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DENTURE BASES

Denture bases play a crucial role in supporting and retaining denture teeth, ensuring optimal stress distribution while enhancing aesthetics. Commonly made from acrylic resin, these bases can be easily relined and repaired, although they may suffer from dimensional instability and hygiene issues due to porosity. Metal bases, while providing better thermal conductivity and hygiene, are less aesthetic and may show through. Flange extensions are essential for support and retention, while proper denture tooth selection is vital for harmony and occlusion.

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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 • 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 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 • Extend maximally 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 Poor Occlusogingival Harmony Good Occlusogingival Harmony

  21. Video Clips • Cl III Path of Insertion • Cl IV Path of Insertion

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