Efeito do tipo de pino de fibra de vidro na resistência de união em raízes alargadas e não alargadas

Abstract

The prefabricated posts made of fiber material are indicated for a rehabilitation of endodontically treated teeth with little dental remnant, and the use of posts that guarantee an adaptation to the conduit is a suitable trend. The aim of this study was to evaluate different and compare the bond strength of types of pins in different types of conduit. For this study, 40 bovine teeth of similar anatomical size and shape were used. The properties were offered in four groups (n=10 each). Two types of post (Exacto and Splendor) were used in two types of conduit (enlarged and non-enlarged roots). Root canals were instrumented to their full length using nº2 and 3 Gates-Glidden drills (Dentsply Maillefer, Ballaigues, Switzerland) and in the cervical and middle third a Gates Glidden drill number 4 (Dentsply Malleifer) was also used. For each group, a specific drill was used for each pin system used. For cementation, all samples were cemented with self-adhesive dual resin cement and application was performed using automix tips and endo tips. All roots were sectioned in the coronal and middle thirds with a thickness of 1 mm. The push-out bond strength test (PBS) was performed in a universal testing machine (EMIC). Resistance values were recorded and data were analyzed by repeated measures ANOVA and Tukey's test. Results: The bond strength of the samples showed a statistical difference between the groups only in the cervical third, and the exact group in non-widened conduit showed lower bond strength values compared to the other groups. Between cervical, middle and apical thirds no significant difference (P=0.153) was found. Conclusion: The groups using posts with fiberglass gloves had similar results to conventional fiberglass posts relined with resin, which may be associated with amounts of reinforcing material mainly in the cervical region. While in relation to the middle and apical thirds, the materials and substrates used had no significant effect on the bond strength.