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The preparation of inlays and onlays mainly follows the same basic concepts of indirect restorations. The aim of tooth preparation is to preserve more tooth tissue compared to a crown preparation, while giving an adequate amount of protection to the tooth.
An inlay is a restoration that lies within the confines of the cusps. These restorations are considered to be more conservative than onlays or crowns because less tooth structure is removed in preparation for the restoration. They are usually used when tooth destruction is less than half the distance between cusp tips.
Extracoronal preparations provide a core or base upon which restorative material will be placed to bring the tooth back into a functional and aesthetic structure. Examples include crowns and onlays, as well as veneers. In preparing a tooth for a restoration, a number of considerations will determine the type and extent of the preparation.
Crown tractors and forceps can be used to grip the restoration and dislodge it from the tooth preparation. Crown tractors are designed to have rubber grips and powder on their beaks to reduce the risk of damaging ceramic restorations. Crown tractors are quite effective in removing crowns luted with temporary cements. [58]
Crownlays are typically used in place of traditional post and core restorations. Post and core buildups are essentially rods of restorative material made out of titanium, stainless steel or resin that glean extra surface area against the internal walls of root canal-treated teeth when there is little to no teeth left above the gumline to hold a normal crown or onlay in place.
Cementation of inlays, onlays, crowns and bridges made of precious metal, non-precious metal as well as metal ceramic and all-ceramic (zirconium oxide, aluminium oxide and lithium disilicate ceramic) Cementation of implant-supported crowns and bridges; Cementation of orthodontic bands; Cementation of retention pins and screws; Core build-ups
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