Abstract:

Abstract:Objective To investigate the changes of nickel and chromium contents in gingival tissue and gingival crevicular fluid (GCF) after porcelain-fused-to-nichrome crown restoration and provide a reference for the choosing of materials.Methods The patients who needed partial gingival excision with hyperplasia gingival after porcelain-fused-to-nichrome crown restoration were selected as test group. The patients without any restoration in mouth whose wisdom teeth needed to be removed were selected as control group. Whatman 3# strip filter paper was usedto collect GCF,and excised gingival was collected. The content changes of nickel and chromium in gingival tissue and GCF were detected by inductively coupled plasma mass spectrometry (ICP-MS). Results The contents of nickel and chromium in gingival tissue and GCF in test group were higher than those in control group,andthe content of chromium in GCF in test group was significantly higher than that in control group (P<0.05),but there was no significant difference in nickel content between test and control groups (P>0.05). Conclusion The contents of nickel and chromium in gingival tissue and GCF have an increasing tendency after porcelain-fused-to-nichrome crown restoration,and they have an effect on gingival tissue.

Key words: gingival;gingival crevicular fluid;porcelain-fused-to-nichrome crown;inductively coupled plasma mass spectrometry