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http://dx.doi.org/10.4047/jap.2020.12.6.344

How adjustment could affect internal and marginal adaptation of CAD/CAM crowns made with different materials  

Hasanzade, Mahya (Dental Research Center, Dentistry Research Institute, Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences)
Moharrami, Mohammad (Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences)
Alikhasi, Marzieh (Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences)
Publication Information
The Journal of Advanced Prosthodontics / v.12, no.6, 2020 , pp. 344-350 More about this Journal
Abstract
PURPOSE. Recently introduced hybrid and reinforced glass ceramic computer-aided design/computer-aided manufacturing (CAD/CAM) materials have been used for full-coverage restorations. However; the effect of adjustment and type of materials on internal and marginal adaptation are unknown. This study aimed to evaluate and compare the marginal and internal adaptations of crowns made of three different CAD/CAM materials before and after adjustment. MATERIALS AND METHODS. One acrylic resin maxillary first molar was prepared and served as the master die. Thirty-six restorations were fabricated using CAD/CAM system (CEREC Omnicam, MCXL) with three materials including lithium disilicate (IPS e.max CAD), zirconia-reinforced lithium silicate (Suprinity), and hybrid ceramic (Enamic). Internal and marginal adaptations were evaluated with the reference point matching technique before and after adjustment. The data were analyzed using mixed ANOVA considering α=.05 as the significance level. RESULTS. The effect of adjustment and its interaction with the restoration material were significant for marginal, absolute marginal, and occlusal discrepancies (P<.05). Before adjustment, Suprinity had lower marginal discrepancies than IPS e.max CAD (P=.18) and Enamic (P=.021); though no significant differences existed after adjustment. CONCLUSION. Within the limitations of this study, crowns fabricated from IPS e.max CAD and Suprinity resulted in slightly better adaptation compared with Enamic crowns before adjustment. However, marginal, axial, and occlusal discrepancies were similar among all materials after the adjustment.
Keywords
Ceramic restoration; Computer-aided design/computer-aided manufacturing (CAD/CAM); Internal fit; Marginal fit; Adjustment;
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