Porcelain inlays and onlays are used to treat moderate levels of decay or damage while maintaining a pleasing appearance.
Porcelain inlays are fitted into a cavity, or space, in a tooth, while a porcelain onlay extends to replace a cusp, or the elevated bump of a tooth.
Porcelain inlays and onlays are used when the tooth is not damaged seriously enough to require a dental crown, but not enough tooth structure remains for a normal filling.