镀金对金属全冠固位力的影响

The influence of gilt to the retention of the complete metal crown

目的探讨镀金技术对非贵金属全冠固位力的影响。方法将60个镍铬合金全冠随机分为3组,每组20个。对照组喷砂后不作处理,部分镀金组在内冠颈缘1.3mm范围内镀金,全冠镀金组的内冠全部镀金。将全冠用玻璃离子与底座黏固后,在Instron万能材料力学实验机上测量固位力,对3组之间的固位力进行统计分析。结果对照组、部分镀金组、全冠镀金组的固位力分别为(657±151)N、(632±139)N、(569±103)N。对照组与全冠镀金组、全冠镀金组与部分镀金组固位力之间的差异有统计学意义(P<0.05),而对照组与部分镀金组固位力之间的差异无统计学意义(P>0.05)。结论镍铬合金全冠镀金后固位力会有所下降,但仍能满足临床上的固位要求。部分镀金全冠固位力虽有所下降,但可忽略不计。

Objective To research the influence of gilt to the retention of the complete metal crown. Methods Sixty Ni-Cr alloy complete metal crown were divided into three groups, control group （common Ni-Cr alloy complete metal crown）, whole gold-plating group （whole gilding on the tissue surface of the inner Ni-Cr alloy complete metal crown）, partial gold-plating group （gilding on the tissue surface of 1/3 cervical inner Ni-Cr alloy complete metal crown）. The retention force of complete metal crown was measured by tensile force/pressure ergograpb. Results The retention force of control group, partial gold-plating group, whole gold-plating group were （657± 151） N, （632±139） N, （569±103） N, respectively. There were significant differences between control group and whole goldplating group, whole gold-plating group and partial gold-plating group （P〈0.05）. There was no significant difference between control group and partial gold-plating group （P〉0.05）. Conclusion The force of retention would decrease after gilding on the tissue surface of the inner Ni-Cr alloy complete metal crown, but have no influence to normal retention requirement of complete crown. Although the retention of partial gold-plating complete metal crown had somewhat decrease, it could be ignored.