{"title":"Outcomes of surveyed monolithic CAD/CAM zirconia crowns for removable partial denture abutments: A 7-year clinical study.","authors":"Ahmed M Aziz, Hiba Alshaibah, Adam Bin Husein","doi":"10.2186/jpr.JPR_D_24_00183","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_24_00183","url":null,"abstract":"<p><strong>Purpose: </strong>This retrospective clinical study aimed to evaluate the clinical outcomes of surveyed monolithic computer-aided design and computer-aided manufacturing (CAD/CAM) zirconia crowns for abutment teeth in removable partial dentures (RPDs).</p><p><strong>Methods: </strong>Patients who received monolithic surveyed zirconia crowns were clinically examined. The crowns were examined according to the modified United States Public Health Service criteria, and Kaplan-Meier survival was determined. The effect of different variables on the survival and success rates was assessed using Cox regression analysis (α = 0.05).</p><p><strong>Results: </strong>A total of 297 crowns of 275 patients were evaluated over a mean period of 7 years. The cumulative survival and success rates were 95.6% and 91.2%, respectively. Complications were in the form of secondary caries (n=12), minor chipping (n=9), and debonding (n=5). A higher number of failures was observed in the mandibular molars (P < 0.05).</p><p><strong>Conclusions: </strong>Surveyed monolithic zirconia crowns demonstrated high survival after 7 years of service. Monolithic zirconia is an excellent alternative to metal ceramic crowns for RPD abutments.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007143","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}
Ahmed Yaseen Alqutaibi, Rola Aljohani, Sarah Almuzaini, Mohammed Ahmed Alghauli
{"title":"Physical-mechanical properties and accuracy of additively manufactured resin denture bases: Impact of printing orientation.","authors":"Ahmed Yaseen Alqutaibi, Rola Aljohani, Sarah Almuzaini, Mohammed Ahmed Alghauli","doi":"10.2186/jpr.JPR_D_24_00263","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_24_00263","url":null,"abstract":"<p><strong>Purpose: </strong>This systematic review evaluated the effect of different printing orientations on the physical-mechanical properties and accuracy of resin denture bases and related specimens.</p><p><strong>Study selection: </strong>Utilizing PRISMA 2020 guidelines, a comprehensive search of PubMed, Web of Science, Cochrane, and Scopus databases was conducted until June 2024. Included studies examined the accuracy, volumetric changes, and mechanical or physical properties of 3D-printed denture bases in various orientations. Studies without relevant data were excluded. Bias risk was assessed using a modified CONSORT checklist.</p><p><strong>Results: </strong>This review included 24 studies on 3D-printed denture base resins, mainly based on stereolithography and digital light processing. Horizontal orientation (0°) generally enhanced flexural strength, while tilted and vertical orientations (90°) reduced it. Microhardness results varied due to differences in materials, layer thicknesses, and post-curing. Surface roughness was highest at 45°. Vertical orientation uses less material but is less time-efficient. Microbial adhesion, influenced by surface roughness, varied with printing orientation without a clear consensus on the optimal direction.</p><p><strong>Conclusions: </strong>Printing orientation significantly impacts the physical and mechanical properties and accuracy of 3D-printed resin dentures. A horizontal orientation (0°) improved flexural strength, while accuracy and adaptability were better at 45° and 90°. Surface roughness, translucency, and chemical stability are also affected by orientation, post-curing, and material choice. Although a 90° orientation reduces material use, it increases printing time. Standardized study designs are recommended for drawing definitive conclusions in future research.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007146","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":"Development of an antimicrobial tissue conditioner with quaternary ammonium methacryloxy silane (K18): An in vitro study.","authors":"Vrinda Gupta, Kyumin Whang","doi":"10.2186/jpr.JPR_D_24_00155","DOIUrl":"https://doi.org/10.2186/jpr.JPR_D_24_00155","url":null,"abstract":"<p><strong>Purpose: </strong>To determine the effects of K18 quaternary ammonium methacryloxy silane (QAS) on tissue conditioner materials and their antimicrobial properties.</p><p><strong>Methods: </strong>30% K18 QAS in methyl methacrylate (MMA; K18-MMA; 0%, 15%, and 20% w/w) was incorporated into a commercial tissue conditioner (Coe comfort). The degree of curing (Shore A hardness), hydrophilicity (contact angle), flow, liquid sorption, mass loss, and antimicrobial properties of Streptococcus mutans, Streptococcus sanguinis, and Candida albicans were determined. Statistical analysis included analysis of variance with Tukey HSD and Kruskal-Wallis with Bonferroni correction.</p><p><strong>Results: </strong>Hardness increased significantly at higher K18-MMA concentrations. The contact angles did not differ between the groups. Although the control and K18-containing tissue conditioner flow decreased significantly at each successive time point and with increasing K18 QAS MMA concentration, the flow was still within the ISO 10139-1 specifications for class 2 (high-flow) soft lining materials until 2 min 30 s. The highest liquid sorption happened between 1 and 4 weeks. The controls absorbed more acid than water or base, and the K18 groups absorbed more water and acid than base. With increasing K18-MMA concentration, the mass loss increased at all times and in all three media, except in base, after 4 weeks. Both 15% and 20% K18-MMA showed significant antimicrobial activity against S. mutans, S. sanguinis, and C. albicans.</p><p><strong>Conclusions: </strong>K18-MMA imparted significant antimicrobial properties to tissue conditioners against S. mutans, S. sanguinis, and C. albicans without compromising the flow, hardness, or hydrophilicity. However, K18-MMA addition led to increased water sorption and mass loss after 4 weeks.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007138","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":"Exploring the bio-mechanical behavior of PEEK and CFR-PEEK materials for dental implant applications using finite element analysis.","authors":"Kandula Uday Kumar Reddy, Aqshat Seth, Amol Vuppuluri, Piyush Chandra Verma, Suresh Kumar Reddy Narala, Polavarapu Jayakrishna Babu, Prabakaran Saravanan","doi":"10.2186/jpr.JPR_D_23_00296","DOIUrl":"10.2186/jpr.JPR_D_23_00296","url":null,"abstract":"<p><strong>Purpose: </strong>This study explored the bio-mechanical properties of polyether ether ketone (PEEK) and carbon fiber reinforced-PEEK (CFR-PEEK) as potential alternatives to traditional dental implant materials, such as titanium (Ti) and zirconia (ZrO<sub>2</sub>). Conventional implant materials often exhibit stress shielding leading to peri-implant bone loss and implant failure.</p><p><strong>Study selection: </strong>Finite element analysis using a three-dimensional computer-aided-design (3D CAD) model of the jawbone with various implant materials (titanium, zirconia, PEEK, and CFR-PEEK) incorporated was implemented to assess the effectiveness of PEEK and CFR-PEEK. Two loading conditions (50 and 100 N) were applied in centric (case-1) and eccentric (case-2) to mimic the oral loading conditions.</p><p><strong>Results: </strong>Titanium and zirconia implants were found to exhibit higher levels of stress shielding and therefore pose greater risks of bone loss and implant failure. Conversely, CFR-PEEK implants demonstrated more-uniform stress distributions that reduce the likelihood of stress shielding compared to their conventional counterparts; consequently, CFR-PEEK implants are particularly suitable for load-bearing applications. Furthermore, maximum strain values on PEEK-implanted cortical bone reached a state of adaptation, referred to as the \"lazy zone\" in which bone growth and bone loss rates are equal, indicating PEEK's potential for a long-term implant utilization.</p><p><strong>Conclusions: </strong>PEEK and CFR-PEEK implants are promising alternatives to conventional dental implants because they provide stress shielding and promote bone health. Improved stress distribution enhances long-term success and durability while mitigating complications, and highlights their applicability to dental implant procedures.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":"41-48"},"PeriodicalIF":3.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141080369","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":"Medical-dental collaboration on an exploratory research project on the correlation between cognitive and oral function: The ECCO project.","authors":"Kenji Fueki, Yuta Manabe, Keiichi Sasaki, Katsuhiko Kimoto, Mamoru Hashimoto, Takayuki Ueda, Kumiko Utsumi, Tomohisa Ishikawa, Kazuyoshi Baba, Manabu Ikeda, Takuo Kuboki","doi":"10.2186/jpr.JPR_D_24_00081","DOIUrl":"10.2186/jpr.JPR_D_24_00081","url":null,"abstract":"","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":"1-3"},"PeriodicalIF":3.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141633856","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":"Therapeutic effectiveness of keratinized mucosa augmentation for functioning dental implants: A systematic review and meta-analysis.","authors":"Se-Lim Oh, Shahriar Shahami, Lilia J Bernal-Cepeda, Yunting Fu, Man-Kyo Chung","doi":"10.2186/jpr.JPR_D_24_00002","DOIUrl":"10.2186/jpr.JPR_D_24_00002","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to provide the latest updates on the therapeutic effectiveness of keratinized mucosa (KM) augmentation using autogenous soft tissue grafts for dental implants retaining prostheses.</p><p><strong>Study selection: </strong>A systematic search of electronic databases was conducted on autogenous soft tissue grafts to create and/or augment KM for functioning dental implants. Two investigators independently extracted data from the selected 11 clinical studies, including 290 participants, from the initially retrieved 573 publications.</p><p><strong>Results: </strong>A lack of KM surrounding dental implants was associated with greater mucosal inflammation. A free gingival graft (FGG) was used to increase the KM width, and a connective tissue graft (CTG) was used to manage peri-implant mucosal recession (MR). The weighted mean gain in KM was 2.6 mm from the selected FGG studies, with a significant reduction in mucosal inflammation and no changes in crestal bone levels for up to 4 years. The weighted mean reduction in MR was 2 mm in selected CTG studies.</p><p><strong>Conclusions: </strong>A lack of KM negatively affects soft tissue health around dental implants. FGG was effective in increasing KM and reducing mucosal inflammation, whereas CTG was effective in decreasing MR.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":"4-11"},"PeriodicalIF":3.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141080370","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":"Immediate effects of simple palatal augmentation prosthesis in maximum tongue pressure and swallowing functions for acute stroke patients: An observational study.","authors":"Yuu Hashimoto, Yasunori Umemoto, Shigeru Suzuki, Yuri Miyazaki, Yukihide Nishimura, Ken Kouda","doi":"10.2186/jpr.JPR_D_23_00158","DOIUrl":"10.2186/jpr.JPR_D_23_00158","url":null,"abstract":"<p><strong>Purpose: </strong>Acute stroke often leads to dysphagia. In the oral stage of dysphagia, there is a potential for immediate benefit from using a palatal augmentation prosthesis (PAP). We investigated whether our quickly fabricated, simple, and expedited version of PAP would result in an immediate improvement in swallowing function after an acute stroke.</p><p><strong>Methods: </strong>We analyzed the records of stroke patients that were hospitalized between October 2019 and March 2022 and met the following criteria: they had a rehabilitation prescription and had paralysis of facial or hypoglossal nerves and either repeated salivary swallowing test ≤2 times or modified water swallow test ≤3, they were fasting, were within 3 weeks of onset, and had a simple PAP made for them. Outcomes included with/without PAP, maximum tongue pressure, repeated salivary swallowing test, and modified water swallow test on the day after starting to wear PAP was started. In addition, within one week, a videofluoroscopic examination was performed to measure the oral transit time, pharyngeal transit time, and penetration aspiration scale. Statistical analyses were performed using Wilcoxon signed-rank tests. Statistical significance was set at P < 0.05.</p><p><strong>Results: </strong>Fifteen patients met the inclusion criteria and were included in this study. The mean age of the subjects was 76.9 ± 9.0 years. The use of PAP significantly increased maximum tongue pressure (P < 0.0001*) and shortened oral transit time (P < 0.0091*). There were no significant differences among the other items.</p><p><strong>Conclusions: </strong>Simple PAP immediately increased the maximum tongue pressure and improved swallowing function during the oral stage.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":"76-81"},"PeriodicalIF":3.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141633855","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":"Marginal bone loss in dental implants: A literature review of risk factors and treatment strategies for prevention.","authors":"Yoshiaki Arai, Makiko Takashima, Nanaka Matsuzaki, Sho Takada","doi":"10.2186/jpr.JPR_D_23_00223","DOIUrl":"10.2186/jpr.JPR_D_23_00223","url":null,"abstract":"<p><strong>Purpose: </strong>Marginal bone loss (MBL) occurs in the periapical cervical bone after dental implant placement and abutment connection. MBL may not result in peri-implantitis; however, it is always accompanied by MBL. Recent studies have demonstrated that early MBL is a predictor of peri-implantitis. In this narrative review, we aimed to provide an evidence base for recommended treatment strategies for clinicians to prevent MBL.</p><p><strong>Study selection: </strong>We reviewed the recent literature and performed a narrative synthesis of the evidence, focusing on available systematic reviews and meta-analyses of implant marginal bone resorption.</p><p><strong>Results: </strong>The available evidence indicates that certain biological, material, and technical factors can influence MBL and consequently dictate the risk of developing peri-implant disease in later years. The order of the impact of the strength of each factor is unknown. Current recommendations to prevent MBL include controlling patients' smoking and hemoglobin A1c levels to sufficiently low levels before surgery and throughout their lifetime. Regarding the material, a platform-switching, conical-connecting implant system, and an abutment with a height of at least 2 mm should be selected. Placement should be performed using techniques that ensure sufficient soft tissue (keratinized gingival width > 2 mm, supracrestal tissue height > 3 mm), and non-undersized preparations in the cortical bone should be made with connected concave abutments during primary or secondary surgery. Patients should receive supportive peri-implant therapy during maintenance.</p><p><strong>Conclusions: </strong>MBL development is multifactorial and can be reduced by considering the biological, material, and technical factors.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":"12-20"},"PeriodicalIF":3.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141457632","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 denture use on occlusal force on abutment teeth in molar distal-extension edentulism.","authors":"Tomoya Gonda, Hitomi Togawa, Kazunori Ikebe","doi":"10.2186/jpr.JPR_D_23_00144","DOIUrl":"10.2186/jpr.JPR_D_23_00144","url":null,"abstract":"<p><strong>Purpose: </strong>The present clinical study aimed to investigate the load exerted on abutment teeth in patients with distal extension edentulism, with and without a removable partial denture (RPD).</p><p><strong>Methods: </strong>A total of 55 volunteers with distal extension edentulism who were fitted with an RPD participated in the present study. Occlusal force was measured by having the patients bite down on an occlusal force measuring sheet, and the occlusal forces on both the abutment teeth and the entire dentition with and without the RPD were compared using the Wilcoxon signed-rank test (P < 0.05). The occlusal forces on the abutment and non-abutment teeth were also compared.</p><p><strong>Results: </strong>The median total occlusal force with the RPD in place was significantly greater than that without the RPD, while the median occlusal force on the abutment teeth without the RPD in place was significantly greater than that on the abutment teeth with the RPD. The occlusal forces on the abutment teeth were significantly greater than those on the non-abutment teeth.</p><p><strong>Conclusions: </strong>Within the limitations of the present study, we found that the occlusal forces were greater on the abutment than the non-abutment teeth, and that RPDs may reduce the occlusal forces on abutment teeth.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":"91-96"},"PeriodicalIF":3.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141310862","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":"Association between prosthesis contour and peri-implantitis in patients compliant with supportive periodontal therapy: A retrospective cohort study.","authors":"Yu-Hsiang Chou, Wei-Lin Hsiao, Chun-Jung Chen, Ying-Chu Lin, Pei-Feng Liu, Kai-Fang Hu, Chih-Wen Cheng","doi":"10.2186/jpr.JPR_D_23_00236","DOIUrl":"10.2186/jpr.JPR_D_23_00236","url":null,"abstract":"<p><strong>Purpose: </strong>Poor contour of the implant restoration causes plaque accumulation and increases the risk of peri-implantitis. This study aimed to investigate whether the prosthodontic components of dental implants were associated with the prevalence of peri-implantitis.</p><p><strong>Methods: </strong>We enrolled 185 patients with 348 implants who underwent at least 1-year follow-up after the delivery of the prosthesis from February 2010 to January 2021. Demographic data of the patients and implants and the follow-up period were recorded. The emergence angle, type of cervical crown contour, and contour angle were analyzed using annual bite-wing radiographs. Peri-implantitis in this study was diagnosed if the peri-implant bone loss was greater than 2 mm between the bite-wing radiographs taken at baseline and the latest. Chi-square test, two-sample t-test, and multivariate logistic regression were used to investigate the differences and odds ratios between the peri-implantitis and non-peri-implantitis groups.</p><p><strong>Results: </strong>The incidence of peri-implantitis was 14.9% during a follow-up period of 1509 days after the delivery of the prosthesis for at least 1-year. Based on the prevalence of non-peri-implantitis and after adjusting for confounding factors, the risk factors identified were bone types for implants (native bone vs. alveolar ridge preservation: adjusted odds ratio = 2.43, P = 0.04). Sex, arch, and guided bone regeneration vs. alveolar ridge preservation have the potential for a statistical difference.</p><p><strong>Conclusions: </strong>Compared with implants at alveolar ridge preservation sites, implants in the native bone were more prone to peri-implantitis. Further randomized controlled trials are required to determine these associations.</p>","PeriodicalId":16887,"journal":{"name":"Journal of prosthodontic research","volume":" ","pages":"68-75"},"PeriodicalIF":3.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142093554","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}