Once again the concept of minimal invasiveness is followed here, removing only the damaged tooth structure retaining as much precious enamel as possible. Since a lab step is involved, inlays and onlays take at least two appointments. These procedures are appropriate for medium to large restorations. Crowns Crowns are needed when too much tooth structure is damaged and composites or onlays will not work well. Modern crowns are more attractive and healthy than their predecessors as well.
New porcelains are much more enamel like, wearing in a natural fashion and having a natural luster.
Some crowns are made of all porcelain as well.