Onlays and 3/4 crowns are variations on the technique of dental crowns. The difference between these crowns and the crowns discussed previously is their coverage of the underlying tooth.

Inlays and onlays are more durable and last much longer than traditional fillings -- up to 30 years. They can be made of tooth-colored composite resin, porcelain, or gold.

It generally last more than 15 years. Ceramic inlays and onlays may cost between Rs 1200 2000. Used for: Mostly used for inlays, onlays and veneers.

"The current study results showed that teeth restored with zirconia ceramic inlay and onlay restorations have approximately the same fracture resistance values," the study authors wrote. "This could ...