Journal of Prosthetic Dentistry最新文献

{"title":"Readability and performance of AI chatbot responses to frequently asked questions in maxillofacial prosthodontics","authors":"Soni Prasad BDS, MS, MBA ,&nbsp;Merve Koseoglu DDS ,&nbsp;Stavroula Antonopoulou DDS, MS ,&nbsp;Leila M. Sears DMD, MDS ,&nbsp;Vinsensia Launardo DDS, MS ,&nbsp;Nina Ariani DDS, PhD ,&nbsp;Nadine Ziad Mirza DDS, MDSc ,&nbsp;Amanda Colebeck DDS, MS ,&nbsp;Banu Karayazgan DDS, PhD ,&nbsp;Maribeth Krzesinski DDS ,&nbsp;Alvin G. Wee DDS, BDS, MS, MPH, PhD ,&nbsp;Cortino Sukotjo DDS, PhD, MMSc, MHPE","doi":"10.1016/j.prosdent.2025.09.009","DOIUrl":"10.1016/j.prosdent.2025.09.009","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Patients seeking information about maxillofacial prosthodontic care increasingly turn to artificial intelligence (AI)-driven chatbots for guidance. However, the readability, accuracy, and clarity of these AI-generated responses have not been adequately evaluated within the context of maxillofacial prosthodontics.</div></div><div><h3>Purpose</h3><div>The purpose of this study was to assess and compare the readability and performance of chatbot-generated responses to frequently asked questions about intraoral and extraoral maxillofacial prosthodontics.</div></div><div><h3>Material and methods</h3><div>A total of 20 frequently asked intraoral and extraoral questions were collected from 7 maxillofacial prosthodontists. These questions were submitted to 4 AI chatbots: ChatGPT, Gemini, Copilot, and DeepSeek. A total of 80 responses were evaluated. Readability was assessed using the Flesch-Kincaid Grade Level (FKGL). Seven maxillofacial prosthodontists were calibrated to score the chatbot responses on 5 domains, relevance, clarity, depth, focus, and coherence, using a 5-point scale. The obtained data were analyzed using 2-way ANOVA with post hoc Tukey tests, Pearson correlation analyses, and intraclass correlation coefficients (ICCs) (α=.05).</div></div><div><h3>Results</h3><div>FKGL scores differed significantly among chatbots (<em>P</em>=.002). DeepSeek had the lowest FKGL, indicating better readability, while ChatGPT had the highest. Word counts, relevance, clarity, content depth, focus, and coherence varied significantly among platforms (<em>P</em>&lt;.005). ChatGPT, Gemini, and DeepSeek consistently scored higher, while Copilot had the lowest scores across all domains. For questions on intraoral prostheses, FKGL scores negatively correlated with word count (<em>P</em>=.013). For questions on extraoral prostheses, word count positively correlated with all qualitative metrics except for FKGL (<em>P</em>&lt;.005).</div></div><div><h3>Conclusions</h3><div>Significant differences were found in both readability and response quality among commonly used AI chatbots. Although the DeepSeek and ChatGPT platforms produced higher-quality content, none consistently met health literacy guidelines. Clinician oversight is essential when using AI-generated materials to answer frequently asked questions by patients requiring maxillofacial prosthodontic care.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 1","pages":"Pages 195.e1-195.e9"},"PeriodicalIF":4.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145181989","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":"Fracture strength of additively manufactured implant-supported resin-based crowns on polyetheretherketone and titanium abutments","authors":"Doğu Ömür Dede DDS, PhD ,&nbsp;Mustafa Borga Dönmez DDS, PhD ,&nbsp;Gülce Çakmak Dr med dent, DDS, PhD ,&nbsp;Ahmet Serkan Küçükekenci DDS, PhD ,&nbsp;Burak Yilmaz DDS, PhD","doi":"10.1016/j.prosdent.2025.08.036","DOIUrl":"10.1016/j.prosdent.2025.08.036","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Implant-supported crowns can be fabricated using additive (AM) or subtractive manufacturing (SM) with resin-based materials. However, their fracture strength on different implant abutments remains unclear.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate the fracture strength (FS) and failure modes of AM interim crowns cemented on polyetheretherketone (PEEK) or titanium (Ti) abutments and compare them with SM crowns.</div></div><div><h3>Material and methods</h3><div>Sixty-four implant-supported crowns were fabricated from 3 AM resins (Crowntec [AM_CT], FREEPRINT temp [AM_FP], Varseosmile Crown Plus [AM_VS]) and one SM resin (M-PM Disc [SM_MPM]) (<em>N</em>=16). The crowns were cemented on 1-piece PEEK or Ti abutments (<em>n</em>=8) using dual-polymerizing self-adhesive resin cement after standardized surface treatments. All specimens were subjected to thermomechanical aging (5000 thermal cycles, 250 000 cycles at 49 N, 1.7 Hz) followed by FS testing. Failures were classified as repairable crown crack or fracture, catastrophic crown fracture without abutment damage, abutment distortion without crown damage, or crown and abutment damage. One-way analysis of variance with Tukey test and chi-squared test were used for statistical analysis (α=.05).</div></div><div><h3>Results</h3><div>All specimens survived cyclic loading. While Ti-supported crowns fractured consistently through catastrophic crown failure without abutment damage, most PEEK-supported crowns exhibited inconsistent failure patterns involving abutment distortion or combined crown-abutment damage. Only 6 crowns on PEEK abutments (4 AM_CT and 2 AM_FP) failed without abutment damage, making statistical comparison unreliable. Therefore, PEEK-supported crowns were excluded from statistical analysis. Among Ti groups, SM_MPM crowns demonstrated the highest FS, followed by AM_CT, while AM_FP and AM_VS showed significantly lower FS values (<em>P</em>≤.003). The distribution of failure modes differed significantly among crown materials, abutment types, and their combinations (<em>P</em>≤.014).</div></div><div><h3>Conclusions</h3><div>Crowns on Ti abutments fractured without abutment damage, with SM_MPM resulting in the highest FS, followed by AM_CT. In contrast, most PEEK-supported crowns exhibited abutment distortion without crown damage or simultaneous crown and abutment damage.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 1","pages":"Pages 106.e1-106.e8"},"PeriodicalIF":4.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145113530","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":"Enhancing bonding and durability of polyaryletherketone (PAEK) restorations with nonthermal plasma activation and monomer-based priming","authors":"Szu-Yu Lai CDT, BS ,&nbsp;Chenxuan Wei DDS, PhD ,&nbsp;Tzu-Yu Peng CDT, PhD","doi":"10.1016/j.prosdent.2025.08.029","DOIUrl":"10.1016/j.prosdent.2025.08.029","url":null,"abstract":"<div><h3>Statement of problem</h3><div>While valued for their durability in dental prosthetics, polyaryletherketone (PAEK) materials, known for their chemical inertness and low surface energy, pose significant challenges in achieving durable adhesion to resin cements, a critical factor for the long-term success of dental restorations.</div></div><div><h3>Purpose</h3><div>This study evaluates the novel application of a methyl methacrylate-urethane dimethacrylate (MMA-UDMA) bonding primer following handheld nonthermal plasma (HNP) treatment to enhance the bonding performance and aging durability of PAEK materials with varying microfiller compositions, addressing the persistent challenge of achieving long-term adhesion in dental restorations.</div></div><div><h3>Material and methods</h3><div>Three PAEK types, ceramic-filled polyetheretherketone (PEEK), titanium dioxide-filled polyetherketoneketone (PEKK), and PEEK with disk shape (Ø10×2.5-mm) were airborne-particle abraded using 110-µm Al₂O₃ at 0.2 MPa. Specimens were then evenly allocated into 2 main groups: one group received surface bonding primer (SBP) application alone, while the other group underwent HNP treatment followed by primer application (PLP). Surface wettability and shear bond strength (SBS) were assessed before and after artificial aging protocols, which included thermocycling and highly accelerated stress testing. Failure modes were analyzed microscopically to identify adhesive, mixed, or cohesive failures. Statistical analysis was performed using 3-way ANOVA and the Tukey HSD test (α=.05).</div></div><div><h3>Results</h3><div>PLP-treated groups showed significantly improved wettability and increased SBS across all materials compared with SBP (<em>P</em>&lt;.05), with the PLP-treated PEKK achieving the highest SBS at 16.35 MPa. After artificial aging, PLP-treated specimens revealed minimal reduction in SBS, with PEKK maintaining superior performance and the smallest decrease observed compared with others (<em>P</em>&lt;.05). Failure mode analysis indicated a higher incidence of mixed failures for PLP-treated specimens, suggesting enhanced bond durability. Statistical analysis confirmed that differences across material types and treatments were significant (<em>P</em>&lt;.05), highlighting the effectiveness of the HNP and primer application in improving long-term adhesion.</div></div><div><h3>Conclusions</h3><div>HNP treatment followed by MMA-UDMA primer application significantly improved the bonding performance and durability of PAEK materials used in dental prostheses. The current findings indicated that this method addressed the persistent challenge of achieving long-term adhesion, particularly in materials with high ketone content.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 1","pages":"Pages 166.e1-166.e8"},"PeriodicalIF":4.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145033605","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":"Fit accuracy of 3D printed Co-Cr multiunit implant-supported fixed dental prostheses: A systematic review of in vitro studies","authors":"Zijing He BS, MDS ,&nbsp;Vincent Bennani DDS, PhD ,&nbsp;John M. Aarts BEdDipDentTech, MHealSc ,&nbsp;Joanne Jung Eun Choi BDentTech (Hon), PGDipCDTech, PhD ,&nbsp;Arthi Veerasamy BDS, MHealSc, PhD, DClinDent","doi":"10.1016/j.prosdent.2025.08.033","DOIUrl":"10.1016/j.prosdent.2025.08.033","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Systematic reviews evaluating the fit accuracy of cobalt chromium (Co-Cr) multiunit implant-supported fixed dental prostheses (ISFDPs) fabricated by 3-dimensional (3D) printing are lacking.</div></div><div><h3>Purpose</h3><div>The purpose of this systematic review was to evaluate the fit accuracy of 3D printed Co-Cr multiunit ISFDPs based on recent in vitro studies.</div></div><div><h3>Material and methods</h3><div>Searches were performed across Medline (via Ovid), Embase, Web of Science, PubMed, and Scopus for articles published up to June 2025. The final selection of articles was made according to the inclusion and exclusion criteria. The Quality Assessment Tool For In Vitro Studies (QUIN Tool) was employed to evaluate the methodological quality of the included studies. A descriptive analysis was conducted to summarize the findings from the included studies.</div></div><div><h3>Results</h3><div>After screening and applying the eligibility criteria, a total of 7 articles were found eligible out of the initial 617 records. One additional article was identified through manual search, bringing the total to 8. Quality assessment showed that 2 studies had a low risk of bias, and 6 had a medium risk. Three studies focused on complete arch (12-unit) ISFDPs and 5 studies on 3-unit prostheses. The fit outcome of 3D printed Co-Cr ISFDPs, compared with other fabrication methods, varied across frameworks with different span lengths.</div></div><div><h3>Conclusions</h3><div>Most studies investigated 3-unit ISFDPs supported by 2 implants and reported clinically acceptable marginal fit across fabrication methods. For 12-unit ISFDPs, 3D printed frameworks showed less accurate fit than milled ones but better than cast frameworks. Digital pattern fabrication contributed to improved fit of cast complete arch prostheses.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 1","pages":"Pages 64.e1-64.e10"},"PeriodicalIF":4.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145053685","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":"Longitudinal assessment of trismus in patients with advanced stage oral and oropharyngeal cancer","authors":"Kanchan P. Dholam MDS ,&nbsp;Priyanka Somani MDS, FDPO ,&nbsp;Sandeep Gurav MDS, FDPO, FDS RCPS (Glasgow) ,&nbsp;Jinesh Dugad MDS, FDPO ,&nbsp;Pankaj Kharade MDS, FDPO ,&nbsp;Pallavi P. Rane MSc (Clinical Research) ,&nbsp;Gurkaran Preet Singh MDS, FDPO, MFDS RCS (Edinburgh)","doi":"10.1016/j.prosdent.2025.03.005","DOIUrl":"10.1016/j.prosdent.2025.03.005","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Trismus is a common treatment-related effect experienced by patients undergoing treatment for head and neck cancer. However, literature on the time-course relationship between the clinical parameters and magnitude of trismus in this cohort is sparse.</div></div><div><h3>Purpose</h3><div>The purpose of this clinical study was to evaluate longitudinal change in maximum incisal opening (MIO) and its interaction with tumor site and treatment modality in patients undergoing treatment for advanced stage oral and oropharyngeal cancer The secondary aim was to study change in dental caries experience and health-related quality of life (HRQoL).</div></div><div><h3>Material and methods</h3><div>Seventy consecutive, adult, treatment-naïve patients with biopsy-proven squamous cell carcinoma (SCC) of the oral cavity and/or oropharynx were recruited in a longitudinal, convenience-cohort study from July 2022 to January 2023 at a tertiary care cancer center (Tata Memorial Hospital) in India. The patients received treatment as per the plan determined by a multidisciplinary tumor board. Study assessments were done at 3 time points: before treatment (T₀), immediately after treatment (T₁), and 6 months after treatment (T₂). A linear mixed-effects model with aligned rank transformation (ART) was used to analyze the effects of time, site, and treatment, along with their interactions, on the primary outcome variable MIO. The Wilcoxon signed-rank test was used to compare corresponding HRQoL domains (α=.05).</div></div><div><h3>Results</h3><div>Irrespective of tumor site and treatment modality, a significant longitudinal change was found in MIO and caries score (<em>P</em>&lt;.001). Patients with oral tumors demonstrated worse outcomes than those with oropharyngeal lesions (<em>P</em>=.008). A high prevalence of immediate post-treatment trismus was noted in patients undergoing multimodality treatment (83%).</div></div><div><h3>Conclusions</h3><div>Patients undergoing treatment for advanced-stage oral and oropharyngeal cancer experience a varying burden of trismus and dental caries. Timely oral care by a dental oncologist, as an integral member of a multidisciplinary team, is essential to alleviate problems and restore quality of life.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 1","pages":"Pages 187-194"},"PeriodicalIF":4.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143989037","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":"Digital imaging for an effective tooth color match for zirconia restorations: The eLAB protocol","authors":"Thais Marques Simek Vega Gonçalves DMD, MS, PhD ,&nbsp;Zuila Maria Lobato Wanghon DMD, MS ,&nbsp;Artur Yamamoto DMD ,&nbsp;Henrique César Schimitz Gassen ,&nbsp;Isabela Kendra Rodrigues Oliveira ,&nbsp;Analucia Gebler Phillippi DMD, MS, PhD","doi":"10.1016/j.prosdent.2025.02.050","DOIUrl":"10.1016/j.prosdent.2025.02.050","url":null,"abstract":"<div><div>Tooth color matching for ceramic restorations can be challenging, especially for teeth with vertical fracture lines or different color nuances. The dental laboratory technician's expertise in layering ceramic is essential for achieving a good esthetic result. However, accurately reproducing the correct color in the definitive dental restoration requires effective communication with the dental laboratory technician and an understanding of color science. This report illustrates the use of the eLAB protocol, a photocolorimetric technique for recording and conveying the color of adjacent teeth. It also demonstrates how this method can improve communication with dental laboratory technicians, ultimately improving predictable esthetic outcomes.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 1","pages":"Pages 9-14"},"PeriodicalIF":4.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143710396","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":"An esthetic solution for restoring a labially inclined implant by using an additively manufactured plug-assisted retained zirconia veneer: A dental technique","authors":"Chenyang Xie PhD ,&nbsp;Manlin Sun PhD ,&nbsp;Zhicheng Yin MDS ,&nbsp;Li Han MDS ,&nbsp;Haiyang Yu DDS, PhD","doi":"10.1016/j.prosdent.2025.02.036","DOIUrl":"10.1016/j.prosdent.2025.02.036","url":null,"abstract":"<div><div>The facial opening of the screw access channel can lead to esthetic compromises in screw-retained restorations, while the use of cement-retained complete crowns may result in residual cement in the proximal areas, and traditional veneers without proximal coverage often lack adequate retention. To address these issues, a plug-assisted retained veneer was developed. First, the 3-dimensional position of an implant was obtained, and a custom abutment was designed to mimic the contour of a veneer preparation. Subsequently, the abutment was fabricated and positioned on the printed cast. After the acquisition of the scan data, a veneer with a plug was designed and produced. A reference scan was then obtained. Finally, the veneer with the plug was delivered, where a digital protocol was used to verify a good fit. This plug functions as a macro retention form while simultaneously seals the screw access opening, enhancing retention and the esthetic outcomes without compromising the fit.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 1","pages":"Pages 15-20"},"PeriodicalIF":4.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143670219","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":"Biomechanical impact of sagittal curvature radius in glenoid fossa on TMJ prosthesis performance: A finite element study of custom designs","authors":"Manuel Mejía Rodríguez MSc ,&nbsp;Jhon Jairo Osorio Orozco DDS ,&nbsp;Kevin Díaz-Rojas DDS ,&nbsp;Hernán D. Sánchez-Restrepo BSME ,&nbsp;Octavio Andrés González-Estrada PhD","doi":"10.1016/j.prosdent.2025.08.039","DOIUrl":"10.1016/j.prosdent.2025.08.039","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Although custom temporomandibular joint (TMJ) prostheses manufactured via computer-aided design and manufacturing (CAD-CAM) and produced through 3-dimensional (3D) printing or computer numerical control (CNC) allow for sagittal curvature adjustments in the glenoid fossa, their design remains unregulated by the Food and Drug Administration. Consequently, the geometry is determined largely by the engineer’s discretion, with limited biomechanical evidence to guide these decisions. The lack of validation regarding how sagittal curvature influences joint stress distribution under various anatomical and functional conditions represents a gap in current knowledge that warrants investigation.</div></div><div><h3>Purpose</h3><div>The purpose of this finite element method (FEM) study was to evaluate how variations in the sagittal radius of curvature of the glenoid fossa affect stress distribution in custom TMJ prostheses for 2 patients.</div></div><div><h3>Material and methods</h3><div>A 3D reconstruction of the temporomandibular joint of 2 patients was carried out. Temporomandibular prostheses were designed with different sagittal radii of curvature at the level of the rotary hinge depending on the occlusal plane, the customized orientation of the muscles, the angle of the occlusal plane and Frankfort plane, and the direction of the load at the level of the second left molar, using FEM. Subsequently, mechanical stresses and kinematic translation were evaluated based on boundary conditions, joint constraints, bone mechanical properties, and soft tissue properties.</div></div><div><h3>Results</h3><div>The semicircular base curvature radius #1 restricted the sagittal displacements of the prosthetic condylar head and increased the stress state on the articular surface. In contrast, the curvature radii #3 and #4 reduced the von Mises stresses and minimum principal stresses by 50% and optimized the translation of the prosthetic condylar component by 45%, respectively.</div></div><div><h3>Conclusions</h3><div>The findings suggest that incorporating elliptical sagittal curvature radii in the design of TMJ prostheses may offer biomechanical advantages over traditional spherical models. These geometries appear to facilitate more natural joint kinematics and reduce stress, supporting their use in personalized prosthetic development to enhance joint function, longevity, and patient outcomes.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 1","pages":"Pages 137.e1-137.e11"},"PeriodicalIF":4.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145033536","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":"Clinical accuracy of complete arch implant scans recorded by using a noncalibrated splinting technique, intraoral photogrammetry, and extraoral photogrammetry with snap-on markers","authors":"Marta Revilla-León DDS, MSD, PhD ,&nbsp;Rocio Cascos DDS ,&nbsp;Abdul B. Barmak MD, MSc, EdD ,&nbsp;Michael Drone DDS ,&nbsp;John C. Kois DMD, MSD ,&nbsp;Miguel Gómez-Polo DDS, PhD","doi":"10.1016/j.prosdent.2025.09.012","DOIUrl":"10.1016/j.prosdent.2025.09.012","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The selection of an implant scanning technique for recording implant positions is a critical element that impacts the implant-prosthodontic discrepancy. However, clinical studies that have analyzed the accuracy of the different implant scanning techniques are lacking. Additionally, the impact of the retention system of the markers on the accuracy of extraoral photogrammetry (PG) devices is unknown.</div></div><div><h3>Purpose</h3><div>The purpose of this clinical study was to compare the accuracy of complete arch implant scans captured by using intraoral and extraoral PG devices and a noncalibrated splinting method.</div></div><div><h3>Material and methods</h3><div>A patient with a mandibular edentulous arch with 4 osseointegrated implants with implant abutments (Multi-Abutment) participated in the study. To obtain the reference file (control), a screw-retained optical marker was hand tightened on each implant abutment, and 10 succeeding PG scans were recorded by using a calibrated extraoral PG system (Micron Mapper). Three groups were developed based on the technique used to capture the implant scans: MicronMapper, Elite, and IOConnect (n=10). In the MicronMapper group, a snap-on optical marker of the extraoral PG device was positioned on each implant abutment, and PG scans were recorded with the camera of the PG system. In the Elite group, scan bodies were hand tightened on the implant abutments, and intraoral scans were captured by using the corresponding intraoral scanner (IOS) (Aoralscan Elite). In the IOConnect group, scan bodies were hand tightened on the implant abutments connected in the center of the arch, and intraoral scans were captured by using an IOS (TRIOS 5). Euclidean linear and angular measurements were calculated on the 10 reference scans, and the average was used to compare the discrepancies with the same measurements obtained on each experimental scan. One-way ANOVA and Tukey tests were used to analyze the trueness data. The Levene test was used to analyze the precision values (α=.05).</div></div><div><h3>Results</h3><div>Linear precision discrepancies were found among the groups tested (<em>P</em>=.008). The IOConnect group had significantly better linear precision than the MicronMapper and Elite groups (<em>P</em>=.017). Additionally, significant angular trueness differences were found among the groups tested (<em>P</em>&lt;.001). The MicronMapper and Elite groups (<em>P</em>&lt;.001) and Elite and IOConnect (<em>P</em>&lt;.001) were significantly different from each other. The Elite group had the best angular trueness. Moreover, the Levene test demonstrated significant angular precision discrepancies among the groups tested (<em>P</em>=.026). The MicronMapper and Elite groups had the best angular precision.</div></div><div><h3>Conclusions</h3><div>The implant scanning technique tested impacted the trueness and precision of complete arch implant scans.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 1","pages":"Pages 108.e1-108.e7"},"PeriodicalIF":4.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145176105","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":"Comparative analysis of surface characteristics and color stability in zirconia-reinforced resin composites: 3D printing, subtractive, and layering techniques","authors":"Luiza Freitas Brum Souza DDS, MSD, PhD ,&nbsp;Kétlin Fagundes Teixeira DDS ,&nbsp;Ana Carolina Cadore-Rodrigues DDS, MSD, PhD ,&nbsp;Felipe Somavilla Binotto DDS ,&nbsp;Luiz Felipe Valandro DDS, MSD, PhD ,&nbsp;Rafael R. Moraes DDS, MSD, PhD ,&nbsp;Mutlu Özcan DDS, MSD, PhD ,&nbsp;Gabriel Kalil Rocha Pereira DDS, MSD, PhD","doi":"10.1016/j.prosdent.2025.09.013","DOIUrl":"10.1016/j.prosdent.2025.09.013","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Despite growing interest in zirconia-reinforced resin composites, the influence of manufacturing techniques on their surface and optical stability remains unclear.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate the surface characteristics and color stability of zirconia-reinforced resin composite materials produced via 3 techniques: 3-dimensional (3D) printing, subtractive manufacturing, and layering.</div></div><div><h3>Material and methods</h3><div>Thirty-six disks (Ø10×1.0 mm) were prepared and divided into 3 groups: 3D printing (PriZma 3D Bio Crown; MakertechLabs), subtractive manufacturing (Lava Ultimate; 3M), and layering (Filtek Z350 XT; 3M). Surface properties were assessed using roughness analysis and scanning electron microscopy (SEM). Color coordinates (L*, a*, b*) were recorded using a spectrophotometer (SP60; X-Rite) at baseline, after staining (coffee or red wine for 12 days), and after repolishing (Superfix Dental Finishing &amp; Polishing Disc System; TDV). Statistical analysis included color differences (∆E₀₀) and translucency parameter differences (∆TP₀₀), considering acceptability (AT) and perceptibility thresholds (PT) (α=.05).</div></div><div><h3>Results</h3><div>Three-dimensional printing exhibited higher Ra than subtractive (<em>P</em>&lt;.001) or layering (<em>P</em>=.010). For Rz, 3D printing and Layering were similar and better than Subtractive (<em>P</em>&lt;.001). SEM revealed porous surfaces in 3D printing, contrasting with denser surfaces in Subtractive and Layering. All groups showed color changes exceeding AT, with 3D printing significantly higher after coffee or red wine exposure (<em>P</em>&lt;.05). Repolishing reduced the ∆E₀₀ of Subtractive below PT after coffee staining and below AT after wine staining. ∆TP₀₀ altered after coffee staining, with Subtractive below AT after wine staining. Repolishing reversed ∆TP₀₀ below AT for all conditions.</div></div><div><h3>Conclusions</h3><div>Three-dimensional printing and layering resulted in higher surface roughness, greater color changes, and lower translucency than the subtractive technique.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"135 1","pages":"Pages 165.e1-165.e9"},"PeriodicalIF":4.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145149574","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}