Islam Rafiqul, Kitahara Toru, Naher Lutfun, Hara Atsushi, Nakasima Akihiko
Department of Orthodontics, Kyushu University, Fukuoka, Japan.
Angle Orthod. 2009 Mar;79(2):256-64. doi: 10.2319/030308-125.1.
To evaluate the morphological changes in the lips and to determine the degree of improvement in the smile after orthodontic treatment for Class II division 1 malocclusion.
The sample subjects were divided into two groups: a group that consisted of 20 adult female patients with Angle Class II division 1 malocclusion and a control group that consisted of 28 adult female volunteers with normal occlusion. Frontal photographs were taken before and after orthodontic treatment, and 35 landmarks were placed on each tracing made from the photograph. Thereafter, landmarks were digitized into an x- and y-coordinate system with the subnasal point as the origin. The comparisons between pretreatment and posttreatment at rest and on smiling, and the comparisons between Class II division 1 and control group were made using Student's t-test.
Both the upper and lower lips in the smile of patients in the Class II division 1 pretreatment group were positioned downward, and the upward movement of the upper lip and mouth corners was smaller in comparison with the control group. These characteristics of the Class II smile improved after orthodontic treatment, but the differences with the control group remained unchanged immediately after treatment.
The soft tissue morphology shows a relative improvement after orthodontic treatment.
评估安氏II类1分类错牙合畸形正畸治疗后唇部的形态变化，并确定微笑改善程度。
样本对象分为两组：一组为20名安氏II类1分类错牙合畸形成年女性患者，另一组为28名咬合正常的成年女性志愿者作为对照组。在正畸治疗前后拍摄正面照片，并在每张照片的描图上标记35个标志点。此后，以鼻下点为原点，将标志点数字化到x和y坐标系中。使用学生t检验对治疗前和治疗后静止及微笑时的情况进行比较，以及对安氏II类1分类组和对照组进行比较。
安氏II类1分类治疗前组患者微笑时上、下唇均向下移位，与对照组相比，上唇和口角向上移动幅度较小。正畸治疗后，安氏II类微笑的这些特征有所改善，但治疗后即刻与对照组的差异仍未改变。
正畸治疗后软组织形态有相对改善。
