国际口腔医学杂志 ›› 2020, Vol. 47 ›› Issue (2): 189-195.doi: 10.7518/gjkq.2020021
Qing Ping1,Gao Shanshan2,Qian Linmao3,Yu Haiyang2()
摘要:
目的 研究伽马射线对釉质微观摩擦磨损性能、物质组成、晶体结构等方面的影响,为临床选择恰当的修复材料提供参考。方法 采用纳米划痕仪等仪器研究釉质在受到伽马射线照射后,其表面力学性能和摩擦学行为改变;使用X射线衍射仪、傅立叶变换红外线光谱分析仪观察射线对釉质晶相结构和化学成分的影响。结果 伽马射线照射后,釉质表面呈现更多碎屑及剥落;表面显微硬度Knoop硬度值(KHN)从照射前(420±20)KHN显著降低到(333±11)KHN(P<0.000 1);釉质晶体结晶度从82.42%±2.01%降低到71.11%±2.62%(P<0.05);晶粒尺寸和碳酸盐:矿物比均有明显增加,分别从(24.35±1.00)nm增大到(26.72±1.88)nm(P<0.05),从0.034±0.005增大到0.052±0.010(P<0.05)。结论 伽马射线可降低釉质耐磨性能,临床上为接受放射治疗的患者提供口腔治疗时应充分考虑这一因素。
中图分类号:
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