Investigation on the wear behavior of human tooth dentin treated by gamma irradiation

Ping Qing; Shengbin Huang; Shanshan Gao; Linmao Qian; Haiyang Yu

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Investigation on the wear behavior of human tooth dentin treated by gamma irradiation

Ping Qing 1,Shengbin Huang 2,Shanshan Gao 3,Linmao Qian 4,Haiyang Yu 1 * #

1.State Key Laboratory of Oral Disease,West China Hospital of Stomatology, Sichuan University

2.Departrment of prosthodontics, Wenzhou Medical University

3.Department of Prosthodontics, Weat china Hospital of Stomatology, Sichuan University

4.Tribology Research Institute, Southwest Jiaotong University

*Correspondence author

#Submitted by

Subject:

Funding: Specialized Research Fund for the Doctoral Program of Higher Education （No.20110181110056）

Opened online:15 December 2015

Accepted by: none

Citation: Ping Qing,Shengbin Huang,Shanshan Gao.Investigation on the wear behavior of human tooth dentin treated by gamma irradiation[OL]. [15 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4670360

This study aimed to evaluate the effect of gamma irradiation on the wear behavior of human tooth dentin in terms of alteration in crystallography and composition. Human premolars (n = 19) were collected to obtain perpendicular-sectioned dentin slides and parallel-sectioned dentin slides. Each slab was subjected to 2 Gy radiation dose to a cumulative dose of 60 Gy for 5 d a week, which lasted ix weeks. Nano-scratch tests were conducted on dentin surfaces with progressive loads from 0.1 mN to 80 mN. Scratch traces were observed using a scanning electron microscope and a surface profilometer. The effect of irradiation treatment on crystallography and chemical composition of dentin was investigated through X-ray diffraction and Fourier transform infrared spectroscopy. Changes in surface microhardness (SMH) were also evaluated. Nano-scratch results showed that the coefficient of friction of dentin increased after irradiation was administered; the depths and widths of the scratches were larger than those of dentin before irradiation was administered. Irradiation decreased the crystallinity of dentin and induced the formation of large crystals. The carbonate:mineral (C:M) ratio also increased. SMH significantly decreased after irradiation was administered. The main damage mechanisms involved delamination and crack formation in perpendicular-sectioned slides and parallel-sectioned slides of dentin after irradiation was administered. Therefore, irradiation directly affected the wear behavior of dentin on human tooth; irradiation also altered crystallography, chemical composition, and SMH of dentin.

Keywords:Wear behavior, gamma irradiation, nanoscratch test, tooth dentin

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