Abstract
At Nippon Dental University, there are students enrolled in” “Research for Life Dental Science,”which practices research and investigation. Out of all the students, a lecture about research was delivered to seven second grade students of the life department of dentistry assigned to the periodontics domain. The “Effect of Dentifrice on Plaque Formation” was decoded as the subject of the research, and the plaque-inhibiting effect of a cosmetic dentifrice and an unregulated drug dentifrice (CPC combination) was compared in the first half (April-September, 2011) ― it was a randomized controlled study (Research 1). The results revealed no difference between the two dentifrices. After discussing the result, the protocol was corrected and the effect of CPC containing mouth rinse was compared with a placebo in the second half (October, 2011- January, 2012) on the “The Effect of Mouth Rinse on Plaque Formation”― this was also a randomized controlled study (Research 2). The results revealed a significant plaque-inhibiting effect of CPC containing mouth rinse. After a thorough discussion of the limitations of Research 1, some improvements were suggested, and, it was thought that the results of Research 2 was improved as a result of raising the quality of the research. To employ this experience efficiently and to contribute to the development of the quality of future dental care is desired. Nihon Shishubyo Gakkai Kaishi (J Jpn Soc Periodontol) 55(2)：366-370, 2013.
