</h3><div>The literature search was performed in 8 databases and by hand searching. The risk of bias was assessed according to the Newcastle-Ottawa qualifier. Meta-analyses were performed considering the microorganism evaluated (<em>S. aureus</em> or <em>S. mutans</em>) and the collection area (mucosa or dentures). The certainty of evidence was assessed according to the grading of recommendations assessment, development and evaluations (GRADE) criteria.</div></div><div><h3>Results</h3><div>Participants with DS presented higher counts of <em>S. aureus</em><span> in the mucosa compared with those from the control group (OR, 3.16 [1.62, 6.15]; </span><em>P</em><.001). No significant difference between the groups was observed for samples collected from dentures (OR, 0.73 [0.50, 1.07]; <em>P</em>=.110). Conversely, participants without DS presented higher counts of <em>S. mutans</em> both in the mucosa (OR, 0.19 [0.06, 0.63]; <em>P</em>=.006) and dentures (OR, 0.64 [0.41, 1.0]; <em>P</em>=.050).</div></div><div><h3>Conclusions</h3><div>Microbial counts in participants with DS changed as a function of the type of microorganism and collection site. The certainty of evidence ranged from very low to low. The findings reinforce the fact that bacteria also play a relevant role in DS and should be more extensively studied. Such information may be useful to guide further therapies to prevent or control DS.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 427-437"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9420974","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}
Pub Date : 2025-02-01DOI: 10.1016/j.prosdent.2023.03.029
Jiang Wu PhD, DDS , Liaoliao Wang MDS , Bo Gao PhD, DDS
Guiding planes are essential to the success of removable partial dentures (RPDs). With computer-aided design and computer-aided manufacturing (CAD-CAM), this report presents a novel method of designing and fabricating preparation templates to precisely prepare guiding planes for RPD abutments.
{"title":"Digital design and fabrication of a template to prepare guiding planes in removable partial denture abutments","authors":"Jiang Wu PhD, DDS , Liaoliao Wang MDS , Bo Gao PhD, DDS","doi":"10.1016/j.prosdent.2023.03.029","DOIUrl":"10.1016/j.prosdent.2023.03.029","url":null,"abstract":"<div><div><span>Guiding planes are essential to the success of removable partial dentures (RPDs). With computer-aided design and computer-aided manufacturing (CAD-CAM), this report presents a novel method of designing and fabricating preparation </span>templates<span> to precisely prepare guiding planes for RPD abutments.</span></div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 376-379"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9431843","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}
Pub Date : 2025-02-01DOI: 10.1016/j.prosdent.2024.02.024
Amit Gaikwad BDS, MDS , Marjan Kheirmand Parizi DDS , Andreas Winkel Dr rer nat , Meike Stiesch Dr med dent
Statement of problem
The hydrophobic and bioinert nature of polyetheretherketone (PEEK) implants needs to be addressed for successful osseointegration.
Purpose
The purpose of this in vitro study was to evaluate the osteoblast cell behavior on PEEK implant surfaces treated with airborne-particle abrasion using different grit size aluminum oxide (Al2O3) particles.
Material and methods
Disk-shaped specimens (n=96) were prepared from medical grade PEEK rods and were distributed into 4 groups (n=24) of untreated PEEK (PEEK 0), airborne-particle abrasion using 50-μm Al2O3 particles (PEEK 50), airborne-particle abrasion using 110-μm Al2O3 particles (PEEK 110), and airborne-particle abrasion using 150-μm Al2O3 particles (PEEK 150). The surface characteristics were assessed using water contact angle (WCA) measurements and scanning electron microscopy (SEM). MG-63 osteoblast cells were cultured, and the biocompatibility of PEEK was assessed using a CellTiter-blue cell viability assay and florescence staining at day 1, 3, and 7. The specimens were stained with Alizarin red to assess the osteoblast cell differentiation on day 10 and 14. The Levene test was used to test the homogeneity of variances. One-way and Welch ANOVA with post hoc corrections were used to assess the overall statistical significance of differences among the groups (α=.05).
Results
The lowest mean WCA was demonstrated in PEEK 150 (49.25 ±5.51) and the highest in PEEK 0 (89.14 ±4.24) (P<.001). SEM images of PEEK 150 illustrated a more complex structure with a large area of globular outcroppings throughout the surface. PEEK 150 showed the highest cell metabolic activity at each time point with florescence staining showing a substantial cell confluence at day 3 and 7. Although PEEK 150 did not show a significant increase in cell proliferation, the number of cells attached was significantly higher than other groups (P<.05). PEEK 110 and 150 also showed a substantial increase in the extent of mineralization.
Conclusions
Airborne-particle abrasion using moderate Al2O3 grit size (110- or 150-μm) improved the hydrophilicity and osteoblast cell behavior on PEEK implants.
{"title":"Osteoblast cell behavior on polyetheretherketone dental implant surfaces treated with different grit size aluminum oxide particles: An in vitro analysis","authors":"Amit Gaikwad BDS, MDS , Marjan Kheirmand Parizi DDS , Andreas Winkel Dr rer nat , Meike Stiesch Dr med dent","doi":"10.1016/j.prosdent.2024.02.024","DOIUrl":"10.1016/j.prosdent.2024.02.024","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The hydrophobic and bioinert nature of polyetheretherketone (PEEK) implants needs to be addressed for successful osseointegration.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate the osteoblast cell behavior on PEEK implant surfaces treated with airborne-particle abrasion using different grit size aluminum oxide (Al<sub>2</sub>O<sub>3</sub>) particles.</div></div><div><h3>Material and methods</h3><div>Disk-shaped specimens (n=96) were prepared from medical grade PEEK rods and were distributed into 4 groups (n=24) of untreated PEEK (PEEK 0), airborne-particle abrasion using 50-μm Al<sub>2</sub>O<sub>3</sub> particles (PEEK 50), airborne-particle abrasion using 110-μm Al<sub>2</sub>O<sub>3</sub> particles (PEEK 110), and airborne-particle abrasion using 150-μm Al<sub>2</sub>O<sub>3</sub> particles (PEEK 150). The surface characteristics were assessed using water contact angle (WCA) measurements and scanning electron microscopy (SEM). MG-63 osteoblast cells were cultured, and the biocompatibility of PEEK was assessed using a CellTiter-blue cell viability assay and florescence staining at day 1, 3, and 7. The specimens were stained with Alizarin red to assess the osteoblast cell differentiation on day 10 and 14. The Levene test was used to test the homogeneity of variances. One-way and Welch ANOVA with post hoc corrections were used to assess the overall statistical significance of differences among the groups (α=.05).</div></div><div><h3>Results</h3><div>The lowest mean WCA was demonstrated in PEEK 150 (49.25 ±5.51) and the highest in PEEK 0 (89.14 ±4.24) (<em>P</em><.001). SEM images of PEEK 150 illustrated a more complex structure with a large area of globular outcroppings throughout the surface. PEEK 150 showed the highest cell metabolic activity at each time point with florescence staining showing a substantial cell confluence at day 3 and 7. Although PEEK 150 did not show a significant increase in cell proliferation, the number of cells attached was significantly higher than other groups (<em>P</em><.05). PEEK 110 and 150 also showed a substantial increase in the extent of mineralization.</div></div><div><h3>Conclusions</h3><div>Airborne-particle abrasion using moderate Al<sub>2</sub>O<sub>3</sub> grit size (110- or 150-μm) improved the hydrophilicity and osteoblast cell behavior on PEEK implants.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 531-539"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140771244","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}
The antimicrobial efficacy of lavender has been well evidenced. However, investigations into its impact on the mechanical properties of denture resins are lacking.
Purpose
The purpose of this in vitro study was to evaluate the flexural strength, impact strength, surface characteristics, roughness, elastic modulus, and yield strength of lavender-reinforced, heat-activated polymethyl methacrylate denture base resin.
Material and methods
A total of 200 specimens were categorized into 5 groups based on 0, 0.5, 1.0, 1.5, and 2.0 wt% of dry lavender extract incorporated into heat-activated polymethyl methacrylate denture base resin powder. Unmodified resin served as the control group. Flexural strength, elastic moduli, and yield strength were determined with a universal testing machine, impact strength with an Izod impact tester, surface characteristics with scanning electron microscopy, and roughness with a profilometer. The data were statistically analyzed with 1-way ANOVA followed by Tukey post hoc tests for pairwise comparison within the groups (α=.05).
Results
Compared with the control group, all the mechanical properties significantly improved with the addition of lavender (P<.001). The highest flexural, yield, and impact strengths and elastic modulus values were in the 2% group. Elevated surface roughness in 0.5, 1.0 and 1.5 wt% and a decline in roughness at 2 wt% were noted when compared with the control group.
Conclusions
The addition of lavender enhanced the flexural strength, yield strength, impact strength, elastic moduli, and decreased surface roughness when added at 2 wt%.
{"title":"Investigation of the mechanical properties of lavender-reinforced heat-activated polymethyl methacrylate denture base resin","authors":"Anitha Kuttae Viswanathan MDS , Rajkumar Krishnan MDS, PhD","doi":"10.1016/j.prosdent.2024.11.005","DOIUrl":"10.1016/j.prosdent.2024.11.005","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The antimicrobial efficacy of lavender has been well evidenced. However, investigations into its impact on the mechanical properties of denture resins are lacking.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate the flexural strength, impact strength, surface characteristics, roughness, elastic modulus, and yield strength of lavender-reinforced, heat-activated polymethyl methacrylate denture base resin.</div></div><div><h3>Material and methods</h3><div>A total of 200 specimens were categorized into 5 groups based on 0, 0.5, 1.0, 1.5, and 2.0 wt% of dry lavender extract incorporated into heat-activated polymethyl methacrylate denture base resin powder. Unmodified resin served as the control group. Flexural strength, elastic moduli, and yield strength were determined with a universal testing machine, impact strength with an Izod impact tester, surface characteristics with scanning electron microscopy, and roughness with a profilometer. The data were statistically analyzed with 1-way ANOVA followed by Tukey post hoc tests for pairwise comparison within the groups (α=.05).</div></div><div><h3>Results</h3><div>Compared with the control group, all the mechanical properties significantly improved with the addition of lavender (<em>P</em><.001). The highest flexural, yield, and impact strengths and elastic modulus values were in the 2% group. Elevated surface roughness in 0.5, 1.0 and 1.5 wt% and a decline in roughness at 2 wt% were noted when compared with the control group.</div></div><div><h3>Conclusions</h3><div>The addition of lavender enhanced the flexural strength, yield strength, impact strength, elastic moduli, and decreased surface roughness when added at 2 wt%.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 595.e1-595.e10"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142695553","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}
A technique to obtain more accurate complete arch implant digital scans and virtual casts is described. In order to obtain complete arch implant digital scans with greater accuracy, short-span intraoral digital scans are superimposed with the aid of a geometric pattern. Therefore, the technique takes advantage of the accuracy of intraoral scanners to obtain digital scans of reduced spans. Two virtual designs of the geometric pattern have been made available online: one for maxillary arches and one for mandibular arches. From these virtual designs, new virtual designs of geometric patterns of different sizes and shapes can be created to better fit different arch forms and implant positions.
{"title":"Obtaining more accurate complete arch implant digital scans with the aid of a geometric pattern: A dental technique","authors":"Olatz Etxaniz BEng, MSc , Xabier Amezua BEng, MSc, PhD , Mikel Jauregi BEng, MSc, PhD , Eneko Solaberrieta BEng, MSc, PhD","doi":"10.1016/j.prosdent.2024.01.041","DOIUrl":"10.1016/j.prosdent.2024.01.041","url":null,"abstract":"<div><div>A technique to obtain more accurate complete arch implant digital scans and virtual casts is described. In order to obtain complete arch implant digital scans with greater accuracy, short-span intraoral digital scans are superimposed with the aid of a geometric pattern. Therefore, the technique takes advantage of the accuracy of intraoral scanners to obtain digital scans of reduced spans. Two virtual designs of the geometric pattern have been made available online: one for maxillary arches and one for mandibular arches. From these virtual designs, new virtual designs of geometric patterns of different sizes and shapes can be created to better fit different arch forms and implant positions.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 370-375"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140094235","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}
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