Peck S, Peck L, Kataja M
Department of Orthodontics, Harvard School of Dental Medicine, Boston, Mass.
Angle Orthod. 1992 Summer;62(2):91-100; discussion 101-2. doi: 10.1043/0003-3219(1992)062<0091:TGSL>2.0.CO;2.
A comparative study was performed to examine the nature of the gingival smile line (GSL), a specific dentolabial configuration characterized by the exposure of maxillary anterior gingiva during a full smile. Five soft-tissue, three dental and three skeletal variables were selected, measured and reported for a GSL sample (n = 27) and a reference sample (n = 88), both consisting of North American white orthodontic patients with a median age of 14.4 years. The results indicated that the capacity to project a gingival smile was related to: anterior vertical maxillary excess and the muscular ability to raise the upper lip significantly higher than average when smiling. Other variables significantly associated with GSL were greater overjet, greater interlabial gap at rest, and greater overbite. Factors that did not appear associated with the GSL phenomenon were upper-lip length, incisor clinical crown height, mandibular plane angle, and palatal plane angle. Clinical aspects of GSL were discussed.
进行了一项比较研究，以检查牙龈微笑线（GSL）的性质，牙龈微笑线是一种特定的牙唇形态，其特征是在充分微笑时上颌前牙牙龈暴露。为一个GSL样本（n = 27）和一个对照样本（n = 88）选择、测量并报告了五个软组织变量、三个牙齿变量和三个骨骼变量，两个样本均由北美白人正畸患者组成，中位年龄为14.4岁。结果表明，展现牙龈微笑的能力与以下因素有关：上颌垂直前突以及微笑时上唇上抬能力明显高于平均水平。与牙龈微笑线显著相关的其他变量包括更大的覆盖、静止时更大的唇间隙以及更大的覆合。似乎与牙龈微笑线现象无关的因素包括上唇长度、切牙临床冠高度、下颌平面角和腭平面角。文中讨论了牙龈微笑线现象的临床相关方面。
