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本文的研究目的是探讨SN平面作为头影测量基准平面的可靠性,以及用两种确定SN平面的方法进行比较,检查SN平面的定位误差对与其有关的角度和线距值的影响。材料和方法:测量16名3年内用Acti-vator(活动)矫正器矫治成功的患者,其治疗前后头颅侧位片。方法为:①基于标志点的方法(L法),即SN平面治疗前后均由N点和S点的解剖标志点确定;②基于颅骨结构的方法(S法),即SN平面治疗前采用L法确定,而治疗后则由重叠前颅底某些稳定的颅骨结构后来确定,这些结构为:蝶鞍前壁、筛状板、筛骨下部之小梁结构,眶顶中线,颅中窝前壁及翼腭凹前界。测量工作由两个经验不同(指正畸头影图的描绘)的人分别进行一次。
The purpose of this study is to investigate the reliability of the SN plane as a cephalometric reference plane and to compare two methods of determining the SN plane to examine the effect of the positioning errors of the SN plane on the angles and line-spacing values associated with them. MATERIALS AND METHODS: Sixteen patients who had been successfully treated with an Acti-vator (active) appliance within 3 years were measured on the cephalometric disc before and after treatment. Methods: ① Marker-based method (L method), that is, SN plane before and after treatment by the N points and S points anatomical landmark points; ② based on skull structure method (S method), that is, SN plane before treatment with L Method to determine, and after treatment by overlapping the anterior skull base of some stable skull structure later identified these structures: the anterior wall of the sella, lamina cribrosa, undersea trabecular bone structure, the middle of the orbital roof, middle cranial fossa Wall and wing palate concave frontier. The measurement was performed separately by two persons with different experiences (depiction of orthodontics).