Journal of Prosthetic Dentistry最新文献

{"title":"Short-term and long-term success and survival rates of implants supporting single-unit and multiunit fixed prostheses: A systematic review and meta-analysis.","authors":"Mahdi Kadkhodazadeh, Reza Amid, Anahita Moscowchi, Ehsan Lakmazaheri","doi":"10.1016/j.prosdent.2022.12.012","DOIUrl":"10.1016/j.prosdent.2022.12.012","url":null,"abstract":"<p><strong>Statement of problem: </strong>Whether placing implants to replace each missing tooth or using implant-supported fixed partial dentures provides better outcomes is unclear.</p><p><strong>Purpose: </strong>The purpose of this systematic review and meta-analysis was to assess the success and survival rates of implants supporting single-unit and multiunit fixed prostheses by using conventional protocols for placement and loading in short- and long-term follow-ups.</p><p><strong>Material and methods: </strong>An electronic search was conducted in PubMed, Scopus, and Web of Science for studies published up to March 17, 2022. Comparative studies that reported the success or survival rates of both single-unit and splinted multiunit prostheses were considered for qualitative and quantitative analyses.</p><p><strong>Results: </strong>A total of 68 publications comprising 11 271 implants were included. Compared with the single prostheses, the splinted multiunit group showed no significant differences in implant success rates in the short-term (risk difference=-0.004; 95% confidence interval (CI)=-0.033 to 0.025; P=.780) and long-term (risk difference=0.003; 95% confidence interval (CI)=-0.029 to 0.034; P=.874) follow-ups. Significant statistical differences were also not found in terms of the survival rates of the 2 groups (short-term risk difference=-0.004; 95% CI=-0.031 to 0.023; P=.779, long-term risk difference=-0.002; 95% CI=-0.029 to 0.025; P=.887).</p><p><strong>Conclusions: </strong>Implants supporting single-unit or splinted multiunit prostheses seem to be a predictable treatment in terms of survival and success over short and long periods. Nonetheless, it seems that cantilever and nonsplinted multiunit prostheses should be used with more caution.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":"1226-1236"},"PeriodicalIF":4.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10708643","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 ultraviolet-protective 2-ethylhexyl salicylate incorporation on the mechanical properties of different maxillofacial silicone elastomers.","authors":"Necla Kılıçkaya, Merve Bankoğlu Güngör, Seçil Karakoca Nemli, Bilge Turhan Bal","doi":"10.1016/j.prosdent.2022.11.017","DOIUrl":"10.1016/j.prosdent.2022.11.017","url":null,"abstract":"<p><strong>Statement of problem: </strong>Whether the incorporation of ultraviolet-protective 2-ethylhexyl salicylate (UV-ES) affects the mechanical properties of different maxillofacial silicone elastomers, limiting the service life of facial prostheses, is unclear.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to examine the mechanical properties of different maxillofacial silicone elastomers incorporating different ratios of UV-ES.</p><p><strong>Material and methods: </strong>Three different ratios of UV-ES were incorporated into 3 different types of maxillofacial silicones (M511, TechSil-25, and A-2000), and the mechanical properties of the silicones were investigated. Silicone pigments were added to each silicone type to mimic skin color. Dumbbell-shaped specimens were fabricated for tensile strength, percentage elongation, and hardness measurements, and trouser-shaped specimens for tear strength measurement. A total of 240 specimens were prepared. UV-ES in 3 different ratios (1%, 2%, and 5%) and a control group of each silicone type were generated (n=10). The effects of maxillofacial silicone type and ultraviolet protective ratios on hardness, tensile strength, percentage elongation, and tear strength were examined by factorial ANOVA (α=.05).</p><p><strong>Results: </strong>The Shore-A hardness in the control and UV-ES added groups was not significantly different in M511 material (P>.05), and a statistically significant decrease was observed in all ratios in TechSil S-25 and A-2000 silicones (P<.05). After adding 1%, 2%, and 5% UV protective into the silicones, the tensile strength and elongation of TechSil S-25 silicone material decreased significantly (P<.05), while these mechanical properties of M511 and A-2000 were not affected by UV-ES addition (P>.05). Tensile and tear strength values of the silicone elastomers were highest for TechSil S-25.</p><p><strong>Conclusions: </strong>The mechanical properties of M511 and A-2000 silicone elastomers were not adversely affected by the addition of 1%, 2%, or 5% UV-ES.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":"1339-1344"},"PeriodicalIF":4.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10526773","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":"Trueness and surface characteristics of 3-dimensional printed casts made with different technologies.","authors":"Ryan Jin Young Kim, Su-Min Cho, Woo-Sun Jung, Ji-Man Park","doi":"10.1016/j.prosdent.2022.12.002","DOIUrl":"10.1016/j.prosdent.2022.12.002","url":null,"abstract":"<p><strong>Statement of problem: </strong>Three-dimensional (3D) printers should be capable of fabricating products with high accuracy for potential use in a wide range of dental applications. The trueness and surface characteristics of 3D-printed casts made with different technologies remain unclear.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to evaluate the trueness and surface characteristics of 4 types of dental casts printed using 6 different 3D printers.</p><p><strong>Material and methods: </strong>Four dental casts prepared for intracoronal and extracoronal restorations were printed using 6 different 3D printers-2 printers of each printing technology (FDM: Creator, Lugo; DLP: D2, ND5100; SLA: Form 2, Form 3). The printed casts were scanned to obtain standard tessellation language (STL) data sets that were superimposed onto the reference to evaluate their trueness (n=15). Trueness was measured based on overall deviations for each cast and for sectional deviations within the cavities. For qualitative evaluation, the surface characteristics of the 3D-printed casts were analyzed by using a digital camera, stereomicroscope, and scanning electron microscope. Statistical analyses were conducted using the Kruskal-Wallis test, followed by multiple Mann-Whitney U tests for pairwise comparisons among groups (α=.05).</p><p><strong>Results: </strong>The overall median trueness values were lowest with the Form 3 (27.9 μm), followed by the ND5100 (30.0 μm), Lugo (37.1 μm), D2 (41.4 μm), Form 2 (46.9 μm), and Creator (83.3 μm) (P<.05). Sectional deviations within the cavity were generally greater than overall deviation. Macroscopic and microscopic images showed that the reproduced casts had the smoothest surface with the SLA, followed by the DLP and FDM printers. Horizontal layers were more discernible with the FDM printer.</p><p><strong>Conclusions: </strong>The trueness of the 3D-printed casts was influenced by the type of tooth preparation and was printer dependent. Among the tested 3D printers, the Form 3 produced the most accurate casts, while the Creator produced the least accurate casts.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":"1324.e1-1324.e11"},"PeriodicalIF":4.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10578703","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 maxillary incisor width and craniofacial measurements: A cone beam computed tomography study.","authors":"Ra'fat I Farah","doi":"10.1016/j.prosdent.2024.09.007","DOIUrl":"10.1016/j.prosdent.2024.09.007","url":null,"abstract":"<p><strong>Statement of problem: </strong>Accurate prediction of maxillary central incisor width (CIW) is essential in prosthodontics for selecting appropriately sized denture teeth. While traditional methods exist, the digital era may offer more reliable techniques for anterior tooth selection.</p><p><strong>Purpose: </strong>The purpose of this study was to investigate the correlation between CIW and craniofacial measurements derived from cone beam computed tomography (CBCT) scans to identify predictors for CIW and examine possible sexual dimorphism.</p><p><strong>Material and methods: </strong>A retrospective analysis was conducted on 80 three-dimensional skull models (40 men, 40 women; age range: 20 to 48 years) generated from segmented CBCT scans. Measurements included CIW, interpterygoid hamulus distance, bi-orbital width, interorbital distance, and piriform aperture width. Statistical analyses comprised independent t tests, bivariate correlations, and multiple linear regression (α=.05).</p><p><strong>Results: </strong>Significant sexual dimorphism was observed in CIW, interpterygoid hamulus distance, and bi-orbital width (P<.05). CIW positively correlated with bi-orbital width (r=.75, P<.001) and piriform aperture width (r=.49, P<.001). Multiple regression analysis revealed bi-orbital width, and interorbital distance, along with sex, as significant predictors of CIW (R²=.59, P<.001).</p><p><strong>Conclusions: </strong>Bony bi-orbital width, interorbital distance, and sex can be used to estimate the maxillary CIW.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":"1312.e1-1312.e7"},"PeriodicalIF":4.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142348938","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":"Clinical performance of short and extrashort dental implants with wide diameter: A systematic review with meta-analysis.","authors":"Vanessa Felipe Vargas-Moreno, Michele Costa de Oliveira Ribeiro, Rafael Soares Gomes, Fernanda Faot, Altair Antoninha Del Bel Cury, Raissa Micaella Marcello-Machado","doi":"10.1016/j.prosdent.2023.01.004","DOIUrl":"10.1016/j.prosdent.2023.01.004","url":null,"abstract":"<p><strong>Statement of problem: </strong>Rehabilitation with wide-diameter reduced-length implants has become popular for patients with minimal vertical bone. However, a consensus on the benefits of this approach is lacking.</p><p><strong>Purpose: </strong>The purpose of this systematic review with meta-analysis was to evaluate the influence of wide compared with regular diameter on the clinical performance of short (<10 mm) and extrashort (≤6 mm) dental implants used for rehabilitations with single crowns, fixed partial dentures, or both, in the posterior region.</p><p><strong>Material and methods: </strong>A search in 6 databases was conducted to select randomized controlled trials (RCTs) and nonrandomized controlled trials (N-RCTs). Five meta-analyses were performed, where the risk ratio (RR) was evaluated. The certainty of evidence was evaluated, and the risk of bias was determined from the Joanna Briggs Institute checklist.</p><p><strong>Results: </strong>Fourteen articles were included, 272 wide- and 478 regular-diameter implants. One study presented a low, 3 an unclear, and 11 a high risk of bias. Meta-analyses showed no statistical difference: implant survival, short dental implants in N-RCTs (up to 1 year - RR 1.01 [0.98; 1.03], 1 to 5 years - RR 1.01 [0.94; 1.08], more than 5 years - RR 1.01 [0.97; 1.06]), extrashort dental implants in N-RCTs (RR 1.04 [0.90; 1.20]), RCTs (RR 1.05 [0.88; 1.25]); implant success in N-RCTs (RR 1.01 [0.97; 1.05]); prosthesis success in N-RCTs (RR 1.01 [0.97; 1.05]).</p><p><strong>Conclusions: </strong>Short and extrashort dental implants with a wide and regular diameter appear to be clinically appropriate options for implant-supported posterior restorations, with high survival, success, and prosthesis success rates.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":"1260.e1-1260.e13"},"PeriodicalIF":4.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9336783","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 learning curve for anterior and posterior implant placement using dynamic computer-assisted surgical implant placement in novice and experienced operators: An in vitro trial.","authors":"Pitsinee Kundaechanont, Pravej Serichetaphonges, Atiphan Pimkhaokham, Wareeratn Chengprapakorn","doi":"10.1016/j.prosdent.2024.10.025","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.025","url":null,"abstract":"<p><strong>Statement of problem: </strong>Dynamic computer-assisted surgical implant placement (dCAIS) facilitates precise implant placement through a real-time tracking system, enabling single-visit treatment. However, an understanding of the learning curve associated with dCAIS in terms of differences between anterior and posterior implant placement is lacking.</p><p><strong>Purpose: </strong>The purpose of this in vitro trial was to observe the learning curve for anterior and posterior implant placement in novice and experienced operators using dCAIS in a type-III bone model simulated maxilla.</p><p><strong>Material and methods: </strong>Eight participants, including 4 novice and 4 experienced operators, were randomly assigned in blocks to either the anterior or posterior placement group. Before the experiment, the participants received video-training. Each participant performed 4 single implant placements per session with a 7 ±1 day wash-out period, totaling 5 practice sessions. Three-way repeated-measures analysis of variance (ANOVA) and 2-way ANOVA were used to analyze the effects of practice sessions, operator experience, and implant location on operating time and placement deviation. The operating time, coronal, depth, and angle deviations in each session were recorded and analyzed using repeated-measures ANOVA to express the learning curve (α=.05).</p><p><strong>Results: </strong>The analysis of 160 implants showed significantly higher coronal and angle deviation in the posterior group than in the anterior group during the first and second practice session (P<.05), with no significant differences observed from the third to the fifth practice session; the anterior group exhibited consistent performance from the first practice session. Novice and experienced operators exhibited statistically different operating times, particularly during the first practice session (P<.05), with no differences in accuracy being observed (P>.05). Operating time decreased with the increasing number of practice sessions in all groups.</p><p><strong>Conclusions: </strong>A learning curve for placing anterior implants with dCAIS may not be necessary for either novice or experienced operators. However, in posterior implant placement, a minimum of 3 practice sessions was found beneficial for both novice and experienced operators.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142770067","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":"Impact of WhatsApp on improving denture care knowledge and the awareness of the relationship between edentulism and general health.","authors":"Wan Nor Hayati Wan Abd Manan, Dayang Nur Sharin Abg Abd Mohd Rizal, Farah Wajihah Borhan, Widya Lestari, Azlini Ismail, Muhd Firdaus Che Musa, Mohamad Shafiq Mohd Ibrahim, Judy Chia-Chun Yuan, Cortino Sukotjo","doi":"10.1016/j.prosdent.2024.11.004","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.11.004","url":null,"abstract":"<p><strong>Statement of problem: </strong>Denture wearers are susceptible to diseases related to denture hygiene and are more prone to develop systemic disease because of poor understanding and awareness of the impact of edentulism on general health.</p><p><strong>Purpose: </strong>The purpose of this clinical study was to evaluate the effectiveness of traditional chairside practice and WhatsApp in improving patient knowledge of denture care and their awareness of the impact of edentulism on general health.</p><p><strong>Material and methods: </strong>Sixty-two participants who attended the Polyclinic Kulliyyah of Dentistry, IIUM Kuantan in 2022 for removable prosthesis fabrication were recruited. The participants were randomized into 2 groups: control (traditional chairside) and intervention (WhatsApp) group. Video intervention was sent via WhatsApp to the participants. Pretreatment and posttreatment questionnaires were distributed from March to September 2022 to survey their sociodemographic data, knowledge of denture care, and awareness of the effect of edentulism on general health. Data were obtained and checked for normality using the Shapiro-Wilk test. Data were analyzed using the Mann-Whitney U and Wilcoxon-Paired Signed-Rank tests (α=.05).</p><p><strong>Results: </strong>Eighty-two percent of participants favored WhatsApp as a tool for receiving information and used it daily (66.1%). The level of overall knowledge and awareness increased in groups after denture insertion instruction. Participants' knowledge of denture care (P=.001) and awareness of the effect of edentulism on general health (P=.001) improved significantly in the WhatsApp intervention group compared with the control group.</p><p><strong>Conclusions: </strong>WhatsApp can be used as an alternative tool for improving denture care knowledge among denture wearers; increased awareness was observed with WhatsApp compared with the traditional chairside approach.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142770070","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":"Accuracy of a facebow record: A comparison between a conventional facebow and a smartphone 3D scanner.","authors":"Hasan Al Yousuf, Shengtao Yang, Robert Ault, Fei Liu, Luca Lepidi, Marta Revilla-León, Junying Li","doi":"10.1016/j.prosdent.2024.10.038","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.038","url":null,"abstract":"<p><strong>Statement of problem: </strong>Accurately transferring the maxillary cast to the articulator is an essential step in most prosthodontics procedures in both digital and conventional workflows. Recently, the use of a smartphone 3-dimensional (3D) scanner-based virtual facebow record has been reported, but its accuracy is unclear.</p><p><strong>Purpose: </strong>The purpose of this clinical study was to compare the trueness and precision of a virtual facebow record made with a smartphone 3D scanner with that of a conventional facebow technique.</p><p><strong>Material and methods: </strong>One hundred facebow records were obtained from 10 participants using a virtual facebow record made with a smartphone 3D scanner (VFR_SP) and with a conventional facebow record (CFR) (n=10). In the VFR_SP group, a printed facebow fork was used to obtain virtual facebow records by using a smartphone-based face scanner. For the CFR group, an analog facebow record was obtained and scanned by using an industrial scanner. A cone beam computed tomography (CBCT) scan with an aligned maxillary arch scan was used as the control for each participant. Three reference points were placed on the maxillary arch scan on the right first molar, left central incisor, and left first molar. Scans from each group were superimposed on the CBCT scan to determine trueness. Scans within each group were also superimposed on each other to determine precision. Linear deviation at the 3 reference points and the angular deviation of occlusal planes were measured using a Python script. The trueness and precision of the 2 groups were compared by using a linear mixed model to account for repeated measures (α=.05).</p><p><strong>Results: </strong>No significant linear trueness differences between the 2 groups were found (P>.05). However, the VFR_SP group showed significantly less angular deviation: 1.53 degrees for the virtual facebow and 2.03 degrees for the conventional facebow group (P=.046). Regarding precision, the VFR_SP group showed significantly less linear deviation: 1.59 mm for the virtual facebow group and 2.33 mm for the conventional facebow group (P<.001), as well as angular deviation: 1.03 degrees for the virtual facebow group and 2.17 degrees for the conventional facebow (P<.001).</p><p><strong>Conclusions: </strong>The VFR_SP group showed better accuracy compared with the CFR group. Further research with a larger sample size is needed.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142770066","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 impact of blood and bone debris at the implant-abutment interface on peak removal torque: Bridging clinical observations with laboratory evidence.","authors":"Yuxin Bai, Shuyan Wang, Jian Zheng, Shuang Song, Guanhua Zhang, Chao Xie, Kai Jiao, Yingliang Song, Prof Sijia Zhang","doi":"10.1016/j.prosdent.2024.10.029","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.029","url":null,"abstract":"<p><strong>Statement of problem: </strong>Three months after implant placement, difficulty was encountered in unscrewing the healing abutment within the normal torque range (<35 Ncm), resulting in the removal of the implant. Despite all attempts, the implant could not then be separated from the healing abutment. Retrospective analysis of intraoperative photographs revealed the presence of blood or bone debris within the implant before the healing abutment was placed; this was considered to be the likely cause of this phenomenon.</p><p><strong>Purpose: </strong>The purpose of the study was to explore the impact of blood or bone debris within the implant during surgical placement on the torque required for unscrewing the healing abutment.</p><p><strong>Material and methods: </strong>A total of 27 implants were divided into 3 groups based on whether blood, blood and bone debris, or nothing was added. An electronic torque wrench was used to uniformly tighten the implants and healing abutments to 10 Ncm. These implants were then stored in a constant-temperature environment in physiological saline. After 1, 2, and 3 months, 3 implants from each group were randomly selected for microcomputed tomography analysis. Subsequently, an opening torque test was conducted to measure the maximum torque required to unscrew the healing abutment. The study data were compiled using Microsoft Excel 2019 and statistically analyzed with a statistical software package. One-way ANOVA was used to determine significant differences among groups, specifically by comparing and analyzing the bone volume fraction and maximum removal torque (RTQ) within the microgap between implants and healing abutments (α=.05).</p><p><strong>Results: </strong>The in vitro simulated experiment revealed that the presence of blood mixed with bone debris led to an increase in high-density images within the microgap. Significant differences in the maximum removal torque were observed among the 3 groups 1, 2, and 3 months after in vitro placement (P<.05), indicating that blood and bone debris affected the torque required to unscrew the healing abutment.</p><p><strong>Conclusions: </strong>The presence of blood or bone debris in the microgap should be avoided to prevent an increase in the unscrewing torque.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142770069","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":"Removable denture use, fit, and all-cause mortality in older adults with reduced occlusal support: The OHSAKA study.","authors":"Tomoaki Mameno, Naoko Otsuki, Satoko Takeuchi, Ryohei Yamamoto, Kazunori Ikebe","doi":"10.1016/j.prosdent.2024.10.037","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.10.037","url":null,"abstract":"<p><strong>Statement of problem: </strong>As the global population ages, tooth loss among older adults has become increasingly prevalent, impacting oral function and overall health. Although removable dentures have been used to improve masticatory function, the long-term effects of denture conditions on mortality are unclear.</p><p><strong>Purpose: </strong>The purpose of this clinical study was to clarify the association between removable denture condition and the mortality rate in older adults with reduced occlusal support.</p><p><strong>Material and methods: </strong>This longitudinal study analyzed survival data (up to 2022) for 186893 individuals aged ≥75 years who underwent dental examinations through public healthcare services between 2018 and 2020. The participants were categorized into 10 groups (A1 to A3, B1 to B4, and C1 to C3) based on their occlusal support status using the Eichner index. Denture conditions were assessed by private practice dentists and classified into 3 categories: well-fitting, poorly fitting, and not used. Cox proportional hazards regression analyses were conducted to examine the association between denture conditions and mortality by considering the following control variables: age, sex, history of chronic diseases (hypertension, diabetes, hyperlipidemia, and dementia), smoking habits, and body mass index for the entire study population and within each of the B1 to B4 and C1 to C3 groups.</p><p><strong>Results: </strong>Significantly higher hazard ratios (HRs) for mortality were observed with occlusal support deterioration, poorly fitting dentures, and nonusage, with the peak observed in the C3 group with no dentures. The HRs (with 95% confidence intervals) of well-fitting dentures were consistently the lowest across all groups as follows: 0.98 (0.90 to 1.06) in B1, 1.02 (0.95 to 1.10) in B2, 1.11 (1.03 to 1.19) in B3, 1.14 (1.07 to 1.22) in B4, 1.15 (1.05 to 1.26) in C1, 1.28 (1.21 to 1.37) in C2, and 1.58 (1.46 to 1.72) in C3, with the A1 to A3 group as the reference. Poorly fitting or no dentures were associated with increased HRs in the Eichner groups B3 to C3, compared with well-fitting dentures.</p><p><strong>Conclusions: </strong>This large population-based cohort study found that well-fitting dentures were associated with lower mortality risk in older adults with reduced posterior occlusal support. Nonusage or poorly fitting dentures were associated with an increased risk of mortality as occlusal support deteriorated.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142770071","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}