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微笑,作为人们传递情感的重要方式,在人际交往和相处过程中显得必不可少。迷人和谐的微笑,常给人留下美好而深刻的印象。Tjan等[1]对微笑时唇齿的美学特征作出过如下描述:显露上前牙的近乎整个牙冠长度;不显露牙龈;上前牙切牙曲线与下唇内曲线平行;上切牙切缘与下唇刚接触或轻微不接触;显露上前牙和前磨牙;中线与和谐的微笑相一
Smile, as an important way for people to pass on their emotions, is essential in the process of interpersonal communication. Charming and harmonious smile, often give a beautiful and deep impression. Tjan et al. [1] described the aesthetic characteristics of the lips during the smile as follows: the length of the anterior teeth exposed nearly the entire crown; does not reveal the gums; upper incisors and curvatures parallel to the lower lip curve; Just contact with the lower lip or slightly do not touch; reveal the anterior teeth and premolar; midline and harmonious smile phase