Journal of Prosthetic Dentistry最新文献

{"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}

{"title":"Effect of ultrasonic chemical cleaning solutions on different dental interim restoration material properties. Part II: Chemical properties of chemical stability, solubility, and liquid sorption","authors":"Kawther Ali BDM, B.Med.Sc, MS,&nbsp;Ahmad Alenezi BSc, MSc, PhD,&nbsp;Abdulaziz A. Alzaid BDS, MS,&nbsp;Charles Goodacre DDS, MSD","doi":"10.1016/j.prosdent.2026.07.003","DOIUrl":"10.1016/j.prosdent.2026.07.003","url":null,"abstract":"&lt;div&gt;&lt;h3&gt;Statement of problem&lt;/h3&gt;&lt;div&gt;Cleaning dental interim crowns using chemical agents may affect chemical stability, solubility, and liquid sorption. Studies investigating the reaction of different interim materials with different cleaning solutions are lacking.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;Cleaning dental interim crowns using chemical agents may affect chemical stability, solubility, and liquid sorption. Studies investigating the reaction of different interim materials with different cleaning solutions are lacking.&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 the effect of chemical cleaning solutions on the chemical stability, liquid sorption, and solubility of conventional and computer-aided design and computer-aided manufacturing (CAD-CAM) fabricated dental interim materials.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;The purpose of this in vitro study was to evaluate the effect of chemical cleaning solutions on the chemical stability, liquid sorption, and solubility of conventional and computer-aided design and computer-aided manufacturing (CAD-CAM) fabricated dental interim materials.&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Material and methods&lt;/h3&gt;&lt;div&gt;A total of 192 specimens were fabricated using the following materials and fabrication methods: conventional chemically activated polymethyl methacrylate (PMMA) &lt;em&gt;n&lt;/em&gt;=48, bis-acrylic composite &lt;em&gt;n&lt;/em&gt;=48, milled PMMA &lt;em&gt;n&lt;/em&gt;=48, and 3-dimensional (3D) printed resin &lt;em&gt;n&lt;/em&gt;=48. Each group was treated with 4 solutions (water &lt;em&gt;n&lt;/em&gt;=12, general purpose cleaner &lt;em&gt;n&lt;/em&gt;=12, tartar and stain cleaner &lt;em&gt;n&lt;/em&gt;=12, cement remover cleaner &lt;em&gt;n&lt;/em&gt;=12). Each specimen was immersed in the assigned solution for 5 cycles of 10 minutes using an ultrasonic water bath. Chemical stability was assessed with Fourier transform infrared spectroscopy indices: residual monomer (RMI), hydrogen (HI), carbonyl (CaI), and carbon oxygen (COI). Sorption and solubility were measured at baseline, after 2 cleaning cycles, and after 5 cleaning cycles. Data were analyzed using generalized estimating equations (GEEs) to account for repeated measures and analyze the difference in chemical stability, sorption, and solubility between groups (α=.05).&lt;/div&gt;&lt;/div&gt;&lt;div&gt;A total of 192 specimens were fabricated using the following materials and fabrication methods: conventional chemically activated polymethyl methacrylate (PMMA) &lt;em&gt;n&lt;/em&gt;=48, bis-acrylic composite &lt;em&gt;n&lt;/em&gt;=48, milled PMMA &lt;em&gt;n&lt;/em&gt;=48, and 3-dimensional (3D) printed resin &lt;em&gt;n&lt;/em&gt;=48. Each group was treated with 4 solutions (water &lt;em&gt;n&lt;/em&gt;=12, general purpose cleaner &lt;em&gt;n&lt;/em&gt;=12, tartar and stain cleaner &lt;em&gt;n&lt;/em&gt;=12, cement remover cleaner &lt;em&gt;n&lt;/em&gt;=12). Each specimen was immersed in the assigned solution for 5 cycles of 10 minutes using an ultrasonic water bath. Chemical stability was assessed with Fourier transform infrared spectroscopy indices: residual monomer (RMI), hydrogen (HI), carbonyl (CaI), and carbon oxygen (COI). Sorption and solubility were m","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"136 4","pages":"Pages e91-e100"},"PeriodicalIF":5.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148604354","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 build orientation on marginal and internal discrepancies of zirconia crowns fabricated by using digital light processing 3D printing: A clinical study","authors":"Ji-Min Cha DDS,&nbsp;KeunBaDa Son PhD,&nbsp;Yoon-Jeong Shin DDS,&nbsp;Gyu Ri Kim MS,&nbsp;So-Yeun Kim DDS, PhD,&nbsp;Kyu-Bok Lee DDS, PhD","doi":"10.1016/j.prosdent.2026.06.028","DOIUrl":"10.1016/j.prosdent.2026.06.028","url":null,"abstract":"&lt;div&gt;&lt;h3&gt;Statement of problem&lt;/h3&gt;&lt;div&gt;Digital light processing (DLP) 3-dimensional (3D) printing enables the additive fabrication of monolithic zirconia crowns; however, the effect of build orientation on their marginal and internal discrepancies in vivo, relative to conventionally milled zirconia crowns, remains insufficiently characterized.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;Digital light processing (DLP) 3-dimensional (3D) printing enables the additive fabrication of monolithic zirconia crowns; however, the effect of build orientation on their marginal and internal discrepancies in vivo, relative to conventionally milled zirconia crowns, remains insufficiently characterized.&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Purpose&lt;/h3&gt;&lt;div&gt;The purpose of this clinical study was to compare the marginal and internal discrepancies of zirconia crowns fabricated by conventional milling and by DLP 3D printing and to evaluate the influence of build orientation (0, 45, and 90 degrees) on the fit of DLP- printed crowns.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;The purpose of this clinical study was to compare the marginal and internal discrepancies of zirconia crowns fabricated by conventional milling and by DLP 3D printing and to evaluate the influence of build orientation (0, 45, and 90 degrees) on the fit of DLP- printed crowns.&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Material and methods&lt;/h3&gt;&lt;div&gt;Ten participants requiring a single posterior zirconia crown in the maxilla or mandible were enrolled. For each participant, 4 crowns with identical designs were fabricated: 1 milled crown (Ceramill Motion 2; Amann Girrbach AG) and 3 DLP-printed crowns (TD 6; 3D Controls Co Ltd) at build orientations of 0, 45, and 90 degrees. 4Y PSZ zirconia blocks (Ceramill Zolid FX; Amann Girrbach AG) and a 3Y TZP zirconia slurry (3DCera; 3D Controls Co Ltd) were used. The silicone replica technique (Fit Checker; GC Corp) was used to measure the absolute marginal discrepancy (AMD), marginal gap (MG), and internal discrepancies at the chamfer, axial, line angle, and occlusal regions. Replica thicknesses were quantified under a digital microscope. Data were analyzed with a 1-way repeated measures analysis of variance, with fabrication condition treated as a within-subject factor. Post hoc pairwise comparisons were adjusted with the Holm procedure, and partial η&lt;sup&gt;2&lt;/sup&gt; values were calculated to quantify effect size (α=.05).&lt;/div&gt;&lt;/div&gt;&lt;div&gt;Ten participants requiring a single posterior zirconia crown in the maxilla or mandible were enrolled. For each participant, 4 crowns with identical designs were fabricated: 1 milled crown (Ceramill Motion 2; Amann Girrbach AG) and 3 DLP-printed crowns (TD 6; 3D Controls Co Ltd) at build orientations of 0, 45, and 90 degrees. 4Y PSZ zirconia blocks (Ceramill Zolid FX; Amann Girrbach AG) and a 3Y TZP zirconia slurry (3DCera; 3D Controls Co Ltd) were used. The silicone replica technique (Fit Checker; GC Corp) was used to measure the absolute marginal discrepancy (AMD), marginal gap (MG), and internal discrepancies at the chamfer, axial, ","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"136 4","pages":"Pages 1097-1104"},"PeriodicalIF":5.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148447537","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 immediate complete arch digital implant scans using oriented horizontal scan bodies: A clinical study","authors":"Xiaosong Yi DDS,&nbsp;Xi Jiang DDS,&nbsp;Jia Luo DDS,&nbsp;Shuxin Ren DDS","doi":"10.1016/j.prosdent.2026.06.035","DOIUrl":"10.1016/j.prosdent.2026.06.035","url":null,"abstract":"&lt;div&gt;&lt;h3&gt;Statement of problem&lt;/h3&gt;&lt;div&gt;Complete arch implant scanning with an intraoral scanner (IOS) immediately after implant placement is challenging because of blood, saliva, and mobile soft tissues. It remains unclear whether oriented horizontal implant scan bodies (ISBs) can maintain accuracy under these conditions compared to stable laboratory scans.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;Complete arch implant scanning with an intraoral scanner (IOS) immediately after implant placement is challenging because of blood, saliva, and mobile soft tissues. It remains unclear whether oriented horizontal implant scan bodies (ISBs) can maintain accuracy under these conditions compared to stable laboratory scans.&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Purpose&lt;/h3&gt;&lt;div&gt;The purpose of this clinical study was to assess the accuracy of immediate intraoral scans using oriented horizontal ISBs after complete arch implant placement and compared them with scans of corresponding stone casts under laboratory conditions.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;The purpose of this clinical study was to assess the accuracy of immediate intraoral scans using oriented horizontal ISBs after complete arch implant placement and compared them with scans of corresponding stone casts under laboratory conditions.&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Material and methods&lt;/h3&gt;&lt;div&gt;Participants receiving complete arch implant placement were included. Immediately after surgery, 2 recordings were obtained: an intraoral digital scan (immediate IOS) using oriented horizontal ISBs (ioConnect), and a conventional open-tray splinted impression. Stone casts from the conventional impressions served as the reference. The same ISBs were attached to the reference cast and scanned to generate the laboratory IOS dataset. Immediate and laboratory IOS datasets were superimposed on the reference cast using a standardized protocol. Four accuracy metrics were analyzed: root-mean-square (RMS) surface deviation, linear Euclidean deviation, angular deviation, and interimplant distance deviation. A 2-way mixed-effects ANOVA was used, with scanning workflow (immediate versus laboratory) as a within-subject factor and jaw type (maxilla versus mandible) as a between-subject factor (α=.05). All measurements were performed by a single calibrated examiner.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;Participants receiving complete arch implant placement were included. Immediately after surgery, 2 recordings were obtained: an intraoral digital scan (immediate IOS) using oriented horizontal ISBs (ioConnect), and a conventional open-tray splinted impression. Stone casts from the conventional impressions served as the reference. The same ISBs were attached to the reference cast and scanned to generate the laboratory IOS dataset. Immediate and laboratory IOS datasets were superimposed on the reference cast using a standardized protocol. Four accuracy metrics were analyzed: root-mean-square (RMS) surface deviation, linear Euclidean deviation, angular deviation, and interimplant distance deviation. A 2-way mixed-effects ANOVA was","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"136 4","pages":"Pages 1105-1112"},"PeriodicalIF":5.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148456153","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}