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Abstract
Abrasion behavior of new nanohybrid polymer + ceramic dental materials designed for filling dental cavities is reported. The polymer matrix is a polyurethane while the dispersed phases include particles of silica and alumina with the diameters below 100 nm. Several commercial obturation materials are investigated by the same technique. The authors' new nanohybrids show clearly superior resistance to abrasion wear – in one case some 20 times better than a commercial sample. Moreover, the new materials exhibit low toxicity, short curing times (<10 min), good dimensional stability (low contraction), high chemical resistance and good pigmentation capacity and they are easy to prepare and show good adhesion to the substrate (dentine or enamel).
