设计了一个四面体框架,框架的四个尖焊有直径0.5mm的锡球作为检测标志点,分别比较用游标卡尺和用正、侧位定位X线片重建颅颌骨三维形态方法(简称“重建方法”)、同一对X线片不同次描图以及不同次X线片所测四个标志点的间距有无差异。结果显示:用游标卡尺和“重建方法”所测标志点间距无统计学差异(P>0.05);同一对X线片不同次描图以及不同次X线片所测四个标志点的问距也无统计学差异(P>0.05)。说明“重建方法”有较好的精确性和可重复性,可以推广使用。 A tetrahedron frame was designed with four spiked solder balls 0.5mm in diameter as test mark points. The three-dimensional morphology of the cranial jaw was reconstructed by vernier calipers and posterior and posterior X-ray films respectively Method “), the same pair of X-ray films and different sub-tracing the X-ray film measured the distance between the four markers of any difference. The results showed that there was no significant difference (P> 0.05) between the mark points measured by vernier caliper and ”reconstruction method“. There was no difference between the same sub-X-ray pictures and the four marked points measured by different X-ray films Statistical difference (P> 0.05). Explain ”reconstruction method" has better accuracy and repeatability, can promote the use.