DENTURE BASES Functions Support retain denture teeth Stress

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 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)

Beaded Metal Base

Metal Filled Space

Retentive Posts

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

Video Clips Cl III Path of Insertion Cl IV Path of Insertion