MARGINAL ACCURACY OF MACHINABLE ULTRA TRANSLUCENT ZIRCONIA, RESIN COMPOSITE, AND LITHIUM DISILICATE LAMINATE VENEERS FABRICATED FROM TWO ACQUISITION TECHNIQUES

Document Type : Original Article

Authors

1 Department of Fixed Prosthodontics, Faculty of Dentistry, Ahram Canadian University

2 Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University

Abstract

Abstract
Aim: to investigate the marginal accuracy of laminate veneers fabricated from machinable ultra-translucent zirconia and resin composite in comparison to lithium disilicate using two different acquisition techniques.
Materials and methods: A typodont’s upper right central incisor was prepared with a laminate veneer butt-joint preparation design. 36 laminate veneers were fabricated and divided into 3 groups: (L): Lithium disilicate (IPS e.max CAD), (Z): Ultra-translucent zirconia (Katana UTML), and (C): Resin composite (Brilliant..Crios). The groups were further divided into 2 subgroups based on scanning techniques: (D): directly scan the typodont utilizing intra-oral scanner (Medit i500) as well as (I): Indirectly scan the cast utilizing a laboratory scanner (in-Eos X5). Exocad software and the 5-axis milling machine were utilized to fabricate the veneers. The marginal accuracy was measured using a stereomicroscope.
Results: A comparison of marginal accuracy for various materials in each scanning group revealed that ultra-translucent zirconia had significantly higher marginal adaptation values than other materials for either the extra-oral or intraoral scanning groups, while, no significant difference was found between lithium disilicate and resin composite. No significant difference was observed between the extra-oral and intraoral scanning for each material when comparing the two scanning methods among all the materials.
Conclusion: Ultra-translucent zirconia showed the best marginal accuracy among other groups. No difference in marginal accuracy between lithium disilicate and resin composite. Additionally, Variations in scanning techniques used for the fabrication of different materials showed an insignificant effect regarding the marginal fit.

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Egyptian Dental Journal
Volume 71, Issue 2 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
April 2025
Pages 1625-1635

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