钴铬合金和陶瓷间粘结强度研究

Research on adhesion stress of Co-Cr metal and GC ceramic

目的 研究GC陶瓷和钴铬合金用不同界面处理方法、不同粘结剂粘结起来的粘结强度,旨在了解金属和陶瓷用何种粘结剂可以满足临床上金属陶瓷可摘局部义齿的需要,同时探讨不同界面处理对二者间粘结强度的影响。方法制作60个金属和陶瓷试样并随机分成4组,分别用玻璃离子,聚羧酸锌,EB树脂粘结,前三组的粘结面都用喷砂处理,第四组陶瓷的粘结面用5％的HF酸处理120s。试样在1.5Kg的压力下粘结后,在37℃的蒸馏水保持36h。记录用材料万能测试仪,切刀以0.5mm／min的速度垂直加力,试样断裂时的载荷值,计算其抗剪力强度。结果第一组的粘结强度是(4.74±1.89)MPa;第二组的是(6.32±1.98)MPa;第三组的是(11.26±3.44)MPa;第四组的是(8.37±3.09)MPa。各组间均数两两比较第一组与第二组间的粘结强度相比,无显著性差异;其它各组间均有显著性差异。测试结果第三组的粘结强度最高,两个最大值16.02MPa和15.96MPa都出现在该组。结论三种粘结剂都可以满足MCRPD制作的需要,其中以EB树脂的粘结强度最高,GC陶瓷用喷砂处理比用5％HF酸处理粘结面粘结强度高。

Objective This in vitro study is attempted to determine the shear bond strength values among three conventional cement and cobalt-chromium frameworks after 4 surface treatments. Methods 60 specimens were fabricated and randomly divided into four groups. Group 1 specimens were sandblasted before cementation with glass ionomer cement to cobalt-chromium rods. Group 2 used zinc polycrylate cement. Group 3 used EB resin cement. Group 4 specimens were treated with 5% hydrofluoric (HF) acid before cementation to sandblasted cobalt-chromium rods. All specimens were subjected to a load of 1.5kg during cementation, then stored in water under 37℃ for 36 hours. A jig mounted on the test machine was used at a crosshead speed of 0.5 mm/min to test the shear bond strengths. Results Statistical analysis showed no significant difference between group 1 and group 2(P>0.05), no significant difference among other groups. The results of shear bond strength test were (4.74±1.89)MPa for group 1, (6.32±1.98)MPa for group 2,(11.26±3.44)MPa for group 3,and (8.37±3.09) Mpa for group 4. Group 3 showed higher bond strengths than those of the others, including the two higher values, 16.02MPa and 15.96 MPa. Conclusion The shear bond strength of three kinds of cement was high e-nough to fabricate MCRPD .The values of EB resin cement were the highest with the GC ceramic sandblasted.