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Bonding to dentin. Clues to the mechanism of adhesion
Purpose:
To investigate the effect on shear bond strength of the presence or absence of the demineralized collagen layer on both wet and dried etched dentin surfaces.
Materials And Methods:
Composite cylinders were mounted on dentin surfaces after the following treatments; 37% etch/wet, 37% etch/dry, 37% etch/NaOCl/wet, 37% etch/NaOCl/dry, No-etch/wet, No-etch/dry, No-etch/NaOCl/wet, No-etch/NaOCl/dry. 24-hr shear bond strength data was obtained. SEM examinations of various surfaces were also conducted.
Results:
Wet bonded specimens had significantly higher shear bond strengths, with or without the presence of the demineralized collagen layer, whether they were acid-treated or not. Acid-etched specimens had significantly higher shear bond strengths than unetched specimens.