Evaluation of the marginal fit of finish line designs of novel CAD/CAM restoration materials

Authors : Bike ALTAN, Şevki ÇINAR, Beste Burcu UZ, Davut ÖZKAN

Pages : 116-121

Doi:10.32322/jhsm.1216516

View : 53 | Download : 13

Publication Date : 2023-01-12

Article Type : Research Paper

Abstract :Aim: The purpose of this study is to compare the marginal fit of crowns manufactured using different CAD/CAM materials on 2 different types of finish line design. Material and Method: Tooth preparations were made by creating 2 different finish lines insert ignore into journalissuearticles values(rounded shoulder, chamfer); on an acrylic mandibular second premolar model. Impressions were taken on each preparation using polyvinylsiloxane impression material, and blocks with three different compositions including lithium disilicate insert ignore into journalissuearticles values(LDS);, zirconia-reinforced lithium silicate insert ignore into journalissuearticles values(ZLS);, and monolithic zirconia insert ignore into journalissuearticles values(MZ); insert ignore into journalissuearticles values(UP.CAD, Celtra Duo, and VITA YZ HT); were produced using a CAD/CAM insert ignore into journalissuearticles values(computer-aided-design and computer-aided-manufacturing); milling device insert ignore into journalissuearticles values(VHF R5); insert ignore into journalissuearticles values(n=10);. The marginal gap values of the crown restorations were measured by the same operator using a stereomicroscope insert ignore into journalissuearticles values(LEICA DVM6);. Histogram plots and the Kolmogorov-Smirnov test were used to test the normality of the distributions of the variables. The non-normally distributed insert ignore into journalissuearticles values(nonparametric); variables were compared using the Mann-Whitney U test for two groups and the Kruskal-Wallis test for more than two groups. Results: The marginal gap values were compared between finish line designs separately for each material. Accordingly, the marginal gap values of the rounded shoulder finish line were smaller than those of the chamfer finish line in all materials. The marginal gap values were also compared among the materials separately for each finish line type. Accordingly, the marginal gap values of the VITA YZ HT insert ignore into journalissuearticles values(MZ); material were smaller than those of the Celtra Duo insert ignore into journalissuearticles values(ZLS); and UP.CAD insert ignore into journalissuearticles values(LDS); materials for both finish line designs. There was no significant difference between Celtra Duo and UP.CAD. Conclusion: The finish line design is a factor that affects marginal fit. Monolithic zirconia is more appropriate for clinical use as it shows a better marginal fit compared to LDS and ZLS.
Keywords : Finish line, glass ceramic, CAD CAM, marginal fit, monolithic zirconia

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