Abstract
A new dental cement composed of hydroxyapatite, zinc oxide, and acrylic acid copolymer was developed. Setting time and consistency of the hydroxyapatite cement were tested by JIS method. Compressive, 4-point bending and diametral tensile strengths of the cement were about 700, 250, and 80 kg/cm2, respectively.These physical properties showed that the cement can be applied to the clinical dental uses. As increasing the contents of hydroxyapatite, setting time of the cement was prolonged and the modulus of elasticity was elevated. Compressive strength of the cement decreased, as the ratio of water/powder (W/P) increased.The hydroxyapatite cement was incubated at 37℃ in distilled water, physiological salt solution and human parotid saliva for 6 days.The texture of cement was not changed and the compressive strength increased in each incubation condition.
