Holm-Pedersen P, Folke L E, Gawronski T H
J Dent Res. 1980 May;59(5):771-6. doi: 10.1177/00220345800590050401.
The composition and biochemical activities of 4- and 9-day-old plaque were studied in young and elderly subjects. Plaque accumulation tended to be greater in the older group. Levan hydrolase activity and the total number of recoverable, viable microorganisms were higher in plaque from younger subjects. Results suggest that the microbial composition of plaque is qualitatively different in younger and elderly subjects.
在年轻和老年受试者中研究了4天和9天菌斑的组成及生化活性。老年组的菌斑积累往往更多。年轻受试者菌斑中的果聚糖水解酶活性及可培养的活微生物总数更高。结果表明，年轻和老年受试者菌斑的微生物组成在质量上有所不同。
