Objective:To investigate the risk factors with dehiscences and fenestrations of upper lateral incisors and canines using CBCT.Methods:CBCT images of untreated patients in China Medical University Hospital of Stomatology from 2014 to 2016 were selected.Forty-four upper lateral incisors and 43 upper canines with dehiscences or fenestrations were selected as test group,and 43 upper lateral incisors and 41 upper canines without alveolar defects were selected as control group.Results:There were significant diffe...