Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (42): 7859-7862.doi: 10.3969/j.issn.1673-8225.2011.42.017

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A comparative study of the static friction force between LF bracket and conventional bracket

Yin Ming-jing1, Hou Lu2, Zhang Ling-bo2, Xu Shi-qian3   

  1. 1Department of Stomatology, Jingwei Hospital, Third Affiliated Hospital of Harbin Medical University, Harbin  150001, Heilongjiang Province, China
    2Department of Stomatology, Second Affiliated Hospital of Harbin Medical University, Harbin  150001, Heilongjiang Province, China
    3Material School, Harbin Institute of Technology, Harbin  150001, Heilongjiang Province, China
  • Received:2011-03-02 Revised:2011-04-10 Online:2011-10-15 Published:2011-10-15
  • Contact: Hou Lu, Chief physician, Department of Stomatology, Jingwei Hospital, Third Affiliated Hospital of Harbin Medical University, Harbin 150001, Heilongjiang Province, China
  • About author:Yin Ming-jing★, Master, Department of Stomatology, Jingwei Hospital, Third Affiliated Hospital of Harbin Medical University, Harbin 150001, Heilongjiang Province, China ymj8377@163.com
  • Supported by:

    the Science and Technology Tackle Key Program of Heilongjiang Province in Health Care Technology*

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Abstract:

BACKGROUND: Compared with traditional brackets, LF brackets have potential of various friction characteristics because of their different ligating methods. But report about it is insufficient.
OBJECTIVE: To study the frictional characteristics of LF bracket when it is sliding along an archwire compared with regular four wings bracket in dry and wet state.
METHODS: The surface states of the stainless steel rectangular archwires were observed with scanning electronic microscope in order to determine the drawing direction when they were manufactured. In dry and artificial saliva environment, the friction was measured by XF-Ⅰtesting machine according to the drawing direction. All factors and levels were completely combined according to factorial designs, including environment, bracket, archwire.
RESULTS AND CONCLUSION: Compared with the regular four wings brackets, the friction of the LF brackets was lower when the main wings were ligated, but higher when all the six wings were ligated. The friction in wet state was higher than that in dry state (P < 0.05). The friction of stainless steel rectangular archwires was higher than that of stainless steel round archwires (P < 0.05). The results above indicate that different ligating methods of LF brackets may provide different frictions. The method of ligating the main wings of LF bracket can be applied in the process of space closure; and the method of ligating all the wings of LF bracket can be applied in moving teeth to a certain position precisely.

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