TY - JOUR
T1 - Assessment of damping capacity as an index of root proximity in self-drilling orthodontic mini-implants
AU - Motoyoshi, Mitsuru
AU - Uchida, Yasuki
AU - Matsuoka, Miho
AU - Inaba, Mizuki
AU - Iwai, Hiroaki
AU - Karasawa, Yoko
AU - Shimizu, Noriyoshi
PY - 2014/1
Y1 - 2014/1
N2 - 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.
AB - 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.
KW - Damping capacity assessment
KW - Mini-screw
KW - Orthodontic
KW - Temporary anchorage device
UR - http://www.scopus.com/inward/record.url?scp=84891560055&partnerID=8YFLogxK
U2 - 10.1007/s00784-013-0965-8
DO - 10.1007/s00784-013-0965-8
M3 - Article
C2 - 23519743
AN - SCOPUS:84891560055
SN - 1432-6981
VL - 18
SP - 321
EP - 326
JO - Clinical Oral Investigations
JF - Clinical Oral Investigations
IS - 1
ER -