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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. Esthetically superior to metal
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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 • Esthetically superior to metal • Ease of repair
Disadvantages • Dimensional stability - warpage • Lower strength/wear resistance than metal • Porous - hygiene • Low thermal conductivity
Metal Bases • Small edentulous spaces • no room for gridwork • Less esthetic (metal show through)
Advantages • Thermal conductivity • Swallowing hot substances • Improved thermal perception
Advantages • Accuracy & Dimensional Stability • Minimal warpage (casting imbibtion) • Minimal need for posterior palatal seal • Minimal abrasion
Advantages • Hygiene • Metal less porous than resin • Less food, plaque & calculus accumulation
Advantages • Weight and Bulk • Metal bases can be cast thinner than resin bases while maintaining adequate strength
Flange Extension • Tooth- tissue supported partial dentures • Extend maximally for support & retention • No overextension or impingement on movable border tissues
Flange Extension • Class I & II RPD’s • Posterior extension same as a complete denture • Hamular notches, retromolar pads
Flange Extension • Soft Tissue Undercuts
Acrylic Resin Finish Lines • Internal & external finish lines should not coincide
Replacement Teeth • Acrylic denture teeth • Cause less attrition than porcelain • Easier to arrange, modify & adjust
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
Video Clips • Cl III Path of Insertion • Cl IV Path of Insertion