Effect of software version and parameter settings on the marginal and internal adaptation of crowns fabricated with the CAD/CAM system

Abstract

Objective This study investigated the marginal and internal adaptation of individual dental crowns fabricated using a CAD/CAM system (Sirona’s BlueCam), also evaluating the effect of the software version used, and the specific parameter settings in the adaptation of crowns.Material and Methods Forty digital impressions of a master model previously prepared were acquired using an intraoral scanner and divided into four groups based on the software version and on the spacer settings used. The versions 3.8 and 4.2 of the software were used, and the spacer parameter was set at either 40 μm or 80 μm. The marginal and internal fit of the crowns were measured using the replica technique, which uses a low viscosity silicone material that simulates the thickness of the cement layer. The data were analyzed using a Friedman two-way analysis of variance (ANOVA) and paired t-tests with significance level set at p<0.05.Results The two-way ANOVA analysis showed the software version (p<0.05) and the spacer parameter (p<0.05) significantly affected the crown adaptation. The crowns designed with the version 4.2 of the software showed a better fit than those designed with the version 3.8, particularly in the axial wall and in the inner margin. The spacer parameter was more accurately represented in the version 4.2 of the software than in the version 3.8. In addition, the use of the version 4.2 of the software combined with the spacer parameter set at 80 μm showed the least variation. On the other hand, the outer margin was not affected by the variables.Conclusion Compared to the version 3.8 of the software, the version 4.2 can be recommended for the fabrication of well-fitting crown restorations, and for the appropriate regulation of the spacer parameter.

The accuracy of the CAD system using intraoral and extraoral scanners for designing of fixed dental prostheses

“…Several studies have compared the fitting of crowns fabricated with different scanners 11,12) and milling machines 13) . However, very few studies evaluating the effect of different scanning systems and CAD software on the construction of the 3D digital structure have been reported 14) . The first aim of the present study was to compare the accuracy of the digital abutments created using two different intraoral scanners, one with active triangulation and one with a confocal laser, and an extraoral scanner with active triangulation.…”

Evaluation of Marginal Accuracy and Color Stability of Lithium Disilicate Laminate Veneer Compared to Hybrid Ceramic Veneer

“…The milling bur type that used and particle size of fillers may affect restoration accuracy. Other causes such as the intrinsic properties of the CAD-CAM system, the choice of the rotary instrument in the milling machine and its speed, technique of fabrication, type of preparation design, thickness of spacer, scanning method and its accuracy, the software system and the type of restorative material (19,20) .…”

Evaluation of the Adaptation and Fracture Resistance of Three CAD–CAM Resin Ceramics: An In vitro Study

“…Various other factors may interfere with the results, such as the setting of the design software 35 for the virtual die spacer and the gap evaluation technique used. A recent study 25 showed that optical coherence tomography (OCT) can give lower values than the replica technique for the same prosthetic work.…”