교정력의 즉시 부하가 미니스크류의 제거 회전력에 미치는 영향의 평가
Influence of immediate loading on the removal torque value of mini-screws
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교정치료에서 고정원의 조절은 교정 장치의 선택과 적용에서 가장 중요한 요소 중 하나이다. 이 연구의 목적은 교정용 미니스크류의 식립 즉시 교정력을 적용한 군과 교정력을 적용하지 않은 군의 제거회전력 측정과 조직학적 분석을 통해 즉시 교정력을 가한 미니스크류의 고정원으로서의 안정성을 확인하여 식립 후 교정력을 적용 수 있는 시기의 선택에 도움을 주고자 하는 것이다. 외경 1.6 mm. 길이 8 mm인 총 40개의 타이타늄 미니스크류를 10마리 가토의 경골에 식립하였다. 20개의 미니스크류 실험군은 식립 직후부터 6주 동안 지속적인 200 g의 교정력을 적용하였고 나머지 20개의 미니스크류 대조군은 교정력을 적용하지 않았다. 제거 회전력은 디지털 토크 게이지를 이용하여 측정하였으며 t-test를 이용하여 통계처리 하였고, 조직표본은 미니스크류를 제거한 후 H-E 염색하여 조직 소견을 관찰하였다. 제거회전력은 실험군과 대조군에서 통계학적으로 유의성 있는 차이를 보이지 않았으며, 조직학적으로 두 군간의 차이는 없었다. 본 연구의 결과는 교정용 미니스크류에 즉시 교정력을 가하더라도 안정적인 고정원으로 활용 할 수 있다는 점을 제시한다. (대치교정지 2007;37(6):400-6)
Abstract
Objective: 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 200 g 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. (Korean J Orthod 2007;37(6):400-6)
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