Silva Kélio Garcia, Pedrini Denise, Delbem Alberto Carlos Botazzo, Cannon Mark
Department of Pediatric and Social Dentistry, School of Dentistry of Araçatuba, São Paulo State University, Araçatuba, SP, Brazil.
Braz Dent J. 2007;18(4):309-13. doi: 10.1590/s0103-64402007000400007.
This study evaluated the surface microhardness and fluoride release of 5 restorative materials - Ketac-Fil Plus, Vitremer, Fuji II LC, Freedom and Fluorofil - in two storage media: distilled/deionized water and a pH-cycling (pH 4.6). Twelve specimens of each material, were fabricated and the initial surface microhardness (ISM) was determined in a Shimadzu HMV-2000 microhardness tester (static load Knoop). The specimens were submitted to 6- or 18-h cycles in the tested media. The solutions were refreshed at the end of each cycle. All solutions were stored for further analysis. After 15-day storage, the final surface microhardness (FSM) and fluoride release were measured. Fluoride dose was measured with a fluoride-specific electrode (Orion 9609-BN) and digital ion analyzer (Orion 720 A). The variables ISM, FSM and fluoride release were analyzed statistically by analysis of variance and Tukey's test (p<0.05). There was significant difference in FSM between the storage media for Vitremer (pH 4.6 = 40.2 +/- 1.5; water = 42.6 +/- 1.4), Ketac-Fil Plus (pH 4.6 = 73.4 +/- 2.7; water = 58.2 +/- 1.3) and Fluorofil (pH 4.6 = 44.3 +/- 1.8; water = 38.4 +/- 1.0). Ketac-Fil Plus (9.9 +/- 18.0) and Fluorofil (4.4 +/- 1.3) presented higher fluoride release in water, whereas Vitremer (7.4 +/- 7.1), Fuji II LC (5.7 +/- 4.7) and Freedom (2.1 +/- 1.7) had higher fluoride release at pH 4.6. Microhardness and fluoride release of the tested restorative materials varied according to the storage medium.
本研究评估了5种修复材料——Ketac-Fil Plus、Vitremer、Fuji II LC、Freedom和Fluorofil——在两种储存介质（蒸馏水/去离子水和pH循环（pH 4.6））中的表面显微硬度和氟释放情况。每种材料制作12个样本，并在岛津HMV-2000显微硬度测试仪（努氏静态载荷）上测定初始表面显微硬度（ISM）。样本在测试介质中进行6小时或18小时的循环处理。每个循环结束时更换溶液。所有溶液储存起来以备进一步分析。储存15天后，测量最终表面显微硬度（FSM）和氟释放量。使用氟特异性电极（奥立龙9609-BN）和数字离子分析仪（奥立龙720 A）测量氟含量。通过方差分析和Tukey检验（p<0.05）对ISM、FSM和氟释放量等变量进行统计学分析。Vitremer（pH 4.6 = 40.2 +/- 1.5；水 = 42.6 +/- 1.4）、Ketac-Fil Plus（pH 4.6 = 73.4 +/- 2.7；水 = 58.2 +/- 1.3）和Fluorofil（pH 4.6 = 44.3 +/- 1.8；水 = 38.4 +/- 1.0）在不同储存介质中的FSM存在显著差异。Ketac-Fil Plus（9.9 +/- 18.0）和Fluorofil（4.4 +/- 1.3）在水中的氟释放量较高，而Vitremer（7.4 +/- 7.1）、Fuji II LC（5.7 +/- 4.7）和Freedom（2.1 +/- 1.7）在pH 4.6时的氟释放量较高。所测试修复材料的显微硬度和氟释放量因储存介质而异。
