Williamson P C, Major P W, Nebbe B, Glover K E
Division of Orthodontics, University of Alberta, Edmonton, Canada.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1998 Sep;86(3):360-9. doi: 10.1016/s1079-2104(98)90186-x.
The purpose of this study was to examine the identification error of certain submentovertex landmarks and to compare three different methods of determining horizontal condylar angulation in submentovertex radiographs. To determine landmark identification error, a random sampling of 12 submentovertex radiographs from preorthodontic patients between the ages of 10 and 17 years was used to determine both intraexaminer and interexaminer reliability. The error associated with the identification of each of 11 landmarks varied between specific landmarks, between the same landmarks bilaterally, and between the vertical and horizontal components of the same landmark. In general, intraexaminer data showed less landmark identification error in both vertical and horizontal directions than did interexaminer data. The foramen spinosum landmarks demonstrated the lowest identification error in both horizontal and vertical direction (intraexaminer), whereas greater identification error was associated with the condylar lateral poles and posterior condylar points (both intraexaminer and interexaminer). A comparison of three different methods of condylar angulation determination was undertaken through the use of two tracings of each of 101 submentovertex radiographs. A computer-derived method representing the principal axis of minimum moment of inertia of the condyle was shown to be more reliable (p < 0.05) with respect to describing condylar angulation than both a method that used a best-fit line through the anterior condylar border and an interpolar axis method.
本研究的目的是检查某些颏顶位标志点的识别误差，并比较三种不同的确定颏顶位X线片中髁突水平角度的方法。为了确定标志点识别误差，从10至17岁的正畸治疗前患者中随机抽取12张颏顶位X线片，用于确定检查者内和检查者间的可靠性。与11个标志点中每个标志点识别相关的误差在特定标志点之间、双侧相同标志点之间以及同一标志点的垂直和水平分量之间各不相同。一般来说，检查者内数据在垂直和水平方向上显示的标志点识别误差均小于检查者间数据。棘孔标志点在水平和垂直方向上（检查者内）的识别误差最低，而髁突外侧极和髁突后点（检查者内和检查者间）的识别误差较大。通过对101张颏顶位X线片每张进行两次描图，对三种不同的髁突角度测定方法进行了比较。相对于通过髁突前缘的最佳拟合线方法和极间轴方法，一种表示髁突最小惯性矩主轴的计算机衍生方法在描述髁突角度方面被证明更可靠（p<0.05）。
