Effects of cortical bone thickness at different healing times on microscrew stability
Effects of cortical bone thickness at different healing times on microscrew stability
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不同愈合时间皮质骨厚度对微螺钉稳定性的影响
DOI：
10.2319/111610-667.1
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发表时间：
2011-09-01
影响因子：
3.4
通讯作者：
Zhao, Zhihe
中科院分区：
文献类型：
--
作者：
Wei, Xing;Zhao, Lixing;Zhao, Zhihe
目的：比较不同骨皮质厚度对不同愈合时间下微螺钉稳定性的影响。材料：将64颗微螺钉植入8只比格犬的股骨中，其中4颗微螺钉植入1只比格犬的股骨中。分别在微螺钉植入后 0、3、6 和 9 周处死狗。所有样品均准备用于拉拔测试。测量皮质骨厚度。采用方差分析（ANOVA）和Student-Neuman-Keuls（SNK）检验进行统计分析。结果：0周和3周时，厚皮质骨部位的拔出力显着高于薄部位的拔出力。对于厚皮质骨厚度和薄皮质骨厚度部位，0周组中拉拔力最高，3周组中最低。在皮质骨厚度薄的部位，3周组的拔拔力与6周组和9周组有统计学差异；结论：在愈合早期，插入厚皮质骨厚度部位的微型螺钉比插入薄皮质骨厚度部位的微型螺钉具有更好的稳定性。随着愈合时间的延长，差异缩小并变得微不足道。如果将微型螺钉插入皮质骨厚度较薄的部位，可能需要更长的愈合时间。 （角度正交。2011；81：760-766。）
Objective: To compare the effects of different cortical bone thicknesses on the stability of microscrews at different healing times.Materials: Sixty-four microscrews were inserted into the femurs of eight beagles, with four microscrews for one femur of one beagle dog. The dogs were sacrificed at 0, 3, 6, and 9 weeks after microscrew placement, respectively. All specimens were prepared for pullout testing. Cortical bone thickness was measured. Statistical analyses were conducted with analysis of variance (ANOVA) and Student-Neuman-Keuls (SNK) tests.Results: Pullout forces in thick cortical bone sites are significantly higher than those in thin sites at 0 week and 3 weeks. For both thick and thin cortical bone thickness sites, the highest pullout forces were seen in the 0 week group and the lowest in the 3 week group. In the thin cortical bone thickness sites, the pullout force of the 3 week group was statistically different from those of the 6 week group and the 9 week group; however, no such differences were noted in thick cortical bone thickness sites.Conclusion: Microscrews inserted into thick cortical bone thickness sites had better stability than those inserted into thin cortical bone thickness sites at early healing time. The difference diminished and became insignificant as healing time got longer. Longer healing time may be necessary if microscrews are inserted into thin cortical bone thickness sites. (Angle Orthod. 2011;81:760-766.)