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Bivariate optimization of orthodontic mini-implant thread height and pitch

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Abstract

 Purpose

Mini-implants have been used as anchorage for years, but failure is common in clinical practice. Mini-implant design is a critical factor affecting its stability. The aim of this study was to evaluate the effect of continuous and simultaneous variations of thread height and pitch on the biomechanical properties of an orthodontic mini-implant.

Method 

A 3D finite element model, composed of a posterior maxilla section and an orthodontic mini-implant, was created. Mini-implant thread height ranged from 0.10 to 0.40 mm, and thread pitch ranged from 0.50 to 2.00 mm. Effects of the implant thread height and pitch on the maximum Von Mises stresses in maxilla and mini-implant, as well as maximum displacements in the mini-implant, were evaluated by a finite element method. Bivariate analysis was used to determine the optimal range of thread height and pitch.

Results 

Variation of thread height and pitch decreased the maximum Von Mises stresses in cortical bone, cancellous bone and mini-implant by 54.9, 78.4 and 23.6 %, respectively. The maximum displacement in the mini-implant decreased by 21.8 %.

Conclusion 

Maxillary stress and mini-implant stability were influenced by mini-implant thread height and pitch. Increased thread height with a thread pitch of 1.20 mm was better for orthodontic mini-implant in the maxillary posterior region. Thread height played a more significant role than the thread pitch in reducing maxillary stress and enhancing orthodontic mini-implant stability.

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Acknowledgments

This study was funded by National Natural Science Foundation of China (No. 31101042) and Military Youth Development Project (13QNP083)

Conflict of interest

All authors declare that they have no conflict of interest.

Author information

Authors and Affiliations

  1. State Key Laboratory of Military Stomatology, Department of Orthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, 710032, China

    Shuning Shen, Yinzhong Duan & Tao Li

  2. Hainan Branch of PLA General Hospital, Sanya, 572013, China

    Yingying Sun

  3. Department of Neurology, Second Artillery General Hospital of PLA, Beijing, 100088, China

    Chen Zhang

  4. Department of Stomatology, Second Artillery General Hospital of PLA, Beijing, 100088, China

    Yongjin Yang, Zhiren Li, Xingwei Cai & Tao Li

Authors
  1. Shuning Shen
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  2. Yingying Sun
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  3. Chen Zhang
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  4. Yongjin Yang
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  5. Zhiren Li
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  6. Xingwei Cai
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  7. Yinzhong Duan
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  8. Tao Li
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Corresponding authors

Correspondence to Yinzhong Duan or Tao Li.

Additional information

Shuning Shen and Yingying Sun contributed equally to this work.

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Shen, S., Sun, Y., Zhang, C. et al. Bivariate optimization of orthodontic mini-implant thread height and pitch. Int J CARS 10, 109–116 (2015). https://doi.org/10.1007/s11548-014-1107-8

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  • DOI: https://doi.org/10.1007/s11548-014-1107-8

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