Minor Connectorsg Flashcards
What are the parts of RPD that consider as minor connectors ?
-proximal plate minor connectors
-minor connectors are placed between the embrasures of adjacent teeth
-gridwork minor connectors
What is the function of minor connectors in general?
Connect the other components to the major connector
Enumerate the functions of minor connectors?
- Provide unification and rigidity.
- Provide stress distribution by transferring stresses from the major connector to other parts of the partial denture and from the partial denture to the abutment teeth.
- Act as bracing elements through contact with guiding planes opposing the retentive arms . 4. Maintain a path of insertion via contact with guiding planes .
Embrasure minor connector should be _____ in shape in cross section,why?
-Should be triangular
-to minimize intrusion into the tongue or vestibular spaces , while still providing adequate bulk for rigidity .
Embrasure minor connectors should be join the major connector at ____ angle
Right angle
Embrasure minor connectors should cover as_______an area of tissue as possible
Small
The juncture of the embrasure minor connector with major connector should be_____ and ____
Round and not sharp
In which area the embrasure minor connector should not be in contact with the tooth?
Below the height of contour
Why embrasure minor connector should not be contact the tooth below its height of contour?
Because Wedging force maybe created during functional movements of the framework
Embrasure minor connectors are placed directly or indirectly on the soft tissue?
Placed indirectly on the soft tissue by providing relief
The smooth surface of the embrasure minor connector should face the _____side,why?
-Lingual side
-to minimise food trapping
Embrasure minor connectors should be _____with the long axis of the tooth
Parallel
Types of gridwork minor connectors?
-mesh work
-lattice work
Advantages of mesh type minor connector?
-potential rigidity
-tends to be flatter than lattice
Disadvantages of mesh type minor connector?
-less retention of acrylic if the openings are insufficiently large
Advantages of lattice type minor connector?
-superior retentive potential of acrylic
Disadvantage of lattice type minor connector?
-interfere with the setting of teeth,(if it is made too thick or poorly positioned)
How to gain adequate mechanical retention of the denture base resin?
By providing relief under the gridwork,(to allow the acrylic resin to flow under the gridwork)
Thickness of relief was under the gridwork minor connector?
About 1mm
Relief should not be started immediately adjacent to the abutment tooth,but should begin about____mm from the abutment
1.5-2mm
Relief under the gridwork should not be started immediately adjacent to the abutment tooth,why?
This will create a metal to tissue contact immediately adjacent to the tooth.A metal surface is preferable since it wears less , and is less porous , thus facilitating hygiene.
The junction between the gridwork minor connector and major connector should be…?
-should be in the form of butt joint with a slight undercut
-the angle should be not greater than 90 degree
Why should the junction between gridwork minor connector and major connector in the form of butt joint?
This provides for maximum bulk of the acrylic resin denture base at the metal junction to prevent the creation of thin , weak , feather edges which can easily fracture or distort .
Why should the junction between the gridwork minor connector and major connector in the form of butt joint?
This provides for maximum bulk of the acrylic resin denture base at the metal junction to prevent the creation of thin , weak , feather edges which can easily fracture or distort .
