#14 zirconium onlay or three quarter crown

conservative onlay to hold tooth together The Minimal preparation for a Zirconium Onlay is shown on the upper left side . This tooth has a crack on the distal lingual cusp. The onlay will hold the tooth together. A large three surface filling would have fracture the lingual cusp. This onlay is more esthetic than a gold onlay (because it is tooth colored). Less tooth structure is removed than for a lithium disilicate onlay or porcelain fused to metal crown