Resumo

BETANCOURT, P.; CANTIN, M.  e  FUENTES, R.. In vitro and in vivo frecuency of MB2 canal in maxillary first molars: a systematic review. Av Odontoestomatol [online]. 2014, vol.30, n.1, pp.11-22. ISSN 2340-3152.

Introduction: First maxillary molar (1MM) presents the greatest morphological variation in root canals and endodontic posttreatment failure rate. Among the major causes of failure is the lack of secondary mesiobuccal canal (MB2) location. The aim of this systematic review was to determine the percentage of MB2 detection in 1MM on in vivo and in vitro studies using different techniques. Methods: An electronic MEDLINE-PubMed, Web of Knowledge and SciELO search complemented by manual searching was conducted up to january 1980. Human studies evaluating the MB2 detection, in English and Spanish language, and randomized clinical trials, prospective cohort, retrospective, case series and descriptive studies, were considered for inclusion. Additionally, assessment of their methodological quality was evaluated. Results: Thirty-five articles were included. In vitro studies obtained higher detection rates with optical (100%) and endodontic microscopes (EM) (92.3%), Cone beam computed tomography (CBCT) (92%), and computed microtomography (90-80%). On in vivo studies were obtained with EM (73.2%), CBCT (70.5%) and combined methods using magnification and ultrasound (70.2%). All articles showed a 1B level of evidence. Discussion: The prevalence of MB2 canal reported in the literature varies according to detection technique and study type. Specialized techniques as ME, CBCT or ultrasound are recommended to detect the MB2 and improve success rates of 1MM endodontic treatment.

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

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