IADR Abstract Archives
Wear of Modern Resin-Modified Glass-Ionomers
The improved mechanical properties of resin-modified glass-ionomers (RMGI's) compared to the traditional glass-ionomers (GI's) were in past experiments not reflected in improved wear properties. Recent product development of RMGI's may have changed this situation. Objective: The aim of this study was to determine the wear of two new RMGI's EX672A (experimental Nano-Ionomer, 3M ESPE) and Fuji Fil LC (GC) and to compare this with a current RMGI Fuji II LC (GC) and two traditional GI's Fuji II (GC) and Fuji IX (GC). Methods: Wear experiments were performed in the ACTA wear machine at various time periods after the start of curing. Specimens were prepared at 37ºC and five minutes after curing the specimens were always kept wet at 37ºC, during storage, test runs, and measurements. All materials were hand-mix products. Results: The table shows the consecutive wear in μm/200,000 cycles at five time moments. Conclusion: While the early wear (within the first week) of EX672A Nano-Ionomer was significantly better than that of FII LC, no improvement was found for Fuji Fil LC. As a result of ongoing maturation, all materials showed decreasing wear rates. However "the big steps" for Fuji Fil LC suggest that directly after light curing the acid-base reaction needs a long time to fully set the material. The traditional GI's still perform better than the newest RMGI's.
Wear in μm/200,000 cycles determined in the ACTA wear machine at 10N antagonist load.
| age | EX672A | Fuji Fil LC | Fuji II LC | Fuji II | Fuji IX |
| 1 day | 128(3) | 363(6) | 180(8) | 97(3) | 79(5) |
| 4 days | 113(4) | 240(8) | 123(4) | 68(2) | 56(3) |
| 1 week | 108(3) | 142(6) | 103(6) | 72(2) | 52(2) |
| 4 weeks | 101(1) | 152(4) | 109(4) | 52(0) | 43(1) |
| 8 weeks | 90(3) | 121(5) | 90(4) | 55(1) | 42(2) |
Materials were supplied by 3M ESPE AG Seefeld, Germany.