Abstract:

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 ergograph. 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 de - crease 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.

Key words: Ni-Cr alloy, gilt, complete metal crown, retention