Soft tissue profile analysis in lip position of Han nationality adolescents in Lanzhou

doi:10.3969/j.issn.2095-4344.2013.20.023

Abstract

Abstract:

BACKGROUND: Orthodontic treatment for facial appearance changes is mainly realized by improving the patient’s lip inclination of the anterior teeth to make the patient’s soft tissue profile more coordinating and beautiful.
OBJECTIVE: To study lip protrusion in Han adolescent in Lanzhou region of soft tissue profile and assess esthetic differences between laypersons and orthodontists on the soft tissue profile of adolescents in different lip positions.
METHODS: A facial silhouette of the male and female soft tissue profile was constructed using Photoshop8.0 via soft tissue profile analysis from cephalometric radiographs of individual normal occlusions in 80 Han adolescents from Lanzhou region. Thirteen facial silhouettes of soft tissue profile were developed by 1 mm lip protrusion or retrusion as unit. Fifty laypersons and fifty orthodontists were asked to select the three most-favored soft tissue pro?les for each sex from a series of facial silhouettes with varying anteroposterior lip positions, rank them in order of preference and select the least-favored pro?le for each sex.
RESULTS AND CONCLUSION: The lip protrusion values in Lanzhou area of Han male soft tissue profile relative to Sn-Pg’ line were (7.50±1.72) mm for the upper lip and (5.86±1.83) mm for the lower lip. The lip protrusion values of female soft tissue profile relative to Sn-Pg’ were (6.23±1.73) mm for the upper lip and (4.94±2.03) mm for the lower lip. The most-favored lip protrusion relative to Sn-Pg’ line rated by the laypersons for male was 3.5-5.5 mm for the upper lip and 1.9-3.9 mm for the lower lip, which rated by the orthodontists was 5.5-7.5 mm for the upper lip and 3.9-5.9 mm for the lower lip. The most-favored lip protrusion relative to Sn-Pg’ line rated by the laypersons for female was 2.2-4.2 mm for the upper lip and 0.9-2.9 mm for the lower lip, which rated by the orthodontists was 4.2-6.2 mm for the upper lip and 2.9-4.9 mm for the lower lip. Both the laypersons and the orthodontists preferred a soft tissue pro?le with slightly retruded lip position. But the laypersons favored a more retruded lip position for female and male, there were significant differences between the laypersons’ and the orthodontists’ preference (P < 0.05). The laypersons preferred a soft tissue pro?le with more retruded lip position. The least-favored soft tissue pro?le was the most protrusive.

Key words: tissue construction, tissue construction clinical practice, soft tissue profile, profile, lip position, lip protrusion, individual normal occlusion, skull, adolescents, aesthetic, non-professional, orthodontics, outline

CLC Number:

R318

Liang Yan-hua, Li Zhen-ya. Soft tissue profile analysis in lip position of Han nationality adolescents in Lanzhou [J]. Chinese Journal of Tissue Engineering Research, 2013, 17(20): 3777-3784.

Figures/Tables 2

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