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Dental Cement

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Dental Cement

  1. 1. Dental luting cement <ul><li>Bond Strength </li></ul><ul><li>Strength </li></ul><ul><li>Flow (viscosity) </li></ul><ul><li>Wetting </li></ul><ul><li>Film thickness (<25 microns ) </li></ul><ul><li>Solubility </li></ul><ul><li>Working,Setting time </li></ul><ul><li>Esthetic </li></ul>*Complication dr shabeel pn
  2. 2. Dental luting Cement <ul><li>Zinc phosphate </li></ul><ul><li>Polycarboxylate </li></ul><ul><li>Glass ionomer </li></ul><ul><li>RMGI cement </li></ul><ul><li>Resin cement </li></ul>
  3. 3. Zinc phosphate <ul><li>Over 100 yrs of clinical experience </li></ul><ul><li>Routine application </li></ul><ul><li>Post-op sensitivities </li></ul><ul><li>Low hardness </li></ul><ul><li>High solubility </li></ul><ul><li>pH </li></ul><ul><li>No bond with tooth </li></ul>
  4. 4. Polycarboxylate <ul><li>Molecular bonding to tooth substance (2MPa) </li></ul><ul><li>Cost </li></ul><ul><li>Low F ¯ release </li></ul><ul><li>Low post-op sensitivities </li></ul><ul><li>Low hardness </li></ul><ul><li>solubility </li></ul>
  5. 5. Glass ionomer <ul><li>Molecular bonding to tooth substance </li></ul><ul><li>F ¯ release </li></ul><ul><li>Cost-Eff. </li></ul><ul><li>Minimal dimentional change </li></ul><ul><li>Occa. post-op sensitivities </li></ul><ul><li>Sensitive to water </li></ul><ul><li>Limited application (ceramics) </li></ul>(High caries risk) (3-5MPa)
  6. 6. RMGI <ul><li>Molecular bonding to tooth substance </li></ul><ul><li>F ¯ release </li></ul><ul><li>Low solubility </li></ul><ul><li>Fewer post-op sensitivities </li></ul><ul><li>Application ? (ceramics,composite) </li></ul>(>10MPa)
  7. 7. Resin cement <ul><li>High adhesive quality (18-20MPa) </li></ul><ul><li>⇧ Retention </li></ul><ul><li>High hardness </li></ul><ul><li>Low solubility </li></ul><ul><li>All metal, ceramic,composite (indirect) </li></ul><ul><li>Occa. Post-op sensitivities </li></ul>
  8. 8. Adhesive quality <ul><li>Non-adhesive (zinc phosphate) </li></ul><ul><li>Micromechanical bonding (resin cement) </li></ul><ul><li>Molecular adhesion (polycarboxylate,GI,RMGI) </li></ul>
  9. 9. Dental Cement <ul><li>Zinc phosphate </li></ul><ul><li>Polycarboxylate </li></ul><ul><li>Glass ionomer </li></ul><ul><li>RMGI cement </li></ul><ul><li>Resin cement </li></ul>Conventional Adhesive
  10. 10. Advantage conventional cement <ul><li>Easy handling </li></ul><ul><li>Moisture tolerance </li></ul><ul><li>No pre-Tx steps </li></ul><ul><li>Routine for metal base </li></ul>
  11. 11. Advantage resin cement <ul><li>Excellent mechanical properties </li></ul><ul><li>High bond strength with pre-Tx step </li></ul><ul><li>High aesthetics/translucency </li></ul><ul><li>Suitable for Ceramic, Porcelain, Composite,Metal </li></ul>
  12. 12. Resin cement <ul><li>Matrix </li></ul><ul><li>Primer </li></ul><ul><li>Filler </li></ul><ul><li>Coupling agent </li></ul>
  13. 13. Resin cement <ul><li>Matrix - Dimethacrylate </li></ul><ul><li>Primer- Dicrylate </li></ul><ul><li>Filler - Quartz, silica </li></ul><ul><li>Coupling agent- Silane dimethacrylate </li></ul>
  14. 14. <ul><li>Total etch Rely X ARC , Variolink II ,Calibra ,C&B </li></ul><ul><li>Self-etch Panavia F </li></ul><ul><li>Self-Adhesive Rely X Unicem </li></ul>Resin cement
  15. 15. Adhesion <ul><li>Dentin/enamel (micromachanical bond) </li></ul><ul><li>Porcelain (hydrofluoric acid,Ammoniumfluoride acid)+ silane </li></ul><ul><li>Metal (sandblasting)(metal bonding adhesive) </li></ul><ul><li>Fiber post </li></ul>
  16. 16. Adhesion <ul><li>Dentin/enamel (micromachanical bond) </li></ul><ul><li>Porcelain (hydrofluoric acid,Ammoniumfluoride acid)+ silane </li></ul><ul><li>Metal (sandblasting)(metal bonding adhesive) </li></ul><ul><li>Fiber post </li></ul>
  17. 17. Adhesion <ul><li>Dentin/enamel (micromachanical bond) </li></ul><ul><li>Porcelain (hydrofluoric acid,Ammoniumfluoride acid)+ silane </li></ul><ul><li>Metal (sandblasting)(metal bonding adhesive) </li></ul><ul><li>Fiber post </li></ul>
  18. 18. Adhesion <ul><li>Dentin/enamel (micromachanical bond) </li></ul><ul><li>Porcelain (hydrofluoric acid,Ammoniumfluoride acid)+ silane </li></ul><ul><li>Metal (sandblasting)(metal bonding adhesive) </li></ul><ul><li>Fiber post </li></ul>
  19. 19. Why are fiber post? <ul><li>Clinical success rate: Less root fracture than with metal posts: Dentine-like flexural strenght avoids the “wedge” effect of stiff and hard metal posts. </li></ul>metal fiber post <ul><li>Esthetics : the new post is translucent and does not shine through ceramic or composite restorations </li></ul><ul><li>3. Easy and conservative removal with drills if endodontic re-treatment is required </li></ul>further advantages : no corrosion, easy cutting of over-length, light-translucent... root fracture! no local peak forces, no root fracture
  20. 20. Resin cement <ul><li>Bond strength > Zinc phosphate 10 times </li></ul><ul><li>↑ Retention </li></ul><ul><li>Reinforced ceramic - base Crown </li></ul><ul><li>Adhesive system (micromachanical bond-tooth) </li></ul><ul><li>(chemical bond-porcelain,metal) </li></ul><ul><li>Low solubility </li></ul><ul><li>↓ leakage </li></ul>
  21. 21. Pre-treatment procedure
  22. 22. Pre-treatment procedure
  23. 23. Pre-treatment procedure
  24. 24. Polymerization <ul><li>Light-cured/Dual cure (2 vials - Base,Catalyst) </li></ul><ul><li>Self cure/auto cure </li></ul><ul><li>Dual cure </li></ul>
  25. 25. Adhesion <ul><li>Dentin/enamel (micromachanical bond) </li></ul><ul><li>Porcelain (hydrofluoric acid,Ammoniumfluoride acid)+ silane </li></ul><ul><li>Metal (sandblasting)(metal bonding adhesive) </li></ul><ul><li>Fiber post </li></ul>Adhesive cement bonding to tooth ,alloy structure
  26. 26. <ul><li>Anesthetic </li></ul><ul><li>Isolate (pack cord) </li></ul><ul><li>Light cure 2-3 sec </li></ul><ul><li>Include 3-5 shades,silane </li></ul><ul><li>Remove solvent- can inhibit setting of resin cement </li></ul><ul><li>Excess bonding – poor fit,low strength </li></ul><ul><li>Temp NE </li></ul>Clinical Tips
  27. 27. Shade <ul><li>Opaque – veneer + Tetracycline </li></ul><ul><li>Clear (translucent) </li></ul><ul><li>Vita shade </li></ul>

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