Kumar Sandeep, Kumar Singh Siddharth, Gupta Anjali, Roy Sayak, Sareen Mohit, Khajuria Sarang
Dept. of Public Health Dentistry, Sri Aurobindo College of Dentistry, Indore, Madhya Pradesh, India.
Dept. of Oral Medicine and Radiology, Sri Aurobindo College of Dentistry, Indore, India.
J Dent (Shiraz). 2015 Sep;16(3 Suppl):267-73.
Despite of many studies conducted on toothbrushes and toothpaste to find out the culprit for abrasion, there is no clear cut evidence to pin point the real cause for abrasion.
An in vitro assessment of the role of different types of toothbrushes (soft/ medium/hard) in abrasion process when used in conjunction with and without a dentifrice.
Forty five freshly extracted, sound, human incisor teeth were collected for this study. Enamel specimens of approximately 9 mm(2) were prepared by gross trimming of extracted teeth using a lathe machine (Baldor 340 Dental lathe; Ohio, USA). They were mounted on separate acrylic bases. The specimens were divided into three groups, each group containing 15 mounted specimens. Group 1 specimens were brushed with soft toothbrush; Group 2 brushed with medium toothbrush and Group 3 with hard toothbrush. Initially, all the mounted specimens in each group were brushed using dentifrice and then the same procedure was repeated with water as control. Profilometric readings were recorded pre and post to tooth brushing and the differences in readings served as proxy measure to assess surface abrasion. These values were then compared to each other. Kruskal Wallis and Mann-Whitney U test were performed.
The results showed that brushing, with water alone, caused less abrasion than when toothpaste was added (p< 0.008). When brushed with water, the harder toothbrush caused more abrasion (higher Ra-value), but when toothpaste was added, the softer toothbrush caused more abrasion (p< 0.001).
Besides supporting the fact that toothpaste is needed to create a significant abrasion, this study also showed that a softer toothbrush can cause more abrasion than harder ones. The flexibility of bristles is only secondary to abrasion process and abrasivity of dentifrice has an important role in abrasion process.
尽管针对牙刷和牙膏进行了许多研究以找出磨损的元凶，但尚无确凿证据能明确指出磨损的真正原因。
对不同类型（软毛/中毛/硬毛）牙刷在使用牙膏和不使用牙膏时在磨损过程中的作用进行体外评估。
本研究收集了45颗新鲜拔除的、完好的人切牙。使用车床（Baldor 340牙科车床；美国俄亥俄州）对拔除的牙齿进行大体修整，制备出面积约为9平方毫米的牙釉质标本。将它们安装在单独的丙烯酸基底上。标本分为三组，每组包含15个安装好的标本。第1组标本用软毛牙刷刷牙；第2组用中毛牙刷刷牙，第3组用硬毛牙刷刷牙。最初，每组中所有安装好的标本都使用牙膏刷牙，然后以水作为对照重复相同步骤。在刷牙前后记录轮廓测量读数，读数的差异作为评估表面磨损的替代指标。然后将这些值相互比较。进行了Kruskal Wallis检验和Mann-Whitney U检验。
结果表明，仅用水刷牙比添加牙膏时造成的磨损更少（p < 0.008）。用水刷牙时，较硬的牙刷造成的磨损更多（Ra值更高），但添加牙膏时，较软的牙刷造成的磨损更多（p < 0.001）。
除了支持需要牙膏才能造成显著磨损这一事实外，本研究还表明，较软的牙刷比较硬的牙刷可能造成更多磨损。刷毛的柔韧性在磨损过程中只是次要因素，牙膏的磨蚀性在磨损过程中起重要作用。
