Efeito dos cimentos endodônticos e da limpeza do espaço para o pino na resistência de união de dentes tratados endodônticamente

Abstract

In the present study, divided into three parts, the influence of endodontic sealers and post-space treatment differents for cleaning the post-space on the post-dentin bond strength was evaluated. The first study aimed to systematically review the literature evaluating the influence of endodontic sealers on the post-dentin bond strength. A search was performed in the PubMed/MEDLINE, Lilacs, and Scopus databases without language limit or year of publication. A total of 65 studies out of 891 potentially eligible studies were selected for reading, thus 27 studies were included in the review. The meta-analysis found that there is a significant influence of the endodontic sealer on the post-dentin bond strength. Therefore, the second part of the present study aimed to systematically review the literature to evaluate the influence of the post-space treatment on the bond strength of intraradicular posts to root dentin. Just like in the first part, a search was performed in the databases mentioned above, with no limits on language or year of publication. Of 2832 potentially eligible studies, 453 were selected for reading, and 75 were included in the systematic review. In the overall meta-analysis, the post-space treatment significantly increased the bond strength of the intraradicular post to dentin. In this study, the best treatments were alcohol, NaOCl + EDTA, NaOCl + EDTA+ ultrasound, Er:YAG laser, Nd:YAG laser, and diode laser. The third part evaluated the influence of post-space cleaning treatments, using three types of endodontic sealers for root canal filling, on the bond strength of fiber posts to dentin, and cleaning the post-space. To performed the study, 240 bovine teeth were cleaned and cut in 16 mm and the endodontic treatment was carried out, filling the canals with three endodontic sealers (based on epoxy resin, based on zinc oxide and eugenol, and bioceramic cement). Afterward, the teeth were stored for 24 hours or 6 months in an oven at 37°C. After that, the preparations for the post were made and different cleaning treatments were applied (distilled water, NaOCl + EDTA, 99% alcohol, and diode laser). The specimens were cut into slices with the aid of a cutting machine and, after, submitted to the push-out test. Also, twelve teeth were endodontically treated and filled with the different endodontic sealers studied. After the post-space was prepared, the different cleanings treatments were applied and the specimens were cut along the tooth axis and analyzed under the scanning electron microscope. Thus, we verified that the NaOCl + EDTA treatment obtained higher results for post-dentin bond strength, and we observed adequate cleanliness of the post space after using this treatment.