反复松紧过程对种植体与基桩结合稳定性的影响

目的探讨在调整TiAdap基桩时,反复松紧过程对种植体和基桩的结合稳定性是否有影响。方法15个Branemark种植体(5RP,5NP,5WP)分别与5个TiAdapRP,5个TiAdaptNP、5个TiAdaptWP组成3组,3组分别用32N.cm、20N.cm、45N.cm扭力将种植体和基桩拧紧,然后再用扭力控制仪将两者松开,记录扭力的数据,重复5次。结果方差分析显示5次拧紧-松开过程记录的扭力第1组无显著性差异(P=0.5319);而第2、3组存在显著性差异(P=0.0084,0.0049),差别主要存在于第1次拧紧-松开过程和后4次松紧之间,后4次松紧过程之间无显著性差异。结论表明反复松紧过程对种植体和基桩结合稳定性的影响主要在第1次松紧过程。

Effects of multiple tightening-loosening of TiAdapt abutment on implant to abutment joint stability

Objective To determine the difference in the implant to abutment joint stability resulting from the preparation procedure in adjusting the TiAddapt abutment. Methods Fifteen Branemark implants (5RP,5NP,5WP) and 5 TiAdapt RP,5 TiAdapt NP and 5 TiAdapt WP abutments formed the experimental populations of 3 groups. The abutments were placed on their respective implant samples and tightened to 32 N·cm,20 N·cm and 45 N·cm for each implant/abutment system. A Tohnichi BTG-6 torque gauge was used to record the force required to loosen the abutment from the implant and the data were recorded. These procedures were repeated 5 times. Results There was no significant difference in group 1 (P= 0.531 9),and there were significant differences in group 2 (P=0.008 4) and group 3 (P=0.004 9) at 0.05 level. The Post-Hoc test demonstrated that there was a significant difference between the first loosening of the retaining screw and the other 4 tightening-loosening sequences in the NP and WP implant/abutments. Conclusion The implant to abutment joint stability was affected by the first tightening-loosening procedure.