Turssi C P, Faraoni J J, Rodrigues A L, Serra M C
Department of Restorative Dentistry, School of Dentistry of Piracicaba, State University of Campinas, Brazil.
Caries Res. 2004 Sep-Oct;38(5):473-7. doi: 10.1159/000079629.
This crossover study aimed to investigate abrasion of previously eroded hard dental tissues by a whitening dentifrice compared to a regular dentifrice. After a 3-day lead-in period, 14 volunteers were randomly assigned to use one of the toothpastes while wearing a removable appliance, containing 3 enamel and 3 root dentine slabs on each side. On the first day salivary pellicle was allowed to form. Twice daily for the following 3 days, one side of each appliance was immersed in an acidic carbonated drink ex vivo while the other side remained unexposed. Specimens were then brushed with the allocated dentifrice. After a 3-day washout period, new sets of enamel and dentine slabs were mounted in the appliances and the participants commenced period 2 using the alternative toothpaste. Acid-treated specimens always showed more wear than untreated specimens. The whitening dentifrice did not significantly increase the wear of softened enamel compared with the regular dentifrice. Brushing with the whitening toothpaste led to significantly greater wear of sound enamel and of both eroded and sound dentine than the regular dentifrice. The results suggest that whitening dentifrices may not increase the wear of acid-softened enamel but may have a more deleterious effect on dentine than regular toothpastes.
这项交叉研究旨在调查与普通牙膏相比，美白牙膏对先前已被侵蚀的坚硬牙齿组织的磨损情况。在为期3天的导入期后，14名志愿者被随机分配使用其中一种牙膏，同时佩戴一个可摘矫治器，矫治器两侧各包含3块釉质板和3块牙本质板。第一天让唾液薄膜形成。在接下来的3天里，每天两次，将每个矫治器的一侧在体外浸入酸性碳酸饮料中，而另一侧保持未暴露状态。然后用分配的牙膏刷牙。经过3天的洗脱期后，在矫治器中安装新的一组釉质板和牙本质板，参与者开始使用另一种牙膏进行第2阶段。经过酸处理的标本总是比未处理的标本磨损更严重。与普通牙膏相比，美白牙膏并未显著增加软化釉质的磨损。与普通牙膏相比，使用美白牙膏刷牙导致完好釉质以及侵蚀和完好牙本质的磨损明显更大。结果表明，美白牙膏可能不会增加酸软化釉质的磨损，但可能比普通牙膏对牙本质有更有害的影响。
