Authors
1 assistant professor of orthodontics. Dental faculty of Yazd shahid Sadoughi university of medical science
2 assistant professor of oral and maxillofacial pathology. Dental faculty of Yazd shahid Sadoughi university of medical science
3 Dentis
Abstract
Aim: Ideal facial esthetic and smile as one of it's components are the major topics in orthodontic treatment. One important goal in modern orthodontics is harmony between facial soft tissue in static and dynamic state. The objective of this study is evaluation of correlation between facial index and modified smile index (MSI).
Materials and methods: This study was a descriptive-cross sectional study. 130 patients who referred to orthodontic department of dental faculty of Yazd shahid sadoughi university of medical science were chosen. The facial index of subjects were determined on the basis of Farkas study as (N’-Gn’÷Zy-Zy ×100). Then photographs of their social smile from frontal view were captured and inter commissural distance (IC) and inter labial gap(ILG) were also measured and MSI was determined as [(ILG÷IC)×100]. By using SPSS software and statistical analysis (T-test and Pearson correlation) mean value of MSI and facial index was attained in men and women and The correlation rate between facial index and MSI was
also evaluated.
Results: The results of statistical analysis (T-test and Pearson correlation) showed that:
The facial index mean value was 107.68±7.15 (108.39±7.26 in men and 106.98±7.03 in women).there was no statistical difference between 2 sexes. (Pvalue: 0.265) The MSI mean value was 17.76±3.79 (17.33±3.75 in men and 18.19±3.80 in women).there was no statistical difference between two sexes.(Pvalue:0.198) There was no statistical correlation between facial index and MSI (Pvalue:0.920).
Conclusion: There are different faces and MSI but there is no correlation between facial form and smile type.
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