Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (4): 625-628.doi: 10.3969/j.issn.1673-8225.2011.04.013

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Torsional stability of innovative versus traditional split crimpable hooks 

Liu Ke-jin1, Ji Li2, Li Chi-bin2, Huang Dai-ying2, Zhong Xiao-long2   

  1. 1Stomatology Hospital of Southern Medical University, Stomatology Hospital of Guangdong Province, Guangzhou  510280, Guangdong Province, China
    2Department of Stomatology, First Hospital of Sun Yat-sen University, Guangzhou  510080, Guangdong Province, China
  • Received:2010-06-07 Revised:2010-12-06 Online:2011-01-22 Published:2011-01-22
  • Contact: Zhong Xiao-long, Associate professor, Master’s supervisor, Department of Stomatology, First Hospital of Sun Yat-sen University, Guangzhou 510080, Guangdong Province, China zxlpd@163.com
  • About author:Liu Ke-jin★, Master, Physician, Stomatology Hospital of Southern Medical University, Stomatology Hospital of Guangdong Province, Guangzhou 510280, Guangdong Province, China wendy0501@qq.com Ji Li, Master, Attending physician, Department of Stomatology, First Hospital of Sun Yat-sen University, Guangzhou 510080, Guangdong Province, China dr_jili@163.com Liu Ke-jin and Ji Li equally contributed to this paper.
  • Supported by:

    the Science and Technology Development Program of Guangdong Province, No. 2009B060700043*

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Abstract:

BACKGROUND: Traction is a method generally used in orthodontic treatment by which the movement of teeth can be manipulated. However, the split crimpable hooks currently used appear to unwished slide sometimes, due to insufficient resistance, which cannot achieve the en-mass movement of teeth.
OBJECTIVE: To develop a new type of archwire hook assembly (uncrimpable split hook with pin) and to compare the torsional stability with traditional split hook.
METHODS: The new archwire hooks composed of split box-form body, hook and pin were designed and manufactured. A total of 30 innovative archwire hooks and 30 traditional AO split hooks were respectively attached to a 0.019 × 0.025-inch stainless steel archwire. The archwire/hook attachment assembly was fitted into a dual contact jig and securely mounted to the base of a universal testing machine. The force that required to dislodge the hooks on the archwire was measured. The resistance of dislodgement of two hooks was compared.
RESULTS AND CONCLUSION: The mean forces required to dislodge the hooks measured in newtons (N) were as follows: new archwire hooks (22.37±9.06) N, traditional split crimpable hooks (4.96±0.70) N. The new archwire hooks provide more resistance to torsional dislodgement from a rectangular stabilizing archwire than traditional split crimpable hooks.

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