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01.01.2014 | Original Article

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

verfasst von: Mitsuru Motoyoshi, Yasuki Uchida, Miho Matsuoka, Mizuki Inaba, Hiroaki Iwai, Yoko Karasawa, Noriyoshi Shimizu

Erschienen in: Clinical Oral Investigations | Ausgabe 1/2014

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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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Titel: Assessment of damping capacity as an index of root proximity in self-drilling orthodontic mini-implants
verfasst von: Mitsuru Motoyoshi
Yasuki Uchida
Miho Matsuoka
Mizuki Inaba
Hiroaki Iwai
Yoko Karasawa
Noriyoshi Shimizu
Publikationsdatum: 01.01.2014
Verlag: Springer Berlin Heidelberg
Erschienen in: Clinical Oral Investigations / Ausgabe 1/2014
Print ISSN: 1432-6981
Elektronische ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-013-0965-8

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