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Year : 2013  |  Volume : 1  |  Issue : 1  |  Page : 27-32

Turning subjective into objective: Profile smile perception of I2 (incisor inclination) and its impact on treatment planning

Department of Orthodontics, A.M.E.'s Dental College, Hospital and Research Center, Bijengera Road, Raichur - 584 103, Karnataka, India

Correspondence Address:
Raghu Devanna
Department of Orthodontics, A.M.E.'s Dental College, Hospital and Research Center, Bijengera Road, Raichur - 584 103, Karnataka
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Source of Support: None, Conflict of Interest: None

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Objectives: (1) To evaluate 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 whether dentists, orthodontists and laypeople appreciate differently the incisor inclination in smile aesthetics. Materials and Methods: A smiling photograph of a female subject (23 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 (20 dentists, 20 orthodontists and 20 laypeople) who scored the attractiveness of the photographic variations using a visual analogue scale (VAS). Comparisons of the mean scores were carried out by repeated analysis of variance, univariate tests and multiple Bonferroni comparisons. Results: The results showed a statistically significant interaction between the rater's profession and the aesthetic preference of incisor inclination. The profile smile corresponding to an increase in a labial direction had the highest score among all professions and among male and female raters. Conclusions: Orthodontists preferred the labial crown torque; dentists preferred the lingual crown torque; and laypeople appreciated the mild to moderate incisor inclination in both the lingual and the labial directions. The most preferred smile matched with a maxillary incisor inclined 98° to the horizontal line and +8° to the lower third of the face.

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