Oral Health and Dental Management

Abstract

Bond Strength of Fiber Posts to Intraradicular Dentin After the Use of Ultrasonically Actived Irrigants

Egídia Maria Moura de Paulo Martins Vieira, Roberta Tarkany Basting, Fabiana Mantovani Gomes França, Flávia Lucisano Botelho do Amaral, Cecilia Pedroso Turssi

Aim: This study evaluated the bond strength of fiberglass posts (PFV) to radicular dentin in cervical, middle and apical thirds, after using ultrasonically activated irrigants. Methods: One hundred and twenty lower premolars were sectioned, which were distributed into 10 groups (n=12), according to irrigant and ultrasonic treatments. The groups were 2.5% sodium hypochlorite (HS), 2% chlorhexidine digluconate (CL), 17% EDTA, saline (SF) distilled water (AD), plus or minus ultrasonic instrumentation, and posts were cemented whith RelyX ARC. Results: The bond strength was evaluated by means of the push-out test, and results were subjected to repeated measures three-way analysis of variance and Tukey test revealed that compared to EDTA 17%, CL and SF significantly reduced the bond strength of PFV, regardless of ultrasonic instrumentation and also independently from root third (p=0.015). The most prevalent failure type was adhesive between the dentin and cement for the EDTA and HS groups, followed by mixed failure for the CL and HS groups. PFV bond strength was not affected by ultrasonic instrumentation (p=0.114), nor was it different between root thirds (p=0.280). Conclusion: The PFV bond strength to root dentin was influenced by the irrigant used, where the greatest results were obtained with 17% EDTA when compared to CL and SF with or without passive ultrasonic instrumentation.