COLOR MATCHING AND SHEAR BOND STRENGTH OF CAD/CAM ZIRCONIA REINFORCED LITHIUM SILICATE COMPARED TO LITHIUM DISILICATE CERAMICS (IN VITRO STUDY)

Document Type : Original Article

Authors

1 Fixed Prosthodontics, Dentistry, Alexandria, Alexandria

2 conservative Department,Faculty of Dentistry , Alexandria ,Egypt

3 Dental Biomaterials Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt

4 Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.

Abstract

Introduction: Vita Suprinity had improved mechanical properties, but color matching and bonding properties are to be investigated.
Objectives: testing color matching and shear bond strength of Suprinity versus E-max CAD.
Materials and Methods: Total sample size was 60 specimens (n=60). Color matching test (n= 40) discs were divided to Group 1 (n=20) contained E-max discs and Group 2 contained Suprinity discs (n=20) which were subdivided to two subgroups (n=10), subgroups A contained discs sized 10mm in diameter and 0.5mm thickness and subgroups B contained discs sized 10mm by 1mm. Composite discs were prepared sized 10mm by 2mm as background material and their L*a*b* values were recorded for verification. The ceramic discs were cemented to the composite discs and L*a*b* were recorded and ΔE calculated. Shear bond strength test (n=20) discs divided into two groups (n=10). Group 3 contained E-max discs sized 5mm by 3mm. Group 4 composed of Suprinity discs with the same dimensions which were cemented to dentinal surface of premolars with the occlusal surface ground off under static load of 2kg and subjected to 2000 thermocycles followed by shear bond testing using a universal testing machine.
Results: Regarding color matching mean ΔE values for E-max were non-perceivable, while for Suprinity were perceivable but acceptable, both materials showed higher values at 1mm thickness. No significant statistical difference was found regarding shear bond strength.
Conclusion: E-max showed better color matching than Suprinity which is considered as perceivable but acceptable, with no statistically significant difference regarding shear bond strength.

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Alexandria Dental Journal
Volume 49, Issue 3
B (Endodontics, Prosthodontics, Fixed prosthodontics, Conservative dentistry, Dental Biomaterials)
December 2024
Pages 135-141

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