BY: Hrudi Sundar SahooMeenakshi Ammal Dental college, Chennai
Introduction Constituents Classification Advancements in Ceramic Dentistry In-Ceram Tooth preparation Laboratory processing Cementation and finishing
Non-crystalline glasses composed of structural units of silicon and oxygen (SiO4 tetrahedra). Most esthetic fixed restorations. Highly desirable esthetic properties.
Major components: Feldspar, Quartz, Kaolin Other components: Oxides of sodium, Potassium, Calcium, Aluminium, Magnesium, Lithium etc. For colours: Oxides of Indium, Chromium, Tin, Iron, Cobalt, Cerium.
Based on firing temperature: 1. High-fusing: 1,290 to 1,370°C (2,350 to 2.500T) 2. Medium-fusing: 1,090 to 1,260cC (2,000 to 2.300T ) 3. Low-fusing: 870 to 1,065DC (1,600 to 1,950°F)
All ceramic crown- PJC by Land  PJC with inner core of aluminous porcelain Twin Foil Technique Castable glass ceramics Shrink Free Ceramic crown IPS Empress In-Ceram
Introduced by Sadoun (1985) Core material is alumina Manufactured by Slip casting, sintering, Glass absorption. Conventional porcelain applied to the core to give final contour and colour. Greater compressive strength than IPS Empress but lesser than Metal ceramic. Recommended for short span three unit anterior FPD.
Ceramic crowns may be cemented with zinc phosphate, glass ionomer. or a dual- polymerizing resin cement such as Enforce with Fluoride. Ceramic crowns that have been etched internally and bonded with a composite resin cement are 50% stronger than similar crowns cemented with zinc phosphate cement.