Purpose: With the observation of bacterial adhesion on the surface of the PFM and enamel, we analyzed the sequence of these adhesions and offer options for prevention of their occurrence.
Methods: The specimen made of PFM were polished step by step. Then they, along with the enamel were put into the liquid BHI culture medium containing Ua, Pg and An. After 6h, 12h and 24h the adhesive microbial amount in the culture medium was determined by counting formation unit. F test was used to analyze the results with SPSS 6.0 software package.
Results: Pg was found neither on the surface of specimen, nor in the liquid BHI culture medium; The value of Ua/An in the groups of PFM was less than that in the groups of enamel within 6 hours. And 12 hours later, the maximal increment of An was seen in the group of PFM. And there was no change in the groups of PFM and enamel during 12 and 24 hours.
Conclusions: Pg was inhibited when these bacteria were cultured together. If we wish to prevent the adhesion of Ua and An, the first 12 hours is the critical period for PFM. Given the result of the analysis, PFM is a good restoration.
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