Avaliação da resistência de união proporcionada por diferentes tipos de cimentos resinosos em pilares híbridos de zircônia

Abstract

Objective: The purpose of this study was to evaluate in vitro by means of tensile test, the bond strength of the constituents of zirconia abutments of two pieces in unit restorations on implants with prosthetic connections cone morse type, comparing three different types of cements resinous. Materials and Methods: Thirty zirconia pieces with the mandibular first molar format were divided into three groups according to the cement to be used to cement them on metal titanium bases: Group A- Relyx U200, Group B- Panavia F 2.0 and Group C- Multilink. Subsequently the process of cementing, the 30 specimens were stored in distilled water for 24 hours at room temperature and then were submited to thermal cycling in specific equipment undergoing baths in 5°C and 55°C, with 30 seconds remaining in each bath, 2 seconds travel time, totaling 6.000 cycles. The mechanical cycling tests were performed with the samples immersed in distilled water at 37°C, with 100N load, frequency of 2Hz and 200.000 cycles. After the thermomechanical tests, the specimens were subjected to tensile tests in a universal testing machine EMIC DL 2000. The bond strength values were supplied by the computer of the testing machine, and obtained in kilogram force (Kgf) individually for each specimen. The data obtained hair tensile test were submitted when ANOVA test, with significance level of 5 %. Previous conducting this test, the were data are checked for normality and homocedasticity those testicles - Wilk Shapiro and Bartlett, respectivamente. By means of hum stereomicroscope has been found that the adhesive cementation failure mode to type, resin cement and surface zirconia occurred in all the evidence of bodies. It is concluded that the three types of resin cements tested in this study behaved way efficient cementation of two parts of hybrid pillars of zirconia.