Resumo

BETANCOURT, P. et al. Prevalence of a second canal in the mesiobuccal root of maxillary first molars by Cone-Beam Computed Tomography. Av Odontoestomatol [online]. 2013, vol.29, n.1, pp.31-36. ISSN 2340-3152.

Introduction: The morphology of the root canal system is complex and variable. The first permanent maxillary molar has usually a second canal in the mesiobuccal root (MB2). Its location and total lack of debridement, is the leading cause of treatment failure. The objective was to determine in vivo the prevalence of MB2 canal in mesiobuccal root of maxillary first molars using Cone-beam computed tomography (CBCT). Methods: CBCT images of first maxillary molars, left and right, in both sexes, were reviewed. We excluded roots endodontically treated or with posts, rehabilitated with a fixed prosthesis, calcified canals, evidence of root resection or pericapical surgery. 32 first molars were selected. In all cases, we performed a systematic study of the mesiobuccal root through cuts in the axial plane. Results: There was a prevalence of 68.75% of MB2 canal. There were no differences by sex or laterality. The average age was 25.31 years old. Discussion: The high prevalence found MB2 canal should be considered before establishing a root canal treatment to achieve optimal results and avoid treatment failure. The CBCT is a useful tool for detection, and has high sensitivity.

Palavras-chave : First permanent maxillary molar; second canal; mesiobuccal root; Cone-beam computed tomography.

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