Dicor and cerestore /certified fixed orthodontic courses by Indian dental academy


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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

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Dicor and cerestore /certified fixed orthodontic courses by Indian dental academy

  1. 1. DICOR AND CERESTORE INDIAN DENTAL ACADEMY Leader in Continuing Dental Education www.indiandentalacademy.com
  2. 2. • Ceramics are usually defined in terms of what they are not : nonmetallic (not metals) and inorganic (not resins).• To distinguish them from rocks and minerals, the vast majority of which are also inorganic and nonmetallic, ceramics are additionally defined as man-made solid objects formed by baking raw materials (minerals) at high temperatures.• The term "ceramics" is derived from the Greek word "keramos" meaning "burnt stuff." www.indiandentalacademy.com
  3. 3. • CERAMICS : compounds of one or more metals with a nonmetallic element, usually oxygen. They are formed of chemical and biochemical stable substances that are strong, hard, brittle, and inert nonconductors of thermal and electrical energy. www.indiandentalacademy.com
  4. 4. • PORCELAIN: a ceramic material formed of infusible elements joined by lower fusing materials. www.indiandentalacademy.com
  5. 5. • Porcelain. A specific type of ceramic widely used for nearly 3,000 years, traditional porcelain is composed of blends of three naturally occurring minerals: – pure white clay, – quartz and – feldspar. www.indiandentalacademy.com
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  7. 7. • Ceramics can be classified in four categories – Silicate ceramics Impractical for dentistry An amorphous glass phase with a Presence of mainly oxides (Al2O3,MgO, Partially crystallized glasses that are high processing temp porous structure – Oxide ceramics produced by nucleation phase or Main component is glass and growth etc with either noSiO unaesthetic 2 color Of Crystals in the glass phase .phase. Small content of glass matrix Dental porcelain fall in this category & opacity – Non-oxide ceramics – Glass ceramics www.indiandentalacademy.com
  8. 8. CLASSIFICATION• ACCORDING TO TYPE: – Feldspathic porcelain – Aluminous porcelain – Glass infiltrated aluminous – Glass infiltrated spinel – Glass ceramics www.indiandentalacademy.com
  9. 9. • ACCORDING TO FIRING TEMPERATURE: – High fusing > 13000 c – Medium fusing 11010 –13000 C – Low fusing 850 – 11010 C – Ultra low fusing <8500 C. www.indiandentalacademy.com
  10. 10. • According to Substructure material – Glass ceramic – CAD- CAM porcelain – Sintered ceramic core www.indiandentalacademy.com
  11. 11. According to the technique of Fabrication• 1. Conventional powder slurry system – Medium fusing Felspathic porcelain – Aluminous porcelain – DUCERAM LFC (Degussa) – OPTEC HSP (Jeneric/Pentron) www.indiandentalacademy.com
  12. 12. • 2. Castable ceramics – Dicor – Cerapearl (Kyocera Inc.) www.indiandentalacademy.com
  13. 13. • 3. Pressable ceramics – IPS Empress I, II , cosmo, (Ivoclar) – Optec pressable ceramics (Jeneric/Pentron) – Cergo (Dentsply ) – VitaPress ( Vitadent ) www.indiandentalacademy.com
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  16. 16. • 4. Glass infiltrated ceramics – In-Ceram aluminia (Vident) – In-Ceram spinell (Vident) – In-Ceram zirconia (Vident) www.indiandentalacademy.com
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  18. 18. • 5. Injection molded ceramics – Alceram (Cerestore) www.indiandentalacademy.com
  19. 19. • 6. Machinable ceramics – CAD CAM • Cerec: Vita Mark I, Vita Mark II, • Dicor MGC( Machinable Glass Ceramic) • Procera • Cercon base • VitaBloc alumina , spinell & zirconia • Lava frame – Celay( coping milling ) www.indiandentalacademy.com
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  21. 21. CASTABLE CERAMICS• DICOR (Dentsply Int.)• CERA PEARL (Kyocera) www.indiandentalacademy.com
  22. 22. • Glass ceramic are composite materials of glassy matrix and a crystal phase . www.indiandentalacademy.com
  23. 23. • A glass -ceramic is material that is formed into the desired shape as a glass, then subjected to a heat treatment to induce partial devitrification (ie loss of glassy structure by crystallization of the glass). www.indiandentalacademy.com
  24. 24. • The crystalline particles, needles, or plates formed during this process serve to interrupt the propagation of cracks in the material when an intraoral force is applied, thereby causing increased strength and toughness. www.indiandentalacademy.com
  25. 25. • The use of glass-ceramics in dentistry was first proposed by MacCulloch in 1968. www.indiandentalacademy.com
  26. 26. • The first commercially available castable ceramic material for dental use, Dicor, was developed by Corning Glass Works and marketed by Dentsply International. www.indiandentalacademy.com
  27. 27. • Dicor system composed of SiO2; K2O. MgO, and MgF2. Small amounts of Al2.O3 and ZrO2 are added for durability and a fluorescing agent is added for esthetics.• Dicor contain Tetra silicic fluor mica Crystals• Lost wax casting technique is used , similar to that employed for metals.• Uses centrifugal casting machine www.indiandentalacademy.com
  28. 28. PROCEDUREwww.indiandentalacademy.com
  29. 29. • A burnout is done at 950 degree c .www.indiandentalacademy.com
  30. 30. • Crucible is loaded with ingot . • Platinum ,electrical resistance –type muffle mounted on a motor – driven straight centrifugal casting arm. • Casting temp – 13580cwww.indiandentalacademy.com
  31. 31. Glass subjected to heat treatment (1075 degree c for 10hrs) that causes microscopic plate like crystals ofcrystalline material (mica) to grow with in the glass matrixCrystallization-65%, crystal is Tetra silicic fluor micaCrystals www.indiandentalacademy.com
  32. 32. • This heat treatment (which involves crystal nucleation and crystal growth process) is known as "ceramming“. The crystals function in 2 ways: 1) They create a relatively opaque material out of initially transparent crown, www.indiandentalacademy.com
  33. 33. 2) they significantly increase the fractureresistance and strength of ceramic. Thesecrystals are also less abrasive to opposing toothstructure than the leucite crystals found intraditional feldspathic porcelains www.indiandentalacademy.com
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  38. 38. • Dicor is a glass, it is capable of producing a “Chameleon Effect” ( i.e. part of the colour of the restoration is picked up from the adjacent teeth as well as from the cement used for luting the restoration). www.indiandentalacademy.com
  39. 39. • Advantage : – Good marginal adaptation – Abrasiveness is same as that of the tooth – Chameleon effect www.indiandentalacademy.com
  40. 40. • Disadvantage: – Increased cost, – Increased time of fabrication. – When used for posterior crowns, ceramic crowns are most susceptible to fracture www.indiandentalacademy.com
  41. 41. • Instead of using stains, alternative technique is to cast the glass as a core and bake veneer shaded feldspathic porcelain over it. This is called as Willi’s glass.• Color can then be built in layers. www.indiandentalacademy.com
  42. 42. • Dentsply has introduced Dicor Plus which is a shaded feldspathic porcelain veneer applied to the Dicor substrate.• However as Dicor plus is a feldspathic porcelain that contain leucite , it is expected that these restorations will be as abrasive to teeth as other feldspathic porcelains www.indiandentalacademy.com
  43. 43. INJECTION MOLDED CERAMICS (ALCERAM-Cerestore)• Introduced by Coors Biomedical company in 1983• It employs a heat stable epoxy die and an aluminous core porcelain which is injection molded. www.indiandentalacademy.com
  44. 44. • By controlling the time and temperature of the firing cycle a shrink free ceramic system resulted. www.indiandentalacademy.com
  45. 45. • Wax up of ceramic core is done• Pattern sprued along with epoxy die• Investing done• Wax eliminated• Heated flowable ceramic is injected in the mold www.indiandentalacademy.com
  46. 46. • Normal veneering porcelain applied.• Cooled ceramic removed from die and fired for a period of 14 hrs. www.indiandentalacademy.com
  47. 47. • ADVANTAGE – Increased strength – Good marginal adaptation• DISADVANTAGE – Increased time www.indiandentalacademy.com