All ceramic restorations
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Transcript of All ceramic restorations
ALL CERAMIC RESTORATIONS
BY:Hrudi Sundar Sahoo
Meenakshi Ammal Dental college, Chennai
Contents
Introduction Constituents Classification Advancements in Ceramic Dentistry In-Ceram Tooth preparation Laboratory processing Cementation and finishing
Introduction
Non-crystalline glasses composed of structural units of silicon and oxygen (SiO4 tetrahedra).
Most esthetic fixed restorations. Highly desirable esthetic
properties.
Constituents
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.
Classification
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)
Advancements In Ceramic Dentistry
All ceramic crown- PJC by Land [1886] PJC with inner core of aluminous
porcelain Twin Foil Technique Castable glass ceramics Shrink Free Ceramic crown IPS Empress In-Ceram
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.
Tooth Preparation
Laboratory Processing
Cementation and Finishing Of All-Ceramic Restorations
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.
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