Minor Connectors Connects components to the major connector
- Slides: 25
Minor Connectors • Connects components to the major connector – Direct retainer – Indirect retainer – Denture base
Functions of Minor Connectors • Unification and rigidity • Stress distribution • Bracing through contact with guiding planes • Maintain a path of insertion
Types of Minor Connectors • Embrasure Minor Connectors – Between two adjacent teeth
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
Types of Minor Connectors • Embrasure Minor Connectors – Contact teeth above height of contour – Prevents wedging & tooth mobility – Alternatively, difficult to seat
Gridwork Minor Connectors • Connect the denture base and teeth to the major connector
Gridwork Minor Connectors • Adjacent edentulous spaces • Usually connect major connector to direct retainers • Open lattice work or mesh types
Gridwork Minor Connectors • Mesh type – Flatter – Potentially more rigid – Less retention for acrylic if openings are small
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
Gridwork Relief • Mechanical retention of denture base resin • Allows the acrylic resin to flow under the gridwork
Gridwork Relief • Relief wax is placed in the edentulous areas • 1 mm of relief
Relief Under the Gridwork • Should begin 1. 5 - 2 mm from the abutment tooth
Relief Under the Gridwork • Creates a metal to tissue contact adjacent tooth – Preferable since it wears less – Less porous, (hygiene)
Junction With Major Connector • Butt joint with slight undercut in metal • Maximum bulk of the acrylic resin • Prevents thin, weak edges fracturing
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
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 Design Facially just over the crest of the residual ridge
Position of Major Connector Junction • Should be ≈ 2 mm medial to lingual surface of denture teeth • Ensures bulk of resin around teeth
Mandibular Tissue Stops • Contact of metal with cast at posterior of distal extension gridwork • Prevents distortion at free end during hydraulic pressure of processing
No Tissue Stops In Maxilla • Maxillary major connector acts as a tissue stop (no relief)
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
Proximal Plates
Proximal Plates • Shifted slightly lingually – Increases rigidity – Enhances reciprocation – Improves esthetics • Often a triangular space below the guiding plane (an undercut)
Proximal Plates • Rigid, cannot be placed in undercut • Block-out placed in undercuts prior to waxing and casting the framework
Zero Degree Block-Out • Does not deviate from path of insertion • Instructions to the laboratory should state “Use zero degree blockout”
- Function of retentive arm
- Butt joint rpd
- Beading of major connector
- Major arc?
- Gridwork minor connector
- Types of minor connector
- Half pear shaped lingual bar
- Cingulum rests
- Compatibil determinat
- Removable partial denture parts
- Stress breakers in rpd
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- Stress breaker
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- Double lingual bar major connector
- Indirect retainer
- Stress breaker rpd
- Fulcrum line
- Guide planes in rpd
- Tagonist types
- Chapter 4 diatonic chords in major and minor keys
- Glomerlus
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- Major and minor supporting details
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