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For gold alloys there should be 1.5mm clearance, whilst metal-ceramic crowns and full ceramic crowns require 2.0 mm. The occlusal clearance should follow the natural outline of the tooth; otherwise there may be areas of the restorations where the material may be too thin.
If porcelain is to be applied to the gold crown, an additional minimum of 1 mm of tooth structure needs to be removed to allow for a sufficient thickness of the porcelain to be applied, thus bringing the total tooth reduction to minimally 1.5 mm. For porcelain or ceramic crowns the amount of tooth reduction is 2 mm. For metal, it is 1 mm.
Full-porcelain dental materials include dental porcelain (porcelain meaning a high-firing-temperature ceramic), other ceramics, sintered-glass materials, and glass-ceramics as indirect fillings and crowns or metal-free "jacket crowns". They are also used as inlays, onlays, and aesthetic veneers. A veneer is a very thin shell of porcelain that ...
Historically inlays and onlays will have been made from gold and this material is still commonly used today. Alternative materials such as porcelain were first described being used for inlays back in 1857. [2] Due to its tooth like colour, porcelain provides better aesthetic value for the patient.
In the US, costs range anywhere from $1,000 a tooth upwards to $3,000 a tooth as of 2011. [needs update] Porcelain veneers are more durable and less likely to stain than veneers made of composite. [25] Recent longitudinal studies have assessed the survival rates of porcelain laminate veneers over extended periods.
Crown survival: metal-ceramic: 95.4 percent; all-ceramic: 91.2 percent; cumulative rate of ceramic or acrylic veneer fracture: 4.5 percent [76] Peri-implantitis: 9.7 percent [76] up to 40 percent [77] Peri-implant mucositis: 50 percent [77] Implant fracture: 0.14 percent [76] Screw or abutment loosening: 12.7 percent [76]