Applying Cone Beam Compuded Tomography To Study The Impacted Maxillary Canines Treated With Closed Eruption Versus Open Eruption

Objective Applying cone beam computed tomography to measurethe root length and the marginal bone and the apical alveolar bone of theimpacted maxillary canines treated with closed eruption versus openeruption, reference for the clinical treatment of impacted maxillary canine.Methods Twenty nine cases from the College of Stomatology ofChongqing Medical University with straight wire appliance orthodontictreatment of impacted maxillary canines were selected, divided into2groups, one group chose the treatment of closed eruption(CE),the othergroup was open eruption(OE).Using CBCT to analysis the changes of theroot length of the impacted maxillary canines and the opposite maxillarycanines，the marginal bone and the apical alveolar bone of the impactedmaxillary canines before and after treatment, measurement data usingSPSS16.0software paired t-test.Results1、All of the root length had become slightly shorter, but there were no significant differences on the root length of the impacted maxillary caninesand the opposite maxillary canines for CE and OE compared with theprevious(p>0.05)2、There were significant differences on the alveolar bone height of thelip and palatal side for OE compared with the previous(p<0.05),but therewere no significant differences on the alveolar bone height of the lip andpalatal side for CE compared with the previous(p>0.05).There weresignificant differences on the thickness of the lip side of the apical alveolarbone for OE compared with the previous(p<0.05),but there were nosignificant differences on the thickness of the palatal side of the apicalalveolar bone for OE compared with the previous(p>0.05), there were nosignificant differences on the thickness of the lip and palatal side of theapical alveolar bone for CE compared with the previous(p>0.05)Conclusion1、There are not obvious root resorption of the impacted maxillarycanines treated with closed eruption and open eruption.2、The loss of marginal bone and the apical alveolar bone of the CEgroup are less than OE group during the clinical treatment of the impactedmaxillary canines.