Influence of different surface treatment and luting agents on bond strength of zirconia

• Grant number: 12/13538-6
• Support Opportunities: Regular Research Grants
• Start date: December 01, 2012
• End date: May 31, 2015
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal Investigator: Laís Regiane da Silva Concilio
• Grantee: Laís Regiane da Silva Concilio
• Host Institution: Pró-Reitoria de Pesquisa e Pós-Graduação. Universidade de Taubaté (UNITAU). Taubaté , SP, Brazil
• Associated researchers: Ana Christina Claro Neves ; Marcelo Massaroni Peçanha

Abstract

The use of ceramic materials has shown emphasis in oral rehabilitation. Among these are systems based on zirconia, which has satisfactory outcomes related to mechanical strength, biocompatibility and biofilm formation, and a favorable option for rehabilitation of posterior regions. The challenge of this material is to obtain an effective adhesion of resin cements to ceramic, requiring alternative means of ceramic surface treatment in order to ensure an adequate adhesive cementation. The present study aims to evaluate the influence of different surface treatments on the zirconia bond strength, hardness and surface roughness using different cementing agents, before and after thermal cycling, and to evaluate the fracture surface. A hundred zirconia blocks (LAVA) will be included in epoxy resin and divided into 20 groups (n = 5) according to surface treatment, cements (Panavia 2.0 and RelyX Unicem) and thermal cycling (3mil cycles). Groups associated with the phosphate resin cement (Panavia): FSCT and FS - no treatment; FJ and FJCT - Al2O3 blasting; FSS and FSSCT - silica coating/silane; FP and FPCT - primer with MDP; FSP and FSPCT silica coating/silane/primer MDP. Groups associated with self-adhesive resin cement (Rely X): AS and ASCT - no treatment; AJ and AJCT - Al2O3 blasting; ASS and ASSCT - silica coating/silane; AP and APCT - primer with MDP; ASP and ASPCT - silica coating/silane/primer with MDP. All groups with CT naming will be submitted to thermal cycling. After the surface treatment, microhardness and surface roughness tests will be performed and further with the aid of a cylindrical plastic matrix (Tygon), five cements increments will be made, according to the specified groups, and subjected to microshear tests in a universal machine. The region of the fractures will be evaluated using a optic microscope and classified as adhesive, cohesive or mixed. Qualitative analysis of scanning electron microscopy will be obtained for each group evaluated. The means are statistically evaluated, adopting the level of p <0.05 significance level. (AU)