Journal of Prosthetic Dentistry最新文献

{"title":"Facial morphological changes following complete mouth rehabilitation with implant-supported fixed dental prostheses designed using digital virtual patients: A pilot study","authors":"Danni Guo DDS, PhD ,&nbsp;Shenghan Gao DDS ,&nbsp;Shaoxia Pan DDS, PhD ,&nbsp;Yongsheng Zhou DDS, PhD","doi":"10.1016/j.prosdent.2025.05.010","DOIUrl":"10.1016/j.prosdent.2025.05.010","url":null,"abstract":"<div><h3>Statement of problem</h3><div><span>Complete mouth rehabilitation with implant-supported fixed </span>dental prostheses (ISFDPs) has become a common treatment option. The application of a virtual patient in complete mouth rehabilitation is believed to have considerable promise. However, studies reporting the facial morphological changes after complete mouth rehabilitation with ISFDPs designed using virtual patients are lacking.</div></div><div><h3>Purpose</h3><div>The purpose of this pilot clinical study was to evaluate the facial morphological changes after rehabilitation with complete arch ISFDPs designed using virtual patients.</div></div><div><h3>Material and methods</h3><div>Eight completely edentulous patients received implant surgery and a complete arch ISFDP. Facial scanning was performed at 3 time points: initial examination (FS1), after jaw relationship recording (FS2), and after prosthesis delivery (FS3). The ISFDPs were fabricated based on virtual patients constructed using FS2 data. FS1 was compared with FS3 to evaluate the facial morphological changes before and after complete mouth rehabilitation with an ISFDP. The root mean square (RMS) of the following segmented regions were recorded: right buccal, left buccal, right paranasal, left paranasal, upper lip, and lower lip. The linear deviation of the labrale superius and the changes in the nasolabial angle were also measured. The Kruskal-Wallis H test was used to test the difference in the morphological changes among the segmented facial regions (α=.05).</div></div><div><h3>Results</h3><div>Between FS1 and FS3, significantly more morphological change was found in the upper lip region [(3.23, 2.62/3.86) mm] than in the other perioral regions (<em>P</em>=.012). The lower thirds of the upper lip [(3.40, 2.54/4.22) mm] showed significantly more change than the middle [(1.97, 1.07/2.61) mm] and upper thirds [(1.13, 0.90/1.50) mm] (<em>P</em>&lt;.001). The linear deviation of the labrale superius was (3.18, 2.53/3.60) mm. The change in nasolabial angle was (6.48, 4.00/9.51) degrees.</div></div><div><h3>Conclusions</h3><div>After complete mouth rehabilitation with an ISFDP designed using a virtual patient, the facial morphological change in the upper lip region was greater than in the other segmented facial regions. The lower thirds of the upper lip showed the greatest change.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 3","pages":"Pages 553-560"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144248433","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":"Influence of material, design, and patient factors on long-term outcomes of anterior fixed dental prostheses: A retrospective clinical study","authors":"Ali Alenezi BDS, MDS, PhD ,&nbsp;Hanin Alsalhi BDS, SBE","doi":"10.1016/j.prosdent.2025.10.033","DOIUrl":"10.1016/j.prosdent.2025.10.033","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Anterior fixed dental prostheses must not only bear functional loads but also meet high esthetic standards, as they influence speech and facial appearance. Studies on their long-term clinical outcomes are sparse.</div></div><div><h3>Purpose</h3><div>The purpose of this retrospective clinical study was to investigate the long-term survival rates of fixed prostheses, including veneers, crowns, and fixed partial dentures (FPDs), in the anterior region.</div></div><div><h3>Material and methods</h3><div>Standardized clinical and radiographic examinations were performed by 2 clinicians on participants with fixed prostheses during their follow-up visit to detect any biological or technical complications. The complication-free survival of the evaluated fixed prostheses was evaluated using the Kaplan-Meier survival analysis method. Cox regression analyses were used to assess the association between the covariates and complications rates. In addition, life table analysis was used to estimate the cumulative survival rate of fixed prostheses in the presence of complications (α=.05).</div></div><div><h3>Results</h3><div>The study assessed 569 fixed prostheses over a mean follow-up period of 7.57 ±6.02 years. The overall complication rate was 40.4%, comprising 30.9% biological complications and 13.4% technical complications. Splinted crowns and conventional FPDs were associated with the highest total complication rates (75.0% and 67.6%, respectively), whereas veneers and cantilever FPDs exhibited lower (29.1% and 28.6%, respectively) complication rates. Sex and arch location were not significantly associated with complication risk (<em>P</em>&gt;.05). Poor oral hygiene was associated with increased complication risk (<em>P</em>&lt;.001), and implant-supported fixed prostheses demonstrated a lower hazard of complications than tooth-supported fixed prostheses (HR=0.122, 95% CI: 0.029 to 0.515, <em>P</em>&lt;.001). No significant material-type effect was detected: zirconia (HR=2.276; 95% CI, 0.973 to 5.324; <em>P</em>=.058) and metal-ceramic (HR=0.686; 95% CI, 0.457 to 1.031; <em>P</em>=.070).</div></div><div><h3>Conclusions</h3><div>The long-term success of anterior fixed prostheses can be significantly influenced by a combination of clinical, material, and patient-related factors.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 3","pages":"Pages 552.e1-552.e8"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145426932","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 viewing angle and activation speed of various torque wrenches: A comparative evaluation of accuracy and repeatability","authors":"Ekin Yaylaci DDS ,&nbsp;Beril Koyuncu DDS, PhD ,&nbsp;Ovul Kumbuloglu DDS, PhD","doi":"10.1016/j.prosdent.2025.10.012","DOIUrl":"10.1016/j.prosdent.2025.10.012","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The loosening of abutments is one of the most frequent complications of implant-supported restorations.</div></div><div><h3>Purpose</h3><div>The purpose of this study was to compare the accuracy and performance of different dental torque wrenches in achieving the target torque values.</div></div><div><h3>Material and methods</h3><div>A spring-type (NTA Implant; Pilatus Swiss Dental GmbH), friction-type (NTA Implant; Pilatus Swiss Dental GmbH), and single-value torque wrench (Dentsply Sirona) were used. The implants included 4 NTA implants (Ø4.2×10 mm) (NTA Implant; Pilatus Swiss Dental GmbH) and 1 Frialit implant (Ø4.5×13 mm) (XiVE; Dentsply Sirona) with corresponding standard cement-retained abutments. Torque measurements were recorded using a digital torque gauge (MTT03–12; Mark-10 Co.), and torque was measured at different viewing angles using a digital angle finder (Neoteck). A total of 339 torque applications were made, including 9 torques per time-dependent and independent experimental group and 50 torques per clinician’s viewing angle experimental group.</div></div><div><h3>Results</h3><div>In time-independent tests, the friction-type torque wrench (Type B) generated the highest mean ±standard deviation torque value (32.1 ±0.9 Ncm), while the single-torque-value wrench (Type C) produced the lowest mean ±standard deviation torque value (23.5 ±0.4 Ncm). In time-dependent tests, the mean torque values generated during slow torque application (&gt;4 seconds) were higher than those generated during fast torque application (1 to 4 seconds). Regarding the clinician’s viewing-angle evaluation, the spring-type wrench (Type A) produced the highest torque values at 90 degrees, moderate values at 60 degrees, and the lowest at 30 degrees.</div></div><div><h3>Conclusions</h3><div>Torque application conditions, such as speed and angle, significantly influenced measurement accuracy. The friction-type wrench produced the highest torque values, whereas the spring-type wrench exhibited greater repeatability. All mean torque values were within ±10% of the target values. To achieve the best results when using spring-type wrenches, the clinician’s viewing angle should be 90 degrees. In clinical applications, the adverse effects of rapid torque tightening and angle variations on accuracy should be considered. These results provided insight into the selection of devices and protocols for accurate torque application for dental implants.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 3","pages":"Pages 584.e1-584.e7"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145422021","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":"Quality of life assessment in patients with a unilateral orbital defect provided with an interim prosthetic rehabilitation: A randomized crossover clinical trial","authors":"Ahmed K. Farrag BDS, MSc ,&nbsp;Mohamed Sherine El Attar BDS, MSc, PhD ,&nbsp;Kuldeep Raizada BCO, BADO ,&nbsp;Mohamed Fata BDS, MSc, PhD ,&nbsp;Hams Abdelrahman BDS, MSc, PhD ,&nbsp;Ingy S. Soliman BDS, MSc, PhD","doi":"10.1016/j.prosdent.2025.04.034","DOIUrl":"10.1016/j.prosdent.2025.04.034","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The lack of interim prostheses for unilateral orbital defects has a dramatic impact on quality of life<span> and aggravates patient anxiety and depression. However, quality of life assessment and patient satisfaction studies for different interim options are lacking.</span></div></div><div><h3>Purpose</h3><div>The purpose of this study was to assess patient quality of life (QoL), anxiety, and satisfaction using newly designed custom-made eyeglasses compared with conventional eye patches and sunglasses.</div></div><div><h3>Material and methods</h3><div><span>Twenty patients with unilateral orbital defects were included in a randomized crossover clinical trial. Patients received the 3 interim prosthetic options: an eye patch, sunglasses, and the newly designed 3-dimensionally custom-made eyeglasses for 2 months with a 1-week washout period. Assessment questionnaires for patient QoL and satisfaction as well as anxiety measures were performed using WHO QOL-BREF, SF-12, GAD-7, and the Sloan Questionnaire. Mean scores for interim prosthetic options were compared with the Shapiro-Wilk test, </span>Friedman test<span>, Wilcoxon signed-rank test, and McNemar test (α=.05).</span></div></div><div><h3>Results</h3><div>The custom-made eyeglasses significantly improved scores across all domains of WHO QOL-BREF compared with eye patches and sunglasses, and, according to SF-12 and the GAD-7 questionnaire, there was a reduction in anxiety levels. Satisfaction scores using the Sloan Questionnaire were highest for the custom-made eyeglasses, with patients rating them superior in appearance, comfort, and usability.</div></div><div><h3>Conclusions</h3><div>The use of newly designed, custom-made eyeglasses is an alternative interim option that offers significant improvement in quality of life, satisfaction, and anxiety measures.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 3","pages":"Pages 632-642"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144094148","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":"Techniques and accuracy for aligning facial and intraoral digital scans to integrate a 3-dimensional virtual patient: A systematic review","authors":"Ghida Lawand BDS, MSc ,&nbsp;Hani Tohme DDS, MSc, PhD ,&nbsp;Luis Azevedo DMD, MSc, PhD ,&nbsp;William Martin DMD, MS ,&nbsp;Luiz Gonzaga DDS, MS ,&nbsp;Maryse Nassif DDS ,&nbsp;Marta Revilla-León DDS, MSD, PhD","doi":"10.1016/j.prosdent.2025.04.017","DOIUrl":"10.1016/j.prosdent.2025.04.017","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The optimal method of aligning intraoral scans with facial scans to generate a 3-dimensional (3D) virtual patient remains unclear. Distortions in the alignment of intraoral and facial scans would lead to an inadequate virtual patient representation and, therefore, to inadequate diagnosis and treatment planning.</div></div><div><h3>Purpose</h3><div>The purpose of this systematic review was to evaluate the available techniques for generating a 3D virtual patient by aligning facial and intraoral scans and to assess their accuracy.</div></div><div><h3>Material and methods</h3><div>A systematic search was conducted in 3 databases: Medline, Scopus, and Web of Science. A manual search was also conducted. Specific descriptors were used to identify alignment techniques. Two independent reviewers screened titles and abstracts, with a third independent reviewer resolving ambiguities. A qualitative analysis was performed, and interexaminer agreement was assessed using the Cohen kappa statistic.</div></div><div><h3>Results</h3><div>After screening, 48 of the 2832 identified articles were included for qualitative analysis. They focused on 3 alignment techniques: guided by retracted facial scans, extraoral scan bodies, and perioral intraoral scans. Interexaminer agreement was high (kappa=0.82 to 0.88). Integration techniques guided by extraoral scan bodies, influenced by extraoral scan body design and protocols, showed the best accuracy. The outcome variables for the evaluation of the effectiveness of these protocols were heterogeneous.</div></div><div><h3>Conclusions</h3><div>Integrating facial and intraoral scans was found to enhance diagnosis and treatment planning by providing essential esthetic and functional parameters. Integration techniques guided by extraoral scan bodies and combination techniques showed higher accuracy, especially for complex implant-supported prostheses or edentulous patients.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 3","pages":"Pages 484-504"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144015659","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":"Factors leading to implant failure: An umbrella review of meta-analyses of observational studies and trials","authors":"Koay Chun Giok BDS ,&nbsp;Sajesh K. Veettil PhD ,&nbsp;Chen-Xuan Wei PhD ,&nbsp;Rohit Kunnath Menon PhD","doi":"10.1016/j.prosdent.2025.04.041","DOIUrl":"10.1016/j.prosdent.2025.04.041","url":null,"abstract":"&lt;div&gt;&lt;h3&gt;Statement of problem&lt;/h3&gt;&lt;div&gt;&lt;span&gt;The evidence concerning factors leading to implant failure remains inconclusive. Existing &lt;/span&gt;systematic reviews have reported mixed results for patient-related, surgical, and prosthetic factors contributing to implant failure.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Purpose&lt;/h3&gt;&lt;div&gt;The purpose of this umbrella review&lt;span&gt; was to summarize the evidence and assess existing biases from meta-analyses of randomized controlled trials (RCTs) and observational (cohort and case-control) studies to establish clinically relevant factors associated with implant failure.&lt;/span&gt;&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Material and methods&lt;/h3&gt;&lt;div&gt;The study had been registered with the International Prospective Register of Systematic Reviews (PROSPERO) (CRD42025634487). The Scopus, PubMed, the Cochrane Database of Systematic Reviews, and Epistemonikos databases were searched from inception until June 2024, and the effect sizes were recalculated using a random-effects model for each meta-analysis. Between-study heterogeneity, 95% prediction interval, small-study effects, excess significance, and credibility ceilings were evaluated. The credibility of evidence from meta-analyses of cohort and case-control studies was ranked by established criteria as nonsignificant, weak, suggestive, highly suggestive, or convincing.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Results&lt;/h3&gt;&lt;div&gt;A total of 2922 publications were identified, 224 full-texts were evaluated, and 25 articles describing 35 associations were included in the study. Among meta-analyses of RCTs (n=9), 6 (67%) statistically significant associations were identified (&lt;em&gt;P&lt;/em&gt;&lt;span&gt;&lt;.05). According to the GRADE assessment, turned versus anodized implants, submerged versus nonsubmerged implant healing, and bone augmentation with long implants versus short implants were associated with a higher risk of implant failure (high certainty evidence). Short implants (&lt;10 mm) versus long implants (&gt;10 mm) and immediate versus delayed implant placement were associated with higher risk for implant failure (moderate certainty evidence). Among the meta-analyses of cohort and case-control studies (n=26), 18 (69%) associations were statistically significant (&lt;/span&gt;&lt;em&gt;P&lt;/em&gt;&lt;span&gt;&lt;.05). None were graded as convincing. Highly suggestive evidence was established for the association between smoking and implant failure. Suggestive evidence emerged for associations including periodontally compromised versus periodontally healthy patients, proton pump inhibitor therapy, Crohn’s disease, bone quality type II versus type IV, bone quality type III versus type IV, nonsubmerged immediately loaded versus submerged delayed loaded implants, short implants (&lt;10 mm) versus long implants (&gt;10 mm), selective serotonin re-uptake inhibitor therapy, turned versus anodized implants, and immediately loaded versus conventionally loaded implants. These findings remained robust after sensitivity analyses.&lt;/span&gt;&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Conclusions&lt;","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 3","pages":"Pages 518-527"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144159698","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 pick-up material and hole diameter on the flexural strength of milled polymethyl methacrylate complete arch implant-supported interim prostheses","authors":"Maryse Nassif DDS ,&nbsp;Ghida Lawand BDS, MSc ,&nbsp;Marta Revilla-León DDS, MSD, PhD ,&nbsp;Georges Najjar DDS, MSc ,&nbsp;Ryan Harouny DDS, MSc ,&nbsp;Adam Saleh DDS ,&nbsp;Hani Tohme DDS, MSc, PhD","doi":"10.1016/j.prosdent.2025.10.002","DOIUrl":"10.1016/j.prosdent.2025.10.002","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Milled polymethyl methacrylate (PMMA) has been widely used to fabricate complete arch immediate implant-supported fixed interim prostheses. However, the effect of the pick-up material and hole diameter of the restoration on its flexural strength and failure mode remains unclear.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to assess the impact of the pick-up material and hole diameter of the interim restoration on the flexural strength and failure mode of milled complete arch immediate implant-supported interim restorations.</div></div><div><h3>Material and methods</h3><div>A master model block simulating an edentulous ridge with implants was designed and printed in cobalt chromium, and 2 implant screw-retained abutment analogs were embedded in the block. A bar simulating the implant-supported fixed prosthesis was designed. A total of 64 PMMA bars (21.5×10×8 mm) were milled and divided into 2 groups based on capture hole diameter (4.8 or 5.8 mm) and 4 subgroups based on pick-up material: autopolymerizing PMMA (Unifast Trad Ivory) (aPMMA group) (n=16), autopolymerizing resin (Quick Up) (aRES group) (n=16), dual-polymerizing PMMA resin (Stellar DC Acrylic) (dPMMA group) (n=16), or flowable light-polymerizing composite resin (Filtek Bulk Fill Flowable) (bfRES group) (n=16). The bar specimens were screwed into the abutment analogs and subjected to 3-point bending in a universal testing machine. Flexural strength was calculated, and failure mode was assessed. Flexural strength data was analyzed using a 2-way ANOVA with Bonferroni post hoc tests (α=.05). Failure mode was evaluated with the Fisher exact test.</div></div><div><h3>Results</h3><div>Flexural strength was significantly influenced by both the pick-up material and capture hole diameter (<em>P</em>=.001). The aPMMA (<em>P</em>&lt;.001) subgroup showed higher flexural strength across diameters, while the performance of bfRES (<em>P</em>=.001) and dPMMA (<em>P</em>&lt;.001) was reduced at 5.8 mm. The aPMMA subgroup primarily failed cohesively, while dPMMA showed predominantly adhesive failures. Larger coping capture hole diameters led to a significant increase in adhesive failures (<em>P</em>=.008).</div></div><div><h3>Conclusions</h3><div>The pick-up material and coping capture hole diameter were found to affect the flexural strength of milled PMMA interim implant-supported prosthesis. Autopolymerizing PMMA demonstrated higher mechanical properties and more favorable failure patterns.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 3","pages":"Pages 564.e1-564.e9"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145313102","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":"Influence of artificial intelligence-based registration and occlusal collision correction on the accuracy of occlusal contacts captured at maximum intercuspal position using an intraoral scanner: A clinical comparative study","authors":"Panagiotis Ntovas DDS, MSc, ,&nbsp;Konstantinos Vazouras DDS, DMD, MDSc ,&nbsp;Abdul B. Barmak MD, MSc, EdD ,&nbsp;Wael Att ,&nbsp;Marta Revilla-León DDS, MSD, PhD","doi":"10.1016/j.prosdent.2025.10.028","DOIUrl":"10.1016/j.prosdent.2025.10.028","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Artificial intelligence (AI)-driven programs and occlusal collision correction algorithms have been proposed to improve the accuracy of articulating intraoral scans in maximum intercuspal position (MIP). However, the effect of each post-processing method on the accuracy of the MIP relationship remains unclear.</div></div><div><h3>Purpose</h3><div>The purpose of this clinical comparative study was to assess the influence of occlusal collision correction method and AI-driven registration on the accuracy of occlusal contacts recorded in MIP using an intraoral scanner (IOS).</div></div><div><h3>Material and methods</h3><div>Occlusal contacts in MIP were recorded using articulating film in 46 participants and digitized using maxillary and mandibular scans captured with an IOS (TRIOS 4; 3Shape A/S). For each participant, a bilateral virtual occlusal record was generated in MIP. The scans were duplicated and assigned to 3 groups: non-articulated (NA), IOS-non-corrected (INC), and IOS-corrected (IC). Using a computer-aided design (CAD) software program (Elefsina 3.2; exocad GmbH) the INC and the IC scans were post-processed implementing 3 different methods: Cast trimming (CT) and increasing vertical dimension either by moving the jaws apart (IVDM) or by opening articulator’s incisal pin (IVDA). An AI-driven software program (Bite-Finder) was also used to post-process both the INC and IC scans. The same AI program was also used to articulate the NA scans in MIP, generating the NA-AI group. Occlusal contact accuracy was assessed by 2 calibrated examiners, using the digitized articulating film contacts as reference. One-way ANOVA was used to examine if average True positive contacts and false positive contacts were different across the post-processing methods (<em>P</em>&lt;.05).</div></div><div><h3>Results</h3><div>Significant differences were observed in both the proportion of true positive contacts and the mean number of false positive contacts among the evaluated groups (<em>P</em>&lt;.05). The IC demonstrated a higher proportion of true positive contacts compared to the INC, but also exhibited a higher mean number of false positives (<em>P</em>&lt;.05). The highest proportions of true positive contacts were found in the AI-registered groups (NA-AI, INC-AI, IC-AI) and the IOS-corrected groups (IC, IC-CT). AI-registered groups showed significantly fewer false positive contacts compared to their counterparts without CAD-based post-processing (IC, INC).</div></div><div><h3>Conclusions</h3><div>Both occlusal collision correction via IOS or a CAD software program and AI-based registration significantly influenced the accuracy of occlusal contact representation in MIP. The choice of occlusal correction method affected the rate of true and false positive contacts.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 3","pages":"Pages 611.e1-611.e9"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145431660","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":"Original versus nonoriginal abutment-implant connection: An in vitro analysis of internal accuracy, reverse torque, and mechanical outcomes","authors":"Jingyao Gong MDS ,&nbsp;Yun Zhu DDS, MD ,&nbsp;Yangbo Xu MD ,&nbsp;Fuming He DDS, MD","doi":"10.1016/j.prosdent.2025.10.030","DOIUrl":"10.1016/j.prosdent.2025.10.030","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Using nonoriginal abutments compatible with dental implants has become increasingly common. However, with subtle differences in structures and materials, the long-term reliability of nonoriginal components is still a concern.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate the micromorphology, internal accuracy, reverse torque, and mechanical properties of 3 nonoriginal and 1 original abutment-implant connections.</div></div><div><h3>Material and methods</h3><div>Three brands of nonoriginal abutments (Bioconcept, Bai; Denfec, Gao; and Kerunxi, Ke) and the original abutment (Straumann, ITI) were connected to primitive internal CrossFit connection implants. The elemental composition and surface topography of abutments were analyzed. Cyclic loading was applied to mimic long-term clinical use. The reverse torque value (RTV) was measured in pre-fatigue (RTV1) and post-fatigue (RTV2) specimens. Longitudinally sectioned specimens were used to assess internal accuracy. Post-fatigue fracture strength was tested via uniaxial compression. Statistical analysis was performed using the 1-sample <em>t</em> test, Mann-Whitney <em>U</em> test, Welch ANOVA test, Kruskal-Wallis test, 2-way ANOVA test, or Aligned Rank Transform (ART) ANOVA test (α=.05).</div></div><div><h3>Results</h3><div>Elemental composition and surface topography differed among groups. No significant intergroup difference in RTV1 was found (<em>P</em>&gt;.05). RTV2 decreased in every group compared with the applied torque value but was higher in Gao than in ITI (<em>P</em>=.002) and Ke (<em>P</em>=.017). Screw jamming was observed in Gao and Ke. All groups showed an extremely high tight contact rate in the platform area. Nonoriginal abutments demonstrated comparable with or higher post-fatigue fracture strength than the original component.</div></div><div><h3>Conclusions</h3><div>The tested nonoriginal abutments achieved essentially similar performance to that of the original ones in terms of internal accuracy, RTV, and mechanical properties, suggesting clinical suitability. However, differences existed in elemental composition and surface morphology. Screw jamming was also observed in nonoriginal abutments after fatigue. The selection of nonoriginal abutments still requires careful consideration.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 3","pages":"Pages 582.e1-582.e8"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145431679","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 a calibration method based on cone beam computed tomography and intraoral scanner data registration for robot-assisted implant placement: A single arm clinical study","authors":"Yi Li BS ,&nbsp;Mingyue Liu BS ,&nbsp;Jianguo Tan DDS, PhD ,&nbsp;Dr Xiaoqiang Liu DDS, PhD","doi":"10.1016/j.prosdent.2025.10.017","DOIUrl":"10.1016/j.prosdent.2025.10.017","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Robotic computer assisted implant surgery (r-CAIS) has evolved rapidly because of its enhanced precision and efficiency. Intraoperative patient positioning calibration is critical for ensuring r-CAIS accuracy. A calibration method based on cone beam computed tomography (CBCT) and intraoral scanner (IOS) data registration for robot-assisted implant placement has been proposed previously, and its accuracy validated in vitro; however, its in vivo performance remains unclear.</div></div><div><h3>Purpose</h3><div>This single arm clinical study aimed to evaluate the clinical feasibility and accuracy of calibrating r-CAIS through CBCT and IOS data registration.</div></div><div><h3>Material and methods</h3><div>Ten participants with partial edentulism (1 to 3 missing teeth) were enrolled for robotic implant placement. A preoperative surgical plan was performed based on the CBCT scans. During implant surgery, the participant was scanned with an IOS, with patient positioning calibration accomplished through CBCT and IOS data registration. Implants were subsequently placed automatically via the robotic system according to the preoperative plan. Two weeks postoperatively, CBCT scans were obtained, and deviations between the planned and actual implant positions were measured by superimposing preoperative and postoperative CBCT data by using the robotic software program. The Shapiro-Wilk test was conducted to evaluate the normality of data. Quantitative variables were expressed as mean ±standard deviation, 95% confidence interval (CI), maximum, and minimum.</div></div><div><h3>Results</h3><div>Fifteen implants were autonomously placed in 10 participants by using r-CAIS technology. No intraoperative adverse events or postoperative complications occurred. By using the CBCT and IOS data registration approach, the autonomous robotic system achieved a mean ±standard deviation angular deviation of 1.46 ±0.48 degrees (95% CI: 1.23 to 1.71 degrees), with 3-dimensional deviations of 0.77 ±0.21 mm (95% CI: 0.65 to 0.87 mm) and 0.72 ±0.24 mm (95% CI: 0.61 to 0.84 mm) at the implant platform and apex, respectively.</div></div><div><h3>Conclusions</h3><div>The CBCT and IOS data registration method for calibrating r-CAIS demonstrated clinically acceptable feasibility and accuracy in partially edentulous participants.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 3","pages":"Pages 562.e1-562.e9"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145401323","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}