Samuel S M, Rubinstein C
Department of Dentistry, Faculty of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
Braz Dent J. 2001;12(1):35-8.
Demineralization caused by frequent ion loss can be detected by a decrease in enamel microhardness. The purpose of this study was to determine the microhardness of the enamel adjacent to restorations with fluoride and non-fluoride dental materials after demineralization and remineralization treatments using crowns of 6 recently extracted unerupted third molars which were sectioned into 4 parts. Five penetrations were made in the enamel of the control group and in the enamel adjacent to restorations made with Vitremer, Heliomolar or Z100, to obtain the Knoop microhardness. There was no significant statistical difference between the microhardness of the enamel of the control group and the enamel adjacent to the restorations made with Vitremer and Heliomolar (p < 0.01), nor between the enamel adjacent to the Heliomolar and Z100 restorations. However, there was a statistically significant difference when the Z100 group was compared to the control group and to the Vitremer group. The results point out that some phenomena occurred which interferred with the ionic loss and, consequently, the microhardness of the enamel of the Vitremer and Heliomolar groups, because it was not possible to observe any difference between the microhardness of the enamel of the control group and the groups restored with Vitremer and Heliomolar.
频繁的离子流失所导致的脱矿可通过牙釉质显微硬度的降低来检测。本研究的目的是，使用6颗近期拔除的未萌出第三磨牙的牙冠，将其切成4部分，在进行脱矿和再矿化处理后，测定使用含氟和不含氟牙科材料修复的牙齿相邻牙釉质的显微硬度。在对照组的牙釉质以及用Vitremer、Heliomolar或Z100材料修复的牙齿相邻牙釉质上进行5次压痕，以获得努氏显微硬度。对照组牙釉质的显微硬度与用Vitremer和Heliomolar修复的牙齿相邻牙釉质的显微硬度之间无显著统计学差异（p < 0.01），Heliomolar修复组和Z100修复组相邻牙釉质的显微硬度之间也无显著差异。然而，当将Z100组与对照组以及Vitremer组进行比较时，存在统计学上的显著差异。结果表明，发生了一些干扰离子流失的现象，进而影响了Vitremer组和Heliomolar组牙釉质的显微硬度，因为在对照组牙釉质与用Vitremer和Heliomolar修复的组之间未观察到任何差异。
