Soft tissue profile preference of Layperson among different cultures
Taee, Adam A.
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OBJECTIVES: To assess the profile preferences of laypeople in (USA, Switzerland, Lebanon, South Africa, Japan, Saudi Arabia and Turkey), and to assess if gender, age, race, education and income had influence on decision. METHODS: 535 laypersons rated fifty profile silhouettes of profile after altering the lip in five 1 mm increments in the sagittal direction and nose in three sagittal and vertical directions, creating 45 combinations. Demographics were collected. The soft tissue values were incorporated. ANOVA with post hocTukey test were used to compare difference in means in each location. Multivariate regression model was used to assess the effect of demographics on preference. RESULTS: The mean preference was significantly different across locations at p-value of <.0001. In the United States and Lebanon, the most preferred profile was original lip and nose, in Switzerland and South Africa, was L-2, N A -1, V -1, in Japan and Saudi Arabia, was L0, N A +1, V-1, and in Turkey, was L+2, N A -1, V+1. Profile change, location, gender and race were significant confounders at p-value of <.0001, <.0001, <.0001 and 0.02 respectively, on the other hand, age, education and income were not. CONCLUSION: Layperson’s perception of lip and nose position is different among the seven locations. Layperson prefer profiles within one standard deviation from the norms for Caucasians behind the E-line. Layperson is not reliable in their rating of lip changes within ∓2 mm. Gender and race are significant confounders unlike age, education and income.