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t able of contents

t able of contents. high strength ceramics s olutions provisional s olutions. w hat are modern h igh s trength c eramics?. l ithium d isilicate ( e.Max ) z irconia

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t able of contents

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  1. table of contents high strength ceramics solutions provisional solutions

  2. what are modern high strength ceramics? • lithium disilicate (e.Max) • zirconia “A factor critical to the strength and abrasiveness of ceramic materials is how the clinician adjusts, grinds, and polishes the ceramic restoration on delivery and cementation.” – John A. Sorensen, DMD, PhD, FACP

  3. modernceramics • “…there is no correlation between the hardness of a ceramic and the potential abrasion of natural tooth structure.” – Sorensen • microscopic surface roughness of the ceramic = abrasion • finer the grain structure = lower the wear • finer the grain structure = the more polishable • zr/ld = Finest Grain Structure

  4. zirconia~1200MPa lithium disilicate ~400MPa • pressed or milled • strongest • opaque • substructure or monolithic • pressed, milled or layered • second strongest • translucent • can be pressed within 2/10ths mm for anterior restorations (veneers)

  5. zirconia~1200MPa lithium disilicate ~400MPa • BruxZir(Glidewell) • Lava Zirconia (3M ESPE) • Cercon(Dentsply) • In-Ceram (Vita) • Zirlux (Zahn) e.Max (IvoclarVivadent)

  6. solutions • occlusal • low RPM, low pressure • 100K RPM • anatomy • low RPM, low Pressure • 100K RPM

  7. solutions heat = micro fractures heatless grinder for adjustment (Max 240°F)

  8. solutions • LD Grinders • pink medium recommended for Lithium Disilicate • Green Coarse recommended for Zirconia • DialiteDiamonds • adjust/removal • removal, provided copious amounts of water, 100K rpm and light, steady touch

  9. ZR LD

  10. provisional Tips and techniques tips & techniques

  11. composite provsionalBisAcryil acrylic provisonal methayl/methacrylate • Protemp (3M ESPE) • Luxatemp (DMG-America) • Venus (Heraeus) Snap (Lang Dental) Jet (Parkell)

  12. problem: messy pumice + ragwheel

  13. solution: 2-step polish – no rag wheel • minimal heat • no pastes or compounds needed #1: medium pre polish #2 fine high shine

  14. other uses • Night guards • Splints • Flippers • Dentures • Orthodontic Retainers

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