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