Van der Weijden G A, Timmerman M F, Danser M M, Van der Velden U
Department of Periodontology, Academic Centre for Dentistry Amsterdam, ACTA, The Netherlands.
J Clin Periodontol. 1998 May;25(5):413-6. doi: 10.1111/j.1600-051x.1998.tb02464.x.
This survey investigated the association between the efficacy of plaque removal and toothbrushing forces during a normal brushing regime. The 94 subjects participating in this study were requested not to brush 24 h prior to the experiment. Panelists brushed for 1 min with a manual toothbrush. Before and after brushing, plaque was assessed using the Turesky modification of the Quigley & Hein plaque index. A second 1-min exercise of brushing was carried out to assess the toothbrushing force. The mean plaque reduction was 39%, with vestibular surfaces being cleaned most effective (69%) and the lingual surfaces the least (21%). The mean brushing force was 330 g. No correlation was observed between efficacy and brushing force (r=0.14, p=0.16). The relationship between pre- and post-brushing plaque was stronger (r=0.68, p<0.001). Multiple regression analysis entering squared values of force as an independent variable into the equation, indicated that the relation between efficacy and force was not linear. A curve could be fitted to the plot (p=0.0004), demonstrating that up to a certain level of force, an increase of force is associated with an increase in efficacy (r=0.33, p<0.01). Beyond this point, application of higher forces resulted in reduced efficacy (r=-0.49, p=0.03). As was calculated in this particular test this 'transition' level of force was 407.4 g. The absence of a correlation between brushing force and plaque removal efficacy suggests that in a 'user model' brushing situation, other factors than brushing force are of major influence on the amount of plaque removed.
本调查研究了在正常刷牙过程中，牙菌斑清除效果与刷牙力度之间的关联。参与本研究的94名受试者被要求在实验前24小时内不刷牙。小组成员使用手动牙刷刷牙1分钟。刷牙前后，使用Quigley & Hein菌斑指数的Turesky改良版评估牙菌斑。进行第二次1分钟的刷牙操作以评估刷牙力度。牙菌斑平均减少了39%，其中前庭面清洁效果最佳（69%），舌面最差（21%）。平均刷牙力度为330克。未观察到效果与刷牙力度之间的相关性（r = 0.14，p = 0.16）。刷牙前后牙菌斑之间的关系更强（r = 0.68，p < 0.001）。将力度的平方值作为自变量纳入方程的多元回归分析表明，效果与力度之间的关系不是线性的。可以拟合一条曲线（p = 0.0004），表明在一定力度水平之前，力度增加与效果增加相关（r = 0.33，p < 0.01）。超过这一点，施加更高的力度会导致效果降低（r = -0.49，p = 0.03）。在这个特定测试中计算得出，这个“转变”力度水平为407.4克。刷牙力度与牙菌斑清除效果之间缺乏相关性表明，在“用户模式”刷牙情况下，除刷牙力度外的其他因素对牙菌斑清除量有主要影响。
