Transcript Minor Connectors - :: King George's Medical

Minor Connectors
Dr Kaushal Kishor Agrawal
Assistant Professor
Department of Prosthodontics
KGMU , Lucknow
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
edentulous ridge
major connector
butt joint
slight undercut
incorrect (>90° joint)
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”
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
Q2: Minnor Connector should join major
connector at an angle of
1. 90 degree
2. > 90 degree
3. < 90 degree
4. At any angle
Q3: Embrasure minor connector should be
1. Triangular
2. Rectangular
3. Square
4. Linear
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
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
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
Q8: Proximal plate is shifted Shifted slightly
lingually to
1. Increases rigidity
2. Enhances reciprocation
3. Improves esthetics
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
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