Dolce Calogero, Schader Randolph E, McGorray Susan P, Wheeler Timothy T
Department of Orthodontics, University of Florida, Gainesville, FL, USA.
Am J Orthod Dentofacial Orthop. 2005 Aug;128(2):195-200. doi: 10.1016/j.ajodo.2004.04.028.
Cephalometric analyses have been used by orthodontists to track growth and monitor treatment effects. Most of these analyses have normative values to which patients are compared, but some "normal" patients vary quite a bit from the normative values. The centrographic analysis is a visual analysis with no angles to measure or normative values to compare. After a reference plane is developed, the relative position of variable landmarks can be seen.
We used the centroid centrographic analysis to study the effects of 1-phase and 2-phase orthodontic treatment. Phase 1 treatment consisted of bionator (n = 66), headgear/biteplane (n = 69), or observation (n = 65) until a Class I molar relationship was achieved or 2 years had elapsed. After 1 year, all subjects underwent full orthodontic treatment with fixed appliances.
Centrographic analysis showed that early treatment has effects on the mandible. However, the differences were not apparent by the end of fixed appliance treatment.
The skeletal effects of phase 1 treatment disappear by the end of fixed appliance treatment.
正畸医生一直使用头影测量分析来追踪生长发育并监测治疗效果。这些分析大多有用于与患者进行比较的正常值，但一些“正常”患者与正常值差异颇大。图形中心分析是一种无需测量角度或比较正常值的视觉分析方法。在确定一个参考平面后，可观察到可变标志点的相对位置。
我们采用质心图形中心分析来研究一期和二期正畸治疗的效果。一期治疗包括使用生物调节器（n = 66）、头帽/平面导板（n = 69）或观察（n = 65），直至达到磨牙中性关系或满2年。1年后，所有受试者均接受固定矫治器的全面正畸治疗。
图形中心分析表明，早期治疗对下颌骨有影响。然而，在固定矫治器治疗结束时，差异并不明显。
一期治疗的骨骼效应在固定矫治器治疗结束时消失。
