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07 1. minor connectors

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07 1. minor connectors

  1. 1. Minor Connectors • Connects components to the major connector – Direct retainer – Indirect retainer – Denture base
  2. 2. Functions of Minor Connectors • Unification and rigidity • Stress distribution • Bracing through contact with guiding planes • Maintain a path of insertion
  3. 3. Types of Minor Connectors • Embrasure Minor Connectors – Between two adjacent teeth
  4. 4. Types of Minor Connectors • Embrasure Minor Connectors – Triangular shaped in cross section – Joins major connector at right angles – Relief placed so connector not directly on soft tissue
  5. 5. Types of Minor Connectors • Embrasure Minor Connectors – Contact teeth above height of contour – Prevents wedging & tooth mobility – Alternatively, difficult to seat
  6. 6. Gridwork Minor Connectors • Connect the denture base and teeth to the major connector
  7. 7. Gridwork Minor Connectors • Adjacent edentulous spaces • Usually connect major connector to direct retainers • Open lattice work or mesh types
  8. 8. Gridwork Minor Connectors • Mesh type – Flatter – Potentially more rigid – Less retention for acrylic if openings are small
  9. 9. Gridwork Minor Connectors • Lattice Type • Potentially superior retention • Interferes with setting of teeth, if struts are too thick – Both types are acceptable if correctly designed
  10. 10. Gridwork Relief • Mechanical retention of denture base resin • Allows the acrylic resin to flow under the gridwork
  11. 11. Gridwork Relief • Relief wax is placed in the edentulous areas • 1 mm of relief
  12. 12. Relief Under the Gridwork • Should begin 1.5 - 2 mm from the abutment tooth
  13. 13. Relief Under the Gridwork • Creates a metal to tissue contact adjacent tooth – Preferable since it wears less – Less porous, (hygiene)
  14. 14. Junction With Major Connector • Butt joint with slight undercut in metal • Maximum bulk of the acrylic resin • Prevents thin, weak edges fracturing er m digac nejre to oo u cr lu o sn dt bse ic9 ulgun0 toiht o° jit tn r(jit nu en d c) r to c>
  15. 15. Mandibular Gridwork Design • Extend 2/3 of the way from abutment tooth to retromolar pad • Never on the ascending portion of the ridge St e wa r t ' s , Fi g . 2 - 5 5
  16. 16. Maxillary Gridwork Design • Gridwork – 2/3 of the length of from abutment to the hamular notch • Major connector – extends fully to the hamular notch
  17. 17. Gridwork Design Facially just over the crest of the residual ridge
  18. 18. Position of Major Connector Junction • Should be ≈ 2 mm medial to lingual surface of denture teeth • Ensures bulk of resin around teeth
  19. 19. Mandibular Tissue Stops • Contact of metal with cast at posterior of distal extension gridwork • Prevents distortion at free end during hydraulic pressure of processing
  20. 20. No Tissue Stops In Maxilla • Maxillary major connector acts as a tissue stop (no relief)
  21. 21. Proximal Plates • Minor connectors originating from the gridwork in an edentulous area • Broad contact with guiding planes • May or may not terminate in an occlusal rest
  22. 22. Proximal Plates
  23. 23. Proximal Plates • Shifted slightly lingually – Increases rigidity – Enhances reciprocation – Improves esthetics • Often a triangular space below the guiding plane (an undercut)
  24. 24. Proximal Plates • Rigid, cannot be placed in undercut • Block-out placed in undercuts prior to waxing and casting the framework
  25. 25. Zero Degree Block-Out • Does not deviate from path of insertion • Instructions to the laboratory should state “Use zero degree blockout”

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