Effect of storage media on the fluoride release and surface microhardness of four polyacid-modified composite resins ("compomers")
Effect of storage media on the fluoride release and surface microhardness of four polyacid-modified composite resins ("compomers")
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DOI：
10.1016/s0109-5641(99)00034-2
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发表时间：
1999-05-01
期刊：
影响因子：
5
通讯作者：
Garcia-Godoy, F
中科院分区：
文献类型：
--
作者：
Geurtsen, W;Leyhausen, G;Garcia-Godoy, F
目标.本研究的目的是测量表面显微硬度（维氏硬度）以及在包括一种酯酶缓冲液的各种人工唾液（缓冲液）中储存后从四种聚酸改性的复合树脂（PMC）（“复合体”）（Compoglass F、F 1080、Dyract AP、实验复合体）释放的氟化物。将样品在去离子水、含有猪酯酶的酸性缓冲液I（pH 4.2）、中性缓冲液II（pH 7.0）或中性缓冲液IIT（pH 7.0）中储存6天。每48 h将样品转移到新鲜培养基中，每48 h测量氟释放。在将样品储存在介质中之前（基线）以及在各种溶液中储存24、48和144小时之后，测定每组的每五个样品的维氏硬度。干存标本作为对照，结果。在各种介质中储存后，所有PMC的表面显微硬度显着下降。但无显著差异。在不同介质中储存6天的相同材料的样品之间发现。一般而言，除Dyract AP外，最高量的氟化物释放到酸性缓冲液I中，Dyract AP将类似量的氟化物分离到缓冲液I和去离子水中。更多的氟化物被释放到去离子水中比中性缓冲液。此外，酯酶处理增加了三种PMC的氟释放。我们的研究结果表明，唾液酯酶的行动可能会削弱表面的聚酸改性的复合树脂填料。作为临床结果，磨损可能会增强，并且负载阻力可能会降低。此外，唾液中和酸性条件下的水解酶可增加PMC的氟化物释放。(C)1999年爱思唯尔牙科材料科学院。由Elsevier Science Ltd.出版，版权所有。
Objectives. The aims of this investigation were to measure the surface microhardness (Vickers) as well as the release of fluoride from four polyacid-modified composite resins (PMC) ("compomers") (Compoglass F, F 1080, Dyract AP, experimental compomer) after storage in various artificial saliva (buffers) including one esterase-buffer.Methods. Samples were stored for 6 days in de-ionized water, acidic buffer I (pH 4.2), neutral buffer II (pH 7.0), or neutral buffer IIT (pH 7.0) containing porcine esterase. The specimens were transferred into fresh media every 48 h, Fluoride release was measured every 48 h. Vickers hardness of each five samples of every group was determined before storing the samples in media (baseline) as well as after storage for 24, 48, and 144 h in the various solutions. Dry-stored specimens served as control,Results. The surface microhardness of all PMCs significantly decreased after storage in the various media. No significant differences,, however. were found between samples of the same material stored in the various media for 6 days. In general, the highest fluoride quantity was released into the acidic buffer I except for Dyract AP, which segregated similar quantities of fluoride into buffer I and into de-ionized water. More fluoride was released into de-ionized water than into neutral buffers. Further, esterase treatment increased fluoride release from three PMCs.Significance. Our results suggest that the action of salivary esterases may weaken the surface of polyacid-modified composite resin restorations. As a clinical consequence, wear may be enhanced and load resistance may be reduced. In addition, fluoride release from PMCs may be increased by hydrolytic enzymes in saliva and under acidic conditions. (C) 1999 Elsevier Science Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.