The best replacement for glass ionomer is zinc phosphate.

The best alternatives to glass ionomer are rated as following:
★★★★★  zinc phosphate
★★★★  resin modified glass ionomer
★★★  resin cement
★★★  amalgam

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Speaking about glass ionomer, one probably shouldn't forget about amalgam.

Other search terms related to glass ionomer and their ratings are:
★★★★★ amalgam
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glass ionomer
zinc phosphate
resin modified glass ionomer