Abstract

Evaluation of Transverse Facial Proportions (Facial Symmetry) by Rule of Fifths in a Sample of Iraqi Adult Males with Normal Occlusion

Background: The rule of fifths describes the facial proportions in a transverse relation. This study aimed to evaluate the transverse facial proportions by the rule of fifths in a sample of Iraqi adult males with class I normal occlusion, and to find if there is a correlation between alar width and the distance between the inner canthus and between the mouth width and the distance between the points at the most medial margin of the iris of the eyes. Materials and methods: The sample of this study consisted of 50 Iraqi adults, dental male students of 18-25 years of age. After clinical examination of each individual, a full frontal facial photograph with a cephalostat head position was taken for each individual. Each photograph with facial landmarks and measurements was analyzed by AutoCAD 2014 program and then were subjected to statistical analysis which included the descriptive statistics of the measured variables. Results and conclusions: The statistical analysis showed that there was a non-significant difference between the medial two fifths on the right side and the left side of the face, and a highly significant difference between the lateral two fifths on the right and the left side of the face, since a small degree of facial asymmetry is present in most individuals and it is considered to be a normal feature. Pearson correlation coefficient showed a high significant and moderate correlation between interalar width and inner canthal distance and a high significant and moderate correlation between the mouth width and the distance between the points at the most medial margin of the iris of the eyes, since these measurements are considered to be a part of the symmetrical face (normal transverse facial proportions).

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