COMPOMERS AND GLASS IONOMERS - BOND STRENGTH TO DENTIN AND MECHANICAL-PROPERTIES

Purpose: To compare compomers and conventional and resin-modified glas s ionomer cements (GIG) with respect to bond strength to dentin and me chanical properties. Materials and Methods: Seven conventional GICs (B aseline, ChemFil Superior, Fuji II, Fuji IX, Ketac-Fil, Ketac-Silver, and Miracle Mix), three resin-modified GICs (Fuji II LC, Photac-Fil, a nd Vitremer), and two compomers (Dyract and Compoglass) were investiga ted. Bond strength was determined to untreated as well as pre-treated human dentin. The mechanical properties tested were flexural strength and flexural modulus. Results: Mean bond strengths to untreated dentin ranged from 0.0 MPa (Photac-Fil) to 8.5 MPa (Fuji IX). Generally, the bond strengths of the compomers and resin-modified GICs were lower th an those of the conventional GICs. Mean bond strengths to pre-treated dentin ranged from 0.5 MPa (Photac-Fil) to 13.7 MPa (Compoglass). No c lear-cut bond strength pattern was observed for the three types of mat erials. Pretreatment improved the bond strength of nine out of 12 mate rials. Flexural strengths ranged from 13 MPa (Miracle Mix) to 180 MPa (Dyract). Generally, the compomers were stronger than the resin-modifi ed GICs, which were much stronger than the conventional GICs. Flexural moduli ranged from 4.0 GPa (Miracle Mix) to 7.2 GPa (Fuji IX and Dyra ct) with no typical variations between the three categories of materia ls.