Objectives: The purpose of this study was to evaluate early compressive strength of new resin-reinforced glass ionomer cement for luting, FujiCEM(CEM,GC, paste-paste type), RelyX Luting(RXL,3M, powder-liquid type) and Ketac-Cem(KC,ESPE, powder-liquid type). CEM was the first resin-reinforced glass ionomer luting cement available in past-past formulation. CEM has retained all of the basic features of commercial glass ionomer cement. Some of the remarkable features of CEM were mechanical property and sharp setting. To evaluate these characteristics, the early compressive strength of CEM, RXL and KC were measured.

Methods: Test method of the compressive strength was as follows. Cements were mixed according to the direction for use and filled into a mould (diameter 4mm x height 6mm). The specimens were stored in a chamber (37°C,100%R.H.) for 10minutes. Then the compressive strength was measured. The compressive strength after 1hour and 24hours of CEM, RXL and KC were also measured and compared.

	CEM	RXL	KC
Compressive strength (10min)	63.9 (7.7)	29.2 (6.3)	43.0 (7.7)
Compressive strength (1hour)	85.6 (6.9)	63.1 (3.6)	79.9 (7.3)
Compressive strength (24hour)	111.2(8.5)	83.8 (5.6)	99.6 (6.8)

Unit : MPa, ( ):S.D.

Results: The compressive strength of CEM after 10minute was higher than 50% of the compressive strength of CEM after 24hours. The compressive strength of CEM after 1hour was as same as about 77% of the compressive strength of CEM after 24hours. Comparing extracts by means of t test showed that the compressive strength after 10 minute of CEM was highest and there was statistical difference.

Conclusion: According to these results, it was suggested that the early compressive strength of CEM was superior to those of other glass-ionomer cement

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