The influence of the profile incisor inclination on the esthetic perception of the smile.
Keywords:
Influence of tilt, lateral incisor, aesthetic perception of smileAbstract
This study was survey research by cross-sectional study aimed to evaluate differences in the perception of smile esthetics between orthodontists and laypersons when viewing lateral smile profiles with varying degrees of upper incisor inclination, and to examine the relationship between incisor inclination and esthetic perception within each group. Lateral smile photographs of a 29-year-old female who met the inclusion criteria were digitally manipulated to create seven upper incisor inclinations ranging from +15 to –15 degrees in 5 degrees increments. Each image was duplicated and randomly ordered, resulting in 14 images scored using a Numerical Rating Scale (1–10). The evaluators consisted of 120 orthodontists and 120 laypersons. 2-Sample Independent t-test analysis showed that laypersons assigned significantly higher esthetic scores than orthodontists at 70°, 75°, and 85° at a significance level of 0.05 (p < 0.05), while no significant differences were observed at 80°, 90°, 95°, and 100° (p > 0.05). Pearson’s Chi-square test revealed that the proportions of subjects selecting each angulation differed significantly between the two groups, including for the most-preferred (X² = 15.77, p = 0.015) and least-preferred images (X² = 35.20, p < 0.001). Both groups most frequently preferred the 85° inclination; however, orthodontists least preferred 70°, whereas laypersons least preferred 100°.
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