Resumo

HEIDEN, Karen Andressa et al. Bond strength of four root-end filling materials to bovine and human root dentin. RFO UPF [online]. 2014, vol.19, n.1, pp. 37-43. ISSN 1413-4012.

Objective: This study aimed to compare the bond strength of four endodontic cements used for the sealing of retrocavities (Portland, MTA, Super EBA™, and Sealapex ™) in bovine and human root dentin. Materials and method: Forty bovine roots and forty distal roots from mandibular molars were apicoectomized, and retrograde cavities were prepared. Roots were randomly divided into four groups, and filled with the retrofilling materials tested. After one week, all roots were transversally sectioned, and the slices were submitted to push-out test. Failure patterns were assessed by light microscopy (10×) and classified as: adhesive, cement cohesive, dentin cohesive, and mixed. Data were analyzed using Kruskal-Wallis, Mann-Whitney, and Dunn tests. Results: The highest bond strength values were obtained in bovine dentin (P < 0.05). Portland and MTA cements presented higher bond strength values than Super EBA™ and Sealapex ™. Cement cohesive failures were predominant regardless of cement and substrate. Conclusion: It may be concluded that bond strength of retrofilling materials is dependent on the type of cement used and substrate analyzed.

Palavras-chave : Endodontics.; Apicoectomy.; Dentin..