Glass Ceramic Dental Materials

The attempts of developing glass ceramics with higher strength through chemical composition modification and optimization of the manufacturing process have never ended.

Glass ceramic dental materials. Moreover glass ceramics exhibit special properties that are characteristic of both glass and ceramic materials. 1984 dentsply international york pa usa. A typical metal free glass ceramic of the leucite type is ips empress ivoclar vivadent ag. Glass ceramics are polycrystalline materials produced through controlled crystallization of base glass.

However clinical assessment is required to give reliable recommendations for dental practitioners. 4 dicor was first available as a castable glass ceramic ingot for manufacture in the lab using the lost wax technique and later also as a. Glass ceramics are multiphase materials consisting of at least one glass phase and one crystalline phase. Ceramics containing high amounts of leucite glass or optimal pressable ceramics were initially used for this process.

Castable glass ceramics heat pressed glass ceramics and machinable glass ceramics are also used in dentistry. The dental technician has three processing options available when working with this glass ceramic. 8 a commonly used technique involves waxing the restoration to full contour and then hot pressing to yield a restoration. Glass ceramics are manufactured from base glasses using the mechanisms of controlled nucleation and crystallisation 25 26.

Was the first company to fabricate glass ceramic material for dental restorations 4 9. Ic glass ceramic revealed lower brittleness index compared with vs glass ceramic and hence ic glass ceramic may have superior machinability. These are known as dental ceramics. Glass ceramic materials share many properties with both glasses and ceramics glass ceramics have an amorphous phase and one or more crystalline phases and are produced by a so called controlled crystallization in contrast to a spontaneous crystallization which is usually not wanted in.

Moulding with the so called empress technology sintering ips empress layering materials and machining ips procad ips empress cad. The first dental glass ceramic derived from the research of corning glass works was a fluormica glass ceramic with a flexural strength of 150 mpa dicor. For certain dental prostheses such as three unit molars porcelain. Crystalline minerals include feldspar quartz and alumina and perhaps kaolin as glass matrix 1 10 11.

Dicor is the first castable glass ceramic developed for ceramic crown restoration. The detailed composition of dental ceramics was discussed in table 2. In 1984 corning inc. According to weibull distribution vs glass ceramic appears to be reliable for clinical use.

Dental porcelain also known as dental ceramic is a dental material used by dental technicians to create biocompatible lifelike dental restorations such as crowns bridges and veneers evidence suggests they are an effective material as they are biocompatible aesthetic insoluble and have a hardness of 7 on the mohs scale. 9 05 7 2 new dental ceramics.