Abstract
Culture method was used to survey the microflora in supragingival marginal plaque formed on the full cast crown fabricated with platinum gold cast alloy. A band of plaque approximately two millimeters coronal to marginal gingiva in buccal surface was collected from tooth (control group) and full cast crown (experimental group) fabricated with platinum gold cast alloy in mandibular first molar in each subject.The resuls indicated that there was no difference in the bacterial composition, but that there was a difference in the bacterial proportion between two groups. Experimental group had a significantly higher level of Streptococcus and a lower level of Actinomyces and Veillonella in the microbial proportion than control group. But experimental group had not significantly higher level of Streptococcus in the viable counts per wet weight of plaque than control group. This study suggested that physico-chemical properties had the influence upon the microbial ecology in the process of the plaque formation.
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