Background:Initiallyradiography is limited in its ability to give reliable information on the number and morphology of root canals. The application of cone-beam computed tomography (CBCT) provides a non-invasive three-dimensional confirmatory diagnosis as a complement to conventional radiography. The aim of this study was to evaluate the mb2 canal in maxillary 1stand 2ndmolars in a Chinese population using CBCT scanning.Methods:A prospective study was conducted in 156 chinese population, those attending Xinjiang medical university from august 2013 to January 2014, undergone CBCT (Orthopose XG-3G, Sirona, Germany). The images comprising 312 maxillary first molars and 312 maxillary second molars were assessed by two endodontists and an oral radiologist. The total number of mb2 in the maxillary 1st molars and 2ndmolars were counted, the incidence, correlations between left and right side occurrences, different age group and between males and females were analyzed. Results:The mean age group was 28.47 years. Males were 74 in number and females were 82 in number. Total 192(61.53％) MB2 canals were detected in maxillary 1st molars and 127(40.7%) MB2 canals were seen in maxillary 2ndmolar.The correlation between left-and right-side occurrences revealed no difference either (p >0.05). The frequency distribution of the number of root canals did not differ between females and males (p >0.05).Maximum MB2 canals were present in age group between 15 and 25 years in both maxillary 1stand 2ndmolars which was statistically significant(p<0.05). Conclusions:The Cone Beam Computed Tomography (CBCT) scanner was able to identify these complex variations. This recommends that CBCT has potential as an auxiliary tool in the evaluation of maxillary molars with complex canal morphology to improve the quality of root canal therapy.
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