The effects of the degradation of mucin by Streptococci on the mechanism of oral malodor

对口臭患者唾液β -半乳糖苷酶活性进行测定，并比较牙周健康组和牙周炎组的唾液β -半乳糖苷酶活性。牙周健康组的-半乳糖苷酶活性与口腔异味水平呈正相关。在临床参数方面，牙周健康组牙菌斑指数、舌苔评分与β -半乳糖苷酶活性呈正相关。接下来，研究了表现出较高和较低恶臭的唾液的细菌组成，以确定与口腔恶臭相关的特定微生物群落。此外，测定了与高硫化氢和甲基硫醇生产有关的口腔微生物群的组成。舌苔是口腔异味的主要来源，因此测定了舌苔的β -半乳糖苷酶活性。

Salivary beta-galactosidase activity from the patients complaining of halitosis was measured and compared between the periodontally healthy group and the periodontitis group. Positive correlations were observed between the beta-galactosidase activity and oral malodor levels in the periodontally healthy group. Concerning the clinical parameter, the plaque index and tongue coating score were positively correlated with beta-galactosidase activity in the periodontal healthy group. Next, the bacterial compositions of saliva exhibiting higher and lower malodor were explored in order to determine the specific microbial community related to oral malodor. In addition, the compositions of oral microbiota associated with high hydrogen sulfide and methyl mercaptan production were determined. Tongue coating is main sources of oral malodor, and therefore the beta-galactosidase activity of tongue coating was measured.