Macgregor I D, Rugg-Gunn A J
Community Dent Oral Epidemiol. 1986 Dec;14(6):320-2. doi: 10.1111/j.1600-0528.1986.tb01082.x.
Video recordings were obtained of 90 adults aged 18-22 yr brushing their teeth. Thirty subjects were unaware they were being filmed and 60 subjects had been informed that they would be filmed while they brushed their teeth. From repeated viewing of the tapes the areas of the mouth that were brushed, the total brushing time and the proportion of time spent brushing each of 16 areas of the mouth were obtained for each subject. Subjects who knew they were being filmed brushed significantly more mandibular occlusal surfaces, and lingual areas in both arches than subjects who were unaware they were being filmed. There was no significant difference in the mean toothbrushing time between the two groups. The informed group spent proportionally less time brushing posterior buccal areas and more time on occlusal and lingual areas than the group who were unaware they were being filmed, the difference being statistically significant for the mandibular arch areas. It was concluded that knowledge of filming alters toothbrushing behaviour to a small extent so that care should be taken when interpreting behavioural changes in future intervention studies.
对90名年龄在18至22岁的成年人刷牙过程进行了录像。其中30名受试者不知道自己正在被拍摄，60名受试者被告知他们刷牙时会被拍摄。通过反复观看录像带，获取了每个受试者刷牙的口腔区域、总刷牙时间以及刷牙时花费在口腔16个区域中每个区域的时间比例。知道自己正在被拍摄的受试者比不知道自己正在被拍摄的受试者刷下颌咬合面以及双侧牙弓舌侧区域的次数明显更多。两组之间的平均刷牙时间没有显著差异。与不知道自己正在被拍摄的组相比，被告知的组花费在颊侧后牙区域刷牙的时间比例较小，而在咬合面和舌侧区域花费的时间较多，下颌牙弓区域的差异具有统计学意义。研究得出结论，知道被拍摄会在一定程度上改变刷牙行为，因此在未来的干预研究中解释行为变化时应谨慎。
