Glass ceramics dental materials


Published on

Glass ceramics dental materials

Published in: Education, Business, Technology
1 Comment
  • je suis a la recherche des documentations en rapport avec la structure fondamentale de la poudre utilisee en ceramique.

    What are the advanatage et disadvantages of the slip-casting
    Are you sure you want to  Yes  No
    Your message goes here
No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

Glass ceramics dental materials

  1. 1. Institute of Biomedical Sciences Glassceramics as dental materialsDra. Laura Berenice Hernandez SosaDr.: Alfredo Nevárez Rascón Fig.#1
  2. 2. HistoryIn the 60s, there was a qualitative leap in ceramic dentalrestorations from Pat Weinstein et al (1962) proposing thesystem leucite-feldspar glass for restorations. Despiteprogress, improvements can be throw in the followingareas: mechanical properties of restorations: Becausecomposite restorations are to have different phases wherethe coefficients of thermal expansion and even thecrystalline phase martensitic transformations can occur atlow temperatures, cracks appear between crystals andmatrix or within the crystals.
  3. 3. Classification of metal-free ceramicaccording to their composition can be classified into:o Silicate-based ceramico Ceramic oxideso Ceramic oxides noto Vitroceramics
  4. 4. ARE THEY?crystallized materials are created by nucleation and growth of crystals inthe glass matrix.ceramics treated with a special procedure that gives high hardness andmakes it very resistant to heat and sudden temperature changes Basic components  Sílice  Aluminum
  5. 5. The glass ceramic is a material that is molded to thedesired shape as a crystal, then subjected to a heattreatment to induce a devitrification. Fig.#2
  6. 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. Fig.#3s/DigitalDentistry/DentalTechnician/LavaMaterials/DentalCeramics/
  7. 7. The ceramic material can be obtained by different processingmethods, can be melted, drain, infiltrate and turning accordingto the method or way of working it further classification of thematerial arise most recent or current Fig.#4 index/digitalsolutions/cadcam/prosthetics/materials-ips-emax.htm
  8. 8. There are 3 typesCeramic castingInjected or pressed ceramicGlass infiltrated ceramicTorneables ceramic or fresables
  9. 9. Ceramic castingAn example of such porcelain crystal is a product based onthe growth of crystals in the glass matrixcrystalline porcelain is a product based on the crystal growthin the matrix flourmicatetrasilica virdio Fig.#5
  10. 10. Injected or pressed ceramicare the highest content of leucine and its presentation isusually in glass ingots soften with heat and mass are injectedinto a mold prior apartir of a pattern. is then colored orotherwise coated with porcelain synthesized.Firg.#6
  11. 11. Glass infiltrated ceramicare higher alumina content (85%) for both high flexural strengthof over 8500-630 MPa) as may be indicated not only for crownsbridges but also to previous small. Fig.#7
  12. 12. Torneables ceramic or fresablesThese systems were initially used for the manufacture of crown and bridgestructures below: composite with titanium coated with low fusionporcelain. At present, porcelain, feldspathic or hotpl are cut or machinedwithout chipping or fracture on blocks suitable for the size of therestoration.They are presented as machinable blocks designed for processing incomputer-aided systems. CAD / CAMfit your clothing are 3 groups: condensation on refractory dye, situationlost wax wing, and computer-assisted technology. Fig.#8
  13. 13. Modeling in CompressionThis method uses a piston to cause the ceramic hot, passingthrough a hot tube and from there to a mold where theresulting ceramic is cooled and adopts the shape of the mold.Fig.#9
  14. 14. Trademarks IPS Empress Dicor Cerfestore Hi-Ceram In-Ceram Optec hsp Fig.#9
  15. 15. IPS EMPRESS S EMPRESSCeramic administered as enucleated ingots areheated and compressed until it flows into a mold Fg.#10 bih=612&tbm=isch&tbnid=UnwHEI9h3QwGAM:&imgrefurl=
  16. 16. Advantage DisadvantagesLack of metal Fractures in posterior areasResistance to bendingExcellent fit and aesthetics
  17. 17. DICORPorcelain is a casting which can be shaped to form an inlay, a veneer or acrown total coating a casting process using the lost wax method similar tothat used for metals. Fig.#11
  18. 18. Advantage DisadvantagesEase of manufacture Limited use in air where there was little tensionaesthetics They could be massaged internallyGood marginal fitFlexural moderately highLow abrasion on tooth enamel
  19. 19. Biography Fg. #12