简短通讯：酸性牙膏磨蚀性的体外评估
Short Communication: In vitro evaluation of the abrasiveness of acidic dentifrices.
作者信息
Alves K M, Pessan J P, Buzalaf M A, Delbem A C
机构信息
Araçatuba Dental School, São Paulo State University and Bauru Dental School, University of São Paulo, Brazil.
出版信息
Eur Arch Paediatr Dent. 2009 Nov;10 Suppl 1:43-5. doi: 10.1007/BF03262700.
AIM
This in vitro study evaluated the abrasiveness of acidic fluoride (F) dentifrices with different F concentrations on bovine enamel.
METHODS
Enamel blocks (4.0 x 4.0 mm2, n=120) were selected according to their surface microhardness and divided into 12 groups. Slurries of dentifrices were used containing 0 (placebo), 275, 412, 550 and 1,100 ppm F (pH 4.5 or 7.0), as well as testing two commercial dentifrices (Crest, positive control, 1,100 ppm F and Colgate Baby, 500 ppm F). Enamel blocks were partially protected with an adhesive tape (control area) and then brushed by an automated toothbrushing machine (16,000 strokes). During this process, 0.4 ml of the slurries were injected every 2 mins on the enamel blocks. After toothbrushing, enamel wear was determined by profilometry.
STATISTICS
Results were analyzed by ANOVA and Tukey's test (p<0.05).
RESULTS
The mean values for pH in the suspensions during treatment were 6.93, 4.32, 7.56 and 8.19 for neutral experimental dentifrices, acidic experimental dentifrices, Crest and Colgate baby, respectively. The abrasiveness of the acidic dentifrices was similar (p<0.05) to the neutral ones, whereas commercial dentifrices yielded lower abrasion (p<0.05).
CONCLUSION
It was concluded that a reduction of the pH of dentifrices does not increase their abrasiveness.
目的
本体外研究评估了不同氟浓度的酸性含氟牙膏对牛牙釉质的磨损性。
方法
根据表面显微硬度选择牙釉质块（4.0×4.0平方毫米，n = 120），并将其分为12组。使用含0（安慰剂）、275、412、550和1100 ppm氟（pH 4.5或7.0）的牙膏浆液，以及测试两种市售牙膏（佳洁士，阳性对照，1100 ppm氟和高露洁儿童牙膏，500 ppm氟）。用胶带对牙釉质块进行部分保护（对照区域），然后用自动牙刷机刷牙（16000次刷动）。在此过程中，每2分钟向牙釉质块上注射0.4毫升浆液。刷牙后，通过轮廓仪测定牙釉质磨损情况。
统计学分析
结果采用方差分析和Tukey检验进行分析（p<0.05）。
结果
治疗期间，中性实验牙膏、酸性实验牙膏、佳洁士和高露洁儿童牙膏悬浮液的pH平均值分别为6.93、4.32、7.56和8.19。酸性牙膏的磨损性与中性牙膏相似（p<0.05），而市售牙膏的磨损性较低（p<0.05）。
结论
得出的结论是，牙膏pH值的降低不会增加其磨损性。
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