Surface texture and composition of titanium brushed with toothpaste slurries of different pHs
Surface texture and composition of titanium brushed with toothpaste slurries of different pHs
复制标题
DOI：
10.1016/j.dental.2006.01.010
复制
发表时间：
2007-02-01
期刊：
影响因子：
5
通讯作者：
Miyakawa, Osamu
中科院分区：
文献类型：
--
作者：
Hossain, Awlad;Okawa, Seigo;Miyakawa, Osamu
目标。这项体外研究表征了用不同 pH 值的牙膏浆刷过的钛的表面纹理和成分，从而阐明了洁齿剂中金属和研磨材料之间的机械化学相互作用。将两种不含氟化物的牙膏（含有结晶 CaHPO4 中心点 2H(2)O 和无定形 SiO2 颗粒作为磨料）与酸性缓冲液混合，得到 pH 6.8 和 4.8 的浆液。样本由 CP Ti 铸造而成，经过镜面抛光，然后在 2.45 N 的负载下以 120 次冲程/分钟的速度用牙刷刷牙 350,400 次。通过 SPM 和 EPMA 来表征样本表面。将获得的数据与已经报道的水稀释碱性浆料的结果进行比较。使用单向方差分析分析每种浆料的 SPM 数据，然后进行事后 Tukey 检验。结果。无论牙膏如何，中性浆料与碱性浆料一样，产生具有粗糙纹理的化学改变表面，而酸性浆料形成具有相对光滑纹理的化学清洁表面。机械化学抛光效果可能是清洁度和光滑度的主要原因。意义重大。酸性浆料引起的光滑表面可以最大限度地减少斑块的形成。然而，释放的钛离子增多可能对人体不利。为了评估牙膏对钛的磨损效果，应考虑牙膏浆液的 pH 值。 (C) 2006 年牙科材料学会。由爱思唯尔有限公司出版。保留所有权利。
Objectives. This in vitro study characterized the surface texture and composition of titanium brushed with toothpaste slurries of different pHs, and thereby elucidated mechanochemical interactions between the metal and abrasive material in dentifrice.Methods. Two fluoride-free toothpastes, which contained crystalline CaHPO4 center dot 2H(2)O and amorphous SiO2 particles as abrasive, were mixed with acidic buffers to provide slurries of pH 6.8 and 4.8. Specimens were cast from CP Ti, mirror-polished, and then toothbrushed at 120 strokes/min for 350,400 strokes under a load of 2.45 N. Specimen surfaces were characterized by means of SPM and EPMA. The obtained data were compared with the already reported results of water-diluted alkaline slurries. SPM data of each paste were analyzed using one-way ANOVA, followed by post hoc Tukey test.Results. Irrespective of toothpaste, neutral slurries, as with alkaline slurries, yielded a chemically altered surface with rough texture, whereas acidic slurries formed a chemically clean surface with relatively smooth texture. Mechanochemical polishing effect might be mainly responsible for the cleanness and smoothness.Significance. Acidic slurry-induced smooth surface may minimize plaque formation. However, the augmentation of released titanium ions may be adverse to the human body. For evaluation of toothpaste abrasion effects on titanium, paste slurry pH should be taken into account. (C) 2006 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.