Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dentistry, Sapporo, Japan.
Laboratory of Integrated Functional Materials, Center for Advanced Research of Energy and Materials, Hokkaido University, Faculty of Engineering, Sapporo, Japan.
Dent Mater. 2021 Jan;37(1):106-112. doi: 10.1016/j.dental.2020.10.016. Epub 2020 Nov 21.
The purpose of this study was to determine the bond stability and the change in interfacial ultra-structure of a conventional glass-ionomer cement bonded to dentin, with and without pre-treatment using a polyalkenoic acid conditioner.
The occlusal dentin surfaces of six teeth were ground flat. Glass-ionomer cement was bonded to the surfaces either with or without polyalkenoic acid conditioning. The teeth were sectioned into 1-mm stick-shaped specimens. The specimens obtained were randomly assigned to two groups with different periods of storage in water: 1 week and 1 year. The micro-tensile bond strength (μTBS) was determined for each storage time. Additional specimens were prepared for Transmission Electron Microscopy (TEM); they were produced with or without prior polyalkenoic acid conditioning in the same way as in the μTBS test.
There was no significant difference in μTBS to conditioned dentin and non-conditioned dentin (p > 0.05). The failures appeared to be of a mixed nature, although aging caused more areas of cohesive than adhesive failure in both groups. The TEM observation showed an intermediate layer, a matrix-rich layer and a partially demineralized layer in the polyalkenoic acid conditioned group.
Aging did not reduce the bond strength of the conventional glass-ionomer cement to dentin with or without the use of a polyalkenoic acid conditioner.
本研究旨在确定传统玻璃离子水门汀与牙本质粘结后的粘结稳定性及其界面超微结构的变化，分别有无聚烯酸处理剂预处理。
六颗牙齿的咬合面牙本质被磨平。玻璃离子水门汀分别在有和没有聚烯酸处理剂的情况下粘结到表面。将牙齿切成 1mm 棒状标本。从每个储存时间随机获得的标本被分为两组，分别在水中储存 1 周和 1 年。对于每个储存时间，均测定微拉伸粘结强度（μTBS）。还准备了额外的标本进行透射电子显微镜（TEM）观察；以与 μTBS 测试相同的方式，在有和没有预先使用聚烯酸处理剂的情况下制备标本。
在有条件的牙本质和无条件的牙本质之间，μTBS 没有显著差异（p>0.05）。尽管老化导致两组中更多的粘聚性失效而不是粘着力失效，但失效似乎是混合性质的。TEM 观察显示，在聚烯酸处理组中存在中间层、富含基质层和部分脱矿层。
无论是否使用聚烯酸处理剂，老化均不会降低传统玻璃离子水门汀与牙本质的粘结强度。
