PMID: 16634500Apr 26, 2006Paper

Removal torque of miniscrews used for orthodontic anchorage--a preliminary report

The International Journal of Oral & Maxillofacial Implants
Yi-Jane ChenChung-Chen Jane Yao

Abstract

Implant anchors such as miniscrews and miniplates have been loaded immediately for anchorage during orthodontic treatment. The purpose of this study was to measure the removal torque of immediately loaded miniscrews after clinical usage and to determine the possible factors associated with this value. From 29 patients with malocclusions, 46 miniscrews were removed, and removal torque was measured with a torque gauge. Removal torque values were subjected to statistical analysis for possible association of different clinical characteristics. The mean removal torque value was 1.10 kg x cm, and removal torques for 50% of the implants were greater than 0.89 kg x cm (8.7 N x cm). Removal torque values were significantly higher in the mandible than in the maxilla. The removal torques of 15-mm and 17-mm miniscrews were significantly higher than those of 13-mm miniscrews. Therefore, the site of implantation and miniscrew length were important factors associated with removal torque. However, there was no significant correlation between the removal torque value and age, gender, healing time, or time in function. When miniscrews are used as anchorage for uprighting tipped molars, excessive torque in a counterclockwise direction may loosen ...Continue Reading

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