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The surface free energy and its polar- and dispersion components pertaining to pellicle-covered human enamel, sintered hydroxyapatite, Diacryl® and fluorethy-lenepropylene were determined from contact angle measurements. During the first 5 min of pellicle formation, the total surface free energy of human enamel increased from 84 to 110 erg·cm––2. After these first 5 min the surface free energy of pellicle covered solids remained constant for at least 2 h. Pellicle formation on apolar solids like fluorethylenepropylene increased the surface free energy only slightly.
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Jong et al. (2009) studied this question.
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