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DENTURE BASES

DENTURE BASES. Functions. Support & retain denture teeth Stress distribution - surface area Improve esthetics. Materials. Acrylic Resin Metal. Acrylic Resin Bases. Most common type Allows relining of the base to maintain mucosal support. Advantages.

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DENTURE BASES

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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

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