国际口腔医学杂志

国际口腔医学杂志 ›› 2020, Vol. 47 ›› Issue (2): 189-195.doi: 10.7518/gjkq.2020021

• 论著 • 上一篇    下一篇

伽马射线对釉质摩擦磨损性能影响的研究

卿萍1,高姗姗2,钱林茂3,于海洋2()   

  1. 1. 成都市第三人民医院口腔科 成都 610031
    2. 口腔疾病研究国家重点实验室 国家口腔疾病临床医学研究中心四川大学华西口腔医院修复科 成都 610041
    3. 西南交通大学牵引动力国家重点实验室 成都 610031
  • 收稿日期:2019-05-21 修回日期:2019-11-22 出版日期:2020-03-01 发布日期:2020-03-12
  • 通讯作者: 于海洋
  • 作者简介:卿萍,主治医师,博士,Email： 250963242@qq.com

Microtribological behaviour of human tooth enamel treated by gamma irradiation

Qing Ping1,Gao Shanshan2,Qian Linmao3,Yu Haiyang2()   

  1. 1. Dept. of Stomatology, The Third People’s Hospital of Chengdu, Chengdu 610031, China
    2. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
    3. Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2019-05-21 Revised:2019-11-22 Online:2020-03-01 Published:2020-03-12
  • Contact: Haiyang Yu

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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。

关键词: 伽马射线, 纳米划痕, 釉质, 摩擦磨损性能

Abstract:

Objective This study aimed to understand the effect of gamma irradiation on the microstructure, composition and microfriction and wear properties of human tooth enamel. Methods Nanoscratch tests, surface profilometer and scanning electron microscope analysis were used to evaluate the friction behaviour of human tooth enamel slabs before and after gamma irradiation. X-ray diffraction and Fourier transform infrared spectroscopy were performed to analyse changes in crystallography and chemical composition induced by irradiation. Surface microhardness alteration was also evaluated. Results After irradiation, additional partial packing and delamination with high friction coefficient were observed in the enamel. The Knoop hardness number (KHN) of the enamel significantly decreased from (420±20) KHN before irradiation to (333±11) KHN (P<0.000 1) after irradiation. The crystallinity decreased from 82.42%±2.01% to 71.11%±2.62% (P<0.05). The crystal size increased from (24.35±1.00) nm before irradiation to (26.72±1.88) nm (P<0.05) after irradiation. The carbonate：mineral ratio increased from 0.034±0.005 to 0.052±0.010 (P<0.05). Conclusion Gamma irradiation decreased the wear resistance of enamel. Results should be considered when performing clinical restorations.

Key words: gamma irradiation, nano-scratch, enamel, microfriction and wear

中图分类号: 

  • R781.2

图 1

伽马射线照射前后不同载荷条件下釉质微观磨损情况 A1~A4：当载荷分别为20、40、60和80 mN时,伽马射线照射前釉质微观磨损情况;B1~B4：当载荷分别为20、40、60和80 mN时,伽马射线照射后釉质微观磨损情况。"

图 2

伽马射线照射前后釉质摩擦系数曲线图"

表 1

伽马射线照射前后釉质表面划痕深度和宽度对比"

参数 载荷/mN 照射前 照射后 P值
划痕深度/nm 20 25.1±2.3 29.3±5.8 0.23
40 79.1±7.1 98.1±11.3 0.03
60 177.8±10.1 224.8±4.5 0.000 1
划痕宽度/μm 20 2.7±0.3 2.8±0.2 0.51
40 3.6±0.3 3.7±0.3 0.68
60 4.6±0.7 5.1±0.1 0.40

图 3

伽马射线照射前后釉质X射线衍射图谱"

图 4

伽马射线照射前后釉质红外光谱图"

表 2

伽马射线照射前后釉质结晶度、晶粒大小以及碳酸盐∶矿物比值"

参数 照射前 照射后 P值
结晶度/% 82.42±2.01 71.11±2.62 0.02
晶粒大小/nm 24.35±1.0 26.72±1.88 0.01
碳酸盐：矿物比值 0.034±0.005 0.052±0.01 0.02
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