颌骨前突畸形三维解剖测量与诊断标准的初步建立

目的　探讨并建立颌骨前突畸形三维解剖测量方法与诊断标准。 方法　通过计算机编程建立颌骨前突畸形的三维解剖测量方法；对14例志愿者二维X线头影测量与计算机辅助三维解剖测量的结果对比分析。 结果　①建立了正中矢状面上鼻根点与上齿槽座点连线（NA）、鼻根点与下齿槽座点连线（NB）与眼耳平面（FH）的α角、β角来反映上颌骨、下颌骨对于颅部位置关系；并建立正常诊断范围：α：88°~93°；β：87°~90°。②统计结果提示二维测量与三维测量对正常颌骨无显著性差异，对于异常颌骨有显著性差异。 结论　计算机辅助颌骨前突畸形的三维解剖测量方法是可行的，体现三维解剖的空间立体关系，提高诊断的准确度，为颌骨畸形诊断和治疗提供了客观依据。

Three dimensional anatomical measurement and diagnostic criteris of jaw protrusion deformity

Objective To explore and establish a three-dimensional anatomical measurement method and diagnostic criteria for the jaw protrusion deformity.Methods We established a computer-aided three-dimensional measurement of jaw protrusion deformity after comparatively analyzing the data of cephalometric piece for 14 volunteers.Results ①On the median sagittal plane,the connection between nasion and anterior alveolar seat point(NA),between nasion and inferior alveolar seat point(NB),and between eye and ear plane(FH) were firstly established.Then the angle α(between NA and FH),and the angle β(between NB and FH) were established to reflect the relationship between the maxilla and the mandible for the location of the skull.We initially established the diagnosis criteria for the angle α(88°~93°) and the angle β(87°~90°).②Statistical data showed that,there was no significant difference between two-dimensional and 3D measurement of normal human jaws,but there was significant difference between those two methods in abnormal human jaws.Conclusions The computer-assisted construction of jaw protrusion deformity and three-dimensional anatomical measurement is feasible,which reflects the relations of lines and surfaces of three-dimensional spatial relations,improves the accuracy of the diagnosis,and provides an objective basis for diagnosis and treatment of jaw deformity.