When a tooth has been extensively restored either by large fillings or a previous crown then full coverage of the remaining tooth structure is required to regain strength and durability. The tooth has to be reduced sufficiently such that the final crown looks natural and does not interfere with the bite position. These are the most destructive restorations to the tooth structure however if carried out correctly they can last a lifetime. Conventional crowns have a thin layer of gold under the porcelain to increase strength.

The latest material advances have produced all ceramic crowns with almost the same strength - most noticeably the PROCERA crown, which is fabricated on a layer of solid alumina produced by a complicated computer design and machining facility in Sweden (as the only facility in the world, each crown substructure is manufactured in Sweden before being sent to our master ceramist in Manchester for the final ceramic work.) Without the layer of gold the PROCERA crowns have almost as good aesthetics as porcelain veneers.

Before and after replacement of failing crowns and bridgework in lower left quadrant. Upper quadrant has already been completed.
Before	After

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