Pereira-Stabile Cecília L, Ochs Mark W, de Moraes Márcio, Moreira Roger W F
Division of Oral and Maxillofacial Surgery, Piracicaba Dental School, Campinas State University, Piracicaba, SP, Brazil.
Br J Oral Maxillofac Surg. 2012 Sep;50(6):533-6. doi: 10.1016/j.bjoms.2011.10.016. Epub 2011 Dec 10.
Our aim was to evaluate cephalometrically the preoperative inclination of the incisors in a group of 50 patients with Class III dentofacial deformities whose immediate preoperative lateral cephalometric radiographs were analysed after they had been treated by maxillary advancement. The radiographs were hand-traced by the same operator who made the cephalometric analysis. Mean values for each measurement were compared with the normal values using Student's t-test (p<0.05). Results showed significantly increased inclination of the upper incisors, with a mean U1-NA angle of 27.58° and a mean U1-PP angle of 116°. The lower incisors were also inclined lingually, with a mean L1-NB angle of 22.53° and a mean IMPA of 83.13°. Thirty-five of the patients had labial inclination of the upper, and 28 lingual inclination of the lower, incisors. Mean inclinations of upper and lower incisors differed from the normal values, and the inclination of the lower incisors was more likely to be decompensated than that of the upper incisors.
我们的目的是通过头影测量法评估一组50例III类牙颌面畸形患者术前切牙的倾斜度。这些患者接受上颌前徙治疗后，对其术前即刻的头颅侧位片进行分析。这些X线片由进行头影测量分析的同一位操作人员手工描绘。使用学生t检验（p<0.05）将每次测量的平均值与正常值进行比较。结果显示，上切牙倾斜度显著增加，U1-NA平均角度为27.58°，U1-PP平均角度为116°。下切牙也舌倾，L1-NB平均角度为22.53°，IMPA平均角度为83.13°。35例患者上切牙唇倾，28例患者下切牙舌倾。上下切牙的平均倾斜度与正常值不同，且下切牙比上切牙更易出现代偿不足。
