Effect of three different PFM materials on the level of AST and ALP in gingival crevicular fluid

Objective:To investigate the effect of different inner crown materials on periodontal tissue by means of measuring the amount level of AST and ALP in gingival crevicular fluid(GCF)after PFM restoration.Methods:The anterior teeth of 26 patients by random were restored by Ni-Cr alloy PFM,Ti alloy PFM and Au-Pt alloy PFM.GCF was collected from labial and lingual of mesial site and distal site before the tooth preparation by filter paper.At the point of 1 month and 3 months after cementation,GCF was collected at the same sites.The level of AST and ALP were detected by automated chemical analyzer,and analyzed the variation between the pre-restoration and post-restoration.Results:Compared to pre-restoration,all indexes have no conspicuous difference among three groups after 1 month;Ni-Cr alloy group have no difference with Ti alloy group after 3 months.However,Au-Pt alloy group has conspicuous difference with Ni-Cr alloy group and Ti alloy group respectively.Conclusion:Non-noble metal has badnon-favorable effect on the periodontal tissue.It canis easily and correctly to observe the effect of periodontal tissue dynamicallyin the dynamic state after PFM restoration by means of measuring the amount of AST and ALP in GCF.