Journal of Nepalese Prosthodontic Society



Introduction: Facial proportion and dental proportions are matters of interest for dental professionalsto craft a beautiful smile. In facial analyses, the role of different proportions cannot be overlookedwhen planning dentofacial treatment. This study aims to determine the different facial proportions;smile index, lower smile index, nose width to outer intercommissural width, intercanine width to outerintercommissural width, nose width to intercanine width and outer intercommissural width to lowerfacial height in esthetically pleasing smile (ES) and esthetically unpleasing smile (US) groups.

Materials and methods: The frontal smiling photographs (N=152, 74 pleasing and 78 unpleasingsmile) were gathered and different linear measurements were carried out using digital ruler. The facialproportions were derived and comparisons were made amongst groups and differences were examinedin comparison to standard accepted proportion (such as Golden proportion).

Results: Average smile index of ES (5.899±1.201) was lower than that of US group (6.421±1.675).The golden proportion was not valid for smile indices in each group. Mean nose width to intercaninewidth ratio significantly differed in ES and US. The outer intercommissural width to lower facialheight was not statistically significantly different from 1:1 ratio.

Conclusion: Most facial proportions in pleasing and unpleasing smiles showed no difference. Theouter intercommissural width to lower facial height was found in 1:1 proportion current study withpossible utilization in determining vertical dimension of occlusion.

Key words: smile, smile index, golden proportion, Nepalese

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