1. 1) Löe H, Theilade E, Jensen SB: Experimental gingivitis in man. J Periodontol, 36: 177-187, 1965.
2. 2) O'Leary TJ, Drake RB, Naylor JE: The plaque control record. J Periodontol, 43: 38, 1972.
3. 19) Leonard HJ: Is massage a valuable treatment in gingivitis and periodontitis? J Periodontol, 13: 709-713, 1986.
4. 25) Williams KB, Charlos MC, Taylor HJ, Brown AR, Bray KK: Effect of sonic and mechanical toothbrushes on subgingival microbial flora: a comparative in vivo scanning electron microscopy study of 8 subjects. Quintessence Int, 32: 147-154, 2001.
5. 27) Davis WB: Cleaning and polishing of teeth by brushing. Community Dent. Oral Epidemiol, 8 (5): 237-243, 1980.