Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (9): 1572-1576.doi: 10.3969/j.issn.1673-8225.2010.09.012

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Hard-soft tissue changes with the Twinblock appliance in Class Ⅱ malocclusion patients

Cui Li-juan1, Liu Ya-fei2, Zuo Yan-ping2, Lü Tong1, Liu Xin3, Liu Xue-cong4, Chen Wen-jing5   

  1. 1School of Basic Medical Sciences, Hebei Medical University, Shijiazhuang   050017, Hebei Province, China;
    2Department of Orthodontics, First Hospital of Hebei Medical University, Shijiazhuang   050031, Hebei Province, China; 3Clinical Medical School, Hebei Medical University, Shijiazhuang   050017, Hebei Province, China;
    4Children’s Hospital of Hebei Province, Shijiazhuang   050031, Hebei Province, China;
    5School of Stomatology, Hebei Medical University, Shijiazhuang   050017, Hebei Province, China
  • Online:2010-02-26 Published:2010-02-26
  • Contact: Zuo Yan-ping, Professor, Chief physician, Department of Orthodontics, First Hospital of Hebei Medical University, Shijiazhuang 050031, Hebei Province, China; zyp6381@sina.com
  • About author:Cui Li-juan, Studying for master’s degree, Associate professor, School of Basic Medical Sciences, Hebei Medical University, Shijiazhuang 050017, Hebei Province, China cui641203@163.com
  • Supported by:

    the Science and Technology Development Program of Hebei Province, No.062761380*

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Abstract:

BACKGROUND: Twin block appliance has been shown to effectively promote mandibular bone growth of Class Ⅱ malocclusion patients and improve lateral appearance of mandibular retrusion. The other improvement of Twin block appliance on hard-soft tissues remains unclear.
OBJECTIVE: To assess the hard-soft tissue changes following Twinblock appliance treatment.
METHODS: A total of 48 adolescent patients, 30 males and 18 females, aged 11.6 years (range 9.58-12.37) with Class Ⅱ malocclusion were selected from Department of Orthodontics, Affiliated Stomatology Hospital of Hebei Medical University. Of them, 27 were treated with Twinblock appliance as the treatment group, and 21 adolescent patients without treatments were selected as the control group. Cephalonetric analysis was used to compare the changes before and after treatment.
RESULTS AND CONCLUSLON: Comparative analysis showed that Twinblock could effectively adjust or improve the effect of the natural growth, reduced upper lip convexity and mentolabial furrow angle. Moreover, Twinblock inhibited facial vertical distance reduction and facial convexity increase to decrease the potential differences between maxillary and mandibular bones in sagittal plance. Results show that Twinblock could effectively improve the profile of soft-tissues of Class Ⅱ malocclusion cases.

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