Bragatto Fernanda P, Chicarelli Mariliani, Kasuya Amanda Vb, Takeshita Wilton M, Iwaki-Filho Liogi, Iwaki Lilian Cv
Department of Dentistry, State University of Maringá, Maringá Paraná, Brazil.
Department of Dentistry and Oral Radiology, State University of Maringá, Maringá, Paraná, Brazil.
J Contemp Dent Pract. 2016 Sep 1;17(9):728-733. doi: 10.5005/jp-journals-10024-1920.
The golden proportion has been used in dentistry in an attempt to improve facial function and, possibly, esthetics by simplifying the diagnosis of facial and dental disharmony. The aim of this study is to analyze pre- and postoperative cephalometric tracings of lateral cephalograms of patients with class II and III deformities submitted to orthognathic surgery, and verify if the 13 dental-skeletal patterns (ratios), as defined by Ricketts, moved closer to or further away from the golden proportion.
A total of 110 lateral cephalometric radiographs, 55 obtained preoperatively and 55 postoperatively, were analyzed using Dolphin Imaging software.
Radiographs analysis demonstrated that ratios 1, 3, 4, 5, 7, 8, 9, 10, and 13 remained statistically different from the golden proportion postoperatively. Ratio 12 was the only one to move closer to the golden number, while the opposite happened with ratio 6, which moved further away after the surgery. Ratios 2 and 11 kept statistically similar to the golden proportion both pre and postoperatively.
It may be concluded that orthognathic surgery had little effect on the proportions studied, and that the golden proportion was not present in the majority of the ratios analyzed neither before nor after surgery.
Determine whether the facial patterns approach the golden ratio after surgical correction. Also determine whether the golden ratio may be a standard to guide the surgical treatment of patients with skeletal patterns of type II and III.
黄金比例已被应用于牙科领域，旨在通过简化面部与牙齿不协调的诊断来改善面部功能，或许还能提升美观度。本研究的目的是分析接受正颌手术的II类和III类牙颌面畸形患者术前和术后的头颅侧位X线片的头影测量描图，并验证由里氏定义的13种牙-骨骼模式（比例）是否更接近或远离黄金比例。
使用Dolphin Imaging软件分析了总共110张头颅侧位X线片，其中55张术前获得，55张术后获得。
X线片分析表明，术后比例1、3、4、5、7、8、9、10和13在统计学上仍与黄金比例不同。比例12是唯一更接近黄金数的，而比例6则相反，术后远离了黄金比例。比例2和11术前和术后在统计学上均与黄金比例相似。
可以得出结论，正颌手术对所研究的比例影响不大，并且在分析的大多数比例中，术前和术后均不存在黄金比例。
确定手术矫正后面部模式是否接近黄金比例。还要确定黄金比例是否可以作为指导II类和III类骨骼模式患者手术治疗的标准。
