University of Zürich, Clinic for Preventive Dentistry, Periodontology and Cariology, Zürich, Switzerland. a_aykut@ hotmail.com
J Dent Res. 2013 Mar;92(3):289-94. doi: 10.1177/0022034512473115. Epub 2013 Jan 11.
The objective of this in vitro study was to investigate the effects of viscosity changes of different acidic solutions on dental erosion. Bovine enamel samples (n = 240, Ø = 3 mm) were embedded in acrylic resin and were allocated to 30 groups (n = 8). Citric acid (CA) and phosphoric acid (PA) solutions at pH 2.5, 3, and 3.5 were prepared in de-ionized water (titratable acidity to pH 5.5: 31 ± 0.6 mmol OH(-)/l). The kinetic viscosities of the acidic solutions were adjusted to 1.5, 3, 6, 12, and 24 mm(2)/sec by the addition of hydroxypropyl cellulose (HPC) at different concentrations. Solutions were pumped over the enamel surface from a reservoir with a drop rate of 1 mL/min. Each specimen was eroded for 10 min at 20 °C. Erosion of enamel surfaces was measured by profilometry. Data were analyzed by analyses of variance and logarithmic regression analyses (p < 0.05). Enamel loss was dependent on viscosity, pH, and the kind of acid. The regression analyses showed that higher viscosity caused lower enamel erosion for both acids and all pH levels. Dental erosion is dependent not only on chemical factors of the acid, like pH and acid type, but also on acid viscosity.
本体外研究旨在探究不同酸性溶液黏度变化对牙齿酸蚀的影响。将牛牙釉质样本（n = 240，Ø = 3 mm）嵌入丙烯酸树脂中，并分为 30 组（n = 8）。在去离子水中制备 pH 值为 2.5、3 和 3.5 的柠檬酸（CA）和磷酸（PA）溶液（滴定酸度至 pH 5.5：31 ± 0.6 mmol OH(-)/l）。通过添加不同浓度的羟丙基纤维素（HPC）将酸性溶液的运动黏度调整至 1.5、3、6、12 和 24 mm(2)/sec。溶液以 1 mL/min 的滴落率从储液器中泵送到牙釉质表面。每个标本在 20°C 下腐蚀 10 分钟。通过轮廓仪测量牙釉质表面的腐蚀情况。通过方差分析和对数回归分析（p < 0.05）对数据进行分析。牙釉质的损失取决于黏度、pH 值和酸的种类。回归分析表明，对于两种酸和所有 pH 值，较高的黏度会导致较低的牙釉质腐蚀。牙齿酸蚀不仅取决于酸的化学因素，如 pH 值和酸的类型，还取决于酸的黏度。
