Periodontal disease is caused by bacteria, and bacterialplaque is the initial factor of periodontal disease.
牙周病是细菌感染性疾病,菌斑微生物是牙周病的始动因子。
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RESULTS: in the control group, there were scattered pathogenic bacteria on the teeth surface and bacterialplaque and great deal pathogenic bacteria in the teeth fissure and gingival sulcus.