Journal of Advanced Prosthodontics最新文献

{"title":"Rating criteria to evaluate student performance in digital wax-up training using multi-purpose software.","authors":"Takuya Mino,&nbsp;Yoko Kurosaki,&nbsp;Kana Tokumoto,&nbsp;Takaharu Higuchi,&nbsp;Shinichi Nakanoda,&nbsp;Ken Numoto,&nbsp;Ikue Tosa,&nbsp;Aya Kimura-Ono,&nbsp;Kenji Maekawa,&nbsp;Tae Hyung Kim,&nbsp;Takuo Kuboki","doi":"10.4047/jap.2022.14.4.203","DOIUrl":"https://doi.org/10.4047/jap.2022.14.4.203","url":null,"abstract":"<p><strong>Purpose: </strong>The aim of this study was to introduce rating criteria to evaluate student performance in a newly developed, digital wax-up preclinical program for computer-aided design (CAD) of full-coverage crowns and preliminarily investigate the reliability and internal consistency of the rating system.</p><p><strong>Materials and methods: </strong>This study, conducted in 2017, enrolled 47 fifth-year dental students of Okayama University Dental School. Digital wax-up training included a fundamental practice using computer graphics (CG), multipurpose CAD software programs, and an advanced practice to execute a digital wax-up of the right mandibular second molar (#47). Each student's digital wax-up work (stereolithography data) was evaluated by two instructors using seven qualitative criteria. The total qualitative score (0-90) of the criteria was calculated. The total volumetric discrepancy between each student's digital wax-up work and a reference prepared by an instructor was automatically measured by the CAD software. The inter-rater reliability of each criterion was analyzed using a weighted kappa index. The relationship between the total volume discrepancy and the total qualitative score was analyzed using Spearman's correlation.</p><p><strong>Results: </strong>The weighted kappa values for the seven qualitative criteria ranged from 0.62 - 0.93. The total qualitative score and the total volumetric discrepancy were negatively correlated (ρ = -0.27, <i>P</i> = .09, respectively); however, this was not statistically significant.</p><p><strong>Conclusion: </strong>The established qualitative criteria to evaluate students' work showed sufficiently high inter-rater reliability; however, the digitally measured volumetric discrepancy could not sufficiently predict the total qualitative score.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 4","pages":"203-211"},"PeriodicalIF":2.6,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/a1/6a/jap-14-203.PMC9444485.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40358828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of abutment neck taper and cement types on the amount of remnant cement in cement-retained implant restorations: an <i>in vitro</i> study.","authors":"Yeon-Hee Park,&nbsp;Kyoung-A Kim,&nbsp;Jung-Jin Lee,&nbsp;Tae-Min Kwon,&nbsp;Jae-Min Seo","doi":"10.4047/jap.2022.14.3.162","DOIUrl":"https://doi.org/10.4047/jap.2022.14.3.162","url":null,"abstract":"<p><strong>Purpose: </strong>The present study aims to analyze the effect of abutment neck taper and types of cement on the amount of undetected remnant cement of cement-retained implant prostheses.</p><p><strong>Materials and methods: </strong>Three neck taper angles (53°, 65°, 77°) and three types of cement (RMGI: resin-modified glass ionomer, ZPC: zinc phosphate cement, ZOE: zinc oxide eugenol cement) were used. For each group, the surface percentage was measured using digital image and graphic editing software. The weight of before and after removing remnant cement from the abutment-crown assembly was measured using an electronic scale. Two-way ANOVA and Duncan & Scheffe's test were used to compare the calculated surface percentage and weight of remnant cement (α = .05).</p><p><strong>Results: </strong>There were significant differences in remnant cement surface percentage and weight according to neck taper angles (<i>P</i> < .05). However, there were no significant differences in remnant cement surface percentage and weight on types of cement. No interaction was found between neck taper angles and types of luting cement (<i>P</i> > .05). The wide abutment with a small neck taper angle showed the most significant amount of remnant cement. And the types of luting cement did not influence the amount of residual cement.</p><p><strong>Conclusion: </strong>To remove excess cement better, the emergence profile of the crown should be straight to the neck taper of the abutment in cement-retained implant restoration.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 3","pages":"162-172"},"PeriodicalIF":2.6,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/a7/ef/jap-14-162.PMC9259346.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40537495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biomechanical evaluations of the long-term stability of dental implant using finite element modeling method: a systematic review.","authors":"Seyed Aref Hosseini-Faradonbeh,&nbsp;Hamid Reza Katoozian","doi":"10.4047/jap.2022.14.3.182","DOIUrl":"https://doi.org/10.4047/jap.2022.14.3.182","url":null,"abstract":"<p><strong>Purpose: </strong>The aim of this study is to summarize various biomechanical aspects in evaluating the long-term stability of dental implants based on finite element method (FEM).</p><p><strong>Materials and methods: </strong>A comprehensive search was performed among published studies over the last 20 years in three databases; PubMed, Scopus, and Google Scholar. The studies are arranged in a comparative table based on their publication date. Also, the variety of modeling is shown in the form of graphs and tables. Various aspects of the studies conducted were discussed here.</p><p><strong>Results: </strong>By reviewing the titles and abstracts, 9 main categories were extracted and discussed as follows: implant materials, the focus of the study on bone or implant as well as the interface area, type of loading, element shape, parts of the model, boundary conditions, failure criteria, statistical analysis, and experimental tests performed to validate the results. It was found that most of the studied articles contain a model of the jaw bone (cortical and cancellous bone). The material properties were generally derived from the literature. Approximately 43% of the studies attempted to examine the implant and surrounding bone simultaneously. Almost 42% of the studies performed experimental tests to validate the modeling.</p><p><strong>Conclusion: </strong>Based on the results of the studies reviewed, there is no \"optimal\" design guideline, but more reliable design of implant is possible. This review study can be a starting point for more detailed investigations of dental implant longevity.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 3","pages":"182-202"},"PeriodicalIF":2.6,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/dd/0b/jap-14-182.PMC9259347.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40537497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of dental implantation on bone mineral density distribution: a pilot study.","authors":"Damian Jae-Whan Lee,&nbsp;Eun-Sang Moon,&nbsp;Kenneth Stephen,&nbsp;Jie Liu,&nbsp;Do-Gyoon Kim","doi":"10.4047/jap.2022.14.3.143","DOIUrl":"https://doi.org/10.4047/jap.2022.14.3.143","url":null,"abstract":"<p><strong>Purpose: </strong>Masticatory loading triggers active bone remodeling, altering alveolar bone mineral density (BMD). While dental implants are placed to bear masticatory loading, their influence on changing bone properties has not been fully investigated. Objective of this pilot study was to examine whether the dental implantation has an effect on BMD distribution of bone by comparing dentate, edentulous, and edentulous patients with implants.</p><p><strong>Materials and methods: </strong>Cone beam computed tomography (CBCT) images of 19 partially edentulous patients (Dent), 19 edentulous patients (Edent), and 16 edentulous patients who received implants in the mandible (Edent+Im), were obtained. CBCT images were also obtained from 5 patients within Edent+Im group, before implant placement and after implant loading. Basal cortical bone region of the mandible was digitally isolated. A histogram of gray levels proportional to BMD was obtained to assess mean, histogram standard deviation (HSD), fifth percentile of low and high values (Low₅ and High₅) of the BMD distribution. Multivariate analysis of variance and paired t-test were used to compare the BMD parameters among the 3 dental status groups and between pre- and post-implantation, respectively.</p><p><strong>Results: </strong>Edentulous patients with implants had significantly greater HSD and High₅ values compared to edentulous patients (<i>P</i> < .013). All other comparisons were not significant (<i>P</i> > .097). Mean, HSD, and High₅ values significantly increased after receiving implants (<i>P</i> < .022).</p><p><strong>Conclusion: </strong>The current findings suggested that receiving dental implants promoted oral bone mineralization for edentulous patients. The longitudinal investigation could provide valuable information on understanding the effects of implantation on the behavior of oral bone quality.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 3","pages":"143-149"},"PeriodicalIF":2.6,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/be/7a/jap-14-143.PMC9259350.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40537494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative analysis on intaglio surface trueness, wear volume loss of antagonist, and fracture resistance of full-contour monolithic zirconia crown for single-visit dentistry under simulated mastication.","authors":"Yong-Kyu Kim,&nbsp;Hyung-In Yoon,&nbsp;Dae-Joon Kim,&nbsp;Jung-Suk Han","doi":"10.4047/jap.2022.14.3.173","DOIUrl":"https://doi.org/10.4047/jap.2022.14.3.173","url":null,"abstract":"<p><strong>Purpose: </strong>This analysis aimed to evaluate the intaglio surface trueness, antagonist's wear volume loss, and fracture resistance of full-contour crowns of (Y, Nb)-stabilized fully-sintered zirconia (FSZ), 4 mol% or 5 mol% yttria-stabilized partially sintered zirconia (4YZ or 5YZ) with high-speed sintering.</p><p><strong>Materials and methods: </strong>A total of 42 zirconia crowns were separated into three groups: FSZ, 4YZ, and 5YZ (n = 14). The intaglio surface trueness of the crowns was evaluated at the inner surface, occlusal, margin, and axial areas and reported as root-mean-square, positive and negative average deviation. Half of the specimens were aged for 120,000 cycles in the chewing simulator, and the wear volume loss of antagonist was measured. Before and after chewing, the fracture load was measured for each group. The trueness values were analyzed with Welch's ANOVA, and the wear volume loss with the Kruskal-Wallis tests. Effect of the zirconia type and aging on fracture resistance of crowns was tested using two-way ANOVA.</p><p><strong>Results: </strong>The intaglio surface trueness measured at four different areas of the crown was less than 50 µm, regardless of the type of zirconia. No significant <i>P</i> in wear volume loss of antagonists were detected among the groups (<i>P</i> > .05). Both the type of zirconia and aging showed statistically significant effects on fracture resistance (<i>P</i> < .05).</p><p><strong>Conclusion: </strong>The full-contour crowns of FSZ as well as 4YZ or 5YZ with high-speed sintering were clinically acceptable, in terms of intaglio surface trueness, antagonist's wear volume loss, and fracture resistance after simulated mastication.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 3","pages":"173-181"},"PeriodicalIF":2.6,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/6c/48/jap-14-173.PMC9259349.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40618504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trueness of 3D printed partial denture frameworks: build orientations and support structure density parameters.","authors":"Mostafa Omran Hussein,&nbsp;Lamis Ahmed Hussein","doi":"10.4047/jap.2022.14.3.150","DOIUrl":"https://doi.org/10.4047/jap.2022.14.3.150","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of the study was to assess the influence of build orientations and density of support structures on the trueness of the 3D printed removable partial denture (RPD) frameworks.</p><p><strong>Materials and methods: </strong>A maxillary Kennedy class III and mandibular class I casts were 3D scanned and used to design and produce two 3D virtual models of RPD frameworks. Using digital light processing (DLP) 3D printing, 47 RPD frameworks were fabricated at 3 different build orientations (100, 135 and 150-degree angles) and 2 support structure densities. All frameworks were scanned and 3D compared to the original virtual RPD models by metrology software to check 3D deviations quantitatively and qualitatively. The accuracy data were statistically analyzed using one-way ANOVA for build orientation comparison and independent sample t-test for structure density comparison at (α = .05). Points study analysis targeting RPD components and representative color maps were also studied.</p><p><strong>Results: </strong>The build orientation of 135-degree angle of the maxillary frameworks showed the lowest deviation at the clasp arms of tooth 26 of the 135-degree angle group. The mandibular frameworks with 150-degree angle build orientation showed the least deviation at the rest on tooth 44 and the arm of the I-bar clasp of tooth 45. No significant difference was seen between different support structure densities.</p><p><strong>Conclusion: </strong>Build orientation had an influence on the accuracy of the frameworks, especially at a 135-degree angle of maxillary design and 150-degree of mandibular design. The difference in the support's density structure revealed no considerable effect on the accuracy.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 3","pages":"150-161"},"PeriodicalIF":2.6,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/19/a4/jap-14-150.PMC9259348.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40537496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Marginal bone level change during sequential loading periods of partial edentulous rehabilitation using immediately loaded self-tapping implants: a 6.5-year retrospective study.","authors":"Jing Wang,&nbsp;Zhengchuan Zhang,&nbsp;Feilong Deng","doi":"10.4047/jap.2022.14.3.133","DOIUrl":"https://doi.org/10.4047/jap.2022.14.3.133","url":null,"abstract":"<p><strong>Purpose: </strong>A large number of studies have suggested the practicability and predictability of immediate implant function, but few studies have reported marginal bone level changes during sequential loading periods. The purpose of this study was to evaluate the marginal bone remodeling of immediately loaded self-tapping implants both at each time point and during each loading period between two time points.</p><p><strong>Materials and methods: </strong>The patients included in this retrospective study were treated with immediately loaded NobelSpeedy Replace implants between August 2008 and July 2009. Differences in the marginal bone level (MBL) at each time point and the marginal bone level change (ΔMBL) between two time points were analyzed with Bonferroni correction (<i>P</i> < .05).</p><p><strong>Results: </strong>Overall, 24 patients (mean age, 47.3 ± 12.8 years) with 42 immediately loaded implants and a median follow-up of 6.5 years (IQR, 67.8 months) were included. The cumulative survival rate after 10 - 12 years was 95.2%. Continuous but slow marginal bone loss was observed during long-term follow-up. MBL at both 7.5 years and 11 years was significantly lower than that at loading, 6 months, 2 years and 4 years (<i>P</i> < .05). No bone loss difference was found in any period before 4 years of follow up (<i>P</i> > .05). The loading period of 4 years to 7.5 years showed the largest ΔMBL compared to those of other time periods (<i>P</i> < .05).</p><p><strong>Conclusion: </strong>Slight bone loss occurred continuously, and more radical changes of marginal bone can be observed during the period of 4-7.5 years. Thus, long-term effective follow-up of immediately loaded implants is needed.</p>","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 3","pages":"133-142"},"PeriodicalIF":2.6,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/88/c1/jap-14-133.PMC9259351.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40618503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel reference model for dental scanning system evaluation: analysis of five intraoral scanners","authors":"Irina Karakas-Stupar, N. Zitzmann, T. Joda","doi":"10.4047/jap.2022.14.2.63","DOIUrl":"https://doi.org/10.4047/jap.2022.14.2.63","url":null,"abstract":"PURPOSE The aim of this in vitro study was to investigate the accuracy (trueness and precision) of five intraoral scanners (IOS) using a novel reference model for standardized performance evaluation. MATERIALS AND METHODS Five IOSs (Medit i500, Omnicam, Primescan, Trios 3, Trios 4) were used to digitize the reference model, which represented a simplified full-arch situation with four abutment teeth. Each IOS was used five times by an experienced operator, resulting in 25 STL (Standard Tessellation Language) files. STL data were imported into 3D software (Final Surface®) and examined for inter- and intra-group analyses. Deviations in the parameter matching error were calculated. ANOVA F-test and Kruskal-Wallis test were applied for inter-group comparisons (α = .05); and the coefficient of variation (CV) was calculated for intra-group comparisons (in % ± SD). RESULTS Primescan (matching error value: 0.015), Trios 3 (0.016), and Trios 4 (0.018) revealed comparable results with significantly higher accuracy compared to Medit i500 (0.035) and Omnicam (0.028) (P < .001). For intra-group comparison, Trios 4 demonstrated the most homogenous results (CV 15.8%). CONCLUSION The novel reference model investigated in this study can be used to assess the performance of dental scanning technologies in the daily routine setting and in research settings.","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 1","pages":"63 - 69"},"PeriodicalIF":2.6,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44138892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of scanning strategy on the accuracy of complete-arch intraoral scans: a preliminary study on segmental scans and merge methods","authors":"Hai Yen Mai, Hang-Nga Mai, Cheong-Hee Lee, Kyu-Bok Lee, So-yeun Kim, Jae-Mok Lee, Keun-Woo Lee, Du-Hyeong Lee","doi":"10.4047/jap.2022.14.2.88","DOIUrl":"https://doi.org/10.4047/jap.2022.14.2.88","url":null,"abstract":"PURPOSE This study investigated the accuracy of full-arch intraoral scans obtained by various scan strategies with the segmental scan and merge methods. MATERIALS AND METHODS Seventy intraoral scans (seven scans per group) were performed using 10 scan strategies that differed in the segmental scan (1, 2, or 3 segments) and the scanning motion (straight, zigzag, or combined). The three-dimensional (3D) geometric accuracy of scan images was evaluated by comparison with a reference image in an image analysis software program, in terms of the arch shape discrepancies. Measurement parameters were the intermolar distance, interpremolar distance, anteroposterior distance, and global surface deviation. One-way analysis of variance and Tukey honestly significance difference post hoc tests were carried out to compare differences among the scan strategy groups (α = .05). RESULTS The linear discrepancy values of intraoral scans were not different among scan strategies performed with the single scan and segmental scan methods. In general, differences in the scan motion did not show different accuracies, except for the intermolar distance measured under the scan conditions of a 3-segmental scan and zigzag motion. The global surface deviations were not different among all scan strategies. CONCLUSION The segmental scan and merge methods using two scan parts appear to be reliable as an alternative to the single scan method for full-arch intraoral scans. When three segmental scans are involved, the accuracy of complete arch scan can be negatively affected.","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 1","pages":"88 - 95"},"PeriodicalIF":2.6,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42685818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparative biomechanical study of original and compatible titanium bases: evaluation of screw loosening and 3D-crown displacement following cyclic loading analysis","authors":"Rimantas Ožiūnas, J. Sakalauskienė, D. Jegelevičius, Gintaras Janužis","doi":"10.4047/jap.2022.14.2.70","DOIUrl":"https://doi.org/10.4047/jap.2022.14.2.70","url":null,"abstract":"PURPOSE This study evaluated screw loosening and 3D crown displacement after cyclic loading of implant-supported incisor crowns cemented with original titanium bases or with three compatible, nonoriginal components. MATERIALS AND METHODS A total of 32 dental implants were divided into four groups (n = 8 each): Group 1 used original titanium bases, while Groups 2-4 used compatible components. The reverse torque value (RTV) was evaluated prior to and after cyclic loading (1,200,000 cycles). Samples (prior to and after cyclic loading) were scanned with a microcomputed tomography (micro-CT). Preload and postload files were superimposed by 3D inspection software, and 3D crown displacement analysis was performed using root-mean-square (RMS) values. All datasets were analyzed using one-way ANOVA and Tukey’s post hoc analysis. RESULTS Significant variations were observed in the postload RTV, depending on the titanium base brand (P < .001). The mean postload RTVs were significantly higher in Groups 1 and 2 than in the other study groups. While evaluating 3D crown displacement, the lowest mean RMS value was shown in the original Group 1, with the highest RMS value occurring in Group 4. CONCLUSION Within the limitations of this in vitro study and under the implemented conditions, it was concluded that the manufacturer brand of the titanium base significantly influenced screw loosening following the fatigue test and influenced 3D crown displacement after cyclic loading.","PeriodicalId":51291,"journal":{"name":"Journal of Advanced Prosthodontics","volume":"14 1","pages":"70 - 77"},"PeriodicalIF":2.6,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45255418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}