Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (50): 9370-.doi: 10.3969/j.issn.1673-8225.2010.50.015

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Histological changes of periodontal ligament during rapid tooth movement through reducing resistance and distraction 

Qi Tao1, Lu Jia-jing2, Ge Zhen-lin1, Su Shao-chen3, Yang Cai-xia1   

  1. 1 School of Stomatology, Lanzhou University, Lanzhou  730000, Gansu Province, China; 2 Department of Stomatology, Taizhou Polytechnic College, Taizhou  225300, Jiangsu Province, China; 3 Department of Stomatology, Second Hospital of Lanzhou University, Lanzhou  730000, China
  • Online:2010-12-10 Published:2010-12-10
  • Contact: Ge Zhen-lin, Associate professor, School of Stomatology, Lanzhou University, Lanzhou 730000, Gansu Province, China gezhl@lzu.edu.cn
  • About author:Qi Tao★, Studying for master’s degree, School of Stomatology, Lanzhou University, Lanzhou 730000, Gansu Province, China qit07@sohu.com
  • Supported by:

     the Natural Science Foundation of Gansu Province, No. 0710RJZA029*; Science and Technology Foundation of Medical Department of Lanzhou University, No. LZUYX200705*

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Abstract:

BACKGROUND: Rapid movement of orthodontic tooth can be achieved with the method of reducing resistance and distraction. However, the histological changes of the periodontal ligament during orthodontic tooth movement are not yet very clear.
OBJECTIVE: To observe the histological changes of periodontal ligament during rapid tooth movement through reducing resistance and distraction.
METHODS: A self-control design was employed. The second premolars on both sides were extracted and one side was randomly selected as experimental side and the other as control side. The first premoalrs were distalized respectively using the method of reducing resistance and distraction on the experimental side and traditional methods on the control side. The distance of the tooth movement was measured at the end of 2nd week after the activation. The animals were sacrificed at 1, 2, 4 and 12 weeks after the activation. The periodontal ligament histological changes of moving tooth were observed by a light microscope.
RESULTS AND CONCLUSIONS: The method of reducing resistance and distraction accelerated the periodontal ligament remodeling and alveolar bone absorbing (pressure side), new born growing (tension side). There was no significantly difference between the pressure side and the tension side of experimental moved teeth and control moved teeth at 12 weeks groups. The average distal movements of moved teeth by the experimental side were significantly greater than control side at 2 weeks (P < 0.05). There was no difference in quality but in quantity on the histological reactions of the tooth moved by traditional method and by the method of reducing resistance and distraction, the latter could accelerated tooth movement than the former.

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