Improvements in materials and techniques for adhesive dentistry have given restorative dentist instruments to provide patients with treatment options which are conservative and more esthetic than procedures like full crowns.

One such treatment modality for nearly destructed tooth, are inlays and onlays, a dental inlay or onlay is bigger than a filling and smaller than a crown, it is bonded or cemented into place, an inlay is similar to a filling, but it lies within cusp of the chewing surfaces of the tooth, while an onlay covers one or more cusp, inlays or onlays are made of gold, composite resin, or ceramics, they can last decades, but that all depends on the material, the teeth involved the forces of chewing, how well you maintian them with good oral hygiene and regiular vist to dentist. When deciding between a onlay and inlay restoration, occlusion strength and thickness of remaning tooth structre should be take into consideration.