The untreated second mesiobuccal canal (MB2) of the maxillary first molar can be considered as one of the possible causes of treatment failure and occurrence of periapical lesions. This cross-sectional study evaluated the effect of undetected MB2 canals of maxillary first molars on periapical lesions.Cone beam computed tomography (CBCT) was used to evaluate 213 scans of the first maxillary molars from two radiology clinics. All scans were analyzed to check the quality of the root canal therapy relationship with the missed MB2 canal, and the occurrence of periapical lesions.Frequency distribution of periapical lesion showed that its presence in 51.41% of cases where MB2 canal was not found, and in 25% of cases where MB2 canal was present. The Multivariate logistic regression model of the effect of different factors on lesion formation revealed that the undetected MB2 canal increases 8.8 times the risk of lesion formation.An association between the presence of periapical lesion and undetected MB2 canal indicated that the lack of finding this canal significantly affected the prognosis maxillary first molar root treatment. Configuration of mesiobuccal canals did not affect the incidence of periapical lesions.
Keywords:- CBCT imaging
- maxillary first molar
- PERIAPICAL LESION
- second mesiobuccal canal (MB2)