The Effect of Non-Thermal Plasma Treatment on the Shear Bond Strength of Monolithic Zirconia

Abstract

Bonding of indirect ceramic restoration to tooth structure remains a matter of concern, as the bonding interfaces are increased with the indirect restorations procedure. It is important to enhance the bond strength between indirect restorative materials and luting cements, since they are the principal factors in the success of the resin-bonded restorations. The present study was designed to evaluate the effect of aging on the SBS of resin cement to monolithic zirconia restoration which is multi-layered super translucent katana zirconia using different surface treatments protocols; no treatment, sandblasting, and non-thermal plasma(NTP). Discs were cut from the ceramic material block (STML Katana Zirconia) using low speed diamond saw. Then, the discs were sintered according to the manufacturer’s recommendations. Then, the discs were divided into three groups: Group C: Received no treatment. Group A: One surface from each disc was air abraded using 50µm alumina oxide particles. Group N: One surface from each disc were subjected to non-thermal plasma surface treatment using 98% hexamethyldisloxane vapor (HMDSO)+Argon gas(Ar) for 30 mins. then, scanning electron microscopy (SEM) and energy dispersive microscopy (EDS) was carried out Natural teeth were cut mesiodistally and enamel surface of each the buccal and lingual surface were prepared and placed into acrylic resin mold, followed by application of adhesive resin cement on the ceramic disc then the discs were cemented into the natural teeth. A fixed load of (1Kg) was positioned and was light cured using LED-unit from each side to ensure optimal polymerization. Then, the specimens were stored in distilled water for 24 hours.