Chen Ker-Kong, Wu Ju-Hui, Wei Shin-I, Du Je-Kang
Department of Endodontics and Operative Dentistry, Kaohsiung Medical University Hospital and College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
Graduate Institute of Dental Sciences, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
J Dent Sci. 2019 Dec;14(4):419-425. doi: 10.1016/j.jds.2019.09.007. Epub 2019 Nov 7.
BACKGROUND/PURPOSE: Electrolyzed water has been identified as an effective disinfectant that could represent as an alternative to sodium hypochlorite. Unfortunately, it remains unclear whether the texture or physical properties of dentin are affected by the application of electrolyzed water of different acidities. This study was aimed to assess the influence of electrolyzed waters with differing pHs on the demineralizing of inner dentin.
The coronal superficial dentin of 20 human molars was exposed and further bisected into two pieces perpendicular to the dentin surface. The samples were immersed in strongly acidic electrolyzed water (AW group), neutral electrolyzed water (NW group), 5% sodium hypochlorite (positive control, NL group), or deionized water (negative control, DW group). Microhardness of the inner layer dentin was measured at a depth of 25 and 50 μm beneath the superficial surface layer every 5 up to 60 min.
At a depth of 25 μm, microhardness decreased with increasing immersion time in all but the DW group. The AW group exhibited a decreasing trend from the first 5 min that became significant after 35 min of immersion and was the most rapid decrease in the four groups. The rate of decline in the NW group was low and similar to that of the NL group. Both NW and NL groups exhibited significantly less demineralization than the AW group after 15 min of immersion. No significant microhardness change was found at a depth of 50 μm in any of the samples.
AW produces a more pronounced softening of dentin than NW at a depth of 25 μm.
背景/目的：电解水已被确认为一种有效的消毒剂，可作为次氯酸钠的替代品。不幸的是，目前尚不清楚不同酸度的电解水应用是否会影响牙本质的质地或物理性能。本研究旨在评估不同pH值的电解水对牙本质内层脱矿的影响。
暴露20颗人类磨牙的冠部表层牙本质，并将其垂直于牙本质表面进一步切成两片。将样本浸入强酸性电解水（AW组）、中性电解水（NW组）、5%次氯酸钠（阳性对照，NL组）或去离子水（阴性对照，DW组）中。每隔5分钟直至60分钟，在表层下方25和50μm深度处测量内层牙本质的显微硬度。
在25μm深度处，除DW组外，所有组的显微硬度均随浸泡时间增加而降低。AW组从最初5分钟就呈现下降趋势，浸泡35分钟后变得显著，且是四组中下降最快的。NW组的下降速率较低，与NL组相似。浸泡15分钟后，NW组和NL组的脱矿程度均显著低于AW组。在任何样本的50μm深度处均未发现显著的显微硬度变化。
在25μm深度处，AW比NW使牙本质软化更明显。
