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

{"title":"Effect of margin thickness and cement gap on the fabrication and fit accuracy of additively manufactured crowns in definitive resins with different filler content.","authors":"Mustafa Borga Dönmez, Gülce Çakmak, Çiğdem Kahveci, Amir H Nejat, Burak Yilmaz, Pinar Altinci","doi":"10.1111/jopr.70003","DOIUrl":"https://doi.org/10.1111/jopr.70003","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate how commercially available composite resins in varying filler content affect the fabrication and fit accuracy (trueness and precision) of additively manufactured (AM) definitive crowns with different margin thickness and cement gaps by comparing them to subtractively manufactured (SM) polymer-infiltrated ceramic crowns.</p><p><strong>Materials and methods: </strong>Two identical unprepared mandibular right first molars were prepared by an experienced prosthodontist for crowns with either 0.5 mm or 1.0 mm chamfer margins, verified using silicone indexes and a periodontal probe, and then digitized with an industrial-grade scanner. These scan files were used to design reference crowns with either 50-µm or 80-µm cement gaps in standard tessellation language (STL) format. These reference STLs were used to manufacture a total of 112 crowns, 28 crowns for each crown margin thickness-cement gap pair, using three additively manufactured resins with different filler ratios (AM-20-40%, AM-50%, AM-60%) and one SM polymer-infiltrated ceramic network (n = 7). After fabrication, an intraoral scanner was used to obtain STL files of each crown, the prepared typodont teeth, and each crown seated on its corresponding typodont. All STLs were imported into a metrology-grade 3-dimensional (3D) analysis software program to quantify the surface deviations (overall, external, intaglio, and marginal) of the crowns using the root mean square method and their fit with the average gap measurements. Precision was defined as the average of how much each measurement differed from the overall mean. All data were analyzed using generalized linear model analysis and Bonferroni-corrected post-hoc tests (Minitab Software, Version 17) with a significance level set at α = 0.05.</p><p><strong>Results: </strong>The accuracy of external surface deviations and the precision of the average gaps were affected by the interaction among all main factors. The interaction between material type and margin thickness influenced the accuracy of intaglio surface deviations, while the interaction between material type and cement gap affected the accuracy of marginal surface deviations; both interactions impacted the average gaps. In addition, the accuracy of overall deviations was affected by the interaction between margin thickness and cement gap (p ≤ 0.040). AM-20-40% crowns mostly had higher overall accuracy and SM crowns mostly had higher external and intaglio surface accuracy (p ≤ 0.033). AM-20-40% crowns mostly had higher fit accuracy, while the crowns with 0.5 mm-thick margins or 50-µm cement gap had lower average gaps (p ≤ 0.044).</p><p><strong>Conclusions: </strong>AM crowns in resin with low filler ratio (AM-20-40%) and SM crowns mostly had higher fabrication accuracy, which may enable fewer clinical adjustments and more reliable fabrication than AM crowns in resins with higher filler ratios (AM-50% and AM-60%). Only AM-20-40% and SM crowns with 0.5 m","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144660875","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":"Comparison of the ceramic adherence to alloys fabricated by different manufacturing techniques using two bond strength tests.","authors":"Elie E Daou, Nadim Z Baba","doi":"10.1111/jopr.14082","DOIUrl":"https://doi.org/10.1111/jopr.14082","url":null,"abstract":"<p><strong>Purpose: </strong>The objective of this study was to compare the shear bond strength (SBS) and Schwickerath (ST) tests for the adherence of ceramic to cobalt-chromium (Co-Cr) fabricated by different techniques, zirconia, and nickel chromium alloys.</p><p><strong>Material and methods: </strong>Five different core/veneer combinations were prepared: Group SLM: selective laser melted Co-Cr; Group SM: soft milled Co-Cr; Group C: cast Co-Cr; Group Zi: soft milled zirconia; and Group Ni: cast nickel chromium, layered with ceramic. Disk-shaped specimens (diameter 15 mm, thickness 2 mm) with a ceramic thickness of 2 mm were prepared for SBS, and bars of 25 × 3 × 0.5 mm with applied ceramic of 8 × 3 mm for ST (N = 100 and n = 20/group). Only half of the specimens from each group were thermocycled (5-55°C/5000 times). SBS test was applied to all the disks, and ST to the bars. Two-parameter Weibull distribution values, including shape (m) and scale (σ0), were calculated.</p><p><strong>Results: </strong>Thermal cycling had only a significant effect on SBS results for the SLM group (p = 0.017). A significant difference was found between testing techniques and materials (p < 0.001). The lowest value was reported for SLM in the SBS method (p < 0.001). Failure types were mostly mixed in SBS and adhesive in ST. The highest Weibull parameters were obtained for group C.</p><p><strong>Conclusion: </strong>Both the testing methodology and the specimens manufacturing technique influenced the bond strength of ceramic to different alloys. The aging process influenced the results in the laser-sintered group in large specimens.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144660874","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 gloss and micro-CT analysis of additively and subtractively manufactured resin composites and zirconia after simulated tooth brushing with different bristle types and toothpaste formulations: An in vitro study.","authors":"Ahmet Faruk Ertürk, Rafat Sasany, Seyed Ali Mosaddad, Merve Yelken Kendirci","doi":"10.1111/jopr.14099","DOIUrl":"https://doi.org/10.1111/jopr.14099","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to evaluate the effects of simulated tooth brushing with different bristle types and two toothpaste formulations on the surface gloss and structural integrity of additively (AM) and subtractively (SM) manufactured resin composites and zirconia.</p><p><strong>Materials and methods: </strong>A total of 160 specimens were prepared from four material groups: AM resin composite (AM-RC), AM zirconia (AM-Z), SM resin composite (SM-RC), and SM zirconia (SM-Z). Each specimen was assigned to one of four subgroups based on toothbrush bristle type and toothpaste formulation. Following polishing, the initial surface gloss was measured using a glossmeter. Specimens then underwent simulated tooth brushing (10,000 cycles) using a brushing simulator equipped with two toothbrush types and two toothpaste formulations. Surface gloss was re-evaluated post-brushing, and structural changes were analyzed using synchrotron radiation μ-CT at a voxel size of 0.65 µm. Data were statistically analyzed using analysis of variance (ANOVA) with α = 0.05.</p><p><strong>Results: </strong>Three-way ANOVA revealed a significant impact of all tested factors on surface gloss (p < 0.05). Before polishing, AM-Z and AM-RC exhibited higher gloss than SM-Z and SM-RC (p < 0.05). After polishing, AM-Z showed the greatest gloss enhancement. One-way ANOVA indicated that toothbrush bristle shape and toothpaste composition significantly influenced gloss reduction (p < 0.05), with round-end bristles and whitening toothpaste causing the highest gloss loss. Among materials, AM-Z exhibited the least gloss reduction (10.29 GU).</p><p><strong>Conclusions: </strong>Surface gloss retention is influenced by material type, toothbrush bristle shape, and toothpaste formulation. AM materials demonstrated superior resistance to gloss loss, while whitening toothpaste contributed to greater gloss reduction.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144638556","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 analyses of accuracy between digital and conventional impressions for complete-arch implant-supported fixed dental prostheses-A systematic review and meta-analysis.","authors":"Amal Alfaraj, Fatema Alqudaihi, Zohaib Khurshid, Osama Qadiri, Wei-Shao Lin","doi":"10.1111/jopr.14094","DOIUrl":"https://doi.org/10.1111/jopr.14094","url":null,"abstract":"<p><strong>Purpose: </strong>To compare the three-dimensional (3D) accuracy of digital (intraoral scanning and photogrammetry) and conventional implant impressions for complete-arch implant-supported fixed dental prostheses.</p><p><strong>Methods: </strong>A systematic search was conducted in electronic databases using relevant MeSH keywords to identify in vitro and in vivo studies comparing the 3D accuracy of digital versus conventional implant impressions. Eligible studies were included in a meta-analysis, with subgroup analyses conducted based on implant number (≤ 4 vs. > 4), impression type (intraoral scanners vs. photogrammetry), and study design (in vitro vs. in vivo). Publication bias was assessed using funnel plots and Egger's regression test. Risk of bias was evaluated using QUIN for in vitro studies, RoB 2 for randomized trials, and ROBINS-I for non-randomized studies.</p><p><strong>Results: </strong>A total of 37 studies were included, comprising 30 in vitro and 7 in vivo investigations, with the latter including 3 randomized clinical trials, 3 prospective studies, and 1 retrospective study. The studies assessed impression accuracy using 3D global deviation and/or coordinate measuring machine (CMM) analysis. Meta-analysis of 25 studies revealed no significant overall difference in accuracy between digital and conventional impressions (standardized mean difference [SMD]: -0.03; 95% CI: -0.20 to 0.14; p = 0.74), although substantial heterogeneity was present (I² = 68%). Subgroup analysis showed no significant difference for cases with ≤ 4 implants, while conventional methods were slightly favored in cases with > 4 implants (SMD: 0.22; 95% CI: 0.05 to 0.39; p = 0.01). Photogrammetry produced slightly greater accuracy than conventional impressions (SMD = 0.15; 95% CI 0.02 to 0.28), whereas intraoral scanners did not differ from conventional techniques. Funnel-plot asymmetry and Egger testing suggested publication bias. Certainty of evidence was judged moderate owing to methodological heterogeneity and imprecision. Descriptive findings indicated that 12 studies reported comparable accuracy between techniques, 11 favored conventional impressions, and 13 favored digital methods. One study noted implant number as a factor, with conventional methods more accurate for three implants and digital techniques superior for four or more. These results highlight both methodological variability and a lack of consensus in the current evidence.</p><p><strong>Conclusions: </strong>Digital impressions achieve accuracy comparable to conventional impressions in most clinical situations. Accuracy may decline when scanning arches with more than 4 implants, although photogrammetry appears to mitigate this effect. Well-designed in vivo studies that use standardized scanning and evaluation protocols are needed to confirm these findings and to define clinical thresholds for adopting specific digital workflows.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144638555","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":"Patient-centered outcomes of indirect CAD-CAM removable partial denture frameworks: A 2-year follow-up study.","authors":"Hend Mahmoud Hegazi, Amr Elkhadem, Ahmed Fayyad, Doaa Mahmoud Elkady, Maha Wagdy Elkerdawy, Arwa Sedky","doi":"10.1111/jopr.14100","DOIUrl":"https://doi.org/10.1111/jopr.14100","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to assess patient-centered outcomes of polyetheretherketone (PEEK) and cobalt chromium (CoCr) removable partial denture (RPD) frameworks, as well as to present detailed technical steps of digital designing and indirect production of metal and PEEK RPD frameworks.</p><p><strong>Materials and methods: </strong>This randomized, controlled, parallel-group clinical trial included 30 patients. The enrolled patients were partially edentulous with mandibular Kennedy Class I. They were randomly assigned to receive an indirect computer-aided design and computer-aided manufacturing (CAD-CAM) PEEK RPD as the interventional group, or an indirect CAD-CAM metallic (CoCr) RPD as the control group. Oral health-related quality of life (OHRQoL) and patient satisfaction were evaluated by the Oral Health Impact Profile questionnaire (OHIP-14) and patient satisfaction with the Lower Removable Denture Questionnaire (SLRD-Q), respectively. They were assessed at RPD insertion as a baseline (T0), 1 month (T1), 3 months (T2), 1 year (T3), and 2 years (T4) after insertion. Mann-Whitney and Friedman's tests were used for statistical analysis (p-value = 0.05).</p><p><strong>Results: </strong>All patients completed the follow-up period. No significant difference was found at all follow-up periods between both RPDs regarding both OHRQoL and patient satisfaction.</p><p><strong>Conclusion: </strong>Within the limitations of this short-term study, it can be concluded that indirect CAD-CAM PEEK and metallic RPDs are acceptable treatment options for Kennedy Class I edentulous mandibles, from the patient's perspective. Both RPDs improved OHRQoL to a degree that surpasses the minimally clinically important difference (MCID) after 2 years. Patient satisfaction improved as well.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144620993","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":"A latent variable deep generative model for 3D anterior tooth shape.","authors":"Chawalit Chanintonsongkhla, Varin Chouvatut, Chumphol Bunkhumpornpat, Pornpat Theerasopon","doi":"10.1111/jopr.14092","DOIUrl":"https://doi.org/10.1111/jopr.14092","url":null,"abstract":"<p><strong>Purpose: </strong>To introduce a 3D generative technology, PointFlow, which can generate 3D tooth shapes that integrate with conventional digital design workflows, and to evaluate its clinical applicability for tooth reconstruction.</p><p><strong>Materials and methods: </strong>A dataset of 1337 3D scans of natural anterior teeth was used to train a deep generative model (DGM) called PointFlow. This model encodes complex 3D tooth geometries into compact latent codes that efficiently represent essential morphological features. PointFlow models these latent codes as a continuous distribution, enabling the generation of new, realistic tooth shapes as point clouds by sampling from this latent space. The generative quality of the outputs was quantitatively evaluated using seven 3D shape metrics by comparing both the generated and training samples to a validation set. Clinical applicability was further explored by reconstructing 60 artificially damaged samples using the trained model.</p><p><strong>Results: </strong>The PointFlow model effectively represented the diversity of anterior tooth shapes. The generated tooth shapes showed superior performance on multiple generative metrics compared to the reference dataset. In the reconstruction task, the model successfully recovered the missing regions in the damaged samples. The average Chamfer Distance for the missing regions across all damage types was 0.2738 ± 0.095 mm.</p><p><strong>Conclusions: </strong>Deep generative models can effectively learn tooth characteristics and demonstrate potential in generating high-quality tooth shapes, suggesting their applicability for further clinical use.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144585466","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":"Assessing the influence of titanium dioxide nanotubes incorporation on thermal and thermomechanical characteristics of 3D-printed denture base resin.","authors":"Zaid Basil Al-Enbary, Ihab Nabeel Safi, Julfikar Haider","doi":"10.1111/jopr.14096","DOIUrl":"https://doi.org/10.1111/jopr.14096","url":null,"abstract":"<p><strong>Purpose: </strong>This study aims to evaluate the effects of adding titanium dioxide (TiO₂) nanotubes (NTs) to three-dimensional (3D) printed denture base resin on the thermal and thermomechanical properties, which have high clinical relevance.</p><p><strong>Materials and methods: </strong>TiO₂ NTs with dimensions of 30-70 nm in diameter and 2-4 µm in length were added to the denture base resin at concentrations of 0.0 (control), 1.0, 2.0, 3.0, 4.0, and 5.0 wt.%. A total of 120 samples were printed with 60 samples for hot-disc device tests (thermal conductivity [κ], thermal diffusivity [D] and volumetric heat capacity [ρC_p] tests) and 60 samples for thermomechanical analyzer (TMA) device tests (coefficient of thermal expansion [CTE, α], thermal strain [ϵ], and elastic modulus in response to temperature changes). The collected data were analyzed with ANOVA followed by Tukey's post hoc test (α = 0.05).</p><p><strong>Results: </strong>The results revealed that increasing the TiO₂ NT concentration improved all the thermal properties. However, in the thermomechanical tests, an improvement was observed only in the 1.0 wt.% and 2.0 wt.% TiO₂ NT composite groups, and a significant decline was observed in the remaining groups. Fourier Transform Infrared Spectroscopy (FTIR) results revealed no alteration in the chemical structure of the resin. However, the degree of conversion (DC) of the nanocomposites after polymerization was significantly affected. The samples tested via field emission scanning electron microscopy (FESEM) with energy dispersive x-ray spectroscopy (EDX) revealed an even distribution of the TiO₂ NTs in the 3D-printed samples.</p><p><strong>Conclusions: </strong>The improvement in the thermal and thermomechanical properties of the denture material could enhance patient satisfaction by providing better perceptions of hot and cold foods, reducing marginal deterioration, and increasing durability during mastication.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144585467","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":"Issue Information - Editorial Board","authors":"","doi":"10.1111/jopr.13712","DOIUrl":"https://doi.org/10.1111/jopr.13712","url":null,"abstract":"","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":"34 6","pages":"555-556"},"PeriodicalIF":3.4,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jopr.13712","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144573730","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":"Fracture load and retention of milled interim implant restorations fabricated on three types of abutments and two implant diameters: An in vitro study.","authors":"Dong-Hun Lee, Carme Riera, Qiucen Wan, Nareudee Limpuangthip, Jae-Hyun Lee, Sang J Lee","doi":"10.1111/jopr.14095","DOIUrl":"https://doi.org/10.1111/jopr.14095","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the fracture load and retention of subtractively manufactured interim restorations for single-unit implants of two diameters, using three interim abutment types: stock abutments, titanium base (Ti-base) abutments, and pre-milled polymethyl methacrylate (PMMA) abutments.</p><p><strong>Materials and methods: </strong>A total of 90 milled PMMA interim restorations were fabricated on three abutment types: (1) cement-retained restorations on stock abutments (stock group), (2) screw-retained restorations on Ti-base abutments (Ti-base group), and (3) screw-retained restorations fabricated on pre-milled PMMA abutments (pre-milled PMMA group). For fracture load testing, 60 restorations were allocated across implants with two diameters (Ø3.5 mm and Ø4.5 mm), forming six groups (n = 10 per group). Crown retention was evaluated by pull-out testing following cyclic loading on 30 restorations (n = 10 per abutment type), and failure modes were recorded. Statistical analyses were conducted (α = 0.05).</p><p><strong>Results: </strong>The Ø4.5-mm implants exhibited higher fracture loads than the Ø3.5-mm implants (p < 0.001). For both implant diameters, the pre-milled PMMA group had significantly lower fracture loads than the stock and Ti-base groups (p < 0.05). Nevertheless, all groups' fracture loads were significantly higher than the reported maximum occlusal force (p < 0.001). The pre-milled PMMA group demonstrated the highest pull-out force, significantly exceeding that of the stock and Ti-base groups (p < 0.001).</p><p><strong>Conclusions: </strong>The pre-milled PMMA group demonstrated superior retention but lower fracture load than the stock and Ti-base groups. The Ø4.5-mm implants exhibited higher fracture loads compared to the Ø3.5-mm implants. Despite the lower fracture load of the pre-milled PMMA group, all three abutment types surpassed the reported maximum occlusal force.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144576812","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":"Assessment of fit accuracy and retentive strength of additively manufactured zirconia crowns luted to Ti-base abutments with different resin cements: An in vitro study.","authors":"Rafat Sasany, Sultan Merve Uçar, Burak Yilmaz","doi":"10.1111/jopr.14098","DOIUrl":"https://doi.org/10.1111/jopr.14098","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Purpose: &lt;/strong&gt;This study investigated the influence of cement gap size on the marginal and internal fit, and cement gap size and type on retention of additively manufactured zirconia (AM-Z) crowns on titanium bases (Ti-base).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Materials and methods: &lt;/strong&gt;A total of 135 zirconia crowns were designed with three different cement gap sizes: 20 µm, 30 µm, and 40 µm (n = 45 per group). The crowns were additively manufactured using a lithography-based ceramic 3D printer (Cerafab, Lithoz GmbH, Austria) and a zirconia slurry (LithaCon 3Y 210, Lithoz GmbH, Austria). All crowns, Ti-base (RC Variobase, Straumann, Switzerland), and crown-Ti-base assemblies were scanned, and the marginal and internal gaps were measured using specialized software, following the triple scan protocol. Specimens were further divided into three subgroups based on the resin luting agent used for bonding the crowns to the Ti-bases (n = 15 per subgroup): Group PV21 used Panavia 21 (P21) (Kuraray Noritake Dental Inc., Japan), Group PV5 used Panavia V5 (PV5) (Kuraray Noritake Dental Inc., Japan), and Group MHA used Multilink Hybrid Abutment (Ivoclar Vivadent, Liechtenstein). After cementation, specimens were subjected to thermocycling between 5°C and 55°C. Pull-out forces between the additively manufactured zirconia (AM-Z) crowns and Ti-bases were measured using a universal testing machine. Variance analysis was conducted on root mean square (RMS) values for internal and marginal gaps, as well as pull-out forces (α = 0.05).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Results: &lt;/strong&gt;The one-way analysis of variance test revealed a statistically significant difference in marginal discrepancy values (p &lt; 0.001). A post-hoc Tukey analysis indicated that the marginal (25.9 µm) and internal discrepancy (24.6 µm) values associated with the 30 µm cement gap size were higher than those obtained with other cement gap sizes (p &lt; 0.01). No significant differences were found between the 20 µm and 40 µm cement gap sizes (p = 0.113). The 30 µm cement gap group demonstrated lower discrepancies. Both cement gap size and cement brand significantly influenced the marginal and internal fit, as well as the pull-out resistance of the crowns. The impact of the cement brand, the cement gap size, and their interaction significantly affected the retention between the Ti-bases and crowns (p &lt; 0.01). The use of P21 with a 30 µm gap resulted in significantly higher pull-out values than P21 with a 20 µm gap (p = 0.008) and P21 with a 40 µm gap (p = 0.004). Retention with a 40 µm cement gap was not significantly different from that with a 20 µm cement gap, regardless of the cement brand (p = 0.089). PV5 presented the lowest pull-out values across all cement gap sizes (p = 0.02).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Conclusion: &lt;/strong&gt;Cement gap size significantly affected the fit, and cement gap size and type significantly impacted the retention between AM-Z crowns and Ti-bases. Cement space of 30 µm and PV21 resin luting agent led ","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144576811","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}