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目的:研究自攻与助攻两种植入方式对微种植体生物力学性能的影响。方法:采用自身对照原则,将36枚微种植体植入6只成年Beagle犬上颌后牙区。左右各植入3枚种植体,一侧以自攻植入,对侧以助攻植入。每侧随机分配植入不同愈合时间(2、4、8周)的种植体,在实验8周末,处死动物,取材与固定,获得带有微种植体的骨块进行拉拔力试验。结果:2周,4周时,自攻植入的微种植体平均拉拔力值均高于助攻方式植入者,无论自攻还是助攻其拉拔力均随愈合时间的延长而增大,且两种植入方式2周愈合与8周愈合均有显著差异,仅在助攻组发现2周愈合时间与4周愈合时间的平均拉拔力出现显著差异。结论:需要早期加载的微种植体尽量选择自攻植入,而为了提高助攻植入微种植体的初期稳定性,需适当延长愈合时间。
Objective: To study the effects of self-tapping and assisting implantation on the biomechanical properties of micro-implants. Methods: Using self-control principle, 36 micro-implants were implanted into the maxillary posterior teeth of 6 adult Beagle dogs. Implant three implants, one side to self-tapping implantation, contralateral to assist implantation. On each side, implants implanted with different healing time (2, 4, 8 weeks) were randomly allocated. At the end of 8 weeks, the animals were sacrificed, drawn and fixed, and the bone with micro-implants was taken for pullout test. Results: At 2 weeks and 4 weeks, the average pull-out strength of self-tapping micro implants was higher than that of assisting methods. The pull-out force of self-tapping micro-implants increased with the prolongation of healing time, There was a significant difference between the two methods of healing in 2 weeks and 8 weeks of healing. Only in the assisting group, there was a significant difference in average pullout force between 2 weeks and 4 weeks. CONCLUSIONS: Micro-implants that require early loading should be chosen for self-tapping implantation. In order to improve the initial stability of the implanted micro-implants, the healing time should be appropriately prolonged.