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Assessment of damping capacity as an index of root proximity in self-drilling orthodontic mini-implants

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Abstract

Objectives

This study aims to investigate orthodontic mini-implant root proximity, placement torque, and damping capacity and to determine whether placement torque and damping capacity (Periotest value (PTV)) are useful indices for the estimation of mini-implant root proximity.

Materials and methods

The root proximity of 143 orthodontic mini-implants (1.6 mm diameter, 8 mm screw thread length) was evaluated in 79 patients (24 males, 55 females; mean age, 22.5 ± 8 years) using cone-beam computed tomography. The placement torque and PTV of each implant were determined using a torque tester and the Periotest, respectively. Variability in these values according to root proximity was evaluated.

Results

PTVs of mini-implants with multiple (two or more) points of contact between the root and implant were significantly larger than those of mini-implants with no root contact in the self-drilling group. Placement torque did not differ significantly according to root proximity. In the self-drilling group, the odds ratio for root contact was 20.82 (P = 0.000) for a PTV >6.

Conclusions

Placement torque could not be used to estimate root proximity. The PTV was significantly affected by root proximity in the self-drilling group.

Clinical relevance

A threshold of PTV >6 could be applied clinically for the estimation of self-drilling mini-implant root proximity.

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Acknowledgments

We thank the staff of the Department of Radiology, Nihon University School of Dentistry, for their assistance with computed tomography. This study was supported by a Grant-in-Aid for Scientific Research (no. 24593111) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

Conflict of interest

The authors declare that they have no conflicts of interest.

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Authors and Affiliations

  1. Department of Orthodontics, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyodaku, Tokyo, 1018310, Japan

    Mitsuru Motoyoshi, Yasuki Uchida, Miho Matsuoka, Mizuki Inaba, Hiroaki Iwai, Yoko Karasawa & Noriyoshi Shimizu

Authors
  1. Mitsuru Motoyoshi
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  2. Yasuki Uchida
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  3. Miho Matsuoka
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  4. Mizuki Inaba
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  5. Hiroaki Iwai
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  6. Yoko Karasawa
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  7. Noriyoshi Shimizu
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Corresponding author

Correspondence to Mitsuru Motoyoshi.

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Motoyoshi, M., Uchida, Y., Matsuoka, M. et al. Assessment of damping capacity as an index of root proximity in self-drilling orthodontic mini-implants. Clin Oral Invest 18, 321–326 (2014). https://doi.org/10.1007/s00784-013-0965-8

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  • DOI: https://doi.org/10.1007/s00784-013-0965-8

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