Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (46): 8734-8736.doi: 10.3969/j.issn.1673-8225.2011.46.044

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Changes in morphological characteristics of chin soft tissue profile before and after class Ⅲ malocclusion treatment

Wang Ling1, 2, Li Zhen-ya3   

  1. 1Medical College of Stomatology, Lanzhou University, Lanzhou  730030, Gansu Province, China
    2Department of Stomatology, Medical College, Northwest University of Nationalities, Lanzhou  730030, Gansu Province, China
    3Department of Stomatology, People’s Hospital of Gansu Province, Lanzhou  730030, Gansu Province, China
  • Received:2011-06-06 Revised:2011-09-11 Online:2011-11-12 Published:2011-11-12
  • Contact: Li Zhen-ya, Department of Stomatology, People’s Hospital of Gansu Province, Lanzhou 730030, Gansu Province, China liner.w1223@yahoo.com.cn
  • About author:Wang Ling★, Studying for master’s degree, Lecturer, Medical College of Stomatology, Lanzhou University, Northwest University of Nationalities, Lanzhou 730030, Gansu Province, China; Department of Stomatology, Medical College, Northwest University of Nationalities, Lanzhou 730030, Gansu Province, China liner.w1223@yahoo. com.cn

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Abstract:

BACKGROUND: Previous studies regarding morphological characteristic of mental region are performed to quantitatively analyze the soft and hard tissue of tooth and mental region before and after treatment.
OBJECTIVE: To investigate the changes in morphological characteristic of chin soft tissue profile before and after class  Ⅲmalocclusion treatment.
METHODS: The sample was composed of 48 adolescents aged 12-16 years who presented class Ⅲ malocclusion. Cephalograms were analyzed for all subjects, and the morphology of the symphysis before and after treatment was measured. Paired student’s t test was performed through the use of SPSS16.0 software package.
RESULTS AND CONCLUSION: After treatment, the length of chin (LL-Pos) decreased (P=0.000), Bs-LLPos was larger (P=0.000), ∠LL-Bs-Pos (P=0.000) and ∠Bs-Pos-Mes (P=0.004) were decreased compared with before treatment. After treatment, all cephalogram dates of chin convexity were smaller compared with before treatment (P < 0.05). The thickness of chin soft tissue was decreased after treatment compared with that before treatment (P < 0.05). The morphological characteristic of chin soft tissue became better after treatment compared with before treatment.

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