Demineralisation and remineralisation of dentine caries, and the role of glass-ionomer cements

In accordance with the principles of modern operative dentistry, to conserv e tooth structure and to use therapeutic restorative materials, an understa nding of the carious process in dentine and the biological properties of gl ass-ionomer cements (GICs) are necessary. Delineation of the outer necrotic from the inner vital and remineralisable carious dentine allows for the pr eservation of tooth structure. This delineation is not possible when relyin g on visual and tactile perceptions, but requires the use of a caries detec ting dye. GICs are ideal dentine substitutes because of their anticariogeni c properties, stable long-term ionic bonding, and ability to assist the pro cess of remineralisation. The range of usage of these restorative materials continues to expand with the development of improved products.