Journal of Prosthetic Dentistry最新文献

{"title":"Fatigue behavior of multilayered zirconias: Impact of finishing and polishing protocols.","authors":"Sarah Emille Gomes da Silva, Rita Adriana Souza da Silva de Assis, Camila da Silva Rodrigues, Beatriz Serralheiro da Cruz, Renata Marques de Melo, Marco Antonio Bottino, Paulo Francisco César, Yu Zhang, Rodrigo Othávio Assunção E Souza","doi":"10.1016/j.prosdent.2026.09.012","DOIUrl":"https://doi.org/10.1016/j.prosdent.2026.09.012","url":null,"abstract":"<p><strong>Statement of problem: </strong>Evidence regarding the effect and standardization of finishing and polishing protocols on the fatigue resistance and surface characteristics of multilayered zirconia remains limited.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to evaluate the effect of different finishing and polishing protocols on fatigue failure load (FFL), the number of cycles to failure (CFF), and the survival rates of new dental zirconias.</p><p><strong>Material and methods: </strong>Sixty ceramic disks (Ø12×1.5 mm) following the International Organization for Standardization (ISO) 6872 standard were fabricated with 3 zirconia systems: ultratranslucent zirconia (UT), multilayered 3Y-TZP/5Y-PSZ zirconia (GT), and multilayered 4Y-PSZ/5Y-PSZ zirconia (SG) (N=180). After sintering, the specimens from each zirconia were divided into 6 groups (n=15) according to the protocols: DR (diamond rotary instruments + rubber points), R (rubber points), GL (diamond rotary instruments + rubber points + glaze), and C (control). Fatigue resistance was tested using the stepwise stress method (5 Hz, 100 000 cycles). X-ray diffraction (XRD), fractography, and surface roughness analyses were also performed. Two-way ANOVA, the Tukey pairwise comparison test (α=.05), Kaplan-Meier, and Mantel-Cox tests were used for statistical analyses (α=.05).</p><p><strong>Results: </strong>The finishing and polishing protocol (P=.001), zirconia type (P<.001), and their interaction (P=.028) affected fatigue resistance. For GT, zirconia rubber polishing (GT_R- 831.94^A MPa) presented higher fatigue resistance than the control group (GT_C- 646.53^B MPa), while for UT, zirconia diamond rotary instruments + rubber points reduced the resistance (UT_DR- 273.44^D MPa) compared with the control group (UT_C- 383.02^C MPa). SG zirconia showed no significant differences across finishing and polishing protocols. For CFF, the finishing and polishing protocol significantly influenced (P<.001) the UT ceramic. Glaze (0.42^D µm) reduced the roughness of SG ceramic compared with the control group (0.93^AB µm). The highest roughness value was observed in the UT control group (UT_C- 0.99^A µm).</p><p><strong>Conclusions: </strong>Finishing and polishing affected the mechanical strength and surface characteristics of zirconia, depending on zirconia composition and microstructure. For ultratranslucent zirconia, finishing procedures reduced fatigue strength, whereas for multilayered zirconia, finishing protocols resulted in increased fatigue strength.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149148675","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":"Surface alterations in materials for occlusal devices subjected to simulated brushing with different solutions.","authors":"Edivar Ximenes de Aragao Junior, Diego Torres Silva, Stefany Joaquina Sousa Farias, Bruna de Souza Guedes, Evelyn Mikaela Kogawa, Rodrigo Antonio de Medeiros","doi":"10.1016/j.prosdent.2026.09.014","DOIUrl":"https://doi.org/10.1016/j.prosdent.2026.09.014","url":null,"abstract":"<p><strong>Statement of problem: </strong>Daily brushing of occlusal devices with different cleaning solutions can compromise the surface roughness and microhardness of the materials, affecting their clinical performance and longevity.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to evaluate the influence of simulated brushing with different solutions on the surface roughness and microhardness of materials used to fabricate occlusal devices.</p><p><strong>Material and methods: </strong>A total of 180 cylindrical specimens (Ø6×3 mm) were fabricated and divided into 3 groups: milled polymethyl methacrylate (PMMA) blocks (M), three-dimensional (3D) printed resin (P), and microwave-polymerized acrylic resin (MW). The specimens were subjected to simulated brushing with 4 solutions (distilled water, neutral detergent, toothpaste, and brushing gel for cleaning acrylic resin pieces). Vickers microhardness and surface roughness were evaluated before and after brushing. Data were analyzed using a 3-way repeated-measures ANOVA, followed by the Tukey honestly significant difference (HSD) test (α=.05).</p><p><strong>Results: </strong>Group M exhibited the highest microhardness values under all conditions. Microhardness remained stable after brushing in all groups, except for group P with toothpaste, which showed a significant reduction (P<.001). Toothpaste significantly reduced the roughness of all materials (P<.001). Group P also showed decreased roughness after brushing with the gel (P<.001), whereas Group MW showed a significant reduction in roughness after exposure to neutral detergent (P<.001).</p><p><strong>Conclusions: </strong>Simulated brushing promoted changes in the surface roughness of tested materials. Toothpaste produced a statistically significant reduction in roughness for all materials, while neutral detergent promoted a reduction only in MW. Group P showed a significant reduction in microhardness and greater surface wear compared with toothpaste. Among the solutions tested, neutral detergent was the least aggressive method and did not significantly alter the properties of the tested resins.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149149131","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 connector dimensions and span length on fracture resistance of high-translucency 4Y-TZP: An in vitro and finite element study.","authors":"Anna Thereza Peroba Rezende Ramos, Austin Heath, Daler Elisa Tarrazzi, Mateus Garcia Rocha, Rafael Rocha Pacheco","doi":"10.1016/j.prosdent.2026.09.010","DOIUrl":"https://doi.org/10.1016/j.prosdent.2026.09.010","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Statement of problem: &lt;/strong&gt;High-translucency 4-mol% yttria-stabilized tetragonal zirconia polycrystal (4Y-TZP) has been increasingly used for implant-supported prostheses because of its superior esthetics, yet connector size recommendations have been derived from studies of stronger conventional 3-mol% Y-TZP. Whether these guidelines remain valid for materials with 30 to 40% lower flexural strength is unknown.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Purpose: &lt;/strong&gt;The purpose of this in vitro and finite element study was to evaluate the effect of connector cross-sectional dimensions and span length on the fracture resistance of high-translucency monolithic 4Y-TZP and to characterize stress distribution and concentration at the connector.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Material and methods: &lt;/strong&gt;Bar-shaped specimens incorporating 4 connector regions were milled from presintered high-translucency 4Y-TZP (KATANA Zirconia HTML PLUS A2). Four connector configurations were tested: 3×3 mm, 4×3 mm, 4×4 mm (elliptical cross-sections), and 5×4 mm (full cross-section control), with cross-sectional areas of 7.1, 9.4, 12.6, and 20.0 mm². The specimens were tested at 2 span lengths (22 and 42 mm) by 3-point bend testing (n=6 per group). Fracture load (N) was recorded, and flexural stress at the connector (MPa) was calculated from the local bending moment and the section modulus appropriate to each cross-sectional geometry. Three-dimensional finite element models determined maximum principal stress (σ₁) and stress concentration factors. Data were analyzed with 2-way analysis of variance (ANOVA), the Tukey honestly significant difference (HSD) test, and the Pearson correlation (α=.05).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Results: &lt;/strong&gt;Connector configuration (P&lt;.001), span length (P&lt;.001), and their interaction (P&lt;.001) significantly affected fracture load. Mean ±standard deviation fracture load ranged from 208 ±14 N (3×3 mm, 42-mm span) to 1806 ±142 N (5×4 mm, 22-mm span) and correlated strongly with connector area (r≥.979, P&lt;.001). Load gain per mm² of connector area was approximately twice as large for the 22-mm span (98.3 N per mm²) as for the 42-mm span (52.3 N per mm²). When load was converted to flexural stress at the connector, only connector configuration remained significant (P&lt;.001); span length (P=.816) and the interaction (P=.162) were not significant. Connector stress converged into a narrow range (533 to 745 MPa) within published 4Y-TZP flexural strength values. Finite element analysis confirmed stress concentration at the connector base, with σ₁ spanning a factor of only 1.5 (613 to 939 MPa) despite an 8.7-fold range in fracture loads. Under equal applied load, stress concentration factors ranged from 1.67 to 3.92 at the 22-mm span and from 2.62 to 6.42 at the 42-mm span.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Conclusions: &lt;/strong&gt;Reducing connector area disproportionately decreased fracture load, with greater reduction at longer spans. Connector stress values fell within a narrower range than fracture loads","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149148481","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":"Dimensional stability of additively manufactured diagnostic maxillary casts: Influence of cast-base design, PLA filament type, infill density, and storage duration.","authors":"Manuel Schneuwly, Gülce Çakmak, Selin Çelik Öge, Hanan Al-Johani, Burak Yılmaz","doi":"10.1016/j.prosdent.2026.09.013","DOIUrl":"https://doi.org/10.1016/j.prosdent.2026.09.013","url":null,"abstract":"<p><strong>Statement of problem: </strong>The choice of materials and printing strategies in dental cast fabrication may influence accuracy. Evidence regarding the impact of different cast base designs, various polylactic acid (PLA) filaments, and printing processes on the dimensional stability of additively manufactured (AM) diagnostic maxillary casts is lacking.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to evaluate the effects of cast-base design, PLA filament type, and infill density on the dimensional stability of AM diagnostic maxillary casts over a 4-week storage duration.</p><p><strong>Material and methods: </strong>A reference maxillary cast was printed with 4 PLA filaments-eSun PLA+ (ES), BambuLab PLA (BL), Weiton 3D dental-grade PLA (W3D), and Filadental gypsum-reinforced PLA (FD)-fabricated with either a hollow or solid base design and 3 infill densities (5%, 20%, 35%) using a fused filament modeling (FFM) printer. Casts were scanned at 1 day and 1, 2, 3, and 4 weeks after fabrication. Scans were superimposed onto the reference cast to calculate regional and overall cast deviations. Data were analyzed with a generalized linear model and Bonferroni-corrected post hoc tests (α=.05).</p><p><strong>Results: </strong>Cast-base design, filament type, infill density, and storage duration had significant effects on dimensional stability across all regions (P<.001). BL exhibited the lowest deviations at all time points, while FD showed the highest, particularly in hollow-base and 5% infill density within the soft tissue region (P<.001). Cast-base design influenced accuracy in a region-dependent manner, with hollow bases performing better in posterior and entire arch areas, whereas solid bases showed lower deviations in soft tissue regions. The 5% infill density resulted in the highest deviations across all anatomic regions (P<.001).</p><p><strong>Conclusions: </strong>The dimensional stability of FFM-printed casts was influenced by the material formulation, structural design, and internal support architecture. With adequate filament selection and printing settings, tested casts exhibit stable geometry for a minimum of 4 weeks.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149147711","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":"Letter to the Editor regarding, \"Long-term outcomes on direct fiber reinforced composite fixed partial dentures: A 14-year practice-based study\".","authors":"Amir Beizaei, Erfan Biazar, Masoud Sahebi","doi":"10.1016/j.prosdent.2026.07.004","DOIUrl":"https://doi.org/10.1016/j.prosdent.2026.07.004","url":null,"abstract":"","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149148266","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 patient head position and facial scanner viewing angle on the accuracy of the true horizontal plane located using an app-based facial scanner.","authors":"Marta Revilla-León, Edgar García-Zea, Juan Carlos Gallardo-Bastidas, Abdul B Barmak, John C Kois","doi":"10.1016/j.prosdent.2026.08.023","DOIUrl":"https://doi.org/10.1016/j.prosdent.2026.08.023","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Statement of problem: &lt;/strong&gt;App-based facial scanners capable of automatically generating reference planes, including the true horizontal plane (THP), have been developed to integrate virtual patient representations and transfer them to the virtual articulator. However, the influence of the patient head position and the facial scanner viewing angle on the accuracy of the THP located using an app-based facial scanner remains unknown.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Purpose: &lt;/strong&gt;The purpose of this in vivo study was to evaluate the influence of the patient's head position and facial scanner viewing angle on the accuracy of the THP located using an app-based facial scanner (FS) integrated into a smartphone.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Material and methods: &lt;/strong&gt;A total of 5 landmarks were placed on the face of a volunteer. Three scans (reference scans) were acquired with an app-based FS (Qlone) integrated into a smartphone (iPhone Pro 17) and an extraoral scan body (Kois Scan Body) capable of registering the THP relative to the natural head position (NHP). Two groups were defined depending on the volunteer's head position: without (NoNHP group) and with (NHP group) the self-balance and mirror technique to obtain NHP. Two subgroups were created based on the facial scanner viewing angle: at the level (Level subgroup) of or above the interpupillary line (Above subgroup) (n=15). Each reference and experimental scan with the THP generated by the FS was exported. The reference scans were mounted into the virtual articulator (Panadent PCH) by using the THP contained in the extraoral scan body (DentalCAD). Linear measurements were obtained from the landmarks to the auxiliary plane parallel to the articulator's reference table. Each experimental scan was registered to the reference scan using the landmarks as common points without altering the orientation of the corresponding THP. The THP was then oriented parallel to the sagittal plane of the upper arm of the articulator. Lastly, the same linear measurements were calculated. The average of the linear measurements obtained from the 3 reference scans was used as the reference to calculate distortions for each experimental scan. Two-way ANOVA and Tukey tests were used to analyze trueness. The Levene test was used to analyze precision (α=.05).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Results: &lt;/strong&gt;Posterior right plane discrepancies were found between the groups (P&lt;.001) and subgroups (P&lt;.001) with a significant group×subgroup interaction (P=.008). Overall anterior plane discrepancies were revealed between the groups (P&lt;.001) and subgroups (P&lt;.001). Overall posterior left plane discrepancies were found between the groups (P&lt;.001) and subgroups (P&lt;.001), with a significant group×subgroup interaction (P&lt;.001). The NHP group obtained significantly better overall posterior right and anterior and posterior left THP trueness than the NoNHP group. The Same subgroup demonstrated significantly better overall posterior right and anterior and posterior ","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2026-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149127901","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":"Mouth opening after fibula free flap reconstruction: Impact of radiation and implications for prosthodontic rehabilitation.","authors":"Diana Joo, Aditi Gupta, Neeraj Panchal, Nupur Patel, Brian Myungwoo Chang","doi":"10.1016/j.prosdent.2026.08.027","DOIUrl":"https://doi.org/10.1016/j.prosdent.2026.08.027","url":null,"abstract":"<p><strong>Statement of problem: </strong>Mandibular mobility is critical for prosthodontic rehabilitation following maxillofacial reconstruction, especially in a procedure like Jaw-in-a-Day (JIAD) that needs accurate pre-operative planning. The fibula free flap (FFF) reconstruction enables the restoration of appearance and function after benign or neoplastic tumor resection, but some complications, such as trismus, present in a delayed manner or worsen after radiotherapy (RT). The specific magnitude of reduction in maximum incisal opening (MIO) following these procedures is poorly quantified, potentially compromising the feasibility of definitive prosthetic delivery, maintenance, and long-term survivability.</p><p><strong>Purpose: </strong>The purpose of this cross-sectional clinical study was to evaluate and quantify the postoperative reduction in MIO in patients undergoing FFF reconstruction with or without RT.</p><p><strong>Material and methods: </strong>This IRB-approved study evaluated 30 participants (n=10 per group, 80% power, α=.05). Three cohorts were compared: a control group (Group C), patients after FFF reconstruction without RT (Group FFF), and those with FFF with RT (Group FFF+RT). MIO was measured in millimeters using a TheraBite range-of-motion scale. Functional mouth opening was assessed using the 3-finger test. One-way ANOVA with Tukey post hoc testing was used for MIO comparisons, and the Kruskal-Wallis test was used for the 3-finger test. Pearson correlation analysis evaluated the association between variables (α=.05).</p><p><strong>Results: </strong>A statistically significant difference was identified among groups (P<.001). No significant difference was found between control and Group FFF (P=.593), whereas Group FFF+RT demonstrated significantly reduced MIO compared with both groups (P=.005). The greatest reduction was observed in Group FFF+RT, which demonstrated an approximate 30% reduction in MIO compared with the control. A strong positive correlation was also observed between MIO and functional mouth opening (r=.73, P<.001).</p><p><strong>Conclusions: </strong>Mandibular mobility was significantly reduced in Group FFF+RT, demonstrating an approximately 30% decrease in MIO compared with controls. Reconstruction alone did not significantly impair mandibular opening. Functional limitations paralleled objective measurements. These findings underscore the impact of RT on mandibular function and highlight the importance of anticipating restricted mouth opening during prosthodontic planning for complex reconstructions, including JIAD protocols.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149111412","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 xenograft with and without 10% collagen for ridge preservation in periodontally compromised molars: A randomized clinical trial.","authors":"Tao Xu, Haoyun Zhang, Yuying Ren, Wenjie Hu, Yiping Wei, Liman Li","doi":"10.1016/j.prosdent.2026.08.026","DOIUrl":"https://doi.org/10.1016/j.prosdent.2026.08.026","url":null,"abstract":"<p><strong>Statement of problem: </strong>Evidence for alveolar ridge preservation (ARP) using deproteinized bovine bone mineral with or without collagen (DBBM-C versus DBBM) in periodontally compromised molars is limited.</p><p><strong>Purpose: </strong>The purpose of this randomized clinical trial was to assess clinical outcomes following ARP using DBBM-C and DBBM in periodontally compromised molars.</p><p><strong>Material and methods: </strong>Forty-six participants were included and divided into DBBM and DBBM-C groups using simple randomization to receive an ARP procedure. Hard tissue changes were assessed by cone beam computed tomography (CBCT) at baseline and 6 months after surgery. Soft tissue contour changes were assessed by intraoral scans immediately and at 2 weeks and 1, 3, and 6 months postoperatively. Treatment costs and implant placement feasibility were recorded after implant therapy. Group comparisons at baseline and outcome used t tests and Mann-Whitney U, chi-square, or Fisher exact tests (by data distribution), with repeated-measures ANOVA for soft tissue contour changes.</p><p><strong>Results: </strong>The DBBM and DBBM-C exhibited comparable augmentation in central bone height and ridge width (P=.201 and P=.166). The mean collapse of buccal soft tissue contour in the DBBM-C group was 0.99 mm (vertical: P=.040), 1.12 mm (horizontal: P=.013) and less than that in the DBBM group. Neither implant placement feasibility (P=.607) nor total treatment costs (P=.158) revealed significant differences between the groups.</p><p><strong>Conclusions: </strong>Within the limitations of this study, DBBM and DBBM-C showed comparable outcomes regarding ridge dimension changes, implant placement feasibility, and overall treatment costs. DBBM-C demonstrated less soft tissue contour resorption.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":5.6,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149111376","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":"Automated classification of dental implant brands and prosthetic platform sizes on panoramic radiographs using deep learning","authors":"Marcell Mesterházi BSc,&nbsp;Júlia Balogh DMD,&nbsp;Anna Takács DMD,&nbsp;Judit Faragó DMD,&nbsp;Mercédesz Orsós DMD, MSD, PhD,&nbsp;Dorottya Tényi BSc,&nbsp;Dániel Rácz MSc, PhD,&nbsp;Anna Ország MSc,&nbsp;Vera Könyves MSc, PhD,&nbsp;András Csertán MSc,&nbsp;András Benczúr MSc, PhD, DSc,&nbsp;Gergely Mikesy MD, MSc,&nbsp;Tamás Joó BSc, MSc, PhD,&nbsp;Péter Pollner BSc, MSc, PhD,&nbsp;Eitan Mijiritsky DMD, MSD, PhD,&nbsp;Igor R. Blum DDS, PhD, MSc, MA,&nbsp;Márton Kivovics DMD, MDS, PhD","doi":"10.1016/j.prosdent.2026.07.008","DOIUrl":"10.1016/j.prosdent.2026.07.008","url":null,"abstract":"&lt;div&gt;&lt;h3&gt;Statement of problem&lt;/h3&gt;&lt;div&gt;Incomplete clinical records can be a significant hurdle in implant dentistry, transforming routine maintenance or a restorative task into a complex search. When the primary documentation—such as the implant passport or surgical report—is missing, the clinician is forced to rely on radiographic identification and trial-and-error, which increases the risk of component mismatch and patient dissatisfaction.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;Incomplete clinical records can be a significant hurdle in implant dentistry, transforming routine maintenance or a restorative task into a complex search. When the primary documentation—such as the implant passport or surgical report—is missing, the clinician is forced to rely on radiographic identification and trial-and-error, which increases the risk of component mismatch and patient dissatisfaction.&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Purpose&lt;/h3&gt;&lt;div&gt;The purpose of this study was to develop and validate an artificial intelligence (AI) algorithm capable of detecting dental implants on panoramic radiographs and classifying them by implant brand and prosthetic platform size.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;The purpose of this study was to develop and validate an artificial intelligence (AI) algorithm capable of detecting dental implants on panoramic radiographs and classifying them by implant brand and prosthetic platform size.&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Material and methods&lt;/h3&gt;&lt;div&gt;A dataset of 387 panoramic radiographs with 1004 dental implant images was randomly divided into training, validation, and test sets using an 80/10/10 stratified split across 25 independent partitions. Convolutional neural network (CNN) architectures were developed and trained using manually annotated images. Ground truth labels for implant brand and prosthetic platform size were obtained from patient records.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;A dataset of 387 panoramic radiographs with 1004 dental implant images was randomly divided into training, validation, and test sets using an 80/10/10 stratified split across 25 independent partitions. Convolutional neural network (CNN) architectures were developed and trained using manually annotated images. Ground truth labels for implant brand and prosthetic platform size were obtained from patient records.&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Results&lt;/h3&gt;&lt;div&gt;Among the evaluated architectures, a Faster region-based CNN (R-CNN) combined with an EfficientNet-B7 backbone demonstrated the highest diagnostic performance. Implant detection achieved a mean Intersection over Union (IoU) of 77.65% ±11.54% and an accuracy of 99.45% ±0.70% with an average of 0.60 ±0.76 false negatives per split (mean ±standard deviation across 25 partitions). Implant brand classification accuracy was 98.93% ±0.91% (Callus Pro), 97.81% ±1.43% (Denti Root Form), 98.85% ±1.19% (NobelReplace Conical Connection partially machined collar [PMC]), and 96.79% ±1.83% for implants of unknown brand, yielding an overall brand-classification accuracy of 95.66% ±2.02%. Platform-size classification acc","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"136 4","pages":"Pages 1157-1169"},"PeriodicalIF":5.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148604398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of manufacturing protocol, polishing, and thermocycling on water contact angle and hardness of zirconia: Comparison of additive and subtractive techniques","authors":"Gabriela Panca Sabatini Dr med dent, MSc, PhD,&nbsp;Mustafa Borga Dönmez DDS, PhD,&nbsp;Gülce Çakmak DDS, Dr med dent, PhD,&nbsp;Çiğdem Kahveci DDS, PhD,&nbsp;Burak Yılmaz DDS, PhD,&nbsp;Newton Sesma DDS, PhD","doi":"10.1016/j.prosdent.2026.06.029","DOIUrl":"10.1016/j.prosdent.2026.06.029","url":null,"abstract":"&lt;div&gt;&lt;h3&gt;Statement of problem&lt;/h3&gt;&lt;div&gt;The use of additively manufactured zirconia in dental applications is expanding; however, data on how different manufacturing protocols affect its water contact angle and hardness remain limited.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;The use of additively manufactured zirconia in dental applications is expanding; however, data on how different manufacturing protocols affect its water contact angle and hardness remain limited.&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Purpose&lt;/h3&gt;&lt;div&gt;The purpose of this in vitro study was to evaluate how the manufacturing protocol, including variations in additive processing and comparison with subtractively manufactured zirconia with different yttria contents, together with polishing and thermocycling, influences the water contact angle and hardness of zirconia.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;The purpose of this in vitro study was to evaluate how the manufacturing protocol, including variations in additive processing and comparison with subtractively manufactured zirconia with different yttria contents, together with polishing and thermocycling, influences the water contact angle and hardness of zirconia.&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Material and methods&lt;/h3&gt;&lt;div&gt;Ninety-six disk-shaped specimens (Ø10×1.5 mm) were fabricated either additively using a 3-mol% zirconia slurry (INNI Cera; AM) with different firing protocols (combined [1] or separate [2] debinding and sintering cycles) and build orientations (horizontal [AMH], diagonal [AMD], and vertical [AMV]) or subtractively using 3-mol% (IPS e.max ZirCAD LT; SM-LT) or 4-mol% (IPS e.max ZirCAD MT; SM-MT) zirconia (&lt;em&gt;n&lt;/em&gt;=12). Water contact angle and Vickers hardness values were measured before polishing, after polishing, and after thermocycling (10 000 cycles, 5 to 55 °C). Data were analyzed using linear mixed-effects models with Bonferroni-adjusted post hoc tests (α=.05).&lt;/div&gt;&lt;/div&gt;&lt;div&gt;Ninety-six disk-shaped specimens (Ø10×1.5 mm) were fabricated either additively using a 3-mol% zirconia slurry (INNI Cera; AM) with different firing protocols (combined [1] or separate [2] debinding and sintering cycles) and build orientations (horizontal [AMH], diagonal [AMD], and vertical [AMV]) or subtractively using 3-mol% (IPS e.max ZirCAD LT; SM-LT) or 4-mol% (IPS e.max ZirCAD MT; SM-MT) zirconia (&lt;em&gt;n&lt;/em&gt;=12). Water contact angle and Vickers hardness values were measured before polishing, after polishing, and after thermocycling (10 000 cycles, 5 to 55 °C). Data were analyzed using linear mixed-effects models with Bonferroni-adjusted post hoc tests (α=.05).&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Results&lt;/h3&gt;&lt;div&gt;The interaction between manufacturing protocol and processing stage affected the tested outcomes (&lt;em&gt;P&lt;/em&gt;&lt;.001). SM-LT generally exhibited a higher contact angle before polishing (&lt;em&gt;P&lt;/em&gt;≤.003), whereas AMH-1 exhibited higher values than AMV-2 after polishing (&lt;em&gt;P&lt;/em&gt;=.025). Except for AMD-1 and SM-LT (&lt;em&gt;P&lt;/em&gt;&gt;.05), all groups showed their lowest contact angle before polishing (&lt;em&gt;P&lt;/em&gt;≤.028). Before pol","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"136 4","pages":"Pages 1207-1213"},"PeriodicalIF":5.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148579012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}