Upper lip changes and gingival exposure on smiling in group with class 1 normal occlusion

الملخص EN

Our objectives were to evaluate and quantify upper lip soft-tissue changes in the vertical dimensions both at rest and at maximum smile.

Methods thirty three volunteers (15 men, 18 women) aged 18 to 23 (mean, 21.5 years) were recruited for this study.

For each subject, 8 measurements of upper lip position and maxillary incisor crown height at rest and in maximum smile were recorded.

Results : A statistically significant sexual dimorphism was apparent in most of the measured variables.

Relaxed external upper lip length was 1.8 mm mm shorter in the women than in the men.

The mean maxillary central incisor length was 0.56 mm greater in the men than in the women.

A low smile line was more prevalent in the women, The average smile is more prevalent in male than female.

Conclusions : Data from this study clearly indicate sexual dimorphisms in upper lip length, maxillary incisor display, and resting external upper lip length.

Low smile patterns are more common among female patients, and also common among male patients while high smile are less common among female and male patients.

The average smile is more prevalent in male than female.