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INTRODUCTIONrnSince the discovery of Bioglass by Hench et al. in 1969, various kinds of glass and glass-ceramic have been found to bond to living bone. All those bioglass and glass-ceramic including CaO-SiO2 components contributed to the bioactivity of those materials. The polymorphism of dicalcium silicate (Ca2SiO4) has been well studied because of the considerable importance of this compound in the cement and refractories industries. Dicalcium silicate may be bioactive in human body because it is also composed of CaO-SiO2 components.rn