User:Saiteru Meijo/cologneblue.js

Mechanical Properties of Sound Dentin ; After the shear test, the tooth samples were longitudinally sectioned through their center with a water-cooled diamond saw. Half of the specimens were embedded in polymethyl methacrylate and wet- polished with 600, 1200, 1500, and 2000 grit SiC abrasive papers, followed by a final polishing with a 1 lm polycrystalline diamond suspension. Cross- sectional hardness measurements were performed with a Vickers indenter (CSM Micro-Hardness Tester; CSM Instruments, Peseux, Switzerland). Indentations were made in the dentin at depths of 10, 20, 30, 40, 50, 100, 150, and 200 micrometros from the occlusal surface of each specimen. Indentation was performed with a controlled force, the test load being increased or decreased at a constant speed and ranging between 0 and 500 mN at 60-second intervals; the maximal load was maintained for 15 seconds. The load and penetration depth of the indenter were measured continuously during the load-unload hysteresis. Hardness was defined as the applied force divided by the apparent area of the indentation at maximal force. Elastic modulus was calculated from the slope of the tangent to the indentation depth curve at maximal force.