2Lim LP, Davies WI, Yuen KW, et al. Comparison of modes of oral hygiene instruction in improving gingival health J. J Clin Periodontal, 1996,23 (7) : 693 -697.
3Lim LP, Davies WI. Comparison of various modalities of "simple" periodontal therapy on oral cleanliness and bleeding [J]. J Clin Periodontol, 1996,23(6):595-600.
4Lembariti BS, van der Weijden GA, van Palenstein Helderman WH. The effect of a single scaling with or without oral hygiene instruction on gingival bleeding and calculus formation [J]. J Clin Periodontal, 1998,25 ( 1 ) : 30-33.
5Harnacke D, Beldoch M, Bohn GH, et al. Oral and written instruction of oral hygiene: a randomized trial[J]. J Periodontol, 2012,83 (10) : 1206-1212.
6Needleman I, Suvan J, Moles DR, et al. A systematic review of professional mechanical plaque removal for prevention of periodontal diseases [J]. J Clin Periodontol, 2005,32 (Suppl 6) : 229-282.