论文部分内容阅读
目的：研究成人安氏Ⅰ类双颌前突患者上颌切牙区牙槽骨体积，为正畸诊断及治疗计划制定提供参考。方法选择安氏Ⅰ类双颌前突患者22例（双颌前突组）及个别正常牙合志愿者18例（对照组），分别拍摄头颅侧位片及锥体束计算机断层扫描（CBCT），利用 Mimics 16．0测量上颌4颗切牙牙槽骨体积。结果双颌前突组上颌切牙区牙槽骨体积除中切牙唇侧根尖区、侧切牙唇侧根尖区及腭侧牙槽嵴顶区外，其他均较对照组小（P ＜0．05）。此外，双颌前突组中切牙牙槽嵴顶区、根中区、腭侧牙槽骨区、牙槽骨总体积，侧切牙唇侧牙槽骨区、腭侧牙槽骨区、牙槽骨总体积及上颌4颗切牙牙槽骨体积之和均较对照组减少（P ＜0．001）。结论成人安氏Ⅰ类双颌前突患者上颌切牙区牙槽骨量较少，在制定矫治计划尤其是切牙压低内收过程中应更加谨慎。“,”Objective To investigate the alveolar bone volume around upper incisors in adult patients with Class Ⅰbimaxillary protrusion and provide a reference for orthodontic diagnosis and treatment planning.Methods Twenty-two cases with Class Ⅰ bimaxillary protrusion (bimaxillary protrusion group)and Eighteen cases with individual normal occlusion (control group)were recruited.Lateral cephalograms and cone beam computed tomography(CBCT)scan-nings were taken respectively and the alveolar bone volume around four upper incisors in each subject were measured by Mimics 16.0.Results In bimaxillary protrusion group,alveolar bone volume around upper incisors decreased com-pared to the control group (P <0.05),apart from labial root apex zone of central incisors,labial root apex and palatal crest zone of the lateral incisors.Besides,alveolar crest zone,middle root zone,palatal alveolar bone,total alveolar bone of the central incisors,labial alveolar bone,palatal alveolar bone,total alveolar bone of the lateral incisors and total alveolar bone volume of four upper incisors in bimaxillary protrusion group were decreased compared to the control group (P <0.001).Conclusion The alveolar bone volume around upper incisors in adult patients with Class Ⅰ bima-xillary protrusion is fewer than that in the subjects with normal occlusion.It should be more cautious in the process of treatment planning,especially retraction or intrusion of the upper incisors.