正常儿童上下颌相互关系的X线头影测量研究

目的：研究上、下颌骨生长发育过程中的内在关系及影响因素，为临床诊断错（he)畸形及制定矫治计划奠定基础。方法：计测104名正常(he)少年儿童X线头影测量侧位片，得出17项测量值，对其中表示上、下颌骨及上、下牙齿相互关系的ANB、Ao-Bo、UI-LI测量项目以及表示上、下中切牙转矩角度的UI-SN、LI-MP进行相关因素分析：计测上、下颌标志点的坐标值，进行相关性分析。结果：ANB、Ao-Bo、UI-LI、UI-SN、LI-MP之间具有高度相关性，它们的改变将影响软组织侧貌形态；上、下颌骨标志点坐标值间均具有高度相关性。结论：正常牙争个体的上、下颌骨是协调发育的。

The cephalometric study of mutual relationship between maxilla and mandible in children with normal occlusion

Objective To study the intrinsic relationship and influencing factors during growth and development of maxilla and mandible and to provide data for the clinical diagnosis and treatment planning of malocclusion. Methods The cephalograms of 104 teenagers with normal occlusion were measured and 17 indices were calculated.Correlative factor analysis was carried out among measurement items of ANB, Ao-Bo, and UI-LI, which represent the relationship of maxilla and mandible and UI-SN and LI-MP, which represent the torque angle of upper and lower central incisors,respectively.Coordinate of landmarks in maxilla and mandible were calculated and correlative factor analysis was performed. Results ANB,Ao-Bo,UI-LI,UI-SN,and LI-MP were highly correlated, and any changes of the indices could influence the soft-tissue profile.The coordinate of landmarks in maxilla and mandible were highly correlated. Conclusion The development of maxilla and mandible is coordinated in individual with normal occlusion.