The appropriateness of material depends on how strong it needs to be and how aesthetic it can be. Your dentist will assess your teeth and mouth, present you with options of a few suitable materials, and recommend you the best material for your crown.
There are all-porcelain crowns (e.g. Emax, Zirconia, layered porcelain) which are a popular choice for both front and back teeth. There are also porcelain fused to metal crowns as well as full-metal crowns which can be good options for back teeth in certain cases.