Hydrolytic stability of experimental hydroxyapatite-filled dental composite materials
Hydrolytic stability of experimental hydroxyapatite-filled dental composite materials
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DOI：
10.1016/s0109-5641(02)00093-3
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发表时间：
2003-09-01
期刊：
影响因子：
5
通讯作者：
Toledano, M
中科院分区：
文献类型：
--
作者：
Domingo, C;Arcís, RW;Toledano, M
目标.本研究的目的是分析在水中的行为，相关的机械性能，实验复合材料的牙科修复。所研究的材料由可见光固化单体混合物（Bis-GMA和TEGDMA或HEMA）和微米、纳米或两种尺寸的羟基磷灰石颗粒的混合物作为增强填料组成。填料颗粒用偶联剂（柠檬酸、氢化琥珀酸、丙烯酸或甲基丙烯酸或硅烷）改性。通过总洗脱和吸水试验研究了评价材料的水解稳定性。每日监测净质量变化百分比，并作为时间的函数进行分析。力学性能通过弯曲性能和维氏硬度来检查。扫描电镜观察表面形态变化。方差分析（P < 0.05）。一般来说，使用HEMA代替TEGDMA不会显著恶化复合材料的质量。仅含有纳米羟基磷灰石颗粒作为填料的牙科复合材料不适用于临床性能。中途填充的复合树脂加载微羟基磷灰石颗粒，涂有柠檬酸，丙烯酸或甲基丙烯酸表现出较低的洗脱率和吸水率值。机械性能与硅烷处理过的颗粒相似，甚至优于上级。需要更多的研究来进一步改善纳米HAP颗粒与聚合物基体的相互作用，无论是作为单一填料还是优选地与微米HAP混合，这将允许增加增强填料的总负载，并因此改善机械性能。(C)2003年牙科材料学院。由Elsevier Science Ltd.出版，版权所有。
Objectives. The purpose of this study was to analyze the behavior in water, related to mechanical properties, of experimental composites for dental restoration.Methods. The studied materials were composed of a visible-light-curing monomer mixture (Bis-GMA and TEGDMA or HEMA) and micrometric, nanometric or a mixture of both sizes hydroxyapatite particles as a reinforcing filler. Filler particles were modified with a coupling agent (citric, hydrosuccinic, acrylic or methacrylic acid or silane). The hydrolytic stability of the evaluated materials was studied through total elution and water-uptake tests. Percent net-mass variation was daily monitored and analyzed as a function of time. Mechanical performance was examined through flexural properties and Vickers hardness. Morphological surface changes were observed with scanning electron microscopy. ANOVA statistical analysis was performed (P < 0.05).Results. In general, the use of HEMA instead of TEGDMA did not substantially worsen the composite quality. Dental composites containing only nanometric particles of hydroxyapatite as a filler are unsuitable for clinical performance. Midway-filled composite resins loaded with micro-HAP particles, coated with citric, acrylic or methacrylic acid displayed low percent elution and water-uptake values. Mechanical properties were similar or even superior to those measured for silane treated particles.Significance. More research is needed to further improve the interaction of nano-HAP particles with the polymeric matrix, either as a single filler or, preferentially, mixed with micro-HAP, that will allow to increase the total loading of reinforcing filler and, hence, to improve the mechanical properties. (C) 2003 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.