Abstract
Zirconium dioxide as core ceramic material for dental crowns and bridges, possess high strength, chemical stability and superior aesthetics after veneering. Veneering ceramic is considered to be the weakest part of all-ceramic restorations. The adhesion between the core and veneering porcelain is based on the manner in which the connection occurs in metal-ceramic structures. Standard procedures for connecting zirconia to hard dental tissues and veneering materials do not achieve the required strength of bonding. The aim of the paper is to investigate different surface treatments of the zirconium dioxide ceramic core and find the best, for achieving highest adhesive bonding values to veneering porcelain. The study was primarily designed to investigate the bonding strength of the veneering porcelain to zirconia with in vitro Macro shear bond strength test. The specimens with different surface treatment of the zirconia were divided in five groups of twelve according to the treatment of zirconium surface and results showed highest bonding values for specimens treated with Rocatec system.
Highlights
The need for higher biocompatibility and better dental aesthetics led to development of all-ceramic prosthodontic systems which are increasingly applied, their clinical performances and success are not yet proofed (Aboushelib et al, 2005)
The specimens with different surface treatment of the zirconia were divided in five groups of twelve: 1. Group A are control group without treatmentspecimens were cleaned in an ultrasonic bath and porcelain was sintered in the oven according manufacturer; 2
The statistical analysis was carried out and the results showed significant differences for the shear bond strength between measured data in all tested groups of specimens at the significant level of 0,05
Summary
The need for higher biocompatibility and better dental aesthetics led to development of all-ceramic prosthodontic systems which are increasingly applied, their clinical performances and success are not yet proofed (Aboushelib et al, 2005). The stress which is formed during cooling process of the ceramic is so called “transient” stress, while the stress which occurs at the room temperature after cooling is called “residual stress”. Both stresses can be compressive or tensile, and if we know that porcelain is not tolerant to tensile stress, it should be set at lower compressive stress (Gostemeyer et al, 2010). This means that the substructure core material must be with higher contraction than porcelain during cooling process (Sui et al, 2013). Some degree of compatibility is possible due to the expansion coefficients of the two materials, porcelain firing temperature, the resistance of the core at high temperature, the release of internal stress of the core and ceramic, the thickness ratio of the two materials and the adhesive bond between them (Kelly et al, 1990)
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