Arat Z Mirzen, Rübendüz Meliha, Akgül Ayça Arman
Department of Orthodontics, School of Dentistry, Ankara University, Ankara, Turkey.
Angle Orthod. 2003 Aug;73(4):374-80. doi: 10.1043/0003-3219(2003)073<0374:TDOCRL>2.0.CO;2.
In this study, the amount and direction of displacement of reference landmarks located on the cranial base and face were examined and compared according to the superimposition methods of Björk (method A), Steiner (method B), and Ricketts (method C). The material consisted of cephalometric and hand-wrist films of 40 nontreated growing individuals obtained at the beginning (T1) and at the end of the observation period (T2). Hand-wrist films were used to evaluate the skeletal maturation of the subjects. The displacement of each landmark was measured according to each superimposition method, and the amounts of displacement in each method were evaluated by paired t-test. The repeated measurement analysis of variance test was used to compare the variances of the changes among the methods. Significant changes were observed in landmarks (sella, nasion, basion, pterygomaxillare), which used as references for superimpositions. The direction of displacement of sella and pterygomaxillare points was different among the methods. In the horizontal plane, although most landmarks were displaced in a similar manner in the Björk and Ricketts methods, the vertical displacement of all the landmarks was different. The horizontal displacements of basion, condylion, and gonion were similar according to all three methods. These results indicate that differences regarding the superimposition methods should be taken into consideration in the evaluation of the changes due to growth or treatment.
在本研究中，根据比约克（方法A）、施泰纳（方法B）和里基茨（方法C）的叠加方法，对位于颅底和面部的参考标志点的位移量和方向进行了检查和比较。材料包括40名未经治疗的生长个体在观察期开始时（T1）和结束时（T2）获得的头影测量片和手腕片。手腕片用于评估受试者的骨骼成熟度。根据每种叠加方法测量每个标志点的位移，并通过配对t检验评估每种方法中的位移量。采用重复测量方差分析来比较各方法间变化的方差。在用作叠加参考的标志点（蝶鞍、鼻根点、颅底点、翼上颌裂点）中观察到了显著变化。蝶鞍点和翼上颌裂点的位移方向在各方法间有所不同。在水平面内，虽然比约克法和里基茨法中大多数标志点的位移方式相似，但所有标志点的垂直位移不同。根据所有三种方法，颅底点、髁突点和下颌角点的水平位移相似。这些结果表明，在评估生长或治疗引起的变化时，应考虑叠加方法的差异。
