ITI种植体早期负重与传统负重稳定性的比较

目的：应用共振频率分析评价早期负重种植体的稳定性，为种植体早期负重的可行性提供客观依据。方法：50例牙列缺损患者共植入104颗ITISLA表面实心螺纹种植体，随机分为2组，实验组为早期负重组，于术后6周修复；对照组为无负重组，于术后12周修复。在种植体植入术后当天、1周、4周、6周、8周、12周使用无线共振频率分析仪（Osstell Mentor）测定2组种植体的稳定性，所得参数为种植体稳定值（ISO）。采用Minitab统计软件对数据进行t检验．得出各时段2组ISQ值的P值。结果：术后12周，2组种植体的留存率均为100％，2组种植体在各时间段的ISQ值均无显著差异（P〉0．05），整体变化趋势相同：表现为初期稳定性均较高，于第1周至第4周下降，第6周逐步上升，其后稳定性基本保持不变或略有上升。随访期（修复后6个月）间，2组种植体的留存率均为100％。结论：ITISLA表面种植体早期负载是可行的。

Comparison of the stability between early-loaded and conventionally-loaded ITI implants

PURPOSE: To evaluate the feasibility of early implant loading by observation of the implant stability of early-loaded ITI implants using resonance frequency analysis (RFA). METHODS: 104 ITI SLA implants in 50 patients were randomly divided into 2 groups according to different loading time. In the experimental group, plants were loaded 6 weeks after surgery; in the control group, implants were loaded 12 weeks after installation. RFA was taken at 0,1,4,6,8,12 weeks after surgery for implants in both groups to get ISQ(implant stability quotient) values.Student's t test was used to calculate P values for ISQ at all time points by Minitab Release 14.13. RESULTS: No implant failed within the 12 weeks. No significant difference in ISQ values was found between the two groups at all time points(P>0.05).The 2 groups had the same changing mode of ISQ: a relatively high primary stability, a decrease from 1 to 4 weeks, a consequent increase after 6 weeks and a relative stability or a slight increase afterwards. The survival rate for both group during the 6 months follow-up is 100%. CONCLUSIONS: Early loading of ITI SLA implant should be predictable.