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  • 1. DENTURE BASES
  • 2. Functions
    • Support & retain denture teeth
    • Stress distribution - surface area
    • Improve esthetics
  • 3. Materials
    • Acrylic Resin
    • Metal
  • 4. Acrylic Resin Bases
    • Most common type
    • Allows relining of the base to maintain mucosal support
  • 5. Advantages
    • Esthetically superior to metal bases
    • Ease of repair
  • 6. Disadvantages
    • Dimensional stability- warpage
    • Lower strength/wear resistance than metal
    • Porous - hygiene
    • Low thermal conductivity
  • 7. Metal Bases
    • Small edentulous spaces (no room for gridwork
    • Less esthetic (metal show through)
  • 8. Beaded Metal Base
  • 9. Metal Filled Space
  • 10. Retentive Posts
  • 11. Advantages
    • Thermal conductivity
      • Swallowing hot substances
      • Improved thermal perception
  • 12. Advantages
    • Accuracy & Dimensional Stability
      • Minimal warpage (casting imbibtion)
      • Minimal need for a posterior palatal seal
      • Minimal abrasion
  • 13. Advantages
    • Hygiene
      • Metal less porous than resin
      • Less food, plaque & calculus accumulation
  • 14. Advantages
    • Weight and Bulk
      • Metal bases can be cast thinner than resin bases while maintaining adequate strength
  • 15. Flange Extension
    • Tooth- tissue supported partial dentures should be maximally extended for support & retention
    • No overextension or impingement on movable border tissues
  • 16. Flange Extension
    • Class I & II RPD’s
      • Posterior extension same as a complete denture
      • Hamular notches, retromolar pads
  • 17. Flange Extension
    • Soft Tissue Undercuts
  • 18. Acrylic Resin Finish Lines
    • Internal & external finish lines should not coincide
  • 19. Replacement Teeth
    • Acrylic denture teeth
      • Cause less attrition than porcelain
      • Easier to arrange, modify & adjust
  • 20. Replacement Teeth
    • Tooth Form
      • Harmonize with adjacent teeth
      • Shade, shape, length, width & occlusal form
      • Occlusion almost always requires adjustment
  • 21. Replacement Tooth Modification
  • 22. Occlusal Scheme
    • Varies from fully balanced (opposing a complete denture), to anterior disclusion
    • As more of the occlusal table is involved, the more a balanced occlusal scheme may be of benefit