7Pizzo G, La Cara M, Conti Nibali M, et al. Periodontitis and preterm delivery. A review of the literature[J]. Minerva Stomatol, 2005, 54(12): 1-14.
8Lopez N J, Simth PC, Gutierrez J. Periodontal therapy may reduce the risk of preterm low birth weight in women with periodontal disease: a randomized controlled trial[J]. J Periodontol, 2002, 73 (8): 9-11.
9L6pez N J, Smith P C, Gutierrez J. Periodontal therapy may reduce the risk of preterm low birth weight in women with periodontal disease: a randomized controlled trial E J 1. J Periodontol,2002,73(8) :911 924.
10Buischi YAP, Axelsson P, Mayer MPA, et al. Effcet of two preventive programs on oral heath knowledge and habits among Brazilian school children J . Community Dentistry and Oral Epidemiology, 1994, 22 (1) : 41.