Ceramic for dental
In Dental science, ceramics are referred to as nonmetallic, inorganic structures primarily containing compounds of oxygen with one or more metallic or semi-metallic elements. They are usually sodium, potassium, calcium, magnesium, aluminum, silicon, phosphorus, zirconium & titanium. Ceramics have excellent intraoral stability and wear resistance adding to their durability. Basically ceramics are used as indirect restorative materials such as crowns and bridges, Inlays and dental implants. Recently ceramic braces are used in orthodontics.
Dental cements are basically glasses. Initially, silicate cements were introduced. The cement powder contains a glass of silica, alumina and fluorides. The liquid, on the other hand, is an aqueous solution of phosphoric acid with buffer salts. The cement powder and liquid are mixed together resulting in an acid-base reaction. Fluoride ions are leached out from the set cement, which is responsible for the anti-cariogenic property exhibited. Cements are direct restorative materials – i.e. manipulated and placed onto teeth directly, unlike other restorations that are made outside and fixed to teeth, called indirect restorations. They are highly advantageous as they are quick to set, release fluoride leading to anti cariogenic action, esthetic and chemically bond to tooth material.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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