The extracellular matrix of dentin consists of mineral (hydroxyapatite), collagen, and several noncollagenous matrix proteins. These noncollagenous matrix proteins may be mediators of cell-matrix interactions, matrix maturation, and mineralization. This review describes the current knowledge of the chemistry of mineral crystal formation in dentin with special emphasis on the roles of the dentin matrix proteins. The functions of some of these matrix proteins in the mineralization process have been deduced based on in vitro studies. Functions for others have been postulated based on analogy with some of the bone matrix proteins. Evidence suggests that several of these matrix proteins may have multiple effects on nucleation, crystal growth, and orientation of dentin hydroxyapatite.
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