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Ceramics for dental use

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Ceramics for dental use

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Ceramics for dental use

  1. 1. ICB Dental Schoolclassification of ceramics for dental use Dra. Analy Solano Zaragoza Dr. Alfredo Nevárez Rascón
  2. 2. Ceramics  Formed from inorganic nature nonmetals, which are obtained by the action of heat and whose final structure is partially or completely crystalline. FIG 1: http://www.google.com.mx/imgres?q= feldespato Main components: • Feldspar (81%) • Quartz (15%) • kaolin (4%) FIG 2: http://www.google.com.mx/imgres?q=cuarzo •Metal oxides FIG 3:http://www.google.com.mx/imgres?q=caolin
  3. 3. Feldspar When broken glass, is responsible for the translucency of porcelain.  Serve as a matrix of quartz  Melts at 1300 C  Tends to react with heat, spent time distorting the piece turn white and shade. FIG 4: http://www.google.com.mx/imgres?q=feldespato
  4. 4. The quartz Constitutes the crystalline face Hardening of the massIs used as filler
  5. 5. The kaolin Increases the ability of the porcelain mold before baking Reacts with the feldspar and gives rigidity  Facilitates mixing with water while maintaining the form during drying and firing. FIG 5: Mat Caolin http://www.google.com.mx/imgres?q=caolin
  6. 6. Metal oxides  Copper: green  Cobalt: blue  Titanium: yellow-brown  Magnesium lavender blue Zirconium, titanium and tin: opacacidad  Iron oxide: brown
  7. 7. Majority of dentalceramics: Have a mixed structure. Formed by a glassy matrix (whose atoms are disordered). Massive particles are more or less large crystallized minerals (whose atoms are arranged uniformly if). FIG 6 http://scielo.isciii.es/pdf/rcoe/v12n4/revision1.pdf
  8. 8. Classification by chemical composition.Feldspathic ceramics:composition. feldspar: translucency Quartz: Crystalline The kaolin: confer plasticity and facilitates the management of the ceramic when not yet sintered.FEATURES: Excellent optical properties Relative fragile. FIG 7 : Mainly used for coating metal http://www.google.com.mx/imgres?q=ceramicas+f or ceramic structures. eldespaticas
  9. 9. PROPERTIES OF feldspathic  Greater resistance.  Contain the quartz and kaolin Ceramic mass incorporated elements that increase the mechanical strength
  10. 10. Zirconia Ceramics  In1965, Hughes joined M cLean and feldspathic porcelain quantities of aluminum oxide by reducing the proportion of quartz.  Improved toughness.  Exceeds 50% alumina is produced a significant increase in opacity
  11. 11.  Composed of highly sintered zirconia (95%), partially stabilized with yttrium oxide (5%).  High toughness by the crystalline microstructure  Opaque (no glassy phase)  Main structure for the core of the restoration. FIG 8: Diferencie http://www.google.com.mx/imgres?q=ceramicas+zirconi o
  12. 12. vitro ceramic  Molded to desired shape.  Translucent glassy a esthetic.  Fragile.  Manufacture in glassy state, non- FIG 9: crystalline and is subsequentlyhttp://www.google.com.mx/imgres?q=vitroceramicas converted to the crystalline state by heat treatment.
  13. 13. Classification according to the preparation technique Refractory dye and Condensation Design model of primary impression resistant, to dimensional changes during the heat treatment.  porcelain is applied to refractory models to sintered  And final corrections. FIG 11: FIG 10: http://www.google.com.mx/imgres?q=mu%C3%http://www.google.com.mx/imgres?q=mu B1%C3%B3n+refractario %C3%B1%C3%B3n+refractario
  14. 14. Replacing a lost wax technique  Waxed the pattern which may be the inner cap or full restoration introduced i Fig 12: nto a cylinder andhttp://www.google.com.mx/imgres?q=cera+p%C 3%A9rdida+de+uso+odontologico calcined wax.  The ceramic is heated to its melting point  Ceramic injection is pushes it into the mold. Fig 13: http://www.google.com.mx/imgres?q=cera
  15. 15. Computer-assisted technologyComposed of 3 phases:scanning, design and machining. Scanning: Recorded three- dimensional by using cameras or sapphire tip. Design: In the computer using specialized software. Machining: milling in a unit that transfers the dimensions of Fig 14: CAD CAM the software and http://metal-engravings.com/metal- engraving/cad-cam-2.html makes the model.
  16. 16. ADVANTAGES DISADVANTAGES• Translucency • Low resisteance to the impact• Chemical Stability • Low tencional resisteance• Thermal expansion • Fragilcoefficient close to the tooth• Biocompatibility • Porosity• High compressive strength and • Contractionabrasion.• Good marginal fit
  17. 17. Trade marcs  DC-Zircon  In- Ceram YZ  Lava (3M Espe)  Biodent (dentsply)  Cerinat ( Dent- mat) Ceramco ll ( Ceramco)  Fortune ( Williams)
  18. 18. LITERATURE http://www.slideshare.net/criztiam/ceramicas-dentales- 5562646 http://scielo.isciii.es/pdf/rcoe/v12n4/revision1.pdf http://www.densplay.com/default.pk?tsearch=clasificacio n+de+las+ceramicas+de+uso+odontologico&x=0&y=0

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