Preformed crowns arepre-made crowns commonlyusedto restore primaryteeththathavehard tissue loss on or more surfaces, crown fractures, high risk of caries or have dental developmental defects. They can also beused in permanentdentition as an interim restoration until more permanentrestorationcan be done. The preformed crownscomein a variety of sizes and the correct size is chosen to fit the trimmed down tooth.