Sm Moazzami, R Sadid Zadeh, K Kianoush, M Sarmad, F Barani Karbaski, R Amiri Daluyi, Rb Kazemi
Dental Research Center and Department of Operative and Esthetic Dentistry, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Restorative Dentistry, School of Dental Medicine, Buffalo, NY.
J Dent Biomater. 2016 Sep;3(3):261-268.
Bioglasses are a series of biocompatible dental materials, which are considered as light conducting inserts in resin composite restorations. Consequently, their chemical stability is more essential when they are used in conjunction with resin composite.
The aim of this study was to evaluate and compare the chemical stability of Bioglass with dental porcelain and resin composite by determining the amount of released K+, Na+, Ca2+ ions and silicone elements from these materials as a result of exposure to tested solutions with different pH levels including: Sodium Bicarbonate [SB, (pH=9.2)], Sodium Buffer Lactate [SBL, (pH=2.4)], Acetic Acid [AA, (pH=2.4)], and Distilled Water [DW, (pH=6.2)].
In this experimental study, forty 2.0 × 4.0 cylindrical rods for each tested material group (Dental porcelain, Resin composite and Bioglass) were prepared. They were divided into four subgroups of 10 rods each, which immersed in one of the four testing solutions in a designated container. The containers were stored at 50°C and 100% humidity for one week. The released ions were measured by using a spectrophotometer (µg/cm/ml). The data were statistically analyzed by nonparametric Kruskal-Wallis H test.
It was observed that the tested materials released ions at different levels of concentration. The significant amounts of Sodium, Calcium, and Silicon ions release were measured in Bioglass subgroups in all the tested solutions ( < 0.001). Potassium ion release from dental porcelain was the largest in all solutions except for AA in which Bioglass had the greatest potassium ion release ( < 0.001).
A greater structural instability was observed for Biogalss group than dental porcelain and resin composite in testing solutions with different pH levels.
生物玻璃是一系列具有生物相容性的牙科材料，被视为树脂复合材料修复体中的光导插入物。因此，当它们与树脂复合材料一起使用时，其化学稳定性更为重要。
本研究的目的是通过测定这些材料在暴露于不同pH值的测试溶液（包括碳酸氢钠[SB，(pH = 9.2)]、乳酸钠缓冲液[SBL，(pH = 2.4)]、乙酸[AA，(pH = 2.4)]和蒸馏水[DW，(pH = 6.2)]）后释放的K+、Na+、Ca2+离子和硅元素的量，来评估和比较生物玻璃与牙科陶瓷及树脂复合材料的化学稳定性。
在本实验研究中，为每个测试材料组（牙科陶瓷、树脂复合材料和生物玻璃）制备了40根2.0×4.0的圆柱形棒。将它们分为四个亚组，每组10根棒，分别浸入指定容器中的四种测试溶液之一。容器在50°C和100%湿度下储存一周。使用分光光度计（μg/cm/ml）测量释放的离子。数据采用非参数Kruskal-Wallis H检验进行统计学分析。
观察到测试材料释放出不同浓度水平的离子。在所有测试溶液中，生物玻璃亚组中均检测到大量的钠、钙和硅离子释放（<0.001）。除了在乙酸溶液中生物玻璃释放的钾离子最多外，在所有溶液中牙科陶瓷释放的钾离子量最大（<0.001）。
在不同pH值的测试溶液中，生物玻璃组比牙科陶瓷和树脂复合材料表现出更大的结构不稳定性。
