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Minor Connectors Dr Kaushal Kishor Agrawal Assistant Professor Department of Prosthodontics KGMU, Lucknow Dr Kaushal Kishor Agrawal Assistant Professor.

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Presentation on theme: "Minor Connectors Dr Kaushal Kishor Agrawal Assistant Professor Department of Prosthodontics KGMU, Lucknow Dr Kaushal Kishor Agrawal Assistant Professor."— Presentation transcript:

1 Minor Connectors Dr Kaushal Kishor Agrawal Assistant Professor Department of Prosthodontics KGMU, Lucknow Dr Kaushal Kishor Agrawal Assistant Professor Department of Prosthodontics KGMU, Lucknow

2 Minor Connectors Connects components to the major connector –Direct retainer –Indirect retainer –Denture base Connects components to the major connector –Direct retainer –Indirect retainer –Denture base

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

4 Types of Minor Connectors Embrasure Minor Connectors –Between two adjacent teeth Embrasure Minor Connectors –Between two adjacent teeth

5 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 Embrasure Minor Connectors –Triangular shaped in cross section –Joins major connector at right angles –Relief placed so connector not directly on soft tissue

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

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

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

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

10 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 Lattice Type Potentially superior retention Interferes with setting of teeth, if struts are too thick –Both types are acceptable if correctly designed

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

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

13 Relief Under the Gridwork Should begin mm from the abutment tooth

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

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

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

17 Maxillary Gridwork Design Gridwork –2/3 of the length of from abutment to the hamular notch Major connector –extends fully to the hamular notch Gridwork –2/3 of the length of from abutment to the hamular notch Major connector –extends fully to the hamular notch

18 Gridwork Design Facially just over the crest of the residual ridge

19 Position of Major Connector Junction Should be ≈ 2 mm medial to lingual surface of denture teeth Ensures bulk of resin around teeth Should be ≈ 2 mm medial to lingual surface of denture teeth Ensures bulk of resin around teeth

20 Mandibular Tissue Stops Contact of metal with cast at posterior of distal extension gridwork Prevents distortion at free end during hydraulic pressure of processing Contact of metal with cast at posterior of distal extension gridwork Prevents distortion at free end during hydraulic pressure of processing

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

22 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 Minor connectors originating from the gridwork in an edentulous area Broad contact with guiding planes May or may not terminate in an occlusal rest

23 Proximal Plates

24 Shifted slightly lingually –Increases rigidity –Enhances reciprocation –Improves esthetics Often a triangular space below the guiding plane (an undercut) Shifted slightly lingually –Increases rigidity –Enhances reciprocation –Improves esthetics Often a triangular space below the guiding plane (an undercut)

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

26 Zero Degree Block-Out Does not deviate from path of insertion Instructions to the laboratory should state “Use zero degree blockout” Does not deviate from path of insertion Instructions to the laboratory should state “Use zero degree blockout”

27 Q1: Which is not function of Minnor Connector 1. Unification and rigidity 2. Stress distribution 3. Bracing through contact with guiding planes 4. Retention of RPD Q1: Which is not function of Minnor Connector 1. Unification and rigidity 2. Stress distribution 3. Bracing through contact with guiding planes 4. Retention of RPD

28 Q2: Minnor Connector should join major connector at an angle of degree 2. > 90 degree 3. < 90 degree 4. At any angle Q2: Minnor Connector should join major connector at an angle of degree 2. > 90 degree 3. < 90 degree 4. At any angle

29 Q3: Embrasure minor connector should be 1. Triangular 2. Rectangular 3. Square 4. Linear Q3: Embrasure minor connector should be 1. Triangular 2. Rectangular 3. Square 4. Linear

30 Q4: Which Gridwork minor connector connector commonly interfer with setting of teeth 1. Mesh work 2. Lattice Work 3. Bead type 4. Both Mesh and lattice work Q4: Which Gridwork minor connector connector commonly interfer with setting of teeth 1. Mesh work 2. Lattice Work 3. Bead type 4. Both Mesh and lattice work

31 Q5: Which part of Maxillary cast R PD framework act as tissue stop 1. Major connector 2. Minor connector 3. Direct retainet 4. Occlusal rest Q5: Which part of Maxillary cast R PD framework act as tissue stop 1. Major connector 2. Minor connector 3. Direct retainet 4. Occlusal rest

32 Q6: Which is not true for Mandibular Grid work framework 1. Extend 2/3 of the way from abutment tooth to retromolar pad 2. Never on the ascending portion of the ridge 3. Always cover retromolar pad 4. Need for tissue stops Q6: Which is not true for Mandibular Grid work framework 1. Extend 2/3 of the way from abutment tooth to retromolar pad 2. Never on the ascending portion of the ridge 3. Always cover retromolar pad 4. Need for tissue stops

33 Q8: Proximal plate is shifted Shifted slightly lingually to 1. Increases rigidity 2. Enhances reciprocation 3. Improves esthetics 4. All of above Q8: Proximal plate is shifted Shifted slightly lingually to 1. Increases rigidity 2. Enhances reciprocation 3. Improves esthetics 4. All of above

34 Q9: Gridwork minnor connector 1.Connect the denture base and teeth to the major connector 2. Connect the denture base and teeth to the Occlusal rest 3. Connect the major connnector to the direct retainer 4.All of above Q9: Gridwork minnor connector 1.Connect the denture base and teeth to the major connector 2. Connect the denture base and teeth to the Occlusal rest 3. Connect the major connnector to the direct retainer 4.All of above

35 Q10. Function of tissue stop 1. Prevents distortion at free end during hydraulic pressure of processing 2. It compromises the shrinkage in resin 3.It provide rigidity to denture framework 4. All of above Q10. Function of tissue stop 1. Prevents distortion at free end during hydraulic pressure of processing 2. It compromises the shrinkage in resin 3.It provide rigidity to denture framework 4. All of above


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