The Journal of Prosthetic Dentistry最新文献

{"title":"Accuracy of tooth color determination by dental students using daylight-calibrated dental operatory lighting sources","authors":"Christos Labis, Irina Seceleanu, Kevin Rion, Alexander Hassel, Nicoleta Corcodel","doi":"10.1016/j.prosdent.2023.11.026","DOIUrl":"https://doi.org/10.1016/j.prosdent.2023.11.026","url":null,"abstract":"<h3>Statement of problem</h3><p>Lighting conditions are an essential factor for accurately determining tooth color. However, the ideal lighting conditions for determining tooth shade are rarely met and are difficult to quantify. While the use of a standardized daylight lamp D55 can improve accuracy, its high cost limits its use in dental offices. The use of modern operatory treatment units for tooth color determination is promising, as they now allow for the adjustment of light source settings such as color temperature and intensity. However, studies are needed to determine whether they provide accurate color determination.</p><h3>Purpose</h3><p>The purpose of this study was to assess the accuracy of visual tooth shade determinations under the adjusted light sources of 2 different dental treatment units in comparison with a standardized daylight lamp D55.</p><h3>Material and methods</h3><p>Dental treatment units from 2 manufacturers KaVoLUX 540 LED (LK) and LEDview Plus (LDS) were tested. The light sources of these units were adjusted to match daylight conditions. A daylight lamp (Dialite Color 7; Eickhorst &amp; Co. KG) was used as a control (D55). A total of 49 participants (median age of 25 years, 30 women) underwent the Ishihara screening and received standardized training calibration. A total of 2205 clinical visual tooth shade determinations were performed with the Toothguide Training Box using the Vita 3D-Master shade guide under the 3 different lighting types. Each participant had 15 color determinations made under each of the 3 light settings. Color differences were analyzed by using the Kruskal-Wallis, Wilcoxon rank-sum, and chi-squared tests (α=.05).</p><h3>Results</h3><p>The type of lighting used for tooth shade determination had no significant effect on the accuracy of selected shade based on the ΔE₀₀ metric (<em>P=</em>.133). Perfect matches were achieved in 50.8% of the cases under LK, 49.8% under LDS, and 53.6% under D55 light, with no significant difference among percentages (<em>P</em>=.315). Although there was a significant difference in time elapsed for shade determination by light type (<em>P=</em>.004), this difference was not clinically relevant (20.8 seconds for LK, 23.9 seconds for LDS, 21.9 seconds for D55).</p><h3>Conclusions</h3><p>The accuracy of color determination for both examined dental operatory lamps was found to be comparable with that of the standard D55 daylight lamp when adjusted to specific settings.</p>","PeriodicalId":501672,"journal":{"name":"The Journal of Prosthetic Dentistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139056967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A digital and cast-free workflow for fabricating a definitive hollow obturator prosthesis for a maxillectomy defect: A dental technique","authors":"Dan Ma, Xin Wang, Tingmin Zhang, Shizhu Bai","doi":"10.1016/j.prosdent.2023.11.011","DOIUrl":"https://doi.org/10.1016/j.prosdent.2023.11.011","url":null,"abstract":"<p>This article presents a novel digital and cast-free workflow for fabricating a definitive hollow obturator prosthesis. A digital altered cast is made after the framework-fitting appointment to maximize support. The framework, hollow obturator base, and teeth are digitally designed, additively manufactured, and then assembled precisely without a cast. This method simplifies the laboratory process, reduces human errors, and provides a prosthesis with high accuracy and good fit.</p>","PeriodicalId":501672,"journal":{"name":"The Journal of Prosthetic Dentistry","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138817146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accuracy of an optical robotic computer-aided implant system and the trueness of virtual techniques for measuring robot accuracy evaluated with a coordinate measuring machine in vitro","authors":"Libo Zhou, Weiwei Teng, Xinru Li, Yucheng Su","doi":"10.1016/j.prosdent.2023.11.004","DOIUrl":"https://doi.org/10.1016/j.prosdent.2023.11.004","url":null,"abstract":"<h3>Statement of problem</h3><p>A unified standard for measuring robot implantation errors has not yet been established. A coordinate measuring machine (CMM) measures the coordinates of an object with high accuracy. However, evaluations of the accuracy of a robotic computer-assisted implant system (R-CAIS) using CMM are lacking.</p><h3>Purpose</h3><p>The purpose of this in vitro study was to evaluate the accuracy of an optics-based R-CAIS using a CMM and to assess the accuracy of cone beam computed tomography<span> (CBCT), a laboratory scanner (LS), and an intraoral scanner (IOS) in measuring the accuracy of the R-CAIS.</span></p><h3>Material and methods</h3><p><span>Two 60×50×40-mm cubic models were prepared for the experiment. One master model and several replica models were used for the first part. Employing a robotic system software, virtual planning was performed on the digital imaging and communications in medicine (DICOM) image of the master model, and spatial mapping was performed by using an optical tracking marker (OT-marker) to ensure that virtual planning of the master model could be executed when replica casts were drilled and placed the implants. The actual placements of the implants in the replica casts were measured by using CMM. The errors between the actual and virtual-planned positions were calculated. In the second part, virtual planning was performed on the experimental model, and an optics-based R-CAIS was used to drill holes and place the implants. The actual positions of the implants were measured by using CMM, CBCT, LS, and IOS. The errors between the actual and virtual-planned positions were calculated, and the error results among groups were compared by 1-way analysis of variance or a nonparametric test. The Dunnett test was used for </span>post hoc comparison (α=.05).</p><h3>Results</h3><p>In the first part, the entry, apical, and angle deviations were 0.33 ±0.10 mm, 0.41 ±0.11 mm, and 0.33 ±0.13 degrees, respectively. In the second part, as compared with CMM, no statistically significant differences were observed in the LS group (<em>P</em>&gt;.05), whereas significant differences were observed in entry-depth, entry, apical-depth, apical, and angle deviations in the IOS group, as well as in entry-depth and apical-depth deviations in the CBCT group (all <em>P</em>&lt;.05).</p><h3>Conclusions</h3><p>The optical-based R-CAIS exhibited high accuracy. The application of CBCT for clinical implantation may be close to that of the true deviation.</p>","PeriodicalId":501672,"journal":{"name":"The Journal of Prosthetic Dentistry","volume":"4614 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Autogenous bone block osteotomy in the chin using a robotic system: A clinical report","authors":"Lin Zhou, Jiamin Ding, Yanjun Xiao, Yitian Liu, Jiang Chen, Dong Wu","doi":"10.1016/j.prosdent.2023.10.036","DOIUrl":"https://doi.org/10.1016/j.prosdent.2023.10.036","url":null,"abstract":"<p>An autogenous bone block osteotomy<span> in the chin assisted by a robotic system is described. The size of the required bone graft was designed in the robotic system before surgery, and a precise bone block osteotomy was achieved with the assistance of the robotic system in a visualized, safe, and accurate surgical approach.</span></p>","PeriodicalId":501672,"journal":{"name":"The Journal of Prosthetic Dentistry","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interdisciplinary treatment for an adolescent with fusion of the left maxillary lateral and central incisors: A clinical report","authors":"Larry Michael Over, Steven J. Sadowsky, Shawn LeMert, Michael Dryden","doi":"10.1016/j.prosdent.2023.11.013","DOIUrl":"https://doi.org/10.1016/j.prosdent.2023.11.013","url":null,"abstract":"<p><span>The interdisciplinary treatment provided for a 12-year-old boy with fusion of his left central and lateral incisors and concomitant distal space loss is described. His treatment was initiated with </span>orthodontic<span><span><span> therapy followed by endodontic treatment of the </span>fused tooth. A conservative </span>zirconia<span> and porcelain cantilevered bonded fixed dental prosthesis<span> was then completed to replace his left lateral incisor.</span></span></span></p>","PeriodicalId":501672,"journal":{"name":"The Journal of Prosthetic Dentistry","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A digital technique for cloning the emergence profile of the interim to the definitive implant-supported restoration","authors":"Yolanda Natali Raico Gallardo, Jorge Noriega, Isabela Rodrigues-Olivio, Newton Sesma","doi":"10.1016/j.prosdent.2023.10.035","DOIUrl":"https://doi.org/10.1016/j.prosdent.2023.10.035","url":null,"abstract":"<p>The subgingival contour of implant-supported restorations is key to ensuring the long-term health of the peri-implant bone and soft tissues. This report describes a step-by-step technique used to accurately clone the emergence profile of the interim crown for the definitive implant-supported restoration.</p>","PeriodicalId":501672,"journal":{"name":"The Journal of Prosthetic Dentistry","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of intraoral scanning duration on data accuracy","authors":"Cunliang Zhang, Xin Zhan, Fanghuan Wang, Ying Wu, Yingjie Yi, Jiali Meng, Guofeng Wu","doi":"10.1016/j.prosdent.2023.10.022","DOIUrl":"https://doi.org/10.1016/j.prosdent.2023.10.022","url":null,"abstract":"<h3>Statement of problem</h3><p>The use of intraoral scanners (IOSs) correlates with clinical outcome and patient satisfaction. While the accuracy of IOSs has been well evaluated, studies on the effect of scanning duration on data accuracy are limited.</p><h3>Purpose</h3><p>The purpose of this in vitro study was to investigate the relationship between different scanning durations and the accuracy of the scanned data.</p><h3>Material and methods</h3><p>Two experienced operators used the same intraoral scanner (TRIOS 3; 3Shape A/S) to scan a gypsum cast, but with 5 different scanning durations (30 seconds, 60 seconds, 90 seconds, 120 seconds, and 180 seconds), and the trueness of the scanned data was assessed. Ten scans for each duration group were performed, and all the acquired data were evaluated for precision analysis. In addition, each scanned complete arch cast was divided into anterior and posterior regions at the canine teeth, and the 3-way ANOVA test was used to assess the scanning trueness and precision of the scanned anterior and posterior dental arch.</p><h3>Results</h3><p>The intraoral scanning results between the 2 operators were highly consistent. The data of the 30-second group showed the lowest trueness and precision (<em>P</em>&lt;.001), whereas no significant difference was found among the other groups (<em>P</em>&gt;.05). The trueness and precision of the scanning data in the posterior region was inferior to that in the anterior region (<em>P</em>&lt;.001).</p><h3>Conclusions</h3><p>The duration time of the intraoral scanning (ranging from 60 seconds to 180 seconds) did not influence the accuracy of the acquired data, while excessively rapid scanning adversely affected accuracy.</p>","PeriodicalId":501672,"journal":{"name":"The Journal of Prosthetic Dentistry","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138580674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prediction of primary stability via the force feedback of an autonomous dental implant robot","authors":"Danying Chen, Jinou Chen, Xiayi Wu, Zhuofan Chen, Quan Liu","doi":"10.1016/j.prosdent.2023.11.008","DOIUrl":"https://doi.org/10.1016/j.prosdent.2023.11.008","url":null,"abstract":"<h3>Statement of problem</h3><p><span><span>While the high osteotomy and </span>implant placement accuracy via robotic implant surgery has been verified, whether the force feedback in the osteotomy process can be used to determine appropriate </span>primary implant stability remains unknown.</p><h3>Purpose</h3><p>The purpose of this in vitro study was to explore the relationship between the force feedback and the primary stability of implants placed by using an autonomous dental implant robot.</p><h3>Material and methods</h3><p><span>Five groups (n=7) of wooden and polyurethane foam<span> blocks were used to execute an implant surgery by using an autonomous implant robot. Tapered bone-level titanium dental implant replicas were placed in the blocks. The Young modulus, the maximal vertical and lateral drilling resistances, the position accuracy, and the insertion torque of implants were recorded. Simple </span></span>linear regression<span>, principal component analysis, and multiple linear regression were used. The osteotomy strategy for the implant site was adjusted according to the maximal vertical resistance of the pilot drill to achieve appropriate insertion torque. The correlation, Gompertz growth curve fitting of the insertion torque, and Young modulus were determined. The effect of the drilling resistances on the insertion torque was analyzed using 2-way ANOVA, simple linear regression, and the principal component analysis.</span></p><h3>Results</h3><p>The vertical resistance of the Ø2.2-mm pilot drill, the Ø3.5-mm twist drill, and the Ø4.1-mm profile drill had a strong simple linear correlation with the insertion torque of the implants, and the lateral resistance had a moderate linear correlation with the insertion torque. The contributions of these 6 variables to the implant torque, among which the vertical resistance of the twist drill and the pilot drill ranked first and second, were comparable. Adjustments to the strategy of site preparation according to the vertical resistance of the pilot drill achieved appropriate insertion torque (<em>P</em>&lt;.001).</p><h3>Conclusions</h3><p>The force feedback of the autonomous dental implant robot was significantly correlated with the insertion torque of implants, which may fit an interpretable mathematical model, allowing dental implants to be placed with predictable primary stability.</p>","PeriodicalId":501672,"journal":{"name":"The Journal of Prosthetic Dentistry","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138580785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of 3D digital smile design based on virtual articulation analysis in esthetic dentistry: A technique","authors":"Zhaoguo Yue, Zhiqiang Luo, Jianxia Hou, Haidong Zhang","doi":"10.1016/j.prosdent.2023.11.014","DOIUrl":"https://doi.org/10.1016/j.prosdent.2023.11.014","url":null,"abstract":"<p>A technique for the application of a virtual articulation system in 3-dimensional digital smile design (DSD) during esthetic restoration is described. To acquire stable occlusion and a smooth jaw movement pattern without premature contacts or interference, a digital facebow and a virtual articulator were used to collect and analyze a patient’s occlusal data and jaw movement information. The original pattern of occlusal contacts and jaw movements were diagnosed as stable and copied to the digital design of the new prostheses. Preparation of the abutments, crown lengthening surgery, and definitive crown fabrication and cementation were performed according to the design. After 9 months, the occlusion remained stable, and the patient was satisfied with the outcome.</p>","PeriodicalId":501672,"journal":{"name":"The Journal of Prosthetic Dentistry","volume":"147 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138580676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}