Wu Jing, Bai Yu-xing, Wang Bang-kang, Gao Xiao-hui
Department of Orthodontics, Faculty of Stomatology, Capital University of Medical Sciences, Beijing 100050, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2006 Apr;41(4):226-7.
To evaluate the stability of mini-screw implant during different healing periods in the unloaded conditions.
Sixty titanium mini-screws were used in this study. A total of 10 New Zealand white rabbits were randomly divided into 5 groups according to different healing periods. The stability was evaluated biomechanically at different time points. One-way ANOVA and correlation analyses were used.
(1) After 4 weeks and 8 weeks of healing, maximal pull-out loads were (179.68 +/- 24.65) N and (212.06 +/- 42.51) N, respectively. The maximal torques were (0.47 +/- 0.13) N.m and (0.61 +/- 0.16) N.m, respectively. (2) Significant difference in maximal torque was found between 4 week and 8 week healing groups. (3) Both reverse torque and pull-out load significantly correlated with healing time.
Fourth-week is a critical time point in the progress of osseointegration. Within 8 weeks of healing process, the stability of implant was significantly correlated with healing time.
评估在无负载条件下，微型螺钉种植体在不同愈合期的稳定性。
本研究使用了60颗钛制微型螺钉。根据不同愈合期，将10只新西兰白兔随机分为5组。在不同时间点对稳定性进行生物力学评估。采用单因素方差分析和相关性分析。
（1）愈合4周和8周后，最大拔出力分别为（179.68±24.65）N和（212.06±42.51）N。最大扭矩分别为（0.47±0.13）N·m和（0.61±0.16）N·m。（2）4周愈合组和8周愈合组之间的最大扭矩存在显著差异。（3）反向扭矩和拔出力均与愈合时间显著相关。
第4周是骨结合过程中的关键时间点。在愈合过程的8周内，种植体的稳定性与愈合时间显著相关。
