This class of composites was introduced as the product Ariston pHc in 1998. Ariston pHc is an ion-releasing composite material. It releases fluoride, hydroxyl, and calcium ions as the pH drops in the area immediately adjacent to the restorative material. The drop in pH values is the result of active plaque which results in a corresponding increase in the release of functional ions.3 Smart composites work based on the newly developed alkaline glass filler which will reduce secondary caries formation at the margin of a restoration by inhibiting bacterial growth. This results in a reduced demineralization and a buffering of the acid produced by caries forming microorganisms.31
The paste consists of Ba, Al, and F silicate glass filler (1 µm) with ytterbium trifluoride, silicon dioxide and alkaline Ca silicate glass (1.6 µm) in dimethacrylate monomers: it is filled 80% by weight and 60% by volume. The use of an adhesive to tooth is not recommended. However dentin should be sealed to reduce sensitivity. The fluoride release from this material is claimed by the manufacturer to be lower than conventional glass-ionomers but more than that of compomers.
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