Journal of Prosthetic Dentistry最新文献

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Fully digital workflow for the fabrication of polycarbonate-based resin diagnostic and interim flexible removable partial dentures: A dental technique.
IF 4.3 2区 医学
Journal of Prosthetic Dentistry Pub Date : 2025-02-19 DOI: 10.1016/j.prosdent.2025.01.046
Paola Maldonado, Rudolf Brugger, Bart Ziengs, Manrique Fonseca
{"title":"Fully digital workflow for the fabrication of polycarbonate-based resin diagnostic and interim flexible removable partial dentures: A dental technique.","authors":"Paola Maldonado, Rudolf Brugger, Bart Ziengs, Manrique Fonseca","doi":"10.1016/j.prosdent.2025.01.046","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.01.046","url":null,"abstract":"<p><p>This dental technique describes a fully digital workflow for the design and fabrication of interim removable partial dentures (RPDs) using a polycarbonate-based computer-aided design and computer-aided manufacture (CAD-CAM) material with custom-designed prosthetic teeth as an alternative to conventional interim RPDs with unesthetic metal clasps.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143468282","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}
引用次数: 0
Response to the Letter to the Editor regarding, "A technique to enhance the gingival esthetics of a prototype complete arch fixed implant-supported prototype prosthesis using a 3D printed gingival veneer" by Tao and Bidra.
IF 4.3 2区 医学
Journal of Prosthetic Dentistry Pub Date : 2025-02-19 DOI: 10.1016/j.prosdent.2025.02.002
Avinash S Bidra
{"title":"Response to the Letter to the Editor regarding, \"A technique to enhance the gingival esthetics of a prototype complete arch fixed implant-supported prototype prosthesis using a 3D printed gingival veneer\" by Tao and Bidra.","authors":"Avinash S Bidra","doi":"10.1016/j.prosdent.2025.02.002","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.002","url":null,"abstract":"","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143468288","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}
引用次数: 0
Seating-related adaptation and deformation of components of removable partial denture frameworks fabricated by different workflows. 采用不同工作流程制作的可摘局部义齿框架部件与就位相关的适应性和变形。
IF 4.3 2区 医学
Journal of Prosthetic Dentistry Pub Date : 2025-02-19 DOI: 10.1016/j.prosdent.2025.02.003
Assoc Prof Jaafar Abduo, Hadeel Ibrahim, Abdullah Barazanchi
{"title":"Seating-related adaptation and deformation of components of removable partial denture frameworks fabricated by different workflows.","authors":"Assoc Prof Jaafar Abduo, Hadeel Ibrahim, Abdullah Barazanchi","doi":"10.1016/j.prosdent.2025.02.003","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.003","url":null,"abstract":"<p><strong>Statement of problem: </strong>Removable partial denture (RPD) frameworks have traditionally been produced by conventional impression making and casting. Due to the popularity of intraoral scanning (IOS) and digital manufacturing, RPD frameworks can be produced by alternative workflows.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to assess the seating-related adaptation and deformation of components of RPD frameworks fabricated by different workflows.</p><p><strong>Materials and methods: </strong>A partially edentulous mandibular arch was used as the master model. Three RPD framework manufacturing workflows were evaluated: the conventional impression making and casting (Imp-Cast) group, conventional impression making and digital fabrication by selective laser melting (Imp-SLM) group, and IOS and digital fabrication (IOS-SLM) group. According to each workflow, 10 frameworks were produced. The virtual superimposition of seated and unseated frameworks was executed to determine component adaptation (retentive arm, reciprocating arm, and occlusal rest) and component deformation (retentive arm and framework body). The 1-way analysis of variance (ANOVA) test was used to determine the differences among the groups (α=.05).</p><p><strong>Results: </strong>No difference in component adaptation was observed for Imp-Cast and Imp-SLM (P>.05), and both were better than IOS-SLM (P<.001). The least retentive arm deformation was observed for Imp-SLM. Imp-Cast and Imp-SLM showed no difference in framework body deformation (P=.92), and both were better than IOS-SLM (P<.05). The IOS-SLM frameworks appeared narrower than the master model.</p><p><strong>Conclusions: </strong>Frameworks fabricated from conventional casts exhibited comparable adaptation of components. In some comparisons, SLM fabrication was associated with less deformation than casting. Frameworks fabricated from IOS had the greatest adaptation error and deformation. As all the frameworks were seated on the master model without adjustment, the clinical relevance of this study's finding is yet to be determined.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143468418","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}
引用次数: 0
Occlusal contact area, occlusal forces, and marginal bone loss around implants supporting overdentures and fixed implant-supported prostheses in patients with an atrophied mandible: A 1-year randomized clinical trial.
IF 4.3 2区 医学
Journal of Prosthetic Dentistry Pub Date : 2025-02-18 DOI: 10.1016/j.prosdent.2025.01.032
Reem M Abdeen, Abd El Rahman Majed, Moustafa Abdou ELsyad, Sahar A Kortam
{"title":"Occlusal contact area, occlusal forces, and marginal bone loss around implants supporting overdentures and fixed implant-supported prostheses in patients with an atrophied mandible: A 1-year randomized clinical trial.","authors":"Reem M Abdeen, Abd El Rahman Majed, Moustafa Abdou ELsyad, Sahar A Kortam","doi":"10.1016/j.prosdent.2025.01.032","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.01.032","url":null,"abstract":"<p><strong>Statement of problem: </strong>Prospective randomized clinical trials evaluating occlusal contact area percentage (OCA%), occlusal maximum force (MF), and marginal bone loss (MBL) around implant-supported bar overdentures compared with implant screw-retained fixed complete prostheses in participants with severely atrophied edentulous mandibles are lacking.</p><p><strong>Purpose: </strong>The purpose of this randomized clinical trial was to assess the OCA%, MF, and vertical MBL around implant-supported bar overdentures (ISBOs) and implant-supported screw-retained fixed complete prostheses (ISFPs) in participants with severely atrophied mandibular ridges.</p><p><strong>Material and methods: </strong>Forty participants with an edentulous atrophied mandible were enrolled, received 4 implants in the interforamina region, and were randomly divided into 2 groups (n=20). Participants in the first group (ISBO) received implant-supported bar overdentures, and those in the second group received implant-supported screw-retained fixed prostheses. The OCA% areas (using digital analysis), maximum force (using a digital occlusal force transducer), and vertical MBL around implants (using periapical radiographs) were evaluated at the insertion time of prostheses and at 6 and 12 months (T0, T6, T12). The normality of the data distribution was assessed using the 1-sample Kolmogorov-Smirnov and Shapiro-Wilk tests. Repeated measures (ANOVA), followed by the test for multiple comparisons (Tukey post hoc), were applied to identify significant differences among observation times and groups (α=.05).</p><p><strong>Results: </strong>For the ISBO group, the highest OCA% was at T12, followed by T6 and T0. For the ISFP group, the highest OCA% was at T0, followed by T6 and T12. The ISBO group recorded a significantly higher OCA% at all observation times than the ISFP group (P<.05). Both groups had the highest maximum force (MF) at T12, followed by T6 and T0. At all observation times, ISFP recorded significantly higher MF than ISBO (P<.05). Vertical MBL significantly increased from T6 to T12 for the 2 groups (P<.05). The ISFP group showed a significantly greater vertical MBL than ISBO at T6 and T12 (P<.05).</p><p><strong>Conclusions: </strong>The ISBO group had a better distribution of occlusal forces with the subsequent preservation of marginal bone-supporting implants than the ISFP group. However, ISBO and ISFP can both be recommended for participants with atrophied mandibular ridges.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458416","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}
引用次数: 0
Digital workflow for fabricating a nasal apex-columella prosthesis with an integrated custom nasal stent.
IF 4.3 2区 医学
Journal of Prosthetic Dentistry Pub Date : 2025-02-15 DOI: 10.1016/j.prosdent.2025.01.018
Manu Rathee, Sarthak Singh Tomar, Deepak Chhabra, Pritish Dixit
{"title":"Digital workflow for fabricating a nasal apex-columella prosthesis with an integrated custom nasal stent.","authors":"Manu Rathee, Sarthak Singh Tomar, Deepak Chhabra, Pritish Dixit","doi":"10.1016/j.prosdent.2025.01.018","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.01.018","url":null,"abstract":"<p><p>This clinical report details the management of an 11-year-old child with significant nasal trauma from a dog bite who required esthetic and functional rehabilitation. Initial treatment included surgical debridement and wound stabilization, followed by a nasal stent to maintain airway patency and prevent soft tissue contracture. A digital workflow incorporating facial scanning, computer-aided design, and 3-dimensional (3D) printing was used to fabricate a custom nasal stent. This approach ensured precise anatomic adaptation and enhanced esthetics through digital sculpting of the nasal apex and columella. The 3D printed stent demonstrated excellent clinical fit, improving both functional and esthetic outcomes. This clinical report emphasizes the benefits of digital workflows and 3D printing in pediatric nasal stent fabrication, providing rapid production and better results compared with traditional methods.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143433359","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}
引用次数: 0
Guided tissue regeneration with a gelatin and polycaprolactone composite membrane for repairing oral soft tissue defects: A prospective, single-blinded, randomized trial.
IF 4.3 2区 医学
Journal of Prosthetic Dentistry Pub Date : 2025-02-14 DOI: 10.1016/j.prosdent.2024.12.030
Hong Tang, Ting Wang, Pan Zhang, Kai Yang
{"title":"Guided tissue regeneration with a gelatin and polycaprolactone composite membrane for repairing oral soft tissue defects: A prospective, single-blinded, randomized trial.","authors":"Hong Tang, Ting Wang, Pan Zhang, Kai Yang","doi":"10.1016/j.prosdent.2024.12.030","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.12.030","url":null,"abstract":"<p><strong>Statement of problem: </strong>Clinical trials comparing outcomes of the guided tissue regeneration membrane (TRM), fabricated from gelatin and polycaprolactone via electronspinning technology, with collagen membrane for repairing oral soft tissue defects are lacking.</p><p><strong>Purpose: </strong>The purpose of this clinical trial was to evaluate the efficacy and safety of TRM compared with collagen membrane in reconstructing oral soft tissue defects.</p><p><strong>Material and methods: </strong>This prospective, single-blinded, randomized, noninferiority trial involved 48 participants with oral lesions who were randomized (1:1) into 2 groups: surgery + TRM or surgery + collagen membrane. The primary endpoint was to establish a noninferiority margin of -10% regarding Grade A healing rates 1 month ±7 days after surgery between groups. Secondary endpoints included instrument performance, Grade A healing rate at 10 ±3 days and 3 months ±7 days after surgery, time to achieve Grade A healing, surgical area satisfaction and wound contraction at 10 ±3 days, 1 month ±7 days, and 3 months ±7 days after surgery. Adverse events were assessed to evaluate the safety of TRM. The independent samples t test was used for continuous variables between groups, and the Fisher exact test or chi-squared test was used for categorical variables (α=.05).</p><p><strong>Results: </strong>The Grade A healing rate was 100% in both groups at 1 month ±7 days after surgery in the full-analysis and per-protocol sets. The 95% confidence interval of the rate difference (0%) was -5% to +5%, within the predefined noninferiority margin of -10%, indicating that TRM was not inferior to collagen membrane. No significant differences in secondary endpoints were found between groups (P>.05). Adverse events rates were also similar between groups (serious adverse events: 3 [12.50%] for TRM and 1 [4.17%] for collagen membrane, P=.609; overall adverse events: 7 [29.17%] for TRM and 4 [16.67%] for collagen membrane, P=.303).</p><p><strong>Conclusions: </strong>TRM demonstrated noninferiority to collagen membrane for reconstructing oral soft tissue defects.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143425651","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}
引用次数: 0
Influence of polymerization protocols on the physical and mechanical properties of a 3D printed resin.
IF 4.3 2区 医学
Journal of Prosthetic Dentistry Pub Date : 2025-02-13 DOI: 10.1016/j.prosdent.2025.01.006
Fabio A P Rizzante, Michael Azzer, Nima G Moghaddam, Thomas Watson, Guilherme F Moura, Adilson Y Furuse
{"title":"Influence of polymerization protocols on the physical and mechanical properties of a 3D printed resin.","authors":"Fabio A P Rizzante, Michael Azzer, Nima G Moghaddam, Thomas Watson, Guilherme F Moura, Adilson Y Furuse","doi":"10.1016/j.prosdent.2025.01.006","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.01.006","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Statement of problem: &lt;/strong&gt;Fast prototyped, or 3-dimensionally (3D) printed, materials enhance clinical efficiency when compared with other manufacturing methods. Nevertheless, standardization and information regarding the influence of different postprocessing protocols on the final physical and mechanical properties of 3D printed parts is lacking.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Purpose: &lt;/strong&gt;The purpose of this in vitro study was to evaluate the effect of different polymerization methods and times on the flexural strength, microhardness, and color stability of a 3D printed resin (OnX; SprintRay).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Material and methods: &lt;/strong&gt;A total of 40 disks (Ø10×2 mm) and 40 bars (10×2×2 mm) were 3D printed, washed, and subdivided into 4 groups (n=10) according to the polymerization protocol: VALO Grand light polymerization unit for 40 and 120 seconds (VG40s andVG120s) and ProCure 2 polymerization chamber for 1 and 2 cycles (PC×1 and PC×2). The bars were stored in distilled water at 37 °C for 24 hours, and a 3-point bend test was performed with a universal testing machine with an 8-mm span and a downward movement at a rate of 0.5 mm/minute until fracture. The disks were polished with abrasive disks. Color stability was assessed after polymerization (baseline), after 1 and 7 days in dark, dry storage at 37 °C, and after 3 days of artificial aging in deionized water at 60 °C. Values of b* were used to calculate yellow shift/Δb* values after 3 days of artificial aging. Microhardness after 7 days in dark, dry storage was assessed with a Knoop indenter. The data were assessed for homogeneity using the Levene test and for normality using the Shapiro-Wilk test. Two-way ANOVA (flexural strength, microhardness, and Δb* tests) and 3-way repeated-measures ANOVA (color stability test) were followed by the Tukey HSD post hoc test (α=.05 for all tests).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Results: &lt;/strong&gt;For microhardness, the polymerization unit (P&lt;.001), polymerization cycles (P=.003), and interaction between both factors (P=.005) were significantly different, with VG40s=VG120s&gt;PC×1&gt;PC×2. For flexural strength, the polymerization unit (P&lt;.001), polymerization cycles (P&lt;.001), and interaction between both factors (P&lt;.001) were significantly different, with VG120s=PC×1=PC×2&gt;VG40s. For color stability, the polymerization unit (P=.009), time (P&lt;.001), and interaction between time and polymerization unit (P&lt;.001) and time, polymerization unit, and cycle (P=.01) were significantly different. After 3 days of artificial aging, PC×1=PC×2&gt;VG40s=VG120s. Significantly different Δb* was found for polymerization unit (P&lt;.001) and polymerization cycles (P=.002), with VG120s&lt;VG40s=PC×2≤PC×1.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Conclusions: &lt;/strong&gt;Resins polymerized using VG120s produced similar or better microhardness, flexural strength, and color stability results than PC while significantly decreasing the postpolymerization time. Specimens polymerized with PC×2 showed the lowest microhardness. Excessively","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143425663","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}
引用次数: 0
Mechanical properties and reliability of an additively manufactured resin incorporated with a commercially available ceramic composite concentrate.
IF 4.3 2区 医学
Journal of Prosthetic Dentistry Pub Date : 2025-02-13 DOI: 10.1016/j.prosdent.2025.01.003
Gabriela Panca Sabatini, Hyung-In Yoon, Gülce Çakmak, Nadin Al-Haj Husain, Burak Yilmaz, Mustafa Borga Dönmez
{"title":"Mechanical properties and reliability of an additively manufactured resin incorporated with a commercially available ceramic composite concentrate.","authors":"Gabriela Panca Sabatini, Hyung-In Yoon, Gülce Çakmak, Nadin Al-Haj Husain, Burak Yilmaz, Mustafa Borga Dönmez","doi":"10.1016/j.prosdent.2025.01.003","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.01.003","url":null,"abstract":"<p><strong>Statement of problem: </strong>A ceramic composite concentrate that can be incorporated into resins used in additive manufacturing to improve their mechanical properties has been recently marketed. However, knowledge on whether this modification enhances the mechanical properties of such resins is lacking.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to evaluate the mechanical properties and reliability of a dental resin used for additive manufacturing incorporated with a commercially available ceramic composite concentrate.</p><p><strong>Material and methods: </strong>Specimens for flexural strength (17×4×1.5 mm, n=12), Vickers hardness (Ø10×1.5 mm, n=16), and fracture toughness (25×5×2.2 mm, n=15) tests were additively manufactured from an urethane acrylate-based resin with no fillers intended for definitive use (AM-D), a composite resin with ceramic fillers intended for definitive use (AM-DC), a resin with no fillers intended for interim use (AM-I), and the AM-I resin reinforced with a commercially available ceramic composite concentrate (AM-IR). The AM-IR resin was obtained by mechanically mixing 30 wt% of the ceramic composite concentrate with 70 wt% of the AM-I resin for 3 hours at 50 °C. Flexural strength and Vickers hardness data were analyzed with the Kruskal-Wallis and Dunn tests, while 1-way analysis of variance and the Tukey honestly significant difference tests were used for the fracture toughness data. Weibull modulus and characteristic strength were evaluated with the chi-squared test (α=.05).</p><p><strong>Results: </strong>Resin type affected tested outcomes (P<.001). AM-DC and AM-IR had significantly higher flexural strength than the other groups (P≤.004). AM-DC also had the highest Vickers hardness among tested resins (P<.001). In terms of fracture toughness, AM-IR had the highest values followed by AM-DC (P≤.010). AM-IR had the highest Weibull modulus, and AM-DC had the highest characteristic strength among tested resins (P≤.019).</p><p><strong>Conclusions: </strong>The resin modified with the ceramic composite concentrate had similar biaxial flexural strength to that of the composite resin with ceramic fillers intended for definitive use along with the highest Weibull modulus and fracture toughness. However, its Vickers hardness was similar to that of resins indicated for interim use.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143425665","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}
引用次数: 0
Reliability, failure mode, and stress distribution in conical connections with different types of retention.
IF 4.3 2区 医学
Journal of Prosthetic Dentistry Pub Date : 2025-02-12 DOI: 10.1016/j.prosdent.2025.01.013
Michele Costa de Oliveira Ribeiro, Vanessa Felipe Vargas-Moreno, Rafael Soares Gomes, Edmara Tatiely Pedroso Bergamo, Estevam Augusto Bonfante, Altair Antoninha Del Bel Cury, Raissa Micaella Marcello-Machado
{"title":"Reliability, failure mode, and stress distribution in conical connections with different types of retention.","authors":"Michele Costa de Oliveira Ribeiro, Vanessa Felipe Vargas-Moreno, Rafael Soares Gomes, Edmara Tatiely Pedroso Bergamo, Estevam Augusto Bonfante, Altair Antoninha Del Bel Cury, Raissa Micaella Marcello-Machado","doi":"10.1016/j.prosdent.2025.01.013","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.01.013","url":null,"abstract":"<p><strong>Statement of problem: </strong>The tapered interference fit (TIF) implant system, a screwless system with purely frictional retention, was developed to minimize prosthetic complications associated with screw loosening. However, evidence regarding its biomechanical behavior is scarce.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to compare the reliability, failure mode, and stress distribution of frictional TIF implant systems with straight and custom in-office angled abutments and conventional taper integrated screw-in (TIS) systems.</p><p><strong>Material and methods: </strong>One hundred and five implants with single crowns were divided into 5 groups (n=21) according to the type of retention (TIF or TIS) and angulation of the abutment, straight (S) or angled (A): straight universal abutment (TIF); 17-degree angled abutment (TIF-A); straight universal abutment (TIS); 17-degree angled abutment (TIS-A); and straight abutment with passing screw (TIS-P). The reliability was assessed by step-stress accelerated life testing (SSALT) (n=21). The failure mode was investigated using fractographic analysis. Finite element analysis (FEA) was performed to analyze stress distribution. The von Mises stress (σvM) and displacement were assessed for implant and abutment, while shear stress (τmax) and minimum principal stress (σmin) were evaluated for cortical and cancellous bone.</p><p><strong>Results: </strong>All groups presented high reliability at a load of 100 N. The TIS-P (93%) showed lower reliability than the TIF and TIS-A (99%) groups. However, with the increase of load to 150 N, the reliability of the TIS (60%), TIS-P (82%), and TIF-A (81%) groups decreased. No changes were observed for TIF and TIS-A. All specimens failed by fracture after SSALT, with failures restricted to the transmucosal area of the abutment. FEA showed an increase in σvM of at least 60% in the abutment for the TIF groups, while a reduction of 64% was observed in the implant. The displacement was greater for TIF (54.36 mm) in the abutment and higher for TIS-P (6.97 µm) in the implant. Also, the TIF and TIF-A groups exhibited better cortical and cancellous bone stress distribution.</p><p><strong>Conclusions: </strong>The TIF systems can be safely indicated for implant-supported prostheses in the anterior region because of their high reliability and excellent stress distribution to the bone. Custom in-office angulation may decrease reliability, suggesting a preference TIS systems.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143414343","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}
引用次数: 0
Can researchers attract serendipity?
IF 4.3 2区 医学
Journal of Prosthetic Dentistry Pub Date : 2025-02-10 DOI: 10.1016/j.prosdent.2025.01.021
Steven J Sadowsky
{"title":"Can researchers attract serendipity?","authors":"Steven J Sadowsky","doi":"10.1016/j.prosdent.2025.01.021","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.01.021","url":null,"abstract":"","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143399420","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}
引用次数: 0
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