Aesthetic evaluation of profile incisor inclination.
The objectives of this study were to evaluate (1) the impact of maxillary incisor inclination on the aesthetics of the profile view of a smile, (2) to determine the most aesthetic inclination in the profile view of a smile and correlate it with facial features, and (3) to determine if dentists, orthodontists, and laypeople appreciate differently incisor inclination in smile aesthetics. A smiling profile photograph of a female subject (22 years of age) who fulfilled the criteria of soft tissue normative values and a balanced smile was obtained. The photograph was manipulated to simulate six lingual and labial inclinations at 5 degree increments to a maximum of 15 degrees. The seven photographs were randomly distributed in a binder to three groups of raters (30 dentists, 30 orthodontists, and 30 laypeople) who scored the attractiveness of the photographic variations using a visual analogue scale. Comparison of the mean scores was carried out by repeated analysis of variance, univariate tests, and multiple Bonferroni comparisons. The results showed a statistically significant interaction between the rater's profession and the aesthetic preference of incisor inclination (P = 0.013). The profile smile corresponding to an increase of 5 degrees in a labial direction had the highest score among all professions and among male and female raters. Orthodontists preferred labial crown torque; dentists and laypeople did not appreciate excessive incisor inclination in either the lingual or the labial directions. The most preferred smile matched with a maxillary incisor inclined 93 degrees to the horizontal line and +7 degrees to the lower facial third.
Ghaleb
Nathalie
N
Department of Orthodontics, Faculty of Dental Medicine, Medical Sciences Campus, Saint-Joseph University, Beirut, Lebanon.
Bouserhal
Joseph
J
Bassil-Nassif
Nayla
N
D000328:Adult; D000704:Analysis of Variance; D001290:Attitude; D002508:Cephalometry; D003815:Dentists; D004955:Esthetics, Dental; D005145:Face / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007180:Incisor / Q000033:anatomy & histology*; D008297:Male; D008437:Maxilla; D015588:Observer Variation; D009970:Orthodontics; D023861:Photography, Dental; D011639:Public Opinion; D012904:Smiling; D018709:Statistics, Nonparametric; D055815:Young Adult