Table 1. Elastic modulus and nanohardness of different samples in evaluation of mechanical properties.

Sample	Avg Modulus [500–1000 nm] GPa	Avg Hardness [500–1000 nm]GPa
Dentin coated with regenerated tissue after 3 cycles	19.5 ± 3.1	1.12 ± 0.09
Untreated natural dentin	24.1 ± 1.6	0.72 ± 0.1
Etched dentin	5.5 ± 2.7	0.22 ± 0.06