Magalhães A C, Rios D, Delbem A C B, Buzalaf M A R, Machado M A A M
Bauru School of Dentistry, University of São Paulo, Bauru, Brazil.
Caries Res. 2007;41(1):77-9. doi: 10.1159/000096110.
This in situ/ex vivo study assessed the effect of fluoride dentifrice on eroded enamel subjected to brushing abrasion. In a crossover study performed in 2 phases, 10 volunteers wore acrylic palatal appliances, each containing 3 human enamel blocks. Dentifrice was used to brush the volunteers' teeth and the specimens subjected to abrasion. In phases A and B the dentifrices used had the same formulation, except for the absence or presence of fluoride, respectively. The blocks were subjected to erosion by immersion of the appliances in a cola drink for 5 min, 4 times a day. Then the blocks were brushed, and the appliance was replaced into the mouth. Enamel alterations were determined using profilometry and percentage change in surface microhardness (%SMHC) tests. The data were tested using the paired t test. The mean wear values (+/-SD, microm) were: group A 6.84 +/- 1.72 and group B 5.38 +/- 1.21 (p = 0.04). The mean %SMHC values (+/-SD) were: group A 54.6 +/- 16.2 and group B 45.7 +/- 6.8 (p = 0.04). Fluoride dentifrice had a protective effect on eroded enamel subjected to brushing abrasion.
这项原位/离体研究评估了含氟牙膏对遭受刷牙磨损的侵蚀牙釉质的影响。在一项分两个阶段进行的交叉研究中，10名志愿者佩戴丙烯酸腭部矫治器，每个矫治器包含3个人类牙釉质块。使用牙膏刷牙，并对标本进行磨损处理。在A阶段和B阶段，所使用的牙膏配方相同，只是分别不含氟或含氟。通过将矫治器浸泡在可乐饮料中5分钟，每天4次，使牙釉质块受到侵蚀。然后对牙釉质块进行刷牙处理，并将矫治器放回口中。使用轮廓仪和表面显微硬度百分比变化（%SMHC）测试来确定牙釉质的改变情况。数据采用配对t检验进行分析。平均磨损值（±标准差，微米）为：A组6.84±1.72，B组5.38±1.21（p = 0.04）。平均%SMHC值（±标准差）为：A组54.6±16.2，B组45.7±6.8（p = 0.04）。含氟牙膏对遭受刷牙磨损的侵蚀牙釉质具有保护作用。
