Dental restorations are frequently used to address aesthetic problems, even in the absence of carious lesions. This is valid for patients with intrinsic or extrinsic stains (caused, for example, by smoking or by using antibiotics, respectively), as well as for restorations requiring an opaque reinforcing structure, such as posts made of metal or highly crystalline ceramic. The masking ability of restorative materials is dependent on both their optical constants, as mentioned earlier, and their thickness. Dental restoration techniques heavily rely on precious metals in general and gold in particular for the manufacture of orthodontic appliances, crowns, bridges, partials, and cavity fillings. A number of material requirements must be met by alloys used in dentistry. Alloys must be nontoxic and biocompatible, and they must also have mechanical qualities suitable for uses subject to stress and wear. Additionally, the ceramic-to-metal bonding properties and dimensional stability of appliances made using this technique must be good.
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