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DENTURE BASES - PowerPoint PPT Presentation


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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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Presentation Transcript
functions
Functions
  • Support & retain denture teeth
  • Stress distribution - surface area
  • Improve esthetics
materials
Materials
  • Acrylic Resin
  • Metal
acrylic resin bases
Acrylic Resin Bases
  • Most common type
  • Allows relining of the base to maintain mucosal support
advantages
Advantages
  • Esthetically superior to metal bases
  • Ease of repair
disadvantages
Disadvantages
  • Dimensional stability- warpage
  • Lower strength/wear resistance than metal
  • Porous - hygiene
  • Low thermal conductivity
metal bases
Metal Bases
  • Small edentulous spaces (no room for gridwork
  • Less esthetic (metal show through)
advantages11
Advantages
  • Thermal conductivity
    • Swallowing hot substances
    • Improved thermal perception
advantages12
Advantages
  • Accuracy & Dimensional Stability
    • Minimal warpage (casting imbibtion)
    • Minimal need for a posterior palatal seal
    • Minimal abrasion
advantages13
Advantages
  • Hygiene
    • Metal less porous than resin
    • Less food, plaque & calculus accumulation
advantages14
Advantages
  • Weight and Bulk
    • Metal bases can be cast thinner than resin bases while maintaining adequate strength
flange extension
Flange Extension
  • Tooth- tissue supported partial dentures should be maximally extended for support & retention
  • No overextension or impingement on movable border tissues
flange extension16
Flange Extension
  • Class I & II RPD’s
    • Posterior extension same as a complete denture
    • Hamular notches, retromolar pads
flange extension17
Flange Extension
  • Soft Tissue Undercuts
acrylic resin finish lines
Acrylic Resin Finish Lines
  • Internal & external finish lines should not coincide
replacement teeth
Replacement Teeth
  • Acrylic denture teeth
    • Cause less attrition than porcelain
    • Easier to arrange, modify & adjust
replacement teeth20
Replacement Teeth
  • Tooth Form
    • Harmonize with adjacent teeth
    • Shade, shape, length, width & occlusal form
    • Occlusion almost always requires adjustment