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Figure 1. Schematic illustration of polymerization contraction stress determination in the tensilometer. The adhesive or adhesive/composite combination was placed between a glass plate of 4-mm thickness and, parallel to it, the pre-treated flat surface of the dentin specimen or sandblasted surface of the steel specimen. The specimens were fixed in a special steel holder and connected to the load cell. The glass plate (of which the surface on the spot for adhesion was sandblasted with Al2O3 and silanized) was mounted to the stationary part of the framework of the tensilometer.
