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

{"title":"Influence of prosthesis type and intraoral scanner-based extraoral scanning protocol on the passive fit of CAD-CAM verification devices.","authors":"Toshiki Nagai, Yusuke Kuroda, Natalie Asavanant, Chao-Chieh Yang, Dean Morton, Wei-Shao Lin","doi":"10.1111/jopr.14097","DOIUrl":"https://doi.org/10.1111/jopr.14097","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the impact of different complete-arch digital scanning techniques and prosthesis types on the passive fit of computer-aided design and computer-aided manufacturing (CAD-CAM) verification devices.</p><p><strong>Materials and methods: </strong>Two different maxillary master casts with four multi-unit abutment (MUA) implant analogs (FP-1 and FP-3 prosthesis types) were used as the basis for fabricating verification devices through two impression techniques (OptiSplint and RevEX). Group 1 utilized digital scans of splinted scanbodies reinforced with a light-polymerizing acrylic resin and metal mesh on the FP-1 cast (OptiSplint technique), Group 2 employed the same impression technique as Group 1 on the FP-3 cast, Group 3 applied digital scans of reverse scanbodies connected to a passively fitting interim prosthesis on FP-1 cast (RevEX technique), and Group 4 used the same impression technique as Group 3 on FP-3 cast. A total of 40 milled verification devices were fabricated, with 10 devices allocated to each group. The misfit of verification devices was assessed using visual inspection, tactile sensation, and a one-screw test, with any disagreements between the two primary examiners resolved by a third evaluator. Agreement between the clinicians was assessed using Cohen's kappa statistics and percent agreement. The percentage of misfits was calculated for each group and compared between groups using Fisher's exact tests (α = 0.05).</p><p><strong>Results: </strong>The misfit analysis showed the lowest misfit (10%) in Group 1 (OptiSplint-FP1), followed by Groups 3 (RevEX-FP1) and 4 (RevEX-FP3) at 20%, and the highest (40%) in Group 2 (OptiSplint-FP3), with no significant differences between groups by Fisher's exact tests (p > 0.05). Odds ratios indicated six times higher misfit odds for FP-3 than FP-1 with OptiSplint, no difference for FP-1 versus FP-3 with RevEX (odds ratio = 1.0), and lower odds with RevEX compared to OptiSplint under FP-3 conditions (odds ratio = 0.375). Inter-examiner agreement was strong, with 90% concordance and a Kappa statistic of 0.66, demonstrating substantial consistency.</p><p><strong>Conclusion: </strong>OptiSplint is preferable for FP1 cases, whereas RevEX suits FP3 cases when intraoral-scanner-based extraoral workflows are used. Despite these recommendations, misfits occurred in every group, suggesting that a verification cast may be prudent when adopting these newer scanning approaches. Clinicians should consider fabricating an additional verification cast with splinted scanbodies or a clinically satisfactory interim implant prosthesis. This cast can confirm implant positions whenever modern scanbodies such as OptiSplint or RevEX are incorporated into the workflow.</p>","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":"144576813","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":"Correlation between facial widths and maxillary teeth dimensions based on facial and intraoral scanning in a Chinese population.","authors":"Kaijin Lin, Yongqing Guo, Jin Yang, Jianbin Guo, Dong Wu","doi":"10.1111/jopr.14093","DOIUrl":"https://doi.org/10.1111/jopr.14093","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to evaluate the efficacy of facial parameters (facial widths and proportions) in predicting the maxillary anterior teeth characteristics (teeth widths and ratios) through three-dimensional (3D) analysis.</p><p><strong>Materials and methods: </strong>This cross-sectional study was conducted at the Stomatology Hospital of Fujian Medical University. Facial parameters of participants were obtained using a 3D facial scanner and subsequently imported into specific software for automated measurement. Intraoral data was captured by TRIOS 3. Pearson correlation analysis was employed to identify relationships between facial and intraoral measurements. Linear regression was performed on significantly correlated variables, while t-tests evaluated the accuracy of esthetic proportions (golden proportion [GP], golden mean [GM], and recurring esthetic dental [RED]) in predicting combined central incisor width (CIW) and combined anterior teeth width (CAW) (α = 0.05).</p><p><strong>Results: </strong>A total of 147 volunteers participated in this study. Significant correlations for CIW and CAW were observed with facial widths (interpupillary width [IPW], intercanthal width [ICW], and intercommissural width [ICoW]) (p < 0.05). Regression equations based on these facial parameters revealed no significant differences between predicted and actual values for CIW and CAW. RED with ICW reliably predicted CIW without significant deviation from actual measurements (p > 0.05).</p><p><strong>Conclusions: </strong>Anterior teeth widths can be reliably predicted using regression formulas derived from facial widths. The RED proportion provides a reliable method for predicting CIW.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144568031","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 crown-to-abutment height ratio on fracture resistance of full-coverage anterior restorations.","authors":"Amirmohammad Babaeianfar, Hamid Neshandar Asli, Yasamin Babaee Hemmati, Mehran Falahchai","doi":"10.1111/jopr.14091","DOIUrl":"https://doi.org/10.1111/jopr.14091","url":null,"abstract":"<p><strong>Purpose: </strong>To assess the effect of crown-to-abutment (C/A) height ratio on fracture resistance (FR) of full-coverage anterior restorations.</p><p><strong>Materials and methods: </strong>In this in vitro study, 66 human maxillary central incisors were assigned to six groups according to their abutment height (n = 11): control (sound tooth), V4 (prepared vital tooth with 4 mm height), V4e (4 mm abutment with 4 mm height gain through elective endodontic treatment, fiber post, and core build-up), V6 (prepared vital tooth with 6 mm height), V6e (6 mm abutment with 2 mm height gain through elective endodontic treatment, fiber post, and core build-up), and V8 (prepared vital tooth with 8 mm height). Zirconia crowns with 10 mm height were fabricated for all teeth and cemented. After thermomechanical loading, the FR and fracture mode were assessed. Data were analyzed by independent t test, analysis of variance (ANOVA) with James-Howell test for pairwise comparisons, and Fisher's exact test (α = 0.05).</p><p><strong>Results: </strong>Among the experimental groups, V8 showed a significantly lower FR than other groups (p < 0.05). The FR of V6 was significantly lower than V4 (p < 0.001). V4 had a significantly higher FR than V4e (p < 0.001). However, the difference in FR was not significant between V6 and V6e (p = 0.408). V6e had the highest frequency of unfavorable fractures, and V4 had the highest frequency of favorable fractures.</p><p><strong>Conclusion: </strong>In the same restorative space, the minimum tested abutment height resulted in the highest FR in full-coverage anterior restorations, eliminating the need for invasive procedures to increase the abutment height.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144545780","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":"Under pressure: Unraveling the impact of occlusal overload on peri-implant health-A systematic review.","authors":"Sean Mojaver, Nupur Patel, Hector Sarmiento, Joseph P Fiorellini","doi":"10.1111/jopr.14088","DOIUrl":"https://doi.org/10.1111/jopr.14088","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the impact of occlusal trauma and excessive occlusal loading on dental implant health, with a focus on marginal bone loss and the incidence of peri-implantitis. The review aims to clarify how nonphysiological occlusal forces influence stress distribution around implants and contribute to clinical complications.</p><p><strong>Methods: </strong>A systematic search was conducted across PubMed, Scopus, Web of Science, and the Cochrane Library for studies published between January 2000 and October 2023. Inclusion criteria encompassed randomized controlled trials (RCTs), cohort studies, case-control studies, experimental investigations, and systematic reviews that investigated the effects of occlusal overload on peri-implant tissues. Of 160 initially identified references, 80 studies met the inclusion criteria and were analyzed for relevant outcomes.</p><p><strong>Results: </strong>Quantitative findings revealed that marginal bone loss associated with occlusal factors ranged from approximately 0.65 mm to 1.20 mm. In contrast, traumatic occlusal forces produced bone level changes of 1.0 mm to 3.0 mm and were associated with peri-implantitis rates ranging from 20% to 50%. Variations in occlusal scheme design and the presence of parafunctional habits such as bruxism were identified as significant modulators of biomechanical stress and clinical outcomes. The review also identified a synergistic relationship between mechanical overload and bacterial biofilm in accelerating peri-implant tissue breakdown.</p><p><strong>Conclusions: </strong>Excessive occlusal loading and trauma are critical contributors to marginal bone loss and peri-implantitis. These findings underscore the importance of meticulous occlusal management and individualized treatment planning, particularly in patients with parafunctional habits. Further high-quality studies are needed to establish evidence-based occlusal protocols that mitigate biomechanical risks and enhance long-term implant success.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144508991","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 substructure fabrication method and design on the fracture resistance properties of metal-ceramic restorations.","authors":"Young-Hoon Lee, Yoon-Hyuk Huh, Chan-Jin Park, Lee-Ra Cho, Kyung-Ho Ko","doi":"10.1111/jopr.14089","DOIUrl":"https://doi.org/10.1111/jopr.14089","url":null,"abstract":"<p><strong>Purpose: </strong>In metal-ceramic restorations, the substructure fabrication method and design may affect the prognosis of the prosthesis. This study evaluated and compared the fracture resistance of metal-ceramic restorations fabricated with different substructure fabrication methods using two different alloy powders and designs.</p><p><strong>Materials and methods: </strong>Titanium abutments prepared for maxillary central incisor specimens were divided according to the substructure fabrication method (CAS, casting; SLM, selective laser melting), alloy powder type (SLM1, higher Cr and Mo contents; SLM2, control), and substructure design (A, covering one-third of the palatal surface; B, covering two-thirds). Six groups (n = 10 per group) were prepared for fracture resistance analysis. Following surface air particle abrasion of the substructures, their surface morphologies were observed, and the surface roughness was measured. After ceramic veneering, cementation to a titanium abutment, and water storage (24 h), thermomechanical aging was performed. The fracture load was measured, failure mode analysis was performed, and the ceramic-substructure interface was observed. Statistical analysis was also performed.</p><p><strong>Results: </strong>The surface roughness was higher in the CAS group (compared to SLM1 and SLM2 groups), indicating that the fabrication method affected the fracture resistance. The substructure design and alloy powder composition had no effect. No surface roughness and fracture resistance differences were observed between the SLM1 and SLM2 groups. The most common fracture pattern was cervical ceramic fracture. No differences in fracture mode were observed between groups.</p><p><strong>Conclusions: </strong>The fabrication method affected the fracture resistance, with SLM leading to a higher resistance. The substructure design had no effect on the fracture resistance.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144498950","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":"Optical stability of 3D-printed and milled zirconia after artificial aging and immersion in liquids: An in vitro study.","authors":"Athanasios E Rigos, Matthew J Kesterke, Jenn-Hwan Chen, Eleana Kontonasaki, Elias D Kontogiorgos","doi":"10.1111/jopr.14090","DOIUrl":"https://doi.org/10.1111/jopr.14090","url":null,"abstract":"<p><strong>Purpose: </strong>To assess the impact of artificial aging and immersion in common liquids on the optical properties of 3D-printed and milled zirconia.</p><p><strong>Materials and methods: </strong>Monolithic zirconia discs (N = 100) were fabricated using two methods: 3Y-TZP for milling (e.max ZirCAD LT BL, Ivoclar Vivadent) and printable 3Y-TZP material (LithaCon 3Y 230) for 3D printing. The flat surfaces of the discs were mechanically polished. Color measurements were taken at baseline, after 10,000 thermal cycles and storage in various liquids for 20 days (T₁), and after 20,000 thermal cycles and storage for 40 days (T₂) using a spectrophotometer. Samples were stored in distilled water, tea, coffee, red wine, or Coca-Cola (n = 10 per group). Color differences (ΔE) were calculated between baseline and T₁ as well as baseline and T₂ using the CIEDE2000 formula, while contrast ratio (CR) and translucency parameter (TP) were calculated for each time point. Kruskal-Wallis nonparametric tests with Bonferroni corrections were used for comparisons between zirconia types, liquids, and time points. Shapiro-Wilk tests were applied for time-point comparisons (α ≤ 0.05).</p><p><strong>Results: </strong>At T₁ and T₂, significant differences in TP and CR were observed after storage in tea, coffee, and red wine for both zirconia types. ΔE values following immersion in distilled water remained below clinically perceptible levels, while tea, wine, and coffee resulted in unacceptable ΔE at T₁ and T₂.</p><p><strong>Conclusions: </strong>3D-printed and milled zirconia demonstrated comparable color stability after artificial aging and immersion in common liquids, with no significant differences between the materials in terms of color change (ΔE).</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144477477","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":"Pressure analysis during impression-making procedure with various tray designs using a digital occlusion analyzer: An in vitro study.","authors":"Minji Sun, Jaeyoung Kim, Seojune Choi, Hong Seok Moon","doi":"10.1111/jopr.14087","DOIUrl":"https://doi.org/10.1111/jopr.14087","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this study was to evaluate the pressures generated under various relief conditions during impression-making using the digital occlusal analyzer.</p><p><strong>Materials and methods: </strong>A customized device and impression trays were designed to measure pressure during impression-making. The left half of the tray consistently had a 0.5 mm relief without vent holes as the control group, while the right half featured varying relief and vent hole designs, resulting in six different trays. Two impression materials (Materials A and B) were loaded onto each tray, and relative pressure was measured using the digital occlusal analyzer (T-Scan Novus, Tekscan, Inc.). The pressure-reduction ratio of each experimental side was calculated. Two-way analysis of variance (ANOVA) was used to evaluate the effect of relief conditions and impression materials on the pressure-reduction ratio, followed by post hoc multiple comparisons with Bonferroni adjustment (α = 0.05).</p><p><strong>Results: </strong>The pressure-reduction ratio was significantly influenced by both impression material and relief amount (p < 0.001), with a significant interaction between the two factors (p < 0.001). In Material A, pressure reduction was significantly greater at 3 mm compared to 1 and 2 mm, whereas in Material B, pressure reduction increased progressively with greater relief amount. Regarding vent hole design, both impression material and vent hole configuration significantly affected pressure reduction (p < 0.001), with no significant interaction (p = 0.767). Designs with smaller but more widely spread vent holes demonstrated significantly greater pressure reductions, with significant differences observed only between the single-hole design and the two- or five-hole designs.</p><p><strong>Conclusions: </strong>Pressure reduction during impression making was influenced by both the viscosity of the material and the pressure-relief tray design. Forming vent holes yielded more consistent and effective results than adjusting the tray relief amount, highlighting the importance of a comprehensive approach that integrates both impression material selection and the application of various pressure-relief tray designs.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144477478","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":"Effects of complete-arch digital scanning techniques on the passive fit of CAD-CAM verification devices","authors":"Natalie Asavanant BSc, DDS, MSD,&nbsp;Chao-Chieh Yang DDS, MSD,&nbsp;Hawra AlQallaf BDM, MSD, MBA,&nbsp;Amirali Zandinejad DDS, MSc,&nbsp;Dean Morton DDS, MS,&nbsp;Toshiki Nagai DDS, MSD,&nbsp;Wei-Shao Lin DDS, PhD, MBA","doi":"10.1111/jopr.14084","DOIUrl":"10.1111/jopr.14084","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;To evaluate the impact of different complete-arch digital scanning techniques on the passive fit of computer-aided design and computer-aided manufacturing (CAD-CAM) verification devices.&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;A mandibular master cast with four multiunit abutment implant analogs was used as the basis for fabricating verification devices through three impression techniques. Group 1 employed a conventional open-tray impression technique using polyvinyl siloxane material, Group 2 utilized digital scans of splinted scanbodies reinforced with a light-polymerizing acrylic resin and metal mesh, and Group 3 applied digital scans of reverse scanbodies connected to a passively fitting interim prosthesis. A total of 60 CAD-CAM verification devices were fabricated, including 10 milled and 10 3D-printed devices across the three groups. The misfit of verification devices was assessed using visual inspection, tactile sensation, and a one-screw test, with any disagreements between the two primary examiners resolved by a third evaluator. Agreement between the clinicians was assessed using crosstabs, kappa statistics, and percent agreement separately for the visual and tactile evaluations. The percentage of misfits was calculated for each group and compared between groups using Fisher's exact tests (&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;Milled verification devices exhibited superior passive fit compared to 3D-printed devices across all groups. The Group 1 conventional open-tray technique with milled devices achieved a misfit percentage of 0%, significantly outperforming other groups. Group 3 reverse scanbodies with milled devices followed with a 20% misfit rate, while Group 2 splinted scanbodies with auxiliary features and milled devices showed the highest misfit rate at 60%. Among 3D-printed devices, Group 1 had the lowest misfit rate at 50%, followed by Group 3 at 60%, and Group 2 at 80%. The agreement between examiners was substantial, with a kappa statistic of 0.77 and 88% consistency. Statistical analysis revealed significant differences in misfit rates, highlighting the advantages of conventional methods and milled devices in achieving superior fit.&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;The conventional splinted open-tray impression technique, combined with milled verification devices, demonstrated superior fit and outperformed other impression and manufacturing techniques. The reverse scanbody protocol performed better than splinted scanbodies with a","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":"34 7","pages":"741-748"},"PeriodicalIF":3.4,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jopr.14084","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144334254","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":"Passivity of complete arch implant-supported fixed dental prostheses fabricated using a scan gauge system and conventional scan bodies: An in vitro study.","authors":"Stacey Kerzhner, Huan-Chun Lin, Frank Tuminelli","doi":"10.1111/jopr.14079","DOIUrl":"https://doi.org/10.1111/jopr.14079","url":null,"abstract":"<p><strong>Purpose: </strong>Intraoral scanning of an edentulous full arch with implants is subject to scanning errors. These errors may lead to a misfit of the final implant-supported restoration if a verification procedure is not employed. The purpose of this in vitro study was to compare the passivity of fit of metal frameworks on full arch multi-unit abutments (MUAs) fabricated using different intraoral impressions of full arch dental implants.</p><p><strong>Materials and methods: </strong>Maxillary and mandibular master casts were fabricated with Type IV gypsum with MUAs located 0.5 mm subgingivally. The maxillary cast consisted of two straight MUA anterior analogs and two distally angulated MUA posterior analogs. The mandibular cast consisted of six MUA straight analogs. Digital scans of the maxillary and mandibular master casts were completed by one operator with a Trios 4 intraoral scanner (3Shape). One set of scans was completed with scan gauges and the other with scan bodies. Screw-retained metal bars were fabricated from each of the four scans. In addition, two bars were fabricated with intentional misfit to serve as a negative control. All bars were milled with the same bar design dimensions. Twelve evaluators were asked to evaluate the bars and to provide a yes or no answer to three questions related to bar fit on the casts. A Fisher's Exact test was used to analyze the data.</p><p><strong>Results: </strong>Twelve evaluators completed a clinical assessment of each bar. In the maxilla, a significant number of prosthodontists considered the bar fabricated using the Nexus technology more accurate than the bar fabricated using conventional scan bodies (p < 0.001). Ten out of twelve (83.33%, p < 0.05) of evaluators reported that the maxillary Nexus bar passed the one screw test and had a clinically acceptable fit. Only 8.33% of evaluators felt that the bars fabricated from the conventional scan bodies had a passive fit and were clinically acceptable. In the mandible, a majority (75%, p < 0.05) of evaluators responded that the Nexus bars had a clinically acceptable fit, whereas none of the conventional scan body bars did. Only 16.66% of evaluators determined the conventional scan body bars to have a passive fit, while 58.33% (p = 0.089) determined that the Nexus bars did have a passive fit. All the evaluators deemed the bars fabricated with intentional misfit clinically unacceptable.</p><p><strong>Conclusion: </strong>Over 75% of the evaluators reported that both the maxillary and mandibular bars fabricated utilizing the Nexus scan gauge system achieved a clinically acceptable result. Future studies are needed that expand on more objective findings.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144295190","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":"Evaluation and comparison of occlusal interference markings with articulating papers of varying thicknesses: An in vivo study","authors":"Disha Oberoi MDS,&nbsp;Chethan Hegde PhD, MDS","doi":"10.1111/jopr.14086","DOIUrl":"10.1111/jopr.14086","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Purpose</h3>\u0000 \u0000 <p>This study aimed to evaluate the effectiveness of different thicknesses of articulating paper (100, 40, and 12 µm) in detecting occlusal interferences. The goal was to identify an optimal thickness range that could reliably mark clinically significant occlusal contacts, ensuring better outcomes in restorative procedures.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>An in vivo study was conducted with 13 patients requiring a single-tooth porcelain-fused-to-metal (PFM) crown restoration. Occlusal contacts were assessed using three thicknesses of articulating papers (100, 40, and 12 µm) during maximum intercuspation. Each thickness was applied sequentially, and any occlusal interference, identified by a “bull's eye” marking, was recorded. Statistical analysis was performed using chi-square test to assess differences in detection efficacy among the papers.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Of the 82 attempts to locate occlusal interferences, the 100 µm and 40 µm papers effectively marked contacts, with the 100 µm paper registering interferences in 58 attempts and the 40 µm paper in 60 attempts. The 12 µm paper, however, failed to mark interferences in 71 attempts. Statistical analysis showed no significant difference between 100 and 40 µm papers in detecting interferences.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>Both 100 and 40 µm articulating papers effectively detected occlusal interferences, with 100 µm providing larger, more visible marks and 40 µm offering greater precision in localized contact detection. In contrast, 12 µm paper showed limited efficacy under standard occlusal forces, underscoring the need for thicker papers in clinical settings for ease of visualization. Optimizing articulating paper selection can enhance diagnostic accuracy, facilitating more precise occlusal adjustments and improved patient outcomes.</p>\u0000 </section>\u0000 </div>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":"34 6","pages":"651-656"},"PeriodicalIF":3.4,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144267769","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}