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Influence of immediate loading on the removal torque value of mini-screws  

Sun, Seung-Bum (Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea)
Kang, Yoon-Goo (Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea)
Kim, Seung-Hun (Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea)
Mo, Sung-Seo (Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea)
Kook, Yoon-Ah (Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea)
Publication Information
The korean journal of orthodontics / v.37, no.6, 2007 , pp. 400-406 More about this Journal
Abstract
The purpose of this experimental study was to evaluate the effect of immediate orthodontic loading on the stability at the bone-implant interface of titanium miniscrews in a rabbit model. Methods: Forty titanium miniscrews (1.6 mm diameter, 8 mm length) were inserted in the tibiae of 10 rabbits. Twenty test group miniscrews were subjected to continuous orthodontic forces of 200g immediately after implantation for a period of 6 weeks. The remaining 20 control group miniscrews were left unloaded for the same follow-up interval. Removal torque values were recorded using a digital torque gauge. An independent t-test was performed. Results: All the miniscrews were stable, and exhibited no mobility or displacement throughout the experimental period. Histologically, miniscrews were well-integrated into bone. No statistically significant differences in removal torque data were found between the loaded test and the unloaded control groups. Conclusions: These findings suggest that titanium miniscrews can be used as anchoring units for orthodontic tooth movement immediately after insertion.
Keywords
Immediate orthodontic loading; Orthodontic miniscrews; Removal torque;
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