Abstract
Objectives: Zirconia (Y-TZP) ceramics are considered as posterior fixed partial denture (FPD) materials; however, their applications are limited due to chipping. The use of monolithic lithium disilicate (LiDi) glass ceramics in posterior FPDs can be advantageous. This in vitro study aims to compare the loads until failure of posterior Y-TZP-FPDs and LiDi-FPDs before and after aging.
Highlights
Ceramic materials have attracted increasing attention in dentistry and have emerged as an effective alternative for the fabrication of dental restorations in several applications [1]
Higher failure loads were observed for e.max ZirPress-fixed partial denture (FPD) than those for lithium disilicate (LiDi)-FPDs (p = 0.042)
Inspection of the artificially aged test specimens prior to failure load testing revealed the complete fracture of one LiDi-FPD, and cohesive chipping in the area of the palatal cusp of the pontic was noted in two other LiDi-FPDs
Summary
Ceramic materials have attracted increasing attention in dentistry and have emerged as an effective alternative for the fabrication of dental restorations in several applications [1]. Silicate ceramics are suitable for single-tooth restorations in cases with high esthetic demands owing to their excellent optical properties; these ceramics do not have the high fracture strengths of zirconium dioxide ceramics, which are about 1200 MPa [5]. The Li2O:SiO2 ratio determines the crystalline structure of these materials, thereby indicating which LiDi or lithium aluminosilicate is formed from the raw materials [7]. In LiDi ceramics, the homogeneously dispersed crystalline phase results in an increase in the mechanical strength of the material; the application of such materials could be extended for the fabrication of full-coverage restorations in the posterior region [8,9,10]. The mechanical properties of these materials limit their wide application for replacing teeth [11]
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