Comparison of vertical marginal gap and internal fit of chairside laminate veneers fabricated from advanced versus conventional lithium disilicate ceramics: An in vitro study.

Abstract

Statement of problem: Conventional lithium disilicate material is frequently the material of choice whenever laminate veneers are advocated. Advanced lithium disilicate (CEREC Tessera) has been introduced and is thought to be a favorable alternative to conventional lithium disilicates in terms of reduced chairside time. However, its reliability as a material for laminate veneer fabrication has not been adequately assessed.

Purpose: The purpose of this in vitro study was to assess the vertical marginal gap and internal fit of laminate veneers fabricated from the advanced lithium disilicate ceramic versus the conventional lithium disilicate ceramic.

Material and methods: A total of 22 laminate veneers were fabricated for a maxillary central incisor and divided into 2 groups; Group E (e.max CAD): fabricated from conventional lithium disilicate and Group T (Tessera):fabricated from advanced lithium disilicate. A typodont maxillary right central incisor was prepared by following the recommended parameters, and the laminate veneers were then scanned, designed, and milled. Quantitative measurements of the vertical marginal gap and internal fit of the laminate veneers on the typodont tooth were made by direct viewing and the silicone replica approach, respectively, using a digital microscope. The Student t test was performed for statistical analysis of the results (α=.05).

Results: The mean values of both groups varied significantly. Group T had a lower mean vertical marginal gap (40.5 µm) than group E (52.6 µm) (P<.05). In terms of internal fit, group T had a higher value (191.5 µm) than group E (142.4 µm) (P<.05).

Conclusions: Advanced lithium disilicate laminate veneers revealed better vertical marginal gap and lower internal fit than conventional lithium disilicate laminate veneers.