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08. Denture Bases.ppt


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08. Denture Bases.ppt

  2. 2. Functions <ul><li>Support & retain denture teeth </li></ul><ul><li>Stress distribution - surface area </li></ul><ul><li>Improve esthetics </li></ul>
  3. 3. Materials <ul><li>Acrylic Resin </li></ul><ul><li>Metal </li></ul>
  4. 4. Acrylic Resin Bases <ul><li>Most common type </li></ul><ul><li>Allows relining of the base to maintain mucosal support </li></ul>
  5. 5. Advantages <ul><li>Esthetically superior to metal bases </li></ul><ul><li>Ease of repair </li></ul>
  6. 6. Disadvantages <ul><li>Dimensional stability- warpage </li></ul><ul><li>Lower strength/wear resistance than metal </li></ul><ul><li>Porous - hygiene </li></ul><ul><li>Low thermal conductivity </li></ul>
  7. 7. Metal Bases <ul><li>Small edentulous spaces (no room for gridwork </li></ul><ul><li>Less esthetic (metal show through) </li></ul>
  8. 8. Beaded Metal Base
  9. 9. Metal Filled Space
  10. 10. Retentive Posts
  11. 11. Advantages <ul><li>Thermal conductivity </li></ul><ul><ul><li>Swallowing hot substances </li></ul></ul><ul><ul><li>Improved thermal perception </li></ul></ul>
  12. 12. Advantages <ul><li>Accuracy & Dimensional Stability </li></ul><ul><ul><li>Minimal warpage (casting imbibtion) </li></ul></ul><ul><ul><li>Minimal need for a posterior palatal seal </li></ul></ul><ul><ul><li>Minimal abrasion </li></ul></ul>
  13. 13. Advantages <ul><li>Hygiene </li></ul><ul><ul><li>Metal less porous than resin </li></ul></ul><ul><ul><li>Less food, plaque & calculus accumulation </li></ul></ul>
  14. 14. Advantages <ul><li>Weight and Bulk </li></ul><ul><ul><li>Metal bases can be cast thinner than resin bases while maintaining adequate strength </li></ul></ul>
  15. 15. Flange Extension <ul><li>Tooth- tissue supported partial dentures should be maximally extended for support & retention </li></ul><ul><li>No overextension or impingement on movable border tissues </li></ul>
  16. 16. Flange Extension <ul><li>Class I & II RPD’s </li></ul><ul><ul><li>Posterior extension same as a complete denture </li></ul></ul><ul><ul><li>Hamular notches, retromolar pads </li></ul></ul>
  17. 17. Flange Extension <ul><li>Soft Tissue Undercuts </li></ul>
  18. 18. Acrylic Resin Finish Lines <ul><li>Internal & external finish lines should not coincide </li></ul>
  19. 19. Replacement Teeth <ul><li>Acrylic denture teeth </li></ul><ul><ul><li>Cause less attrition than porcelain </li></ul></ul><ul><ul><li>Easier to arrange, modify & adjust </li></ul></ul>
  20. 20. Replacement Teeth <ul><li>Tooth Form </li></ul><ul><ul><li>Harmonize with adjacent teeth </li></ul></ul><ul><ul><li>Shade, shape, length, width & occlusal form </li></ul></ul><ul><ul><li>Occlusion almost always requires adjustment </li></ul></ul>
  21. 21. Replacement Tooth Modification
  22. 22. Occlusal Scheme <ul><li>Varies from fully balanced (opposing a complete denture), to anterior disclusion </li></ul><ul><li>As more of the occlusal table is involved, the more a balanced occlusal scheme may be of benefit </li></ul>