Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry最新文献

{"title":"Effect of metal framework design on the fracture resistance of implant-supported metal-ceramic crowns fabricated by selective laser melting.","authors":"Sang-Ah Lee, Kyung-Ho Ko, Yoon-Hyuk Huh, Chan-Jin Park, Lee-Ra Cho","doi":"10.1111/jopr.70220","DOIUrl":"https://doi.org/10.1111/jopr.70220","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the fracture resistance of implant-supported metal-ceramic crowns fabricated using selective laser melting (SLM), according to the metal support height around the screw access hole (SAH) and the substructure design.</p><p><strong>Materials and methods: </strong>Metal-ceramic crowns and rectangular bilayer specimens were fabricated using SLM in two independent experimental series. In the SAH design series, the substructure design was kept constant while the metal support height around the SAH was varied (none, half, and complete metal support; n = 12 per group). In the substructure design series, the SAH configuration was held constant (complete metal support), and the metal substructure design was varied (uniform cut-back, lingual support, and circumferential ring support; n = 12 per group). Crown specimens underwent thermomechanical aging (50 N, 100,000 cycles, 2 Hz, 5°C-55°C), followed by fracture resistance testing, Weibull analysis, failure mode classification, and fractographic analysis. Rectangular bilayer specimens representing each framework design were used for edge-chipping evaluation. Statistical analyses used one-way ANOVA and Tukey HSD tests (α = 0.05).</p><p><strong>Results: </strong>The complete metal support SAH design showed significantly greater fracture resistance than the other SAH configurations (p < 0.05). However, in the corresponding rectangular bilayer specimens, this design showed the lowest edge-chipping resistance among the SAH configurations. Fractographic analysis showed that fractures originated at the occlusal loading site and propagated toward the crown margin. Among substructure designs, the circumferential ring design exhibited significantly greater fracture resistance and superior edge-chipping resistance compared with other designs (p < 0.05).</p><p><strong>Conclusions: </strong>Complete metal support around the SAH improved fracture resistance. Loading close to the SAH may increase susceptibility to veneering ceramic chipping under the tested conditions. A circumferential ring design providing uniform ceramic support enhanced overall mechanical performance.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148800447","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":"Multidisciplinary dental treatment planning by artificial intelligence: A comparative evaluation.","authors":"Sohil A Kazim, Bashaer A Alnoman, Razan M Hashim, Charles J Goodacre","doi":"10.1111/jopr.70226","DOIUrl":"https://doi.org/10.1111/jopr.70226","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this study was to evaluate and compare four AI software programs-ChatGPT-5, Microsoft Copilot, Google Gemini (V 2.5), and OpenEvidence-in generating comprehensive dental treatment plans for minimally destructed and severely mutilated teeth using identical clinical inputs.</p><p><strong>Material and methods: </strong>Ten anonymized clinical cases, each consisting of 1 intraoral photograph and 1 corresponding periapical radiograph, were independently submitted to each AI software program using a standardized prompt. A reference standard was established through consensus among four calibrated specialists (one surgically trained prosthodontist, one restorative dentist, one prosthodontist, and one endodontist). AI-generated responses were evaluated using a structured scoring rubric across five domains: diagnostic accuracy, restorability assessment, multidisciplinary integration, treatment sequencing, and extraction appropriateness (score range: 0-10 per case). Agreement among evaluators was assessed using pairwise Cohen's kappa (κ) analysis based on initial independent scoring before consensus discussions.</p><p><strong>Results: </strong>Substantial inter-evaluator agreement was observed (κ = 0.74; 95% CI: 0.68-0.80), indicating consistent application of the scoring rubric. Mean total scores were highest for OpenEvidence (7.7 ± 1.4) and ChatGPT-5 (7.6 ± 1.1), followed by Google Gemini (5.1 ± 1.2) and Microsoft Copilot (4.7 ± 3.1). OpenEvidence and ChatGPT-5 more frequently incorporated phased treatment sequencing, ferrule assessment, restorability analysis, and multidisciplinary treatment considerations. Microsoft Copilot failed to generate responses in three of the 10 evaluated cases because of content-filtering restrictions.</p><p><strong>Conclusions: </strong>AI software programs generated structured and clinically relevant dental treatment proposals; however, meaningful variability existed in diagnostic interpretation, restorability assessment, multidisciplinary integration, and extraction thresholds. OpenEvidence and ChatGPT-5 demonstrated greater agreement with the expert reference standard, although clinically significant diagnostic errors were observed across all evaluated systems. AI-generated treatment plans should therefore be regarded as adjunctive decision-support tools requiring specialist oversight before clinical implementation.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148800476","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":"Sequential custom facial prostheses developed through analog and digital workflows: A 5-year clinical report.","authors":"Steven E Handel, Hannah E Colburn, Jennifer V Sabol, Joshua Vess","doi":"10.1111/jopr.70224","DOIUrl":"https://doi.org/10.1111/jopr.70224","url":null,"abstract":"<p><p>Acquired facial defects can profoundly impair function, appearance, and psychosocial well-being. During the early phases of reconstruction, rapid tissue changes often limit definitive prosthetic rehabilitation, creating a therapeutic gap in patient care. This clinical report describes the sequential development of custom facial prostheses over a 5-year period for a 35-year-old man who developed a severe midfacial defect secondary to idiopathic purpura fulminans. Initial treatment focused on edema control, protection of healing tissues, and support of speech therapy through a custom compression mask, commissure splints, and intraoral prosthetic support. As the patient underwent multiple reconstructive procedures, repeated stereophotogrammetric acquisitions, digital superimposition, additive manufacturing, and analog sculpting techniques were used to fabricate successive prostheses that accommodated continual anatomical changes. Progressive incorporation of patient-specific digital data, including preinjury photographs and video-derived facial reconstructions, facilitated the development of increasingly realistic facial contours. The prostheses evolved from purely therapeutic devices into patient-centered restorations that addressed functional requirements (especially by promoting lymphatic draining and protecting the healing tissue from the external environment), surgical planning, and esthetic concerns. This clinical report demonstrates how iterative facial compression prostheses fabricated through combined digital and analog workflows can provide continuous functional and psychosocial support during prolonged multidisciplinary reconstruction. The described approach may offer a practical framework for rehabilitation of patients with complex facial defects undergoing staged surgical treatment.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148800474","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":"Prospective analysis of site-specific accuracy and error sources in dynamically navigated implant surgery.","authors":"Hongbo Wei, Miaomiao Tian, Yue Yuan, Dehua Li","doi":"10.1111/jopr.70217","DOIUrl":"https://doi.org/10.1111/jopr.70217","url":null,"abstract":"<p><strong>Purpose: </strong>This prospective study aimed to analyze the site-specific accuracy of dynamic navigation surgery and quantify the contributory factors of various error sources in implant placement.</p><p><strong>Materials and methods: </strong>Sixty-seven dental implants were placed in 45 patients selected consecutively. The accuracy was evaluated by comparing planned versus actual implant positions, measuring coronal, apical, and angular deviations. Most importantly, the discrepancies in interimplant distances were analyzed for the influence of system and operational errors on the overall inaccuracy.</p><p><strong>Results: </strong>The mean coronal, apical, and angular deviations were 0.98 ± 0.36, 1.23 ± 0.51, and 3.72 ± 3.23 mm, respectively. Beyond validating its overall precision, the findings offered two key advancements: First, the maxillary group demonstrated a significantly lower angle deviation (2.97° ± 1.49°) than the mandibular group (4.50° ± 4.24°, p < 0.05); the apical deviation in the anterior and posterior teeth was 1.01 ± 0.44 versus 1.30 ± 0.51 mm (p < 0.05); and the coronal deviation in the left and right jaws was 0.85 ± 0.34 versus 1.13 ± 0.33 mm (p < 0.05). Most importantly, the interimplant distance deviations were remarkably smaller (the coronal: 0.65 ± 0.53 mm and apical: 0.52 ± 0.30 mm) than global deviations (1.11 ± 0.37 and 1.26 ± 0.54 mm, respectively).</p><p><strong>Conclusions: </strong>An anatomical implant site significantly influenced the accuracy of dynamic navigation. The analysis of interimplant distances demonstrated that the overall error was predominantly attributable to registration error, whereas the system and the operational errors had a relatively small negative impact.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148800478","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":"Save or extract: A 10-year dual-center cohort comparing tooth preservation with implant replacement.","authors":"Sagar J Abichandani, Aneendita Dutta","doi":"10.1111/jopr.70222","DOIUrl":"https://doi.org/10.1111/jopr.70222","url":null,"abstract":"<p><strong>Purpose: </strong>To compare long-term outcomes, complications, patient-reported outcomes, and costs of tooth preservation (endodontic treatment followed by long-term prosthodontic restoration) versus extraction with implant replacement at the endodontic-prosthodontic interface.</p><p><strong>Materials and methods: </strong>A retrospective dual-center private-practice cohort of adults treated with a SAVE pathway or an IMPLANT pathway was evaluated over a 10-year study period with follow-up from 1.0 to 9.6 years after the index unit entered function. Time-to-failure, complications, patient-reported outcomes, and costs were analyzed using Kaplan-Meier/log-rank methods and Cox proportional hazards regression. A propensity-score inverse probability of treatment weighting (IPTW) sensitivity analysis was performed to address confounding by indication and the numerical imbalance between treatment pathways.</p><p><strong>Results: </strong>The adjusted analytic cohort comprised 859 cases with complete baseline covariates (594 SAVE; 265 IMPLANT); 860 cases were eligible for survival follow-up. Median follow-up was 3.1 years interquartile range (IQR 1.8-4.7; range 1.0-9.6). Failure occurred in 51 cases (37 SAVE; 14 IMPLANT). Estimated survival at 1 year was 97.8% for SAVE and 98.5% for IMPLANT, and estimated survival at the end of the observed follow-up window was 93.8% and 94.7%, respectively. There was no evidence of a survival difference between pathways (log-rank p = 0.785). Implant replacement was not associated with a lower adjusted hazard of failure (hazard ratio [HR] 0.87; 95% confidence interval (CI) 0.47-1.62; p = 0.666), whereas current tobacco use increased failure risk (HR 2.01; 95% CI 1.05-3.86; p = 0.036). Patient-reported oral health-related quality of life (OHRQoL) and satisfaction were comparable. IMPLANT involved more visits, greater downtime, and higher initial, total observed, and cost-per-year-of-function expenses (all p < 0.001).</p><p><strong>Conclusion: </strong>In this private-practice cohort, appropriately indicated tooth preservation and implant replacement demonstrated comparable survival and patient-reported outcomes within the observed follow-up period. The two options should not be treated as interchangeable substitutes; rather, selection should be individualized according to restorability, ferrule feasibility, periodontal and occlusal risk, strategic value, patient preference, maintenance burden, and cost trajectory.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148800493","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":"3D assessment of the marginal and internal gap and fracture load of ceramic surveyed inlays designed for removable partial denture support: An in vitro comparative study.","authors":"Mohammed M Gad, Amr A Mahrous, Shorooq K Almajhad, Amjaad M Almarzoogi, Majd A Alotaibi, Haidar Alalawi, Ahmad M Al-Thobity, Passent Ellakany, Shaimaa M Fouda, Moamen A Abdalla, Nadim Z Baba, Fahad A Al-Harbi","doi":"10.1111/jopr.70223","DOIUrl":"https://doi.org/10.1111/jopr.70223","url":null,"abstract":"<p><strong>Purpose: </strong>To assess the internal and marginal gaps and the fracture load of different machinable ceramics for an inlay acting as a support for a removable partial denture.</p><p><strong>Materials and methods: </strong>Sixty extracted human teeth (first maxillary premolar) were collected (n = 10 for each group). Intact teeth served as the negative control group, and there were six experimental groups: direct composite resin group (positive control); IPS Empress Direct composite (EDC); Feldspathic ceramic, VITABLOCS Mark II (FLD); Leucite glass-ceramic IPS Empress CAD (LGC); zirconia-reinforced lithium silicate Celtra Duo (ZLS); and zirconium oxide IPS E.max ZirCAD (ZRC). Disto-occlusal inlay cavities were prepared in the assigned teeth. For ceramic groups, teeth were scanned using a Trios III intraoral scanner (IOS). Inlays were virtually designed to incorporate a rest seat and then milled. The three-dimensional (3D) internal and marginal gaps were assessed with a replica technique combined with a second scan of the fit checker applied before inlay cementation. 3D inspection software was used for the superimposition of scans and the calculation of the internal and marginal gaps. Inlay restorations were cemented using a dual-polymerizing resin cement, then subjected to thermocycling and cyclic loading, followed by load till failure. The internal and marginal gap and fracture load values were recorded and statistically analyzed using One-way ANOVA with post hoc Tukey test for comparisons (α = 0.05). Failure patterns were analyzed.</p><p><strong>Results: </strong>The least significant marginal gap was seen with the ZRC group (68 ± 7 µm), while the ZLS group presented the highest marginal and internal gap values (135 ± 9, 199 ± 61 µm), respectively. Internal gap comparison revealed non-significant differences among the FLD, LGC, and ZRC groups. ZRC group demonstrated significantly the highest fracture load value (1830 ± 97 N). On the contrary, composite resin and FLD groups showed the lowest fracture load in comparison to the tested groups (p < 0.001). Failure pattern with the ZRC group revealed predominance of tooth failure, as well as adhesive failure associated with debonding of the restoration. LGC and ZLS groups revealed common performance with prevalence of tooth and restoration failure of mixed type, while both direct composite restoration and FLD groups showed predominately cohesive restoration failures.</p><p><strong>Conclusion: </strong>Indirect machinable ceramic surveyed inlays revealed acceptable gap values in addition to outstanding fracture load when compared to direct composite inlays.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148800495","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":"Early changes in interproximal contact and tactile sensitivity around implant-supported restorations: An 18-month prospective study.","authors":"Diana Lopez, Huilin Cao, Suhwan Bong, Jason D Lee, Jae-Hyun Lee, Sang J Lee","doi":"10.1111/jopr.70208","DOIUrl":"https://doi.org/10.1111/jopr.70208","url":null,"abstract":"<p><strong>Purpose: </strong>To longitudinally assess the frequency and magnitude of interproximal contact loss (ICL) between implant crowns and adjacent teeth, and changes in tactile sensitivity thresholds around single implant restorations compared with contralateral natural teeth over 18 months.</p><p><strong>Materials and methods: </strong>A prospective cohort study was conducted on 20 participants who were restored with a single posterior implant crown. Each restoration used a custom-milled titanium abutment and a screw-retained monolithic zirconia crown. Occlusion was standardized to light centric contacts on the implant crowns, and follow-ups were conducted at 1, 3, 6, 12, and 18 months. Interproximal contact tightness was quantified with a digital force gauge using 0.22-mm floss and open contact was measured at 0 N. Frictional forces were analyzed with repeated-measures and between-subjects ANOVA. Tactile sensibility was tested with foils with a thickness of 8-100 µm at implant and control sites, and detection of tactile sensitivity was modeled by logistic regression to estimate 50% detection thresholds. Peri-implant indices, modified Plaque Index, probing depth, and bleeding on probing were recorded to assess the health of the peri-implant soft tissue.</p><p><strong>Results: </strong>All contacts were closed at baseline; ICL occurred in two implant crowns (10%), confined to the mandible, and did not progress after 6 months. Interproximal frictional forces showed a nonsignificant time trend (p = 0.06) with no mesial-distal or tooth-group differences. For tactile sensitivity, controls outperformed implants at 24 µm (p = 0.02) at 3 months; by 18 months, group differences were nonsignificant. Detection thresholds improved from ∼39-40 µm at 3 months to ∼20 µm at 18 months (p = 0.045). At ≥80 µm, all participants detected contacts at all sites and timepoints. Peri-implant health remained stable; no implants demonstrated clinical signs consistent with peri-implantitis.</p><p><strong>Conclusions: </strong>Within the 18-month observation period, single posterior implant restorations under controlled occlusion demonstrated early adaptive proximal contact stability and functional tactile adaptation. Most contact changes occurred within the first 6 months, primarily in mandibular sites, emphasizing the importance of early monitoring. Peri-implant clinical parameters remained stable during follow-up. Clinically, maintaining occlusal contacts and regular follow-up can support proximal stability during the early phase of function.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148800435","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":"Improving the cytocompatibility and functionality of titanium implants by adjusting the electrolyte of the anodization method.","authors":"Zhengyang Xing, Rui Chao, Xitong Tu, Shanyong Zhang, Jie Ma","doi":"10.1111/jopr.70209","DOIUrl":"https://doi.org/10.1111/jopr.70209","url":null,"abstract":"<p><strong>Purpose: </strong>Titanium implants are widely used in prosthodontics, but their bioinert surfaces can limit early osseointegration. This study examined whether electrolyte-tuned anodization can tailor TiO₂ nanotube (TNT) coatings to improve in vitro osteogenesis, angiogenesis, and inflammation-related responses.</p><p><strong>Materials and methods: </strong>Titanium was anodized in three electrolytes to produce TNT, TNT-H, and TNT-B coatings. Morphology and roughness were assessed by scanning electron microscope, phase/chemistry by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), and wettability by contact angle. Cytocompatibility and functional responses were evaluated using bone marrow-derived mesenchymal stem cells, human umbilical vein endothelial cells, and RAW264.7 cells, including viability/adhesion assays, macrophage polarization and cytokine expression, and osteogenic/angiogenic assays.</p><p><strong>Results: </strong>TNT-B (mean pore diameter ∼188 nm) showed the most consistent improvements across endpoints, enhancing cell adhesion/proliferation, osteogenesis-associated markers, and angiogenesis-associated signals in vitro, while reducing pro-inflammatory cytokine expression and promoting M2-skewed polarization. TNT-H showed measurable responses versus TNT but did not outperform TNT-B in angiogenic assays under the tested conditions. XRD/XPS indicated minor Ti₆O- and defect-related signatures in TNT-B that are relevant to these responses. After annealing, corrosion resistance ranked TNT-H > TNT-B > TNT.</p><p><strong>Conclusions: </strong>Electrolyte modulation enables the controllable fabrication of TNT architectures and surface chemistry. TNT-B demonstrates promising in vitro performance but exhibits reduced electrochemical stability relative to TNT-H, highlighting a bioactivity-stability trade-off and the need for further optimization and validation before clinical use.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148714085","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 evaluation of the effects of laser and chemical denture disinfectants on the surface characteristics of CAD-CAM and conventional denture resins: An in vitro experimental study","authors":"Rania Moussa BDS, MSc, PhD,&nbsp;Passent Ellakany BDS, MSc, PhD,&nbsp;Shaimaa M Fouda BDS, MSc, PhD,&nbsp;Mai Salah El-Din BDS, MSc, PhD","doi":"10.1111/jopr.13952","DOIUrl":"10.1111/jopr.13952","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Purpose</h3>\u0000 \u0000 <p>The purpose of this study was to assess the effect of Ga-Al-Ar diode, Nd:YAG lasers, and chemical disinfectants (NaOCl, vinegar, and Corega) on surface roughness (Ra) and hardness (VHN) of polymethylmethacrylate (PMMA), thermoplastic polyamide, milled and 3D-printed denture base resins.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>About 432 specimens of PMMA, thermoplastic polyamide, milled, and 3D-printed resins were divided into six subgroups (n = 18): distilled water (control:C), Ga-Al-Ar diode laser (L1), Nd:YAG laser (L2), 1% sodium hypochlorite (NaOCl), vinegar (AA), and Corega (CR). Each specimen's Ra and VHN were measured. Surface topography assessment was done using scanning electron microscopy (SEM). Analysis was done using ANOVA and post hoc Tukey's test (<i>p</i> = 0.05).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>A significant difference was noted in Ra and VHN as affected by denture base materials, surface disinfectants, and their interaction (<i>p</i> &lt; 0.001). Results showed a significant increase in Ra of PMMA with NaOCL (<i>p</i> &lt; 0.001), AA (<i>p</i> = 0.005), and CR (<i>p</i> = 0.009), thermoplastic polyamide with L1 (<i>p</i> = 0.012), L2 (<i>p</i> = 0.015), NaOCL AA, and CR (<i>p</i> &lt; 0.001 each), milled resin with AA NaOCL, and CR (<i>p</i> &lt; 0.001 each), and 3D-printed resin with L1, NaOCl, AA (<i>p</i> &lt; 0.001 each), and CR (<i>p</i> = 0.008). The VHN increased in PMMA with NaOCL (<i>p</i> &lt; 0.001), AA (<i>p</i> = 0.044), and CR (<i>p</i> &lt; 0.001), thermoplastic polyamide with L1 (<i>p</i> = 0.037), milled resin with L1, L2, and CR (<i>p</i> &lt; 0.001 each), and 3D-printed resin with L1, NaOCl (<i>p</i> &lt; 0.001 each), and decreased with CR (<i>p</i> = 0.007).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>The tested properties showed variations affected by denture base material and surface disinfectants. Laser treatments induced smoother surfaces than chemical disinfectants. Laser improved the surface hardness of CAD-CAM resins, while chemical immersion improved that of PMMA.</p>\u0000 </section>\u0000 </div>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":"35 7","pages":"1142-1150"},"PeriodicalIF":3.6,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142299328","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":"Repair strength of 3D-printed denture base resins: Effect of surface treatment and repair material type","authors":"Mohammed M. Gad BDS, MSc,&nbsp;Hawra M. Al Hamad BDS,&nbsp;Fatimah M. Almohsin BDS,&nbsp;Shaimaa M. Fouda BDS, MSc, PhD,&nbsp;Sultan Akhtar MSc, PhD,&nbsp;Soban Q. Khan BSc, MSc, PhD,&nbsp;Ahmed Rahoma BDS, MSc, PhD,&nbsp;Faisal D. Al-Qarni BDS, MS, PhD,&nbsp;Nadim Z. Baba DMD, MSD, FACP,&nbsp;Fahad A. Al-Harbi BDS, MSD, DScD, FACP","doi":"10.1111/jopr.13925","DOIUrl":"10.1111/jopr.13925","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 \u0000 &lt;section&gt;\u0000 \u0000 &lt;h3&gt; Purpose&lt;/h3&gt;\u0000 \u0000 &lt;p&gt;The aim of the study was to investigate the effect of surface treatment and repair materials on the flexural strength of repaired 3D-printed denture base resins after thermal aging.&lt;/p&gt;\u0000 &lt;/section&gt;\u0000 \u0000 &lt;section&gt;\u0000 \u0000 &lt;h3&gt; Materials and Methods&lt;/h3&gt;\u0000 \u0000 &lt;p&gt;Bar-shape specimens (64 × 10 × 3.3 mm) were designed as intact (control) specimens while repair specimens were printed in sections with 2.5 mm space for repair material. Printing was performed with either ASIGA or NextDent denture base material. In each material, one group received no surface treatment, while other repair groups were subjected to one of three surface treatments: (1) monomer application, (2) aluminium oxide particles-abrasion, or (3) both methods (aluminum oxide particles-abrasion and monomer application). Pairs were fixed in a customized mold then repaired with either autopolymerizing acrylic resin or flowable composite (&lt;i&gt;n&lt;/i&gt; = 9). Repaired specimens were incubated for 48 h at 37°C in distilled water and then subjected to thermal cycling (5000 cycles). A 3-point bending test was used to evaluate the flexural strength using a universal testing machine, and mode of failure determined followed by fractured surface analysis using scanning electron microscope. Data were analyzed using ANOVA and post hoc Tukey test (&lt;i&gt;α&lt;/i&gt; = 0.05).&lt;/p&gt;\u0000 &lt;/section&gt;\u0000 \u0000 &lt;section&gt;\u0000 \u0000 &lt;h3&gt; Results&lt;/h3&gt;\u0000 \u0000 &lt;p&gt;Both resin materials showed a significant decrease in the flexural strength of repaired specimens when compared to control ones (&lt;i&gt;p&lt;/i&gt; &lt; 0.001). Groups with no surface treatment had significantly lower flexural strength than those with surface treatment (&lt;i&gt;p&lt;/i&gt; &lt; 0.001). Groups treated with monomer application, and with aluminum oxide particles abrasion plus monomer application had similar flexural strength values (&lt;i&gt;p&lt;/i&gt; &gt; 0.05), which were higher than those treated with aluminum oxide particles abrasion alone (&lt;i&gt;p&lt;/i&gt; &lt; 0.001). Specimens repaired with composite resin showed higher flexural strength than those repaired with auto-polymerized resin (&lt;i&gt;p&lt;/i&gt; &lt; 0.05) however, specimens treated with aluminum oxide particles abrasion alone had similar values for both repair materials (&lt;i&gt;p&lt;/i&gt; = 0.95). Adhesive failure was dominant in all repaired groups with auto-polymerized while cohesive and mixed were dominant with composite repair groups.&lt;/p&gt;\u0000 &lt;/section&gt;\u0000 \u0000 &lt;section&gt;\u0000 \u0000 &lt;h3&gt; Conclusion&lt;/h3&gt;\u0000 \u0000 &lt;p&gt;Surface treatment improved the repair strength of 3D-printed denture base resins. Using composite resin for repair shows better strength with dominant cohesive and mixed failure suggesting that surface treatment and composite repair are suitable procedures for 3","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":"35 7","pages":"1067-1077"},"PeriodicalIF":3.6,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142074341","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}