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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