Momoi Y, Hirosaki K, Kohno A, McCabe J F
Department of Operative Dentistry, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
Dent Mater. 1997 Mar;13(2):82-8. doi: 10.1016/s0109-5641(97)80016-4.
This study was conducted to compare the rate of abrasive wear and change in surface roughness of resin-modified and conventional acid-base glass ionomers when subjected to toothbrush-dentifrice abrasion.
Two resin-modified and two conventional glass ionomers were used. Samples of a high-copper amalgam and a hybrid resin composite were used as reference materials. Specimens of each material were prepared and subjected to toothbrush-dentifrice abrasion using 20,000 strokes of brushing. The amount of vertical loss of material was determined by profilometry (Surfcom-4A, Tokyo-Seimitsu, Tokyo, Japan). The surface characteristics after abrasion were evaluated on secondary electron images by SEM, and the surface hardness (KHN) was also measured for all materials. Data were analyzed by one-way ANOVA (p < 0.05), followed by a multiple comparisons test using LSD (Least-significant difference) at a level of p < 0.05.
The abrasion resistance of resin-modified glass-ionomers was statistically lower for the amalgam and the resin composite reference materials. Statistically lower abrasion resistance and surface hardness were observed for the resin-modified glass ionomers than for their conventional acid-base counterparts when two forms of products from the same manufacturer were compared. SEM observations made after abrasion testing showed a significantly rougher surface for all glass ionomer materials than for the amalgam and the resin composite.
When comparisons were made between products from the same manufacturers, it was found that in vitro resistance to toothbrush-dentifrice abrasion of the resin-modified glass ionomers is inferior to that of the conventional acid-base glass ionomers. The lower abrasion resistance found in the resin-modified products appears to be related to their lower surface hardness.
本研究旨在比较树脂改性型和传统酸碱型玻璃离子水门汀在牙刷-牙膏磨损作用下的磨耗率及表面粗糙度变化。
使用两种树脂改性型和两种传统玻璃离子水门汀。高铜银汞合金和混合树脂复合材料样本用作参考材料。制备每种材料的试件，并使用牙刷进行20000次刷牙动作的牙膏磨损试验。通过轮廓仪（Surfcom-4A，东京精密，东京，日本）测定材料的垂直损失量。通过扫描电子显微镜在二次电子图像上评估磨损后的表面特征，并且还测量了所有材料的表面硬度（努氏硬度）。数据采用单因素方差分析（p<0.05）进行分析，随后使用最小显著差法（LSD）在p<0.05水平进行多重比较检验。
树脂改性型玻璃离子水门汀对于银汞合金和树脂复合材料参考材料的耐磨性在统计学上较低。当比较同一制造商的两种产品形式时，树脂改性型玻璃离子水门汀的耐磨性和表面硬度在统计学上低于其传统酸碱型对应产品。磨损试验后进行的扫描电子显微镜观察显示，所有玻璃离子水门汀材料的表面比银汞合金和树脂复合材料的表面明显更粗糙。
当对同一制造商的产品进行比较时，发现树脂改性型玻璃离子水门汀在体外对牙刷-牙膏磨损的抵抗力低于传统酸碱型玻璃离子水门汀。树脂改性产品中发现的较低耐磨性似乎与其较低的表面硬度有关。
