Difference in Preference of Chin Projection
- According to Frontal Facial Form and Gender
Hyungmo KIM
DDS, MSD
Assistant professor
Department of Oral & Maxillofacial Surgery
Soonchunhyang University Bucheon Hospital
Bucheon, KOREA
ABSTRACT
Objective:
To investigate the preferred chin projection (CP)
according to frontal facial forms and gender using three-dimensional (3D)
facial morphed images.
Materials and methods: 3D
facial images of three males and three females with eury- (Eury-FF), meso- (Meso-FF),
or lepto-prosopic frontal facial form (Lepto-FF) were obtained using a
3D-facial scanner (Morpheus Co., Ltd., Seoul, Korea). With a software (Morpheus
3D Aesthetic Solution Ver. 2.0), CP was changed into 10° of the soft tissue facial
profile angle (glabella-subnasale-soft tissue pogonion) as a normal. Then CPs
were morphed from normal (10°) by an increment of 2° [moderately protrusive
(6°), slightly protrusive (8°), slightly retrusive (12°) and moderately
retrusive (14°)]. A total of 75 dental students were asked to rate the five CPs
from the most preferred one to the worst one in each facial form of male and
female 3D-images. Chi-square test was performed for statistical analysis.
Results: The most preferred CP was significantly different among
facial forms (P<0.001): normal (35%) in Meso-FF; slightly protrusive (40%) in Eury-FF;
and slightly retrusive (39%) in Lepto-FF. In Meso-FF, gender did not
exhibit a difference in the most preferred CP (normal, 33% in male and 36% in
female). However, in Euery-FF, male favored slightly
protrusive CP (49%) but female liked slightly protrusive and normal CPs (31%
and 33%) (P<0.01). In Lepto-FF, normal CP (43%) was favored in male, whereas
slightly retrusive CP (51%) was favored in female (P<0.05).
Conclusion: These
findings might be used as a guideline when clinicians plan orthognathic surgery
and/or adjunctive esthetic surgery.
