Lithium disilicate. Zirconia is the strongest material we currently have, but may be too much for heavy bruzer. Best to wear an occlusal guard. All metal crowns (back teeth) have the test of time to support their usefulness and compatibility against your natural opposing teeth. I do not recommend E-Max for my patients for second molars. See the Prosthodontist for evaluation of your specific needs. Good Luck.
Porcelain crown. emax = type of all-ceramic crown which is preferred for its longer lasting, aesthetic qualities in the anterior front area and can also be used with zirconia substructures for added strength. Brusism = gold or zirconia in the posterior back teeth.