新型钴铬合金与高金合金边缘适合性和金瓷结合强度的比较

背景：钴铬合金不含镍和铍等有害元素,且增加了钼和硅的含量,被认为适宜烤瓷使用,但关于其边缘适合性和金瓷结合性能等方面均未见相关报道。目的：比较高金合金和新型钴铬合金烤瓷冠边缘适合性和金瓷的结合强度。方法：金瓷冠预备体可卸代型24个,分为两组,一组为高金合金组,一组为新型钴铬合金组,分别制作金合金和新型钴铬合金基底烤瓷冠各12个,羧酸锌水门汀黏固。应用体式显微镜测量边缘浮出量,后将样本置于自制套管内,采用万能拉伸实验机测量崩瓷时的载荷力值。结果与结论：高金合金组唇侧边缘间隙、舌侧间隙均稍高于新型钴铬合金组,但差异均无显著性意义（P〉0.05）,崩瓷时的载荷力值稍低于新型钴铬合金组,但差异无显著性意义（P〉0.05）。说明从边缘适合性和金瓷结合角度来看,新型钴铬合金较适合烤瓷用。

Marginal fitness and metal-ceramic bonding strength of new CoCr alloy versus high gold alloy

BACKGROUND：CoCr alloy,which does not include Ni or Be but contains Mo and Si,is considered appropriate to make porcelain fused to metal crown.There is no report on its marginal fitness and metal-ceramic bonding strength.OBJECTIVE：To compare the marginal fitness and metal-ceramic bonding strength of metal-ceramic crowns with high gold alloy and new CoCr alloy.METHODS：A total of 24 removable die were divided into two groups：high gold alloy group and new CoCr alloy group to prepare into 12 metal-ceramic crowns,respectively.Crowns were cemented by zinc polycarboxylate cement.The marginal fit was investigated by microscope after cementation.And the specimens cemented were subjected to Instron testing machine,which were placed into home-made pipes.The loads at fracture were recorded.RESULTS AND CONCLUSION：The buccal and lingual marginal discrepancies of new CoCr alloy group were lower than high gold alloy group,but there was no statistical difference（P 0.05）.The metal-ceramic bonding strength of new CoCr alloy group was higher than that of high gold alloy group.There was no statistical difference（P 0.05）.Results indicated that new CoCr alloy matched to metal-ceramic crown.