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

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• 作者：Mitsuru Motoyoshi (1)
  Yasuki Uchida (1)
  Miho Matsuoka (1)
  Mizuki Inaba (1)
  Hiroaki Iwai (1)
  Yoko Karasawa (1)
  Noriyoshi Shimizu (1)
  
• 关键词：Mini ; screw ; Temporary anchorage device ; Orthodontic ; Damping capacity assessment
• 刊名：Clinical Oral Investigations
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：18
• 期：1
• 页码：321-326
• 全文大小：176 KB
• 作者单位：Mitsuru Motoyoshi (1)
  Yasuki Uchida (1)
  Miho Matsuoka (1)
  Mizuki Inaba (1)
  Hiroaki Iwai (1)
  Yoko Karasawa (1)
  Noriyoshi Shimizu (1)
  
  1. Department of Orthodontics, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyodaku, Tokyo, 1018310, Japan
  
• ISSN：1436-3771

文摘

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?±-?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--.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.