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Effects of wobbling angle on the stability measures of orthodontic mini-implants during insertion and removal
Il-Sik Cho1, Sang-Ho Baek, Young Ho Kim
1a Clinical Assistant Professor, Department of Dentistry, Korea University Guro Hospital, and PhD graduate student, Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, South Korea.
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°, W-2°, and W-4° 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° group showed the longest IPT and highest TIE and NPIE, followed by the W-2° and W-0° groups (W-0° < W-2° < W-4°, all P < .001). The W-2° and W-4° groups showed significant increase in MIT compared with the W-0° group (W-0° < [W-4°,W-2°]; P < .001). Although there was no significant difference in NPRE among the three groups, the W-4° group showed a decrease in MRT compared with the W-0° and W-2° groups (W-4° < {W-2°,W-0°]; P < .05). Although the W-4° group showed a 14.5% (2.9 Ncm) increase in MIT compared with the W-0° group, there was only a 6% (1.3 Ncm) decrease in MRT from the W-0° group to the W-4° 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.
