Load dependency and reliability of microhardness measurements on acid-etched enamel surfaces.

@article{Collys1992LoadDA,
  title={Load dependency and reliability of microhardness measurements on acid-etched enamel surfaces.},
  author={Kris Collys and D Slop and R. Cleymaet and Danny Coomans and Yvette Michotte},
  journal={Dental materials : official publication of the Academy of Dental Materials},
  year={1992},
  volume={8 5},
  pages={332-5}
}
The load dependency of hardness measurements was investigated on sound and demineralized enamel samples. For all samples investigated, the Knoop hardness number (KHN) varied as a function of the applied load. Higher loads enhanced indenter penetration into the test surface. The variation in KHN values observed in demineralized enamel, both surface-softened and surface-etched, was explained by a decrease in porosity as a function of depth. The reading error for indentations made on surface… CONTINUE READING