Fig. 3
From: Ultraviolet irradiation improves the hydrophilicity and osteo-conduction of hydroxyapatite
The water-drop contact angle on the HA disk surface indicated hydrophobicity before UV irradiation and hydrophilicity after UV irradiation. The contact angle of both surfaces showed a time-dependent reduction in hydrophilicity. *p < 0.05, *0% porosity UV(−) vs 0 min, 1 h, and 3 h after UV irradiation; †p < 0.05, †55% porosity UV(−) vs 0 min and 1, 3, 6, 12, and 24 h after UV irradiation; ‡p < 0.05, ‡0% porosity vs 55% porosity at 0 min; 1, 3, 6, and 12 h; and 1 week after UV irradiation (n = 4)