| Objective The aim of this study was to investigate the position of the distobuccal root canal orifice of maxillary second molars in a Chinese population using cone-beam computed tomography (CBCT).Methods In total,816maxillary second molars from408individuals were collected from a Chinese population and scanned using CBCT. Information related to a distobuccal root canal orifice with3or4root canals was recorded and analyzed. This information included:(1) the distance between the mesiobuccal and the distobuccal root canal orifice (DM),(2) the distance between the palatal and distobuccal root canal orifice (DP) and (3) the angle formed by the mesiobuccal, distobuccal and palatal root canal orifices (∠PDM). Results In total,763(93.51%) of816maxillary second molars had three or four root canals. The distance between the mesiobuccal orifice and the distobuccal orifice was1.0to5.0mm. The majority (81.66%) of763teeth were distributed within1.5-3.0mm. The distance between the palatal orifice and distobuccal orifice ranged from0.83mm to6.7mm;606(79.42%) were distributed within3.0-5.0mm. The angle (∠PDM) ranged from69.4°to174.7°; in708samples (92.80%), the angle ranged from90°to140°. Conclusion The position of the distobuccal root canal orifice of maxillary second molars in a Chinese population was complicated and changeable. CBCT scanning is an effective method for studying the root canal configuration. This study may help clinicians look for and locate the distobuccal orifice in root canal treatment. |
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