[Study on micro-hardness and wear resistance of human tooth at different depth].
Micro-hardness of human teeth was measured by micro hardnessmentry at different depths i.e. enamal, enamelo-dentinal junction and dentin. A simulated dental friction test was conducted of respectively in these three areas, opposing pure titanium ball under a modified fretting machine. The results showed that micro-hardness is 320.40 +/- 22.77 HV of enamal, 232.26 +/- 32.31 HV of enamelo-dentinal junction, and 61.17 +/- 9.42 HV of dentin (P < 0.05). Wear depth is 17.33 +/- 0.58 microns of enamal, 49.44 +/- 16.47 microns of enamelo-dentinal junction and 95.20 +/- 15.07 microns of dentin(P < 0.05). Wear resistance of enamal is much better than that of dentin's. This preliminary investigation should be very useful in clinical applications.
Zhang
Jie
J
Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031.
Li
Hong
H
Zhou
Zhongrong
Z
Chen
Guangxiong
G
Song
Zhimin
Z
D000328:Adult; D006244:Hardness; D006245:Hardness Tests / Q000379:methods; D006801:Humans; D014070:Tooth / Q000033:anatomy & histology / Q000502:physiology*