Influência de diferentes substâncias irrigadoras do canal radicular na resistência de união de pinos de fibra de vidro anatomizados

Abstract

The aim of this study was to evaluate the effect of using different irrigating solutions on bond strength of relining on fiber post (FP). Bovine mandibular incisors were selected. All specimens had their crowns sectioned for standardization of root remaining in the final length of 17mm. After storage in distilled water under cooling, the roots were divided into 3 groups (n=10) by type of irrigating solutions used in endodontic treatment: Group I: endodontically treated teeth and irrigated with saline solution; Group II: endodontically treated teeth and irrigated with solution of Sodium Hypochlorite (NaOCl) 2.5%; Group III: endodontically treated teeth and irrigated with a solution of Chlorhexidine (CHX) 2%. The strategy of standardized endodontic working length with 16mm deep. The conduits were desobturados with heated pluggers and drills type Largo. This procedure allowed the use of FP that were anatomised with composite resin cement and cemented with dual cure resin. After endodontic treatment, the specimens were stored for seven days under humid conditions at 37°C, and sectioned at the cervical, middle and apical thirds in six parts. Then submitted to the mechanical test push-out in a universal testing machine at a crosshead speed of 0.5mm/min. Data were collected and subjected to analysis of variance (ANOVA) followed by Tukey's test with a significance level of 5% (p<0,05). Group II had a mean bond strength (13.63 ±4.51 P=0.041) higher than other groups in the cervical third. It was concluded that the type of irrigator can influence adherence FP anatomised to the root canal walls.