Wear of resin-modified glass ionomers : an in vitro study

The purpose of this study was to evaluate the wear resistance and clinical applicability of resin-modified

glass ionomer cements as restorative or fissure-sealing materials. The in vitro wear of resin-modified

glass ionomers was compared to conventional glass ionomers, a resin-based sealant, and a composite

resin. A three-body wear test (enamel block - polymethylmethacrylate powder - experimental

dental material) was performed by 20,000 cycles with a load of 4kgf/cm2. The depth of wear of the

experimental materials was measured and calculated using a computerized laser surface scanner. The

glass ionomers generally showed more wear than the resin-based sealant and the composite resin, but

there was no difference in wear between resin-modified and conventional glass ionomers. Type III

ionomers (used for sealant) showed lower wear resistance than type II ionomers (used for restoration).

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