Int J Stomatol

Int J Stomatol ›› 2020, Vol. 47 ›› Issue (2): 189-195.doi: 10.7518/gjkq.2020021

• Original Articles • Previous Articles     Next Articles

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 E-mail:yhyang6812@scu.edu.cn

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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

CLC Number: 

  • R781.2

TrendMD: 

Fig 1

Scanning electron microscope pictures of the nanoscratch in the enamel slides before and after gamma irradiation under different loads"

Fig 2

The comparison of coefficient of friction between enamel slides before gamma irradiation and enamel slides after irradiation with variable load"

Tab 1

Variation of remnant depth and width of scrat-ches on the enamel slides before and after gamma irradiation with variable loads"

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

Fig 3

X-ray diffraction patterns of enamel slides before and after gamma irradiation"

Fig 4

Fourier transform infrared spectrum of enamel slides before and after gamma irradiation"

Tab 2

The comparison of the crystallinity, crystal size and carbonate：mineral ratio value of enamel slides before and after gamma irradiation"

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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