A tooth can only hold so much filling material. When you have more filling than tooth and you need something stronger, a bonded porcelain restoration may be the best choice. A custom made porcelain crown or onlay replaces only the missing and weak areas of your tooth. Healthy areas are left alone. The porcelain is bonded to your tooth. This leaves more of your natural tooth structure than a cemented crown would. Gentle Dentistry's favorite material for an onlay or crown is an all porcelain bonded restoration created with CAD/CAM right in our office. There is no metal in the restoration to block the reflection of light, so it looks like a real tooth. Also, the gum tissue stays healthier when there isn't any artificial material at the gum line, like there is with a conventional porcelain and metal crown.