Color match of modified high translucency zirconia frameworks

Document Type : Original Article

Authors

1 Prosthodontics Department, Faculty of Dentistry Beirut Arab University, Beirut, Lebanon

2 Prosthodontics Department, Faculty of Dentistry, Beirut Arab University, Beirut , Lebanon

3 Dental Biomaterials department, Faculty of dentistry, Alexandria University, Egypt

Abstract

Purpose: improve color match of full anatomical high translucency zirconia restorations using framework modifications. Materials and methods: Full anatomical high translucency zirconia frameworks (Cercon HT) received three modifications in framework design to allow room for layering conventional porcelain material: buccal window, extended buccal window, and occlusal clearance. Conventional porcelain was manually built according to manufacturer instructions. Color match of each framework design was compared to target color (A2, Vita classic shade guide) using a dental spectrophotometer (Vita Easy shade Advance). Delta E equation was used to measure color match of each framework design. Amount of transmitted light passing through each design was used to calculate translucency coefficient. Results: all framework modifications improved color match (∆E<3.2) compared to unmodified full anatomical design (∆E=5.7), however this improvement in color match was only limited to the area of framework modifications. Translucency of modified frameworks improved by addition of veneering porcelain (67%) compared to translucency of full anatomical framework (58%). Conclusion: Color match and translucency of full anatomical high translucency zirconia restorations improved using framework modifications.

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