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