A study on the smile characteristics of the subjects with different types of malocclusion

VernacularTitle:不同错牙合类型人群微笑特征的研究
Author: Liming ZHANG ; Xiaoying HU ; Chunyan LIU ; Wen WANG ; Wensheng MA ; Haiyan LU
Publication Type:Journal Article
Keywords: Smile characteristics; Malocclusion; Posed smile; Quantitative evaluation index
From: Journal of Practical Stomatology 2015;(5):686-690
CountryChina
Language:Chinese
Abstract: Objective:To compare the smile characteristics of the subjects with different types of malocclusion.Methods:1 80 sub-jects with classⅠ(n =60),classⅡ(n =60)and class Ⅲ(n =60)malocclusion at the age of 1 8 to 25 years were included.The smile vidioes and posed smile images of the subjects were acquired.Smile quantitative evaluation indexes were measured and analysed.Re-sults:There were statistical differences in smile indexes and the amount of the gingival exposure in classⅡ subjects between the male and female(P <0.05).There were statistical differences in the quantitative evaluation indexes except the smile symmetry rate among the three groups(P <0.05).The buccal corridor and the gingival exposure ordered from larger to smaller:class Ⅱ >classⅠ >classⅢ,smile index of class Ⅲ was greater than that of class Ⅰ and class Ⅱ,the teeth exposure of class Ⅱ was less than that of class Ⅰand class Ⅲ.Conclusion:Malocclusion types may affect smile characteristics.