摘要
目的:研究人工唾液对银汞合金和玻璃离子水门汀2种口腔充填材料承载能力的影响,比较不同材料受环境影响的特征。方法:制作10mm直径、2mm厚度的银汞合金和玻璃离子水门汀圆盘形试件各80个,各自随机分成8组,分别放入干燥容器和盛有人工唾液的容器内置于37℃恒温箱中保存1、7、30、90d,置于30%玻璃纤维加强尼龙6,6基底上以20mm直径不锈钢球加载进行赫兹压痕试验,记录初始断裂载荷值并进行统计分析。结果:在90d观察期内,银汞合金的断裂载荷值在空气中从(641.09±121.16)N增加到(775.08±105.37)N(P<0.05),在人工唾液中则从(680.09±115.90)N减少到(620.00±62.17)N,但无统计学差异(P>0.05)。玻璃离子水门汀的断裂载荷值在空气中波动于(391.18±83.10)^(456.25±74.14)N范围,无统计学差异(P>0.05);在人工唾液中则从(388.70±66.78)N显著减少到(308.45±53.49)N(P<0.05)。经过不同的时间段后,2种材料最终均表现为在人工唾液中的断裂载荷值低于在空气中的值。结论:长期人工唾液浸泡对口腔充填材料的承载能力有明显负性影响;不同材料对储存介质的影响反应不同。
Objective： To investigate the effect of artificial saliva on the load bearing capacity of two dental restorative materials ： Amalgam and glass ionomer cement （GIC） , comparing the various responses of dental materials on the storage medium. Methods. Discs of 10 mm diameter and 2 mm thickness were prepared for amalgam and glass ionomer cement, 80 for each material. Specimens of each material were randomely divided into 8 groups and stored in 37 ℃ dry air and artificial saliva （AS） for 1, 7, 30 and 90 d respectively. After storage, they were tested on top of glass-rein- forced polyamide-nylon 6,6 substrates by a univesral testing machine, loading centrally with a 20 mm diameter ball. Loads at the first crack were recorded and analyzed. Results： Within the 90 d observation period, failure load of airstored amalgam kept increasing from （641.09 ± 121.16 ） N to （ 775.08 ± 105.37 ） N （ P 〈 0.05 ）, while that of AS- stored amalgam decreased from （680.09 ± 115.90） N to （620.00± 62.17 ） N, but no significance was found （P 〉 0.05）. Failure loads of air-stored GIC fluctuated within the range of （391.18±83.10） to （456.25 ± 74.14） N, no significance was found （P 〉 0.05 ） ; loads of AS-stored GIC significantly decreased from （ 388.70 ± 66.78 ） N to （308.45 ± 53.49） N （ P 〈 0.05 ）. The values of AS-stored specimens of both materials became lower than those of air- stored specimens after a certain period of time. Conclusion： Long-term AS storage has a negative effect on the load- bearing capacity of both antalgam and GIC. The response upon storage medium varies among materials.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2008年第3期328-330,共3页
Journal of Practical Stomatology
关键词
人工唾液
银汞合金
玻璃离子水门汀
承载能力
Artificial saliva
Amalgam
Glass ionomer cement
Load bearing capacity
