International Journal of Computerized Dentistry最新文献

{"title":"VR-haptic and phantom head dental training: Does the order matter? A comparative study from a preclinical fixed prostho-dontics course.","authors":"Szabolcs Felszeghy, Outi Huhtela, Kiia Manninen, Mandi Mäenpää, Aisha Banafa, Mikko Liukkonen, Murat Mutluay","doi":"10.3290/j.ijcd.b4451364","DOIUrl":"10.3290/j.ijcd.b4451364","url":null,"abstract":"<p><p>Learning tooth preparation techniques and the finesse required is an important part of preclinical dental education. Being able to practice surgical skills without loss of Frasaco® teeth while being provided with performance analysis data is a boon to students and educators. We investigated the combination of haptics-enhanced virtual reality (Simodont®) and conventional phantom head practice in a preclinical dental course, evaluating the students' performances and perceptions. Forty students were randomized into two groups: Group One began within a VR-haptic setting while Group Two worked with Frasaco® teeth. Halfway through the course the scenarios were switched. A crown preparation test on Frasaco® teeth was conducted at the end of the course. Students' performances and satisfaction were assessed anonymously. Analysis of the students' performances included clinical metrics (occlusal and axial reduction, convergence angle, damage to adjacent teeth). The perceived usefulness of VR-haptic and phantom head simulations was assessed. In Group One, the tooth preparation metrics were more in line with the requested parameters compared to Group Two. All students ranked VR-haptics highly regarding manual dexterity improvement. In conclusion, this study shows that by combining VR-haptics with conventional dental procedures, it is possible to improve important preparation metrics in fixed prosthodontics tooth preparation.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"0"},"PeriodicalIF":1.8,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41216675","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":"Insights on the digitalisation of dental practices: A cross-sectional pilot study in Hesse.","authors":"Maximiliane Amelie Schlenz, Nelly Schulz-Weidner, Max Olbrich, Darlene Buchmann, Bernd Wöstmann","doi":"10.3290/j.ijcd.b4494409","DOIUrl":"10.3290/j.ijcd.b4494409","url":null,"abstract":"<p><strong>Aim: </strong>Even though today, many fields in dentistry allow digital processes, analogue procedures are still widely used. This cross-sectional pilot study aimed to survey insights on the digitalisation of dental practices using the example of Hesse.</p><p><strong>Materials and methods: </strong>Between April and June 2022, 4840 active practicing dentists registered by the State Dental Association of Hesse were invited via e-mail to fill out an online questionnaire regarding their technical requirements in dental practice, dental treatment procedures, and attitude towards digitalisation in dentistry. Demographic questions were asked. Besides descriptive statistics, correlations were analyzed (P < 0.05).</p><p><strong>Result: </strong>Questionnaires of 937 dentists (279 female, 410 male, four inter/divers, 244 no answer; mean age of 51.4 ± 10.4 years) were examined representing a respond rate of 19.36%. In the area of practice administration and dental radiography, the majority of the dentists surveyed is already working digitally, which is predominantly assessed as a positive development. Already one third of the respondents state that they use an intraoral scanner for dental treatments, but the indication is mainly limited to smaller restorations. However, many dentists rate the use of social media accounts and telemedicine rather negative.</p><p><strong>Conclusion: </strong>Within the limitation of this pilot study, many processes especially in dental treatments are still analogue. However, 60% of the participants plan digitalisation of their dental practices within the next five years, which indicates a clear shift from analogue to digital dentistry.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"0"},"PeriodicalIF":1.8,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41216663","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":"Zirconia restorations and the tool diameter compensation.","authors":"Christine Yazigi,&nbsp;Reinhard Busch,&nbsp;Matthias Kern","doi":"10.3290/j.ijcd.b3836703","DOIUrl":"10.3290/j.ijcd.b3836703","url":null,"abstract":"<p><strong>Aim: </strong>The aim of the present article is to describe a new method to reduce the undesirable loss of material thickness that results from overmilling due to the tool diameter compensation correction of common CAD/CAM software.</p><p><strong>Materials and methods: </strong>Today's CAD/CAM software (eg, 3Shape or Exocad) specifies the same tool diameter compensation for different ceramics. In the case of zirconia ceramics milled in the raw state, this leads to excessive milling of the inner surfaces of crowns, which results in unnecessarily large cementation gaps and a restoration that is thinned out from the inside. By manually reducing the preset correction in the digital design process by the volumetric sintering shrinkage factor specified by the manufacturer, excessive thinning of the zirconia can be avoided.</p><p><strong>Results: </strong>The inner geometry of the restorations changes only slightly after manually reducing the preset tool diameter compensation correction. Consequently, a design of the restoration with the required minimum interocclusal thickness yet with accurate passive seating and marginal fit is possible without any further interventions.</p><p><strong>Conclusions: </strong>Understanding the specifics of the subtractive fabrication process as well as the properties of the restorative materials is a key factor in achieving optimal clinical outcomes with all-ceramic restorations fabricated with CAD/CAM technology. The use of monolithic zirconia combined with a calculated reduction in the preset tool diameter compensation correction might be beneficial in cases with thin or uneven geometry.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"257-264"},"PeriodicalIF":1.7,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10613618","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":"Comparison of load bearing capacity of ceramic crowns with zirconia or polyetherketoneketone frameworks.","authors":"Özge Seckin,&nbsp;Ceyda Akin,&nbsp;Mutlu Özcan","doi":"10.3290/j.ijcd.b3774269","DOIUrl":"10.3290/j.ijcd.b3774269","url":null,"abstract":"<p><strong>Aim: </strong>The aim of the present study was to compare the load bearing capacity of monolithic or bilayered single crowns with zirconia or polyetherketoneketone frameworks designed and fabricated using CAD/CAM systems.</p><p><strong>Materials and methods: </strong>Cr-Co-based metal dies (n = 60) were duplicated from an extracted and prepared premolar and then restored with different CAD/CAM materials. The specimens were divided into five groups (n = 12) according to the type of materials: group S: monolithic zirconia-reinforced lithium disilicate; group ZI: bilayered zirconia framework with lithium disilicate; group ZE: bilayered zirconia framework with resin-infiltrated hybrid ceramic; group PI: bilayered polyetherketoneketone (PEKK) framework with lithium disilicate; group PE: bilayered PEKK framework with resin-infiltrated hybrid ceramic. The crown specimens were cemented on Cr-Co metal dies with a resin cement (Multilink N). The specimens were subjected to cyclic mechanical loading followed by load bearing testing. Data were analyzed using the Kruskal-Wallis and Mann-Whitney U tests (α = 0.05).</p><p><strong>Results: </strong>The monolithic crowns in group S (1930 ± 452.18 N) presented significantly higher load bearing capacity than those of the other groups (P < 0.05). This was followed by group ZI (1165.41 ± 264.04 N). The remaining groups demonstrated comparable results. Failure types were more frequent in all zirconia specimens that included veneering ceramic.</p><p><strong>Conclusions: </strong>Monolithic zirconia-reinforced lithium disilicate CAD/CAM ceramics showed superior load bearing capacity compared with all other bilayered counterparts. All CAD/CAM materials tested remarkably exceeded the average occlusal force in the posterior region.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"227-236"},"PeriodicalIF":1.7,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9072262","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":"Dentistry, where are you going?","authors":"Florian Beuer","doi":"10.3290/j.ijcd.b4440063","DOIUrl":"https://doi.org/10.3290/j.ijcd.b4440063","url":null,"abstract":"","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"26 3","pages":"195-196"},"PeriodicalIF":1.7,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41166597","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":"Zirconia CAD/CAM machining vibrations related to zirconia blank shape and initial digital nesting.","authors":"Ameer Biadsee,&nbsp;Eran Dolev,&nbsp;Vladimer Perlis,&nbsp;Ofir Rosner,&nbsp;Shchada Masarwa,&nbsp;Zeev Ormianer","doi":"10.3290/j.ijcd.b3774277","DOIUrl":"10.3290/j.ijcd.b3774277","url":null,"abstract":"<p><strong>Aim: </strong>To evaluate CAD/CAM milling vibrations related to zirconia disk design, framework, and location of digital crown nesting during zirconia soft milling.</p><p><strong>Materials and methods: </strong>In the present in vitro study, 25 round zirconia disks of 98 mm (R group) and 15 D-shaped zirconia disks of 71 mm (D group) were placed in a 5-axis CAD/CAM milling unit. The R group had 3 crown milling sites (n = 75) and the D group had 2 crown milling sites (n = 30). In the R group, site A was located 57 mm, site B was 92 mm, and site C was 123 mm from the machine holder attachment. In the D group, site A was 57 mm and site C was 123 mm from the machine holder attachment. A vibration meter (VB-8200; Lutron) was connected to the disk holder, and data (mm/second) were collected during the milling process at the different nesting locations. One-way ANOVA with post-hoc tests and Bonferroni correction for multiple tests were used to compare the groups (α = 0.05).</p><p><strong>Results: </strong>In the R group, site C exhibited the highest mean vibration values compared with site A (P = 0.001). The first and second cutting tools (2.5 and 1 mm) exhibited statistically significant differences between the D and R groups at milling sites A and C (P < 0.001 and P = 0.003, respectively).</p><p><strong>Conclusions: </strong>Milling vibration increased as the distance between the machine holder arm and a digitally nested site increased. Round zirconia disks induced higher vibration values compared with D-shaped disks.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"211-216"},"PeriodicalIF":1.7,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9072261","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 and success of veneered zirconia crowns.","authors":"Elisabeth Prause,&nbsp;Jeremias Hey,&nbsp;Guido Sterzenbach,&nbsp;Florian Beuer,&nbsp;Ufuk Adali","doi":"10.3290/j.ijcd.b3796761","DOIUrl":"10.3290/j.ijcd.b3796761","url":null,"abstract":"<p><strong>Aim: </strong>The aim of the present study was to evaluate the long-term clinical survival and success rate of veneered zirconia crowns with a modified anatomical framework design after 10 years in function.</p><p><strong>Materials and methods: </strong>In total, 36 zirconia crowns were fabricated for 28 patients. An anatomically modified framework design was developed. Crowns were inserted between 2008 and 2009. A follow-up of 19 patients with 28 crowns was conducted in 2020 to document mechanical and biologic parameters. Additionally, a modified version of the pink esthetic score (PES) was documented. Patient satisfaction was assessed using United States Public Health Service (USPHS) criteria. The success and survival rates were calculated using the Kaplan-Meier analysis.</p><p><strong>Results: </strong>After more than 10 years of clinical service, the survival rate of the zirconia crowns was 92.9%. Biologic complications occurred in 12% of the examined crowns, whereas technical complications occurred in 54%. Mostly, chippings (50%) and insufficient marginal gaps (50%) were observed. Most crowns were positively evaluated for more than one technical complication. Periodontal conditions with probing depths of up to 3 mm were comparable with measured values before crown delivery (73% to 75%). Most of the crowns had modified PES values of 10 or higher. Patient satisfaction was high.</p><p><strong>Conclusions: </strong>The modified framework design led to a high survival rate of the crowns but a relatively low success rate. High patient satisfaction and inconspicuous periodontal conditions were demonstrated. Biologic complications occurred far less frequently than technical complications.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"247-255"},"PeriodicalIF":1.7,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10519103","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 core buildup composite resin translucency on intraoral scanner accuracy: an in vitro study.","authors":"Nhat Dinh-Minh Nguyen,&nbsp;Nguyen Chi Tran,&nbsp;Trang Tran,&nbsp;Nam Cong-Nhat Huynh,&nbsp;Khoa Dang Nguyen,&nbsp;Hung Hoang,&nbsp;Ding-Han Wang,&nbsp;Ming-Lun Hsu","doi":"10.3290/j.ijcd.b3774253","DOIUrl":"10.3290/j.ijcd.b3774253","url":null,"abstract":"<p><strong>Aim: </strong>The accuracy of 3D images produced by an intraoral scanner (IOS) is affected by the optical characteristics of restorative materials such as metal, ceramic, and composite resin. The present in vitro study aimed to investigate the impact of core buildup composite resin translucency on IOS accuracy.</p><p><strong>Materials and methods: </strong>A core buildup procedure was performed on a proprietary 3D-printed model using injectable composite resins in four groups with different levels of translucency (highest to lowest: AE, A3, AO3, and EX). Ten experimental scans per group were performed using a Medit i700 IOS on a phantom head-mounted model. Reference scans were obtained using an industrial scanner (Solutionix C500). Values of accuracy (trueness and precision) for the respective groups were evaluated using mean deviation values following 3D superimposition.</p><p><strong>Results: </strong>Composite resin translucency caused the scale reduction of the optical impressions. Values of trueness showed the highest scale reduction in AE, significantly, followed by A3, AO3, and EX. Considering 50 μm as the cut-off value of deviations for clinical acceptability, the analysis showed most deviations in AE and A3. Similar results were found with precision, where AE showed the highest deviation value statistically, followed by A3, AO3, and EX.</p><p><strong>Conclusions: </strong>Composite resin translucency affects the accuracy of optical impressions, causing a fitting error of CAD/CAM prostheses. The more translucent the composite resin, the less accurate the optical impression. This suggests the need for proper compensation during prosthesis designing for an optimal clinical result. In addition, practitioners should indicate in the digital workflow the proper restorative materials regarding not only the mechanical properties and esthetics, but also the optical characteristics.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"201-210"},"PeriodicalIF":1.7,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10859004","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":"Influence of DLP and SLA printer technology on the accuracy of surgical guides for implant dentistry in free-end situations.","authors":"Vinzenz Le,&nbsp;Andreas Keßler,&nbsp;Matthias Folwaczny","doi":"10.3290/j.ijcd.b3774115","DOIUrl":"10.3290/j.ijcd.b3774115","url":null,"abstract":"<p><strong>Aim: </strong>The present in vitro study aimed to compare the accuracy of the implant position inserted by surgical guides manufactured by three different 3D printers (one SLA and two DLP) and a subtractive manufacturing technique for a free-end situation.</p><p><strong>Materials and methods: </strong>Surgical guides were manufactured using three different 3D printers, one SLA printer (Form 2; Formlabs) and two DLP printers (D20 II; Rapid Shape, and SolFlex 350; W2P Engineering). Surgical guides manufactured using the conventional CAD/CAM-based subtractive method served as controls. In total, 48 surgical guides were printed and assessed for accuracy. The guides were used for the placement of implants at tooth position 37. The postoperative implant position was digitally scanned for metric comparison with the preoperatively planned implant position.</p><p><strong>Results: </strong>Significant differences were found when the SLA and DLP printers were compared. The SLA printer showed significantly lower accuracy in implant displacement at crest (P = 0.032) and angular displacement (P = 0.049) compared with the two DLP printers. The DLP printers showed comparable values to the control group. The results were within an acceptable clinical range.</p><p><strong>Conclusion: </strong>DLP technology seems to be superior to conventional SLA technology in terms of the accuracy of 3D-printed surgical guides when used for placement of implants in free-end situations.</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"217-226"},"PeriodicalIF":1.7,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10859005","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":"Strength of implant-supported lithium disilicate and polymer-infiltrated ceramic network restorations after thermomechanical aging.","authors":"Alfonso Gil,&nbsp;George Eliades,&nbsp;Mutlu Özcan,&nbsp;Ronald E Jung,&nbsp;Christoph H F Hämmerle,&nbsp;Alexis Ioannidis","doi":"10.3290/j.ijcd.b3781703","DOIUrl":"10.3290/j.ijcd.b3781703","url":null,"abstract":"<p><strong>Aim: </strong>To evaluate the fracture load and type of failure of two different monolithic restorative materials bonded to standardized titanium bases and fabricated by two different procedures regarding the bonding interface.</p><p><strong>Materials and methods: </strong>All screw-retained implant crown specimens (n = 40), subjected to fatigue by thermomechanical loading, differed in the restorative material (lithium disilicate [LDS] or polymer-infiltrated ceramic network [PICN], referred to as 'hybrid ceramic' [HYC]) and the interface type between the restorative material and the titanium base abutment (prefabricated ex-factory or produced during a CAM-milling procedure). This resulted in the following groups (n = 10/group): 1) LDS-M: lithium disilicate crown with a CAM-milled interface; 2) LDS-P: lithium disilicate crown with a prefabricated interface; 3) HYC-M: PICN crown with a CAM-milled interface; and 4) HYC-P: PICN crown with a prefabricated interface. Aged specimens underwent static fracture load testing. The load (N) at which the initial crack occurred was denoted as Finitial, and the maximal load (N) at which the restorations fractured as Fmax. All specimens were examined under a stereomicroscope to determine the failure mode.</p><p><strong>Results: </strong>The median Finitial values were 180 N for LDS-M, 343 N for LDS-P, 340 N for HYC-M, and 190 N for HYC-P. The median Fmax values were 1822 N for LDS-M, 2039 N for LDS-P, 1454 N for HYC-M, and 1581 N for HYC-P. The intergroup differences were significant for Finitial (KW: P = 0.0042) and for Fmax (KW: P = 0.0010). The failure types also showed differences between the restorative groups.</p><p><strong>Conclusions: </strong>The choice of restorative material had a stronger influence on the fracture load than the abutment interface workflow. Lithium disilicate showed the highest load for initial crack appearance (Finitial) and for complete fracture of the restoration (Fmax).</p>","PeriodicalId":48666,"journal":{"name":"International Journal of Computerized Dentistry","volume":"0 0","pages":"237-245"},"PeriodicalIF":1.7,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10519102","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}