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Minor Connectors

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Minor Connectors Connects components to the major connector Direct retainer Indirect retainer Denture base Functions of Minor Connectors Unification and rigidity ... – PowerPoint PPT presentation

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Title: Minor Connectors


1
Minor Connectors
  • Connects components to the major connector
  • Direct retainer
  • Indirect retainer
  • Denture base

2
Functions of Minor Connectors
  • Unification and rigidity
  • Stress distribution
  • Bracing through contact with guiding planes
  • Maintain a path of insertion

3
Types of Minor Connectors
  • Embrasure Minor Connectors
  • Between two adjacent teeth

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
Types of Minor Connectors
  • Embrasure Minor Connectors
  • Contact teeth above height of contour
  • Prevents wedging tooth mobility
  • Alternatively, difficult to seat

6
Gridwork Minor Connectors
  • Connect the denture base and teeth to the major
    connector

7
Gridwork Minor Connectors
  • Adjacent edentulous spaces
  • Usually connect major connector to direct
    retainers
  • Open lattice work or mesh types

8
Gridwork Minor Connectors
  • Mesh type
  • Flatter
  • Potentially more rigid
  • Less retention for acrylic if openings are small

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
Gridwork Relief
  • Mechanical retention of denture base resin
  • Allows the acrylic resin to flow under the
    gridwork

11
Gridwork Relief
  • Relief wax is placed in the edentulous areas
  • 1 mm of relief

12
Relief Under the Gridwork
  • Should begin 1.5 - 2 mm from the abutment tooth

13
Relief Under the Gridwork
  • Creates a metal to tissue contact adjacent tooth
  • Preferable since it wears less
  • Less porous, (hygiene)

14
Junction With Major Connector
  • Butt joint with slight undercut in metal
  • Maximum bulk of the acrylic resin
  • Prevents thin, weak edges fracturing

15
Mandibular Gridwork Design
  • Extend 2/3 of the way from abutment tooth to
    retromolar pad
  • Never on the ascending portion of the ridge

Stewart's, Fig. 2-55
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
Gridwork Design
Facially just over the crest of the residual ridge
18
Position of Major Connector Junction
  • Should be 2 mm medial to lingual surface of
    denture teeth
  • Ensures bulk of resin around teeth

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
No Tissue Stops In Maxilla
  • Maxillary major connector acts as a tissue stop
    (no relief)

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
Proximal Plates
23
Proximal Plates
  • Shifted slightly lingually
  • Increases rigidity
  • Enhances reciprocation
  • Improves esthetics
  • Often a triangular space below the guiding plane
    (an undercut)

24
Proximal Plates
  • Rigid, cannot be placed in undercut
  • Block-out placed in undercuts prior to waxing and
    casting the framework

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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