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KMID : 0361920070370060400
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Korean Journal of Orthodontics
2007 Volume.37 No. 6 p.400 ~ p.406
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Influence of immediate loading on the removal torque value of mini-screws
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Sun Seung-Bum
Kang Yoon-Goo
Kim Seung-Hun
Mo Sung-Seo
Kook Yoon-Ah
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Abstract
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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.
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KEYWORD
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Immediate orthodontic loading, Orthodontic miniscrews, Removal torque
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