"Marginal fit of zirconia-reinforced lithium silicate laminate veneers with different thicknesses using two Fabrication Methods"

Abstract

T he demand for treating un-esthetic anterior teeth continues to grow. The available options to restore their esthetics include conservative treatments as bleaching, micro-abrasion and laminate veneers restorations. Nowadays, the laminate veneers become an important part of smile designing. The main advantage of using a laminate veneer is conservation of tooth structure and as much as we can go thinner as much as the tooth structure will be conserved. The clinical success of laminate veneers depends on their marginal fit to prevent exposing of the cement, staining and discoloration. So proper selection of the material that can fulfill that need is a must especially when the veneers are in ultra-thin thickness. Zirconia reinforced lithium silicate of brand name Celtra duo and Celtra press is claimed to be the material of choice in such cases. Celtra duo as claimed by the manufacturer, this may not only due to its high edge strength but also duo to no need for the post firing process that could affect the marginal adaption of the restoration. Celtra press claimed by the manufacturer combine the advantages of ZLS with pressing technique of higher strength. In our study, we have tested the marginal fit of ultra-thin laminate veneer made from Celtra duo and Celtra press at thicknesses of 0.7mm, 0.5 mm and 0.3 mm. CAD/CAM technology had been developed rapidly to as being an accurate method more than the conventional methods. They consist of three main parts: the scanner, the software and the milling unit. The milling units differ in their number of axes and that could produce restorations with different marginal fit especially when the restoration is very thin. Although a variety of new CAD/CAM materials and milling machines exist for such application but there is no enough data in the literature regarding their marginal fit to compare it to Heat pressing technique.