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Glass ceramics dental materials
- 1. Institute of Biomedical Sciences Glassceramics as dental materials Dra. Laura Berenice Hernandez Sosa Dr.: Alfredo Nevárez Rascón Fig.#1
- 2. History In the 60's, there was a qualitative leap in ceramic dental restorations from Pat Weinstein et al (1962) proposing the system leucite-feldspar glass for restorations. Despite progress, improvements can be throw in the following areas: mechanical properties of restorations: Because composite restorations are to have different phases where the coefficients of thermal expansion and even the crystalline phase martensitic transformations can occur at low temperatures, cracks appear between crystals and matrix or within the crystals.
- 3. Classification of metal-free ceramic according to their composition can be classified into: o Silicate-based ceramic o Ceramic oxides o Ceramic oxides not o Vitroceramics
- 4. ARE THEY? crystallized materials are created by nucleation and growth of crystals in the glass matrix. ceramics treated with a special procedure that gives high hardness and makes it very resistant to heat and sudden temperature changes Basic components Sílice Aluminum
- 5. The glass ceramic is a material that is molded to the desired shape as a crystal, then subjected to a heat treatment to induce a devitrification. Fig.#2 http://www.sonrisasradiantes.com/tag/hi-ceram/
- 6. When the object has solidified, the mold refractory (lining) is broken into pieces and removed the piece of pottery. Then the asperities are filed, are made up and glasean or is coated with one or more layers of a thermally compatible porcelain. http://solutions.productos3m.es/wps/portal/3M/es_ES/3M_ESPE/DentalManufacturers/Product Fig.#3 s/DigitalDentistry/DentalTechnician/LavaMaterials/DentalCeramics/
- 7. The ceramic material can be obtained by different processing methods, can be melted, drain, infiltrate and turning according to the method or way of working it further classification of the material arise most recent or current Fig.#4 http://www.straumann-cares-digital-solutions.com/es/com- index/digitalsolutions/cadcam/prosthetics/materials-ips-emax.htm
- 8. There are 3 types Ceramic casting Injected or pressed ceramic Glass infiltrated ceramic Torneables ceramic or fresables
- 9. Ceramic casting An example of such porcelain crystal is a product based on the growth of crystals in the glass matrix crystalline porcelain is a product based on the crystal growth in the matrix flourmicatetrasilica virdio Fig.#5 http://www.verboweb.com.ar/caracteristicas.htm
- 10. Injected or pressed ceramic are the highest content of leucine and its presentation is usually in glass ingots soften with heat and mass are injected into a mold prior apartir of a pattern. is then colored or otherwise coated with porcelain synthesized. Firg.#6 http://www.verboweb.com.ar/caracteristicas.htm
- 11. Glass infiltrated ceramic are higher alumina content (85%) for both high flexural strength of over 8500-630 MPa) as may be indicated not only for crowns bridges but also to previous small. Fig.#7 http://www.verboweb.com.ar/caracteristicas.htm
- 12. Torneables ceramic or fresables These systems were initially used for the manufacture of crown and bridge structures below: composite with titanium coated with low fusion porcelain. At present, porcelain, feldspathic or hotpl are cut or machined without chipping or fracture on blocks suitable for the size of the restoration. They are presented as machinable blocks designed for processing in computer-aided systems. CAD / CAM fit your clothing are 3 groups: condensation on refractory dye, situation lost wax wing, and computer-assisted technology. Fig.#8 http://scielo.isciii.es/scielo.php?script=sci_arttext&pid=S1138-123X2003000500005
- 13. Modeling in Compression This method uses a piston to cause the ceramic hot, passing through a hot tube and from there to a mold where the resulting ceramic is cooled and adopts the shape of the mold. Fig.#9 http://www.verboweb.com.ar/caracteristicas.htm
- 14. Trademarks IPS Empress Dicor Cerfestore Hi-Ceram In-Ceram Optec hsp Fig.#9 http://www.google.com.mx/imgres?q=ips+empress&num=10&hl=es&gbv=2&biw=1024&bih=612&tbm=isch&tbnid=Un wHEI9h3QwGAM:&imgrefurl=
- 15. IPS EMPRESS S EMPRESS Ceramic administered as enucleated ingots are heated and compressed until it flows into a mold Fg.#10 http://www.google.com.mx/imgres?q=ips+empress&num=10&hl=es&gbv=2&biw=1024& bih=612&tbm=isch&tbnid=UnwHEI9h3QwGAM:&imgrefurl=
- 16. Advantage Disadvantages Lack of metal Fractures in posterior areas Resistance to bending Excellent fit and aesthetics
- 17. DICOR Porcelain is a casting which can be shaped to form an inlay, a veneer or a crown total coating a casting process using the lost wax method similar to that used for metals. Fig.#11 http://scielo.isciii.es/pdf/rcoe/v8n5/525%20Caracteristicas.pdf
- 18. Advantage Disadvantages Ease of manufacture Limited use in air where there was little tension aesthetics They could be massaged internally Good marginal fit Flexural moderately high Low abrasion on tooth enamel