Journal of Prosthetic Dentistry最新文献

{"title":"Trueness and adaptation of screw-retained implant-supported monolithic zirconia crowns fabricated using 3-dimensional gel deposition.","authors":"Zhe Sun, Yuan Li, Jing Zhao, Yuanna Zheng","doi":"10.1016/j.prosdent.2024.10.005","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.005","url":null,"abstract":"<p><strong>Statement of problem: </strong>Implant-supported monolithic zirconia restorations manufactured using the additive 3-dimensional (3D) gel deposition technique have been introduced. However, studies determining the trueness and adaptation of implant-supported crowns made with the technique are lacking.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to evaluate the trueness and adaptation of implant-supported zirconia crowns fabricated using additive 3D gel deposition in comparison with zirconia crowns made with the widely used subtractive milling technique.</p><p><strong>Material and methods: </strong>Crowns were fabricated for wide-diameter titanium implants and wide-neck abutments. Self-glazed zirconia (SGZ) crowns were fabricated using 3D gel deposition (n=10) and from 2 brands of zirconia blanks, Wieland and Upcera, using subtractive milling (WMZ and UMZ, n=10). All crowns were digitalized by a scanner, and then 3D deviation analysis was applied. The trueness was assessed by root mean square (RMS). Marginal and internal adaptations were evaluated using the direct-view technique (DT) and replica technique (RT). The results were analyzed by using the 1-way ANOVA and Kruskal-Wallis statistical tests (α=.05).</p><p><strong>Results: </strong>The RMS and marginal discrepancy of SGZ exhibited the lowest values among the 3 groups (P<.05), and the 2 types of milled zirconia crowns had comparable RMS and marginal discrepancy values (P>.05). The internal discrepancy values of SGZ were significantly lower than those of WMZ and UMZ in all regions (P<.05). Compared with the WMZ, UMZ showed comparable internal discrepancy values in the axial and axio-occlusal transition regions (P>.05) but had significantly lower internal discrepancy value in the occlusal region (P<.05).</p><p><strong>Conclusions: </strong>The adaptation of 3 types of wide-diameter implant-supported zirconia crowns can meet the clinical requirements. Compared with the subtractive milling process, 3D gel deposition produced implant-supported zirconia crowns with improved trueness and adaptation.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622751","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":"Wear resistance of 3D printed occlusal device materials.","authors":"Nathaniel C Lawson, Pierpont Brown, Suleiman Hamdan, Aaron Alford, Amir H Nejat","doi":"10.1016/j.prosdent.2024.10.021","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.021","url":null,"abstract":"<p><strong>Statement of problem: </strong>Three-dimensional (3D) printing offers an efficient method of producing occlusal devices; however, their wear resistance is poorly understood.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to compare the wear resistance of flexible and rigid 3D printed occlusal device materials with milled and conventionally processed occlusal device materials.</p><p><strong>Material and methods: </strong>Blocks (n=8) of 3 flexible 3D printed materials (KeySplint Soft, NightGuard Flex 2, SmileGuard), 2 rigid 3D printed materials (KeySplint Hard, NightGuard Firm 2), 1 milled material (Ceramill A-Splint), 1 thermoform material (Erkoloc-Pro), 1 light-polymerized material (Eclipse Prosthetic Resin), 1 heat-polymerized material (Excel Formula Heat Cure Denture Base Material), and 1 autopolymerized material (Great Lakes Splint Resin Acrylic) were prepared and wet polished with 1200-grit SiC paper. The specimens were placed in a modified Alabama wear testing device with spherical zirconia antagonists. The devices applied a 20-N load and 2-mm horizontal slide for 400 000 cycles, and the test was run in a 33% glycerin solution. Following the wear test, the volumetric wear was measured with an optical profilometer. The Vickers microhardness of the materials was also measured (n=3). Volumetric wear and microhardness were compared with 1-way ANOVAs and Tukey post hoc analyses (α=.05).</p><p><strong>Results: </strong>Significant differences were found between the wear of the different occlusal device materials (P<.001). The rigid 3D printed materials experienced similar wear as the light-polymerized, heat-polymerized, and milled occlusal device materials. The autopolymerized and thermoformed occlusal device material experienced significantly more wear (P<.05). The flexible 3D printed materials had the significantly greatest wear (P<.05). A statistically significant, strong negative correlation between hardness and volumetric wear was found (r=-.93; P<.001).</p><p><strong>Conclusions: </strong>Rigid 3D printed occlusal device materials exhibit a high degree of wear resistance; however, flexible 3D printed occlusal device materials exhibit relatively low wear resistance.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622755","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":"Computer-aided prosthetic rehabilitation of a resected maxilla after mucormycosis using a quad zygomatic implant protocol with digital planning.","authors":"Rahul Koppaka, Subhabrata Maiti, Nabeel Ahmed, R P Abhinav, M Arun","doi":"10.1016/j.prosdent.2024.10.007","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.007","url":null,"abstract":"<p><p>The rehabilitation of patient function and esthetics is essential from a social and psychological point of view. After a maxillary resection, the supporting structures that help provide retention or stability to a removable prosthesis are lacking. An effective, functional, straightforward, comfortable, and esthetic prosthetic rehabilitation of a patient with a resected maxilla using a digital workflow is presented. The rehabilitation was done using a computer-aided design and computer-aided manufactured bar and clip-supported overdenture prosthesis over quad zygomatic implants.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622689","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 technique for gingival displacement before digital scanning.","authors":"Ernesto Amosso","doi":"10.1016/j.prosdent.2024.09.020","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.09.020","url":null,"abstract":"","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622684","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":"Sleep apnea and dysphagia in patients after a stroke recovering in convalescence rehabilitation.","authors":"Ryosuke Yanagida, Kohei Yamaguchi, Kazuharu Nakagawa, Kanako Yoshimi, Takami Hino, Ayumi Kisara, Haruka Tohara","doi":"10.1016/j.prosdent.2024.09.013","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.09.013","url":null,"abstract":"<p><strong>Statement of problem: </strong>Sleep apnea is prevalent among patients after a stroke and can complicate recovery, particularly in those with dysphagia. While studies have investigated sleep apnea in patients after a stroke in acute-care settings, its prevalence and impact of those in convalescent rehabilitation remain largely unknown.</p><p><strong>Purpose: </strong>The purpose of this clinical study was to investigate the prevalence and severity of sleep apnea among patients after a stroke in convalescent rehabilitation and to explore the relationship between the severity of sleep apnea and dysphagia.</p><p><strong>Material and methods: </strong>In total, 196 patients after a stroke hospitalized in a rehabilitation hospital in Chiba Prefecture, Japan were enrolled in this study. The participants had suffered a stroke and had been admitted for post-stroke rehabilitation after being discharged from acute-care hospitals. An overnight sleep test was administered with WatchPAT, which measured the apnea-hypopnea index (AHI), minimum SpO₂ (MinSpO₂), and 3% oxygen desaturation index (ODI3%). Functional oral intake level was assessed with the Functional Oral Intake Scale (FOIS). Statistical analyses were conducted by using multiple regression followed by the 2-sample t test, Kruskal-Wallis tests, and the chi-squared test (α=.05).</p><p><strong>Results: </strong>Among the initial 196 participants enrolled, 140 participants (78 men and 62 women; mean age, 73.3 ±12.4 years) underwent a sleep test, with only 91 completing it. Out of the 91 participants, 85 (93.4%) had sleep apnea, and the prevalence increased to 95.7% specifically among participants with dysphagia. Significant differences in Japan Coma Scale scores (P<.001) and modified Rankin Scale scores (P<.001) were observed between the tube-dependent (FOIS 1 to 3) and total oral diet (FOIS 4 to 7) groups. Multiple regression analysis revealed a significant association between AHI and BMI (P=.020), and AHI and FOIS (P=.007), adjusted for age, sex, and confounding factors.</p><p><strong>Conclusions: </strong>This study revealed a high prevalence of sleep apnea among patients after a stroke in convalescent rehabilitation, as well as a significant correlation between the severity of sleep apnea and dysphagia. Clinicians should consider sleep apnea management as a critical component of post-stroke rehabilitation, given its potential for improving swallowing function.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622711","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":"Time efficiency and cost of fabricating removable complete dentures using digital, hybrid, and conventional workflows: A systematic review.","authors":"Nada El Osta, Marion Bessadet, Noémie Drancourt, Cindy Batisse","doi":"10.1016/j.prosdent.2024.10.008","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.008","url":null,"abstract":"<p><strong>Statement of problem: </strong>Analysis of the cost and time efficiency of removable complete dentures (RCDs) fabricated using conventional and computer-aided design and computer-aided manufacturing (CAD-CAM) processes remains limited.</p><p><strong>Purpose: </strong>The purpose of this systematic review was to evaluate the time efficiency and cost of conventional, hybrid, and completely digital workflows throughout the entire process of RCD fabrication.</p><p><strong>Material and methods: </strong>Article selection followed the Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols (PRISMA-P) 2015 guidelines and was registered with the international prospective register of systematic reviews (PROSPERO). The bibliographic search covered the PubMed and Cochrane databases using keywords related to removable complete dentures, digital workflows, and economic factors and covered articles from January 2010 to June 2024. In total, 1188 articles were identified and assessed. A bottom-up search identified an additional 10 articles through cited works. Data on cost and time analyses were reported in a qualitative synthesis.</p><p><strong>Results: </strong>The qualitative synthesis included 8 articles published between 2015 and 2024 showing that digital and hybrid workflows generally reduced both clinical and laboratory time and overall costs compared with conventional workflows. The hybrid protocol required significantly less clinical time, with reductions ranging from approximately 1 to 4 hours. Hybrid and completely digital workflows reduced laboratory manufacturing time by approximately 6 to 7 hours compared with conventional workflows. Cost analyses revealed that digital and hybrid workflows were more profitable and cost effective than conventional workflows.</p><p><strong>Conclusions: </strong>The findings suggest that digital and hybrid workflows for RCD fabrication are more time efficient and cost effective than conventional methods.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622642","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 method for decontaminating a dental implant and components after abutment screw loosening: A clinical report.","authors":"Chandur P K Wadhwani, Paul S Rosen, Thomas G Wilson, Kwok-Hung Chung","doi":"10.1016/j.prosdent.2024.10.004","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.004","url":null,"abstract":"<p><p>Abutment screw loosening is the most common complication in single implant-supported crowns, typically remedied by simply reattaching the restoration, preferably using a new abutment screw. The internal aspect of the implant along with any other components should be decontaminated before reconnection. This clinical report provides information on the appropriate management of the decontamination process, as well as evidence of the foreign material found within the implant body.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142581889","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 machining method and margin design on the accuracy and margin quality of monolithic zirconia crowns.","authors":"Yi Zhou, Wenjia Chen, Han Zhu, Xiaochen Liu, Haiping Yang, Fuming He","doi":"10.1016/j.prosdent.2024.10.012","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.012","url":null,"abstract":"<p><strong>Statement of problem: </strong>The machining accuracy and marginal integrity of monolithic zirconia crowns with minimal invasive preparations may impact the long-term survival rate of tooth and periodontal health, but studies on the effect of machining method are lacking.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to digitally evaluate the machining accuracy and margin quality of monolithic zirconia crowns fabricated using gel deposition and conventional soft milling processes by comparing 2 different margin types.</p><p><strong>Material and methods: </strong>A total of 40 monolithic zirconia crowns were produced using gel deposition (Self-glazed Zirconia Group, SGG, n=20) and soft milling (Milled Zirconia Group, MG, n=20). Each group was further divided into 2 subgroups with different margin designs (chamfer and feather-edge). The trueness and fit of crowns were compared using root mean square (RMS) values. Furthermore, the margin quality was examined before and after final sintering with a scanning electron microscope (SEM). The Scheirer-Ray-Hare and 2-way ANOVA test analysis nonparametric and parametric data, respectively (α=.05).</p><p><strong>Results: </strong>The trueness analysis revealed that SGG had significantly lower RMS values for both the cameo and intaglio areas compared with MG (P<.001). In addition, crowns with a feather-edge margin exhibited significantly lower marginal RMS values than those with a chamfer margin (P<.01) according to the fit assessment. Followed by milling processes, SGG exhibited a constantly homogeneous microstructure compared with MG. Marginal defects were detected in both groups except for the SGG with the chamfer margin.</p><p><strong>Conclusions: </strong>SGG exhibited better accuracy associated with ductile-regime machining than MG, and SGG with chamfer margins displayed flaw-free margin areas. Moreover, the feather-edge margin showed improved marginal fit compared with the chamfer margin.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142576332","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 digital workflow for recording implant positions and jaw relation for implant-supported complete arch prostheses.","authors":"Min Liu, Xiao-Jiao Fu, Bei-Lei Liu, Hong-Chang Lai, Jun-Yu Shi","doi":"10.1016/j.prosdent.2024.10.002","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.002","url":null,"abstract":"<p><p>Conventional impression and jaw relation recording techniques for complete arch implant-supported fixed dental prostheses are complicated, but intraoral scanning offers alternatives to conventional procedures. This article presents a novel digital workflow for recording the relative positions of implants and jaw relation for complete arch implant-supported fixed dental prostheses.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142568078","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":"Prosthodontic rehabilitation of a patient after mucormycosis using a digitally fabricated hollow complete denture with 3D printed intramucosal inserts.","authors":"Sarthak Singh Tomar, Manu Rathee, Kritika Diwan, Aarti Sulekh","doi":"10.1016/j.prosdent.2024.09.022","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.09.022","url":null,"abstract":"<p><p>Denture retention in edentulous patients following resection for mucormycosis or carcinoma is challenging because of the lack of bony support. Traditional dentures are often unsatisfactory, and implants require complex bone grafting. This clinical report presents a novel approach using 3-dimensionally (3D) printed intramucosal inserts and a digitally fabricated hollow denture. The process involved conventional impressions, digital designing, and 3D printing of both the hollow denture and the custom intramucosal inserts based on mucosal thickness. This approach led to improved retention, functionality, and esthetics, offering a minimally invasive alternative with fewer complications to traditional dentures and implants.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142568105","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}