Evaluation of relationship between maxillary anterior teeth and lower lip margin, diastema and black triangle in of smile

Abstract

Introduction: The smile is an important component of eshethic. There are many factors to determine the esthetics and characteristic of a smile. Such as maxillary front teeth midline, diastema, smile black triangle and age etc. Analysis of smile is an important role in the diagnosis and treatment planning of esthetic dentistry. Aim: The purpose of this study is to determine some of the characteristics of smile in Mongolian people. Material and method: Cross-sectional study was conducted in Bayanzurkh district of Ulaanbaatar city. A total of 108 subjects /84 female, 24 male/ were divided into 5 groups by age: 13 to 19, 20 to 29, 30 to 39, 40 to 49 and over 50 years old. Frontal view of digital photographs with smile was used. Following smile characteristics evaluated labiodental relationship of the lower lip and maxillary anterior teeth, upper front teeth diastema and black triangle. Result and conclusion: maxillary anterior teeth not covered by lower lip 84.6%, upper front teeth diastema 10.19% and black triangle 32.41%. Gender and age differences were not statistically significant for labiodental relationship of the lower lip and maxillary anterior teeth and upper front teeth diastema but statistically significant age based difference was observed for black triangle.