Dorfman H S
Am J Orthod. 1978 Sep;74(3):286-97. doi: 10.1016/0002-9416(78)90204-x.
This study involved a cephalometric analysis of 1,150 fully treated orthodontic cases evaluated by Kodachrome slides, plaster casts, and cephalometric films to determine changes in the width of keratinized gingiva relative to lower incisor tooth movement and to ascertain the incidence of mucogingival problems in orthodontic patients. It was apparent that in a small percentage of cases visible mucogingival changes occurred and could be statistically correlated with the magnitude and direction of tooth movement. In this group of patients 1.3 percent (sixteen) showed a decrease in the width of keratinized gingiva with either minimal movement or some labial movement of the mandibular incisors; 0.69 percent (eight) had an increase in keratinized gingival width concomitant with significant lingual positioning of the lower incisors. The salient point to be made is that with an initial minimal or inadequate width of keratinized gingiva (0 to 2 mm.), mandibular incisor tooth movement over a period of treatment could significantly affect the final quality of gingival health in the critical mandibular anterior region.
本研究对1150例已完成正畸治疗的病例进行了头影测量分析，通过柯达彩色幻灯片、石膏模型和头影测量片来确定角化龈宽度相对于下切牙移动的变化，并确定正畸患者中黏膜牙龈问题的发生率。显然，在一小部分病例中出现了可见的黏膜牙龈变化，并且在统计学上可以与牙齿移动的幅度和方向相关联。在这组患者中，1.3%（16例）表现为角化龈宽度减小，下颌切牙仅有轻微移动或有一些唇向移动；0.69%（8例）的角化龈宽度增加，同时下切牙明显舌向定位。需要指出的要点是，在初始角化龈宽度最小或不足（0至2毫米）的情况下，在治疗过程中下切牙的移动可能会显著影响下颌前部关键区域牙龈健康的最终质量。
