Abstract
Objectives: The aim of this study was to evaluate the changes in smile morphometric indices following maxillary advancement and mandibular setback surgery in patients with skeletal class III malocclusion.
 Materials and Methods: Smile morphometric indices were measured on frontal rest and smile photographs of 15 female patients with skeletal Class III malocclusions before and three months after maxillary advancement and mandibular setback surgery. Pre- and post-surgery measurements were compared.
 Results: The amount of left and right commissural height, philtrum height, and maximum upper incisor show at rest did not change significantly three months after surgery (p>0.05). The amount of maximum upper and lower incisor show, interlabial gap, smile width and index, buccal corridor ratio, gingival display, and smile arc on the frontal smile photographs didn’t showstatistically significant difference before and after surgery (P>0.05).
 Conclusion: Orthognathic surgery in patients with skeletal Class III malocclusion had no significant effect on rest and smile parameters from the frontal view.
 Bangladesh Journal of Medical Science Vol.18(2) 2019 p.216-221
Highlights
In recent decades assessing and designing the smile has become a cornerstone in orthodontic diagnosis and treatment planning.1-3Smile esthetics is of prime importance; because of its contribution to the overall attractiveness and for its role in improving self-concept and emotional well-being
Skeletal Class III malocclusions can result in dysfunction and esthetic deformities with consequent psychological problems.6To resolve these challenges, orthognathic surgical procedures are used to improve function and esthetics
These esthetic changes are usually the results of variable soft tissue response to orthognathic surgery.7-9Therefore, it is important for orthodontists to be aware of changes in orofacial soft tissue and subsequently in smile esthetics following orthognathic surgery
Summary
In recent decades assessing and designing the smile has become a cornerstone in orthodontic diagnosis and treatment planning.1-3Smile esthetics is of prime importance; because of its contribution to the overall attractiveness and for its role in improving self-concept and emotional well-being. 4 Individuals with dentofacial deformities and malocclusion usually have an unpleasant smile which potentially affects their social interactions.[5]. The following indices were measured on the frontal pose smile photographs (Figures 3,4): the maximum upper incisor show, lower incisor show, gingival display of upper central incisors, interlabial gap, the width of the smile 20, smile index
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