Resistência flexural de materiais adesivos empregados no preenchimento de raízes fragilizadas associados a pinos intra-radiculares de fibra de vidro

Abstract

This study evaluated the flexural strength of two adhesive materials employed in the filling of weake- ned root structures, associated to prefabricated glass fiber posts. Forty-four specimens were fabri- cated (n=11), and were divided into: G1 – composite resin core (Enforce Core – Dentsply); G2 – resin-modified glass ionomer cement (Vitremer-3M ESPE); G3 – composite resin core (Enforce Core) + glass fiber post (Fibrekor Post System – Jeneric Pentron); G4 – resin-modified glass ionomer ce- ment (Vitremer) + glass fiber post (Fibrekor Post System). The speci- mens were fabricated with dimen- sions of 3x3x15mm, being stored in distilled water for 24 hours at 37 ºC up to the accomplishment of the three-point bending test. The achieved data (MPa) were submitted to Anova and Tukey’s tests. Group G1 (164.21 MPa) was statistically better (p<0.001) than the others. Groups G2 (73.67 MPa) and G4 (66.90 MPa) were statistically similar to each other and worse than the others. Thus, it was concluded that the composite resin Enforce Core was better than the resin-modified glass ionomer cement Vitremer regarding flexural strength. The use of the glass fiber post reduced the flexural strength values for both studied materials. Key words: flexural strength, com- posite resin, glass ionomer cement, mechanical properties.