International Journal of Computerized Dentistry最新文献

{"title":"A systematic review of methodology for the creation of virtual 3D models for use in dental education and a narrative review.","authors":"Jonathan Robson, Andrea Rung, Miles McCusker, Gary Grant, Roy George","doi":"10.3290/j.ijcd.b4224867","DOIUrl":"10.3290/j.ijcd.b4224867","url":null,"abstract":"<p><strong>Objectives: </strong>Virtual Reality (VR) technologies can be used as a content-delivery system for the purposes of both entertainment and education. Remote and digital education has become ever so important in a world where global disruptive events such as pandemics and natural disasters can define access to a face-to-face learning environment. An important aspect of VR technologies for dentistry is the creation of digital 3D models. The primary of this review was to answer the focused research question, 'What software techniques are used in the creation of digital 3D models for use in dental education.'</p><p><strong>Methods: </strong>This study systematically evaluates current software and techniques used for creating digital 3D models in dental education using the Preferred Reporting Items for Systematic Reviews (PRIMSA).</p><p><strong>Results: </strong>The search strategies did not find any studies specific to the creation of dental-related 3D models. Therefore, this study for the first time provided an overview of common techniques of 3D model fabrication is discussed. Further some examples of methods of creating 3D models relevant to dentistry such armamentarium and anatomical oral structures have been discussed in considerable detail.</p><p><strong>Conclusion: </strong>The creation of 3D modelling is a rapidly evolving field with software updates and new programs being continually released. This work highlights fundamental lack of published work in the creation of 3D dental models for educational applications.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"0"},"PeriodicalIF":1.8,"publicationDate":"2023-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9849481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the marginal fit of lithium disilicate single crowns fabricated with the conventional (Emax press) and the CAD/CAM (Emax CAD) method: A systematic review and meta-analysis.","authors":"Aspasia Pachiou, Evangelia Zervou, Panagiotis Tsirogiannis, Nikitas Sykaras","doi":"10.3290/j.ijcd.b4224643","DOIUrl":"10.3290/j.ijcd.b4224643","url":null,"abstract":"<p><strong>Aim: </strong>The purpose of this systematic review and meta-analysis is to evaluate the marginal adaptation of single unit full coverage lithium disilicate fixed dental restorations fabricated with the conventional heat pressed technique and the digital CAD/CAM workflow.</p><p><strong>Materials and methods: </strong>This study is according to the Preferred Reporting Items for Systematic Reviews and Meta- Analyses (PRISMA) statement. study research was conducted in MEDLINE via PubMed and Cochrane Library databases together with a hand search of studies published until June 2022. The search terms were combining suitable Medical Subject Headings (MeSH terms) together with free text words in single or multiple conjunctions. A modified methodological index was used to assess the risk of bias of the included studies. A random effect model was applied to pool the effect estimates, and further assessment of the heterogeneity across studies using the Q test and the I2 metric was conducted. All statistical analyses were performed using Rstudio software, version 4.1.2, using the 'meta' package.</p><p><strong>Results: </strong>The electronic search and hand search identified 51 articles. Eighteen met the inclusion criteria and were included in the systematic review, 17 of which were in vitro and only one was an in vivo study. However, 17 of the initial 18 could be included in the meta-analysis, due to lack of statistical data in one of the in vitro studies. Statistical analyses were conducted by using the Rstudio software program. Meta-analysis was performed with the random effects model (α&#61;.05). No statistical difference was found between the two fabrication methods (p-value&#61;0.49).</p><p><strong>Conclusions: </strong>Although the mean marginal adaptation of lithium disilicate single crowns was found to be better with the heat-pressed technique, there was no statistical significance with the CAD/CAM fabricated restorations and both resulted in a clinically acceptable result. Nonetheless, more clinical studies are needed for safer conclusions.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"0"},"PeriodicalIF":1.8,"publicationDate":"2023-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9847183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"WITHDRAWN: Accuracy and reproducibility of tablet-based applications for three-dimensional facial scanning: an in-vitro study.","authors":"Deise Caldas Kühlman, Mohammed Almuzian, Christianne Coppini, Emad Eddin Alzoubi","doi":"10.3290/j.ijcd.b4170275","DOIUrl":"10.3290/j.ijcd.b4170275","url":null,"abstract":"<p><p>This article has been withdrawn at the request of the author(s).</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"0"},"PeriodicalIF":1.8,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9672996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Survival dependence of 3D-printed temporary materials on the filler content.","authors":"Robert Bauer,&nbsp;Julian Zacher,&nbsp;Thomas Strasser,&nbsp;Alois Schmid,&nbsp;Martin Rosentritt","doi":"10.3290/j.ijcd.b3759607","DOIUrl":"https://doi.org/10.3290/j.ijcd.b3759607","url":null,"abstract":"<p><strong>Aim: </strong>The aim of the present study was the evaluation of the in vitro performance and fracture force of 3D-printed anterior implant-supported temporary partial dentures (TPDs) with different filler content.</p><p><strong>Materials and methods: </strong>Identical anterior resin-based TPDs (tooth sites 11 to 13; n = eight per material) were 3D printed from methacrylate resins with different filler content. A cartridge polymethyl methacrylate (PMMA) material was used as a reference. After temporary cementation, combined thermal cycling and mechanical loading (TCML) was performed on all the restorations to mimic clinical application. Behavior during TCML and fracture force was determined, and failures were analyzed. Data were statistically investigated (Kolmogorov-Smirnov test, one-way ANOVA; post hoc Bonferroni, Kaplan-Meier survival; α = 0.05).</p><p><strong>Results: </strong>Failure during TCML varied between three failures and total failure during loading time. Mean survival time varied between 93 ± 206 x 103 cycles and 329 ± 84 x 103 cycles. Significantly different survival cycles between the individual materials could be determined (Mantel Cox log-rank test: chi-square: 21,861; degrees of freedom (df) = 4, P < 0.001). A correlation between filler level and survival cycles could be found (Pearson: 0.186, P = 0.065). Fracture values of the surviving TPDs varied between 499 and 835 N. Failures were characterized by fracture of the connector (n = 24) followed by fractures at the abutment (n = 10).</p><p><strong>Conclusions: </strong>TDPs showed different filler-dependent survival. Individual 3D-printed materials provided comparable or even better performance than a standard cartridge system and might be sufficient for temporary application of at least half a year.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"26 2","pages":"159-166"},"PeriodicalIF":1.7,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9521366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design, numerical simulation, and in vitro examination of a CAD/CAM-fabricated active orthodontic treatment element.","authors":"Anja Ratzmann,&nbsp;Mathias Christian Wessling,&nbsp;Karl-Friedrich Krey","doi":"10.3290/j.ijcd.b3759633","DOIUrl":"https://doi.org/10.3290/j.ijcd.b3759633","url":null,"abstract":"<p><strong>Aim: </strong>Orthodontic treatments with custom-made active elements may lead to more efficient treatment with fewer side effects. The objective of the present in vitro study was to determine whether individually constructed, mathematically simulated, and 3D-printed power chains could generate adequate forces for orthodontic tooth movement.</p><p><strong>Materials and methods: </strong>An individual measurement device was developed using a high-precision load cell, amplifier, and microcontroller for signal processing. Elastic chains were designed and subsequently printed from two different thermoplastic polyurethane (TPU) filaments and a thermoplastic elastomer (TPE) filament. With the CAD data, a finite element analysis (FEA) was performed to calculate the reactive forces to be expected at different activation levels. The measured force development of the test objects was compared with the results from the FEA.</p><p><strong>Results: </strong>The results showed a high precision of the measurement device, with an intraclass correlation coefficient (ICC) of 0.999 and a Dahlberg error of 0.05 N. The measured forces ranged from 196 to 681 g. There was a significant correlation between the measured and calculated forces (R 0.91 to 0.98).</p><p><strong>Discussion: </strong>In the present study, the fully digital workflow of producing an individualized active orthodontic treatment element, which developed almost exactly the force values calculated in the FEA, was shown. Future clinical use seems promising, in combination with fully individualized and digitally planned treatment approaches. This offers the possibility to integrate these insights from exemplary applications into patient-specific digital planning in orthodontics. The combination of CBCT root reconstruction, intraoral scans with customized brackets, and wires is the perfect starting point to add mechanical and numerical simulations. This would be the next step from shape-driven planning to force-driven planning. The goal is to reduce treatment time and negative side effects, eg, root resorption.</p><p><strong>Conclusion: </strong>The present in vitro study is the first to show the possible individualized construction and 3D printing of elastic chains exhibiting reproducible, predefined forces.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"26 2","pages":"125-136"},"PeriodicalIF":1.7,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9529058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accuracy of fully guided dental implant placement: A prospective clinical in-vivo investigation using intraoral scan data.","authors":"Insa Herklotz,&nbsp;Florian Beuer,&nbsp;Maria Bruhnke,&nbsp;Jan Zoske,&nbsp;Mats Wernfried,&nbsp;Heinrich Böse","doi":"10.3290/j.ijcd.b3762753","DOIUrl":"https://doi.org/10.3290/j.ijcd.b3762753","url":null,"abstract":"<p><strong>Aim: </strong>To compare the planned implant position (PIP) with the transferred implant position (TIP) after fully guided implant placements in single-tooth gaps.</p><p><strong>Materials and methods: </strong>Dental implant placements were planned using two different implant systems (Camlog Screw-Line [C-SL] and Straumann Bone Level Tapered [S-BLT]), and two different planning software programs (SMOP and coDiagnostiX). All implants were placed according to fully guided protocols, and intraoral scans were performed intraoperatively. For the comparison of PIP and TIP, scan data were imported to Geomagic Control X (GCX) software and accuracies were evaluated. Deviations were reported in a coordinate system (x- [mesiodistal], y- [vestibulo-oral], and z- [vertical] axis) at entry points and apices. Total deviations, including angular deviations, were calculated with GCX. For statistical analysis, the level of significance was set to P < 0.05.</p><p><strong>Results: </strong>Twenty-six patients received 26 implants. Mean 3D deviation at the implant's entry point was 0.61 mm ± 0.28 for C-SL and 0.63 mm ± 0.24 for S-BLT. For the implant's apex, mean 3D deviation of 0.96 mm ± 0.41 was documented for C-SL and 1.04 mm ± 0.34 for S-BLT. Mean angular deviation was 2.58 degrees ± 1.40 for C-SL and 2.89 degrees ± 1.12 for S-BLT. Statistical analysis revealed no significant differences between implant systems, but showed significant deviations regarding the z-axis, both at entry point and apex (P < 0.05).</p><p><strong>Conclusions: </strong>Fully guided implant placements in single-tooth gaps provide accurate results. Due to significant vertical deviations, reevaluation of both drilling and insertion depths prior to implant installation should be considered. Maintenance of 1.5- to 2-mm safety distances to critical structures was confirmed.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"26 2","pages":"137-148"},"PeriodicalIF":1.7,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9809378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predictable esthetics in hybrid and resin-based CAD/CAM restorative materials: Translucency as a function of material thickness.","authors":"Oliver Schubert,&nbsp;Tobias Graf,&nbsp;Josef Schweiger,&nbsp;Jan-Frederik Güth,&nbsp;Thomas Sciuk,&nbsp;Kurt-Jürgen Erdelt","doi":"10.3290/j.ijcd.b3762733","DOIUrl":"https://doi.org/10.3290/j.ijcd.b3762733","url":null,"abstract":"<p><strong>Aim: </strong>The CAM of esthetically pleasing monolithic dental restorations presents with specific challenges. One vital parameter to consider is the translucency of the materials. Previous studies have proven a correlation between translucency and material thickness for various all-ceramic materials. The aim of the present study was to assess and define the relationship between thickness and translucency in modern resin-based restorative materials.</p><p><strong>Materials and methods: </strong>Specimens fabricated from two resin nano-ceramics (Cerasmart, Lava Ultimate), a polymer-infiltrated ceramic network (Vita Enamic), and a polymethyl methacrylate (Telio CAD) were examined, representing these different material classes. For each material, 12 specimens (n = 12) were fabricated in five thicknesses (0.4, 0.7, 1.0, 1.3, and 1.6 mm; N = 240). The translucency was measured with a spectrophotometer. The total light transmittance for each specimen was calculated applying specialized software. Regression curves were fitted to the results and their coefficient of determination (R2) fit was determined.</p><p><strong>Results: </strong>Logarithmic regression curves showed the best R2 approximation (Cerasmart: R2 = 0.994; Vita Enamic: R2 = 0.978; Lava Ultimate: R2 = 0.997; Telio CAD: R2 = 0.997) to the light transmission values.</p><p><strong>Conclusions: </strong>The results of the present study indicate that the translucency of resin-based materials can be calculated using a mathematic approach to estimate their optical behavior. Cerasmart, Lava Ultimate, Vita Enamic, and Telio CAD exhibit a logarithmic relationship between material thickness and translucency. By determining material-specific coefficients for this logarithmic function, the resulting translucency can be computed for any given material thickness.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"26 2","pages":"149-158"},"PeriodicalIF":1.7,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9899518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dentronics: tooth cleaning with a tactile collaborative robot - an in vitro proof of concept.","authors":"Carolin Mönnink,&nbsp;Lukas Eich,&nbsp;Sami Haddadin,&nbsp;Meike Stiesch,&nbsp;Jasmin Grischke","doi":"10.3290/j.ijcd.b3762767","DOIUrl":"https://doi.org/10.3290/j.ijcd.b3762767","url":null,"abstract":"<p><strong>Aim: </strong>The aim of the present study was to compare the performance of a tactile collaborative robot programmed by a dental professional (DP) with that of a DP in the removal of surrogate plaque in vitro.</p><p><strong>Materials and methods: </strong>Six typodont teeth in articulated jaws were covered with surrogate plaque and cleaned by a DP with the help of a manual toothbrush (DP/manual) and an electric toothbrush (DP/electric). The experiment was repeated with the help of a collaborative seven-axis tactile robot programmed by a DP handling a manual toothbrush (robot/manual) and an electric toothbrush (robot/electric). All experiments were repeated five times, resulting in a total of N = 30 teeth in each group. Cleaning results were reported as the percentage of surface area with residual plaque.</p><p><strong>Results: </strong>The cleaning results of the DP and the robot showed no significant differences. However, electric toothbrushing was significantly less effective compared with manual toothbrushing (P < 0.05).</p><p><strong>Conclusion: </strong>The present in vitro study indicates that current robot technology may perform the removal of surrogate plaque as efficiently as a DP. In future, this may be helpful to release nursing staff from this time-demanding task that could possibly cause contagion or to support people with reduced motor skills or impaired vision in performing daily oral hygiene.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"26 2","pages":"167-174"},"PeriodicalIF":1.7,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9899519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of CBCT acquisition protocol and additional superimposed computerized optical impressions on the accuracy of root canal length measurements: an ex vivo study.","authors":"Jörg Philipp Tchorz,&nbsp;Valentina Gierl,&nbsp;Lucila Piasecki,&nbsp;Wilhelm Frank,&nbsp;Karl-Thomas Wrbas","doi":"10.3290/j.ijcd.b3759621","DOIUrl":"https://doi.org/10.3290/j.ijcd.b3759621","url":null,"abstract":"<p><strong>Aim: </strong>The purpose of the present investigation was to evaluate the accuracy of root canal length (RCL) determination according to CBCT acquisition protocol and evaluate the influence of additional superimposed computerized optical impressions.</p><p><strong>Materials and methods: </strong>CBCT scans with low-dose (LD) and high-definition (HD) protocols as well as computerized optical impressions of 30 extracted human molars were acquired. Sicat Endo software (Sicat) was used for CBCT RCL measurements with (LD+, HD+) and without (LD-, HD-) a superimposed optical impression. To evaluate the accuracy, absolute differences between test groups and the actual root canal length (ARCL) were calculated and statistically analyzed using the Wilcoxon rank sum test.</p><p><strong>Results: </strong>Absolute differences between the ARCL and the tested measurement methods varied significantly (P < 0.05). Both higher resolution and additionally superimposed computerized optical impression improved measurement accuracy. Mean differences compared with the ARCL were 0.26 mm (HD+), 0.34 mm (HD-), 0.43 mm (LD+), and 0.66 mm (LD-). 93.4% of all measurements in the HD+ group were within the limits of ± 0.5 mm.</p><p><strong>Conclusion: </strong>Both resolution and superimposition of additional computerized optical impressions have a significant influence on RCL measurements using CBCT.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"26 2","pages":"117-124"},"PeriodicalIF":1.7,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9529059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Digitally planned surgical crown lengthening in the esthetic zone.","authors":"Marcel Hanisch,&nbsp;Basti Wagner,&nbsp;Paul Leonhard Schuh","doi":"10.3290/j.ijcd.b3799799","DOIUrl":"https://doi.org/10.3290/j.ijcd.b3799799","url":null,"abstract":"<p><p>Surgical crown lengthening is one of the most common surgical procedures in periodontal practice. It is divided into functional and esthetic surgical crown lengthening. In general, surgical crown lengthening is a predictable periodontal surgical procedure. Its most common complication is excessive regression of the dentoalveolar complex coronally. Esthetic surgical crown lengthening can be performed predictably through prior digital planning, minimizing the risk of potential complications such as excessive regression of the dentoalveolar complex coronally. The present study reported in this article is a clinical case of surgical crown lengthening with digital planning to derive practical recommendations.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"26 2","pages":"175-182"},"PeriodicalIF":1.7,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9681337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}