ABSTRACT
Objective • To research the effect of malar prominence on the attractiveness of lip position. Methods • A woman conforming to the Holdaway analysis method was selected and 28 3D head models with different malar prominences and lip positions were obtained by 3D MAX software. Then orthodontists (professional group, n=42) and laypeople (nonprofessional group, n=100) were chosen to score the head models by visual analogue scale (VAS). Results • In the case of different malar prominence, the highest scores in the professional group were -2 mm and 0 mm in lip position, but the lip position with high scores in the nonprofessional group varied with the increase of malar prominence; -2 mm in malar prominence was the highest score in the professional group and the nonprofessional group, and +4 mm scores in malar prominence were the lowest in both groups. In the concave profile, the scores of the nonprofessional group were higher than those of the professional group, while in the convex profile, the results reversed. Conclusion • The preference of lip positions among laypeople is affected by the increase of malar prominence; however, this will not affect the aesthetics of orthodontists. People prefer the slightly concave profile and dislike the protruding malar prominence.
ABSTRACT
OBJECTIVE: The purposes of this study were to evaluate the nasolabial angle changes between closed lip position at centric occlusion and relaxed lip position at which the bite is open so that the lips do not touch and to elucidate the significance of the relaxed lip position for dentofacial diagnosis. METHODS: The subjects consisted of 60 (35 Males, 25 Females) skeletal Class III malocclusion adult patients (mean age 23.3 years) with anterior crossbite. RESULTS: In Class III malocclusion adult patients, there were significant differences in the nasolabial angle changes between closed lip position and relaxed lip position. Using the cluster analysis, the subjects were divided into three groups according to the pattern of nasolabial angle change: Group 1 (N = 27, 45%, -8 ~ 1), Group 2 (N = 30, 50%, 2degrees ~ 17), and Group 3 (N = 3, 5%, over 18). CONCLUSION: The results showed that the pattern of the nasolabial angle change between closed lip position and relaxed lip position varies in skeletal Class III malocclusion patients. Thus, relaxed lip position should be taken into account when diagnostic records are obtained and analyzed to accurately to evaluate the facial soft tissues and predict facial esthetics after surgical-orthodontic treatment.
Subject(s)
Adult , Humans , Male , Diagnosis , Esthetics , Lip , MalocclusionABSTRACT
OBJECTIVE: While one of the most prevailing motivations for seeking orthodontic treatment is to achieve good facial esthetics, understanding the level of a person's perception to the changes that have occurred on the face after orthodontic treatment is critical to the process of orthodontic diagnosis and treatment planning. METHODS: 40 students attending art school participated in determining the level of their perception of changed lip position and facial asymmetry. Computer-graphic frontal face and facial profile photographs with balanced proportions were used to evaluate the level of a participant's perception of the changes in facial asymmetry and in lip position. RESULTS: Change of lip position over 2 mm and over a 3 mm change of facial asymmetry was perceived significantly. CONCLUSION: The results indicated that at least a 2 mm change of lip position was needed to be perceived after orthodontic treatment. The level of perception of the change in facial asymmetry was lower than that of the change in lip position. Information about facial changes given prior to the evaluation enhanced the level of perception.