![]() ![]() ![]() This might have also reduced the “How thorne effect?,” that is, the patients brush more consciously on the day of recall.In a short-term clinical study, many different factors such as duration of toothbrushing, manual dexterity, motivation, frequency of toothbrushing, technique and thoroughness of toothbrushing, type of dentifrice (Colgate Total ®) being used, regularity and punctuality of follow-up appointments, and “novelty-effects” may interfere with results. Heasman and Mc Craken considered split-mouth study of greatest value for evaluation of plaque-removing efficacy, especially for powered toothbrushes.One problem in the design of short-term brushing studies is that the amount of plaque to be removed may decrease in the course of study due to motivation and brushing experiences., To avoid such problems, we chose to use a standardized period of at least 24 hours of plaque accumulation before each recall visit. Cavitation and acoustic streamingUse of devices with ionic action in the oral cavity is not a new concept. Also, for the time intervals 15-30 days and 30-45 days, the difference in P values ( P value - 0.15 and P value - 0.61, respectively) was found to be statistically nonsignificant. The difference in P values ( P value - 0.72, P value - 0.67, and P value - 1.00, for 15 th, 30 th, 45 th days respectively) was found to be statistically nonsignificant. Gingival bleeding indexAs shown in, reduction in GBI was more in case of sonic toothbrushes at the end of the study (45 th day), while, the ionic toothbrushes showed more reduction on 15 th and 30 th day. ![]() On intergroup comparison, the difference in P values ( P value - 0.37, P value - 0.37, P value - 0.53, P value - 0.92, and P value - 0.18, respectively) was found to be statistically nonsignificant for 0-15 th, 0-30 th, 0-45 th, 15 th-30 th, 30 th-45 th day intervals. Though the sonic toothbrush was better in result on 15 th day and at the end of study, the ionic toothbrush showed more reduction on 30 th day. ![]()
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