Chin Morphology in Skeletal Class Ⅲ Subjects with Hyperdivergent at Different Dentition Stages.

doi:10.13701/j.cnki.kqyxyj.2018.04.016

Abstract

Abstract: Objective: To analyze specific features and development tendency of chin morphology in hyperdivergent skeletal class Ⅲ malocclusion. Methods: One hundred and twenty subjects of hyperdivergent were divided into mixed dentition group (7-10 years old), young permanent dentition group (11-14 years old), and mature permanent dentition group (18 years old and over). Then each group was divided into classⅠmalocclusion group and class Ⅲ malocclusion group. Cephalograms were analyzed for all subjects to study chin morphology. Results: Excessive development of chin appeared in mixed dentition. Then, in young permanent dentition, mental excessive development became more apparent, and lower incisors appeared compensative changes. All of these were further aggravated in mature permanent dentition. In permanent dentition, the chin of skeletal class Ⅲ subjects of hyperdivergent showed common characteristics such as small chin angle, large chin protrusion, and small chin curvature. Conclusion: Chin of skeletal class Ⅲ subjects of hyperdivergent has its unique development pattern and morphological characteristics.

Key words: Chin, Skeletal class Ⅲ, Hyperdivergent, Dentition stage, Development

GE Xiao-lei, LIU Ye, LIU Chun-yan, ZHANG Wei-ling, LIU Yang, ZHANG Li, MA Wen-sheng. Chin Morphology in Skeletal Class Ⅲ Subjects with Hyperdivergent at Different Dentition Stages.[J]. Journal of Oral Science Research, 2018, 34(4): 401-404.

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