Pathogen of root surface caries in the elderly

Objective To study the pathogen of root surface caries in the elderly. Methods Plaque samples from the experimental group and the control group we re collected. After culturing in selective and non-selective media, the dif ferent bacteria were isolated. The counts and the positive rates of total b acteria, porphyromonas group, pervotella group, streptococcus mutants group , actinomyces group and lactobacillus group were compared. Results The counts of total bacteria, streptococcus mutants, actinomyces an d lactobacillus of the experimental group were higher than those of the con trol group. The positive rates of actinomyces and lactobacillus of the expe rimental group were significantly higher than those of the control group. Conclusion Actinomyces and lactobacillus are the main related pathogens of root surface caries in the elderly.