Bond strength between resin cement and glazed zirconia: influence of glaze etching protocol

• Grant number: 13/00177-8
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: August 01, 2013
• End date: July 31, 2014
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Marco Antonio Bottino
• Grantee: Mariana Massaroti Mele
• Host Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil

Abstract

Techniques to increase the adhesion between resin cement and zirconia have been promising. A glaze layer is applied on the ceramic surface, which allows the adhesive steps, with etching and applying the silane coupling agent. However, no studies have evaluated the protocol of hydrofluoric acid treatment that must be employed in this thin cover glaze. Therefore, the objective of this study is to evaluate the bond strength between resin cement and glazed zirconia after different etching protocols with hydrofluoric acid (HF). Also, evaluate the surface roughness of the specimens after conditioning protocols. Material and method. Blocks are made of zirconia (8 x 8 x 3 mm), which will be glazed and embedded in acrylic resin chemically activated (N = 60). Will be constructed cylinders resin cement (Ø = 3 mm, h = 3 mm) over the blocks after the different conditioning protocols glaze: Gr1 - 5% HF, 20 seconds; Gr2 - 5% HF, 60 seconds; Gr3-HF 5%, 90 seconds; GR4 - HF 10%, 20 seconds; GR5 - 10% HF, 60 seconds; GR6 - HF 10%, 90 seconds. The surface roughness is measured after different treatments and complementary analyzes are performed by using scanning electron microscope (SEM). The data of bond strength (MPa) obtained will be analyzed statistically.