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Effect of gamma irradiation on the wear behaviour of human tooth enamel.

Qing P, Huang S, Gao S, Qian L, Yu H - Sci Rep (2015)

Bottom Line: Surface microhardness (SMH) alteration was also evaluated.An inferior nanoscratch resistance was observed independent of prism orientation.Moreover, the variation of wear behaviours was closely related to changes in the crystallography, chemical composition and SMH of the enamel.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, PR China.

ABSTRACT
Radiotherapy is a frequently used treatment for oral cancer. Extensive research has been conducted to detect the mechanical properties of dental hard tissues after irradiation at the macroscale. However, little is known about the influence of irradiation on the tribological properties of enamel at the micro- or nanoscale. Therefore, this study aimed to investigate the effect of gamma irradiation on the wear behaviour of human tooth enamel in relation to prism orientation. Nanoscratch tests, surface profilometer and scanning electron microscope (SEM) analysis were used to evaluate the friction behaviour of enamel slabs before and after treatment with identical irradiation procedures. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were performed to analyse the changes in crystallography and chemical composition induced by irradiation. Surface microhardness (SMH) alteration was also evaluated. The results showed that irradiation resulted in different scratch morphologies, friction coefficients and remnant depth and width at different loads. An inferior nanoscratch resistance was observed independent of prism orientation. Moreover, the variation of wear behaviours was closely related to changes in the crystallography, chemical composition and SMH of the enamel. Together, these measures indicated that irradiation had a direct deleterious effect on the wear behaviour of human tooth enamel.

No MeSH data available.


Related in: MedlinePlus

XRD patterns of enamel before and after irradiation.Perpendicular-sectioned enamel (a); Parallel-sectioned enamel (b). FT-IR spectrum of enamel before and after irradiation. Perpendicular-sectioned enamel (c); Parallel-sectioned enamel (d).
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f3: XRD patterns of enamel before and after irradiation.Perpendicular-sectioned enamel (a); Parallel-sectioned enamel (b). FT-IR spectrum of enamel before and after irradiation. Perpendicular-sectioned enamel (c); Parallel-sectioned enamel (d).

Mentions: X-ray diffraction (XRD) spectra of the enamel before and after irradiation are shown in Fig. 3a,b. Experimental enamel XRD patterns were identified as hydroxyapatite, and the peaks were consistent with the standard hydroxyapatite diffraction pattern (JCPDS 86-0740). Meanwhile, the XRD analysis indicated that irradiation decreased the crystallinity of enamel and enlarged the crystal size both in perpendicular-sectioned enamel and parallel-sectioned enamel slides (Table 2).


Effect of gamma irradiation on the wear behaviour of human tooth enamel.

Qing P, Huang S, Gao S, Qian L, Yu H - Sci Rep (2015)

XRD patterns of enamel before and after irradiation.Perpendicular-sectioned enamel (a); Parallel-sectioned enamel (b). FT-IR spectrum of enamel before and after irradiation. Perpendicular-sectioned enamel (c); Parallel-sectioned enamel (d).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4477323&req=5

f3: XRD patterns of enamel before and after irradiation.Perpendicular-sectioned enamel (a); Parallel-sectioned enamel (b). FT-IR spectrum of enamel before and after irradiation. Perpendicular-sectioned enamel (c); Parallel-sectioned enamel (d).
Mentions: X-ray diffraction (XRD) spectra of the enamel before and after irradiation are shown in Fig. 3a,b. Experimental enamel XRD patterns were identified as hydroxyapatite, and the peaks were consistent with the standard hydroxyapatite diffraction pattern (JCPDS 86-0740). Meanwhile, the XRD analysis indicated that irradiation decreased the crystallinity of enamel and enlarged the crystal size both in perpendicular-sectioned enamel and parallel-sectioned enamel slides (Table 2).

Bottom Line: Surface microhardness (SMH) alteration was also evaluated.An inferior nanoscratch resistance was observed independent of prism orientation.Moreover, the variation of wear behaviours was closely related to changes in the crystallography, chemical composition and SMH of the enamel.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, PR China.

ABSTRACT
Radiotherapy is a frequently used treatment for oral cancer. Extensive research has been conducted to detect the mechanical properties of dental hard tissues after irradiation at the macroscale. However, little is known about the influence of irradiation on the tribological properties of enamel at the micro- or nanoscale. Therefore, this study aimed to investigate the effect of gamma irradiation on the wear behaviour of human tooth enamel in relation to prism orientation. Nanoscratch tests, surface profilometer and scanning electron microscope (SEM) analysis were used to evaluate the friction behaviour of enamel slabs before and after treatment with identical irradiation procedures. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were performed to analyse the changes in crystallography and chemical composition induced by irradiation. Surface microhardness (SMH) alteration was also evaluated. The results showed that irradiation resulted in different scratch morphologies, friction coefficients and remnant depth and width at different loads. An inferior nanoscratch resistance was observed independent of prism orientation. Moreover, the variation of wear behaviours was closely related to changes in the crystallography, chemical composition and SMH of the enamel. Together, these measures indicated that irradiation had a direct deleterious effect on the wear behaviour of human tooth enamel.

No MeSH data available.


Related in: MedlinePlus