Fig. 6

Comparisons of the phylogenetic structure and composition among the plaque microbial communities from four groups. Relative abundance in the levels of phylum (Fig. 6a), genus (Fig. 6b) among the four groups. Relative abundance screening of major species for plaque microbial communities with Wilcoxon rank-sum test between RC-HD and RC-SS groups. Top floras in the level of genus (Fig. 6c, d) and species (Fig. 6e, f). At the level of species, Veillonella dispar is higher in group RC-HD (* P < 0.05, ** P < 0.01)