All Ceramic Restorations PDF

ALL CERAMIC RESTORATIONS Dr. Marwan Aggag BDS, MSc, PhD, FICOI LECTURER of FIXED PROSTHODONTICS Introduction Definition Ceramic is derived from the Greek word “keramos”, which literally means ‘burnt stuff ’, but which has come to mean more specifically a mat...

ALL CERAMIC RESTORATIONS Dr. Marwan Aggag BDS, MSc, PhD, FICOI LECTURER of FIXED PROSTHODONTICS Introduction Definition Ceramic is derived from the Greek word “keramos”, which literally means ‘burnt stuff ’, but which has come to mean more specifically a material produced by burning or firing. DENTAL CERAMICS : An inorganic compound with nonmetallic properties typically consisting of oxygen and one or more metallic or semi-metallic elements The term porcelain is referred to are feldspar-based, that is formulated to produce the whole or part composed of the significant amount of feldspar of a ceramic based dental prosthesis. (KAlSi3O8), quartz (SiO2), and kaolin (Al2O3·2SiO2·2H2O). History of Dental Ceramics 1. It was in 1774 that the first porcelain denture was created by Alexis Duchateau in France. 2. 1838 Elias Wildman produced dental porcelain that had reasonably good translucency and shades to match natural teeth. 3. The first porcelain jacket crowns containing either feldspar or alumina (also known as aluminous) were created in the early 1900s. 4. The poor match in the coefficients of thermal expansion between the framework base metal alloys and the veneer ceramics led to the development of leucite-containing feldspar ceramics in the 1960s. more control over the coefficient of thermal expansion of feldspathic porcelains and allowed the production of reliable ceramic to-metal frameworks. Composition Feldspar (60 to 80%) Basic glass former Kaolin (3 to 5 %) Binder Quartz (15 to 25%) Filler Alumina (8 to 20 %) Glass former and flux Oxides of sodium, potassium and Fluxes calcium (9 to 15%) Metal pigments (1300°C Medium fusing 1000°C- 1300°C Low fusing 850°C - 1000°C Ultra‐low fusing porcelains