关键词: 侧貌, 自我感知, 面下1/3高度, 面凸角, 审美, 正畸学

Abstract: PURPOSE: To investigate the profile self-perception of lower anterior facial height(LAFH) by patients seeking orthodontic treatment, and explore the influencial factors. METHODS: Profile photographs of two Chinese adults (one female and one male with normal profiles) were digitized to create two baseline templates. Changes in middle anterior facial height / lower anterior facial height ratio were made on the templates by altering lower anterior facial height from 0.5 to 1.5 in 0.1 increments. An electronic questionnaire survey was conducted among patients who met the sample criteria. They were asked to choose one from various photos that most resembled their own profile. Then profile photos of patients were taken and measured. Differences between self-perception profile and actual profile were compared using paired t test. Statistical analysis was employed for comparison between different age, genders, profile concerns, education backgrounds, orthodontic histories, marital status and facial types with SPSS 17.0 software package. RESULTS: Two hundred and twenty-six subjects (average age 19.2±; 6.0 years; 79 men, 147 women) were interviewed in this survey. The ratio of self-perception profile by the patients was lower than actual. Difference was significant between patients' actual profile and self-perception profile(P<; 0.01).Among the seven factors,profile concerns（P<; 0.01） and orthodontic history (P=0.002) were significantly correlated with profile self-perception of lower anterior facial height by the patients. CONCLUSIONS: There is a cognitive bias in profile self-perception of lower anterior facial height by patients seeking orthodontic treatment. The patients' self-perception of lower anterior facial height is influenced by profile concerns and orthodontic history, not by age, sex, education backgrounds, marital status and facial types.

Key words: Facial profile, Self-perception, Lower anterior facial height, Facial convexity, Aesthetics, Orthodontics