转矩拮抗型微种植支抗钉的初期稳定性分析

Initial stability analysis of the torque-resisted orthodontic miniscrew anchorage

目的使用扭矩分析和共振频率分析比较一种转矩拮抗型微种植支抗钉与商用微种植支抗钉的初期稳定性差异。方法以猪肋骨为骨组织模型预成长为4.0 mm,直径为1.0 mm的植入孔,植入两种不同的微种植支抗钉。分别测量最大植入扭矩(maximum insertion torque,MIT)、最大旋出扭矩(maximum removal torque,MRT)、种植体稳定系数(implant stability quotient,ISQ)。使用SPSS 13.0软件对数据进行统计分析。结果转矩拮抗型微种植支抗钉的MIT、MRT、ISQ值分别为(11.86±1.58)N·cm、(8.45±2.24)N·cm、61.80±2.93,商用微种植支抗钉的MIT、MRT、ISQ值分别为(10.36±1.42)N·cm、(6.76±1.78)N·cm、58.15±2.98,转矩拮抗型微种植支抗钉的测量结果均大于商用微种植支抗钉,差异具有统计学意义(P<0.05)。结论转矩拮抗型微种植支抗钉的初期稳定性优于商用微种植支抗钉。

Objective To compare the initial stability difference between a new designed torque-resisted orthodontic miniscrew anchorage and commercial miniscrew anchorage by torque tests and resonance frequency analysis（ RFA）.Methods After predrilled 4 mm-deep holes with a diameter of 1. 0 mm, two different miniscrews were implanted into the swine ribs for measurement of maximum insertion torque（ MIT）, maximum removal torque（ MRT） and RFA which was recorded as implant stability quotient（ ISQ）. Statistical analysis was done for all data by SPSS 13. 0. Results The mean value of MIT, MRT, ISQ for new miniscrews were（ 11. 86 ± 1. 58） N·cm,（ 8. 45 ± 2. 24） N· cm and 61. 80 ± 2. 9 while for commercial miniscrews were（ 10. 36 ± 1. 42） N·cm,（ 6. 76 ± 1. 78） N·cm and 58. 15 ± 2. 98. The differences between the two miniscrews were statistically significant（ P 〈0. 05）. Conclusion The torque-resisted miniscrews were more stable than commercial miniscrews.