Effects of wobbling angle on the stability measures of orthodontic mini-implants during insertion and removal procedures
- Authors
- Cho, Il-Sik; Baek, Sang-Ho; Kim, Young Ho
- Issue Date
- 11월-2013
- Publisher
- E H ANGLE EDUCATION RESEARCH FOUNDATION, INC
- Keywords
- Stability measures; Orthodontic mini-implants; Wobbling
- Citation
- ANGLE ORTHODONTIST, v.83, no.6, pp.1009 - 1014
- Indexed
- SCIE
SCOPUS
- Journal Title
- ANGLE ORTHODONTIST
- Volume
- 83
- Number
- 6
- Start Page
- 1009
- End Page
- 1014
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/101735
- DOI
- 10.2319/021513-134.1
- ISSN
- 0003-3219
- Abstract
- Objective: To investigate the effects of wobbling angle on the stability measures of orthodontic mini-implants (OMIs) during insertion and removal procedures in artificial bone blocks. Materials and Methods: A total of 36 OMIs (self-drilling type, cylindrical shape, 7 mm in length, 1.45 mm in diameter) were allocated into three groups according to the amount of wobbling angle (W-0 degrees, W-2 degrees, and W-4 degrees groups; N=12 per group). The OMIs were installed and subsequently removed from artificial bone blocks (Sawbone) using a driving torque tester with a uniform speed of 28 rpm. Insertion peak time (IPT), maximum insertion torque (MIT), total insertion energy (TIE), near-peak insertion energy (NPIE), maximum removal torque (MRT), and near-peak removal energy (NPRE) were measured. Results: The W-4 degrees group showed the longest IPT and highest TIE and NPIE, followed by the W-2 degrees and W-0 degrees groups (W-0 degrees < W-2 degrees < W-4 degrees, all P < .001). The W-2 degrees and W-4 degrees groups showed significant increase in MIT compared with the W-0 degrees group (W-0 degrees < [W-4 degrees,W-2 degrees]; P < .001). Although there was no significant difference in NPRE among the three groups, the W-4 degrees group showed a decrease in MRT compared with the W-0 degrees and W-2 degrees groups (W-4 degrees < [W-2 degrees,W-0 degrees]; P < .05). Although the W-4 degrees group showed a 14.5% (2.9 Ncm) increase in MIT compared with the W-0 degrees group, there was only a 6% (1.3 Ncm) decrease in MRT from the W-0 degrees group to the W-4 degrees group. Conclusion: Slight wobbling during the OMI insertion procedure may be acceptable in terms of the stability measures of OMIs during insertion and removal procedures.
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