1. DENTURE BASES

2. Functions Support & retain denture teeth
Stress distribution - surface area
Improve esthetics

3. Materials
Acrylic Resin
Metal

4. Acrylic Resin Bases Most common type
Allows relining of the base to maintain mucosal support

5. Advantages
Esthetically superior to metal
Ease of repair

6. Disadvantages Dimensional stability - warpage
Lower strength/wear resistance than metal
Porous - hygiene
Low thermal conductivity

7. Metal Bases Small edentulous spaces Less esthetic (metal show through)
no room for gridwork
Less esthetic (metal show through)

8. Beaded Metal Base

9. Metal Filled Space

10. Retentive Posts

11. Advantages Thermal conductivity Swallowing hot substances
Improved thermal perception

12. Advantages Accuracy & Dimensional Stability
Minimal warpage (casting imbibtion)
Minimal need for posterior palatal seal
Minimal abrasion

13. Advantages Hygiene Metal less porous than resin
Less food, plaque & calculus accumulation

14. Advantages Weight and Bulk
Metal bases can be cast thinner than resin bases while maintaining adequate strength

15. Flange Extension Tooth- tissue supported partial dentures
Extend maximally for support & retention
No overextension or impingement on movable border tissues

16. Flange Extension Class I & II RPD’s
Posterior extension same as a complete denture
Hamular notches, retromolar pads

17. Flange Extension
Soft Tissue Undercuts

18. Acrylic Resin Finish Lines
Internal & external finish lines should not coincide

19. Replacement Teeth Acrylic denture teeth
Cause less attrition than porcelain
Easier to arrange, modify & adjust

20. 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

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