A crown is a covering encasing the entire tooth surface restoring it to its original shape and size. A crown protects and strengthens teeth that cannot be restored with fillings or other types of restorations. There are several types of crowns for different needs. All-porcelain crowns such as Zirconia and E-max are excellent choices as they provide a natural appearance and feel. In particular, E-max crowns blend really well with your own natural teeth to provide a beautiful smile, and are considered the top of line choice for crowns.