3Yoshida M. Correlation belween clinical symptoms and microorgan ismsisolated from root canals of teeth with periapical pathosis [J]. JEndodon, 1987,13-24.
9Lamster lB. Evaluation of components of gingival crevicular fluid as diagnostic test [ J]. J Ann Periodontol, 1997,21 : 123 - 137.
10Batruff JB, Yukna RA, Layman DL, et al. Outer membrane vesicles from Porphyromonas gingivalis affect the growth and function of cultured human gingival fibroblasts and umblical vein endothelial cells [J]. Periodontol,2005,76(6): 972-979.