mejor connectors in removable partial dentures

COMPONENTS OF R.P.D
www.asiandentalacademy.org

COMPONENTS OF R.P.D
• MAJOR CONNECTORS
• MINOR CONNECTORS
• RESTS
• DIRECT RETAINERS
• STABILIZING OR RECIPROCAL COMPONENTS
• INDIRECT RETAINERS
• ONE OR MORE BASES

MJ C
Min C
O R
DR
S R

MAJOR CONNECTORS
• It is the component of the partial denture that connects
the parts of the prosthesis located on one side of the
arch with those on opposite side.
-Connects all parts directly or indirectly.
-cross arch stabilization

CHARACTERISTICS
• Rigidity
• Location
-free from movable tissues
-impingement of gingival tissues to be
avoided
-bony and soft tissue prominences to
be avoided during placement and
removal
-relief to be provided (tori, median
suture)

CHARACTERISTICS OF MAJOR CONNECTOR
• Compatible alloy
• Shouldn't interfere the tongue
• Shouldn't alter the natural contours of the lingual
surfacepalatal vault
• Should not impinge on tissues
• Should not trap food
• should support the prosthesis

• Palatal major
connector should be at
least 6 mm away from
gingival margins.
• Lingual bar major
connector should be
located at least 4 mm
inferior to the gingival
margins,more if
possible

MAXILLARY MAJOR CONNECTORS
• Single palatal bar
• Single palatal strap
• U shaped palatal connector
• Combination Anterior and Posterior palatal strap- type
connector
• Palatal plate

SINGLE PALATAL BAR
A partial denture made with a single palatal bar is
often to thin and flexible or too bulky and
objectionable to the patients tongue.
A palatal connector of
less than 8mm in
width is referred to as
a bar

SINGLE PALATAL STRAP
Bilateral tooth supported restorations,those with
short edentulous spaces are more effectively
connected with a single broad palatal strap

U SHAPED PALATAL MAJOR CONNECTOR
Major connector
Least desirable of maxillary major connectors, used when
large inoperable torus exists

• Lack of rigidity
• Design fails to provide good support
• Bulk to enhance rigidity results in increased thickness in
areas that are a hindrance to the tongue
PRINCIPLE OBJECTIONS TO USE
U SHAPED CONNECTOR

ANTERIOR AND POSTERIOR PALATAL STRAP-
TYPE CONNECTOR
Structurally rigid.
Strength of this major
connector is because they
form a rectangular or square
frame
Used in classes 2 and 4.
Single palatal strap in class 3

PALATAL PLATE
It is a thin ,broad, contoured palatal
coverage,covering one half or more
of the hard palate.
Advantages
Uniformly thin, thermal conductivity
Strength
Intimate contact leads to retention

DESIGN OF MAXILLARY MAJOR CONNECTOR
• Out line of primary bearing areas

DESIGN OF MAXILLARY MAJOR CONNECTOR
• Outline of connector areas
• Selection of connector type
• Unification
♦Outline of non
bearing areas

MANDIBULAR MAJOR CONNECTORS.
• LINGUAL BAR
• LINGUAL BAR WITH CINGULAM BAR(CONTINOUS
BAR)
• LINGUAL PLATE
• LABIAL BAR

LINGUAL BAR It is half pear
shaped,located above
moving tissues .
But as far below gingival
tissues possible
Sub lingual bar :A bar type lying parallel
to the anterior floor of the mouth

LINGUAL BAR WITH RETAINER
Cingulum bar located on or
slightly above the cingula of
the anterior teeth may be
added to the lingual bar or
can be used independently
Used when axial
alignment of anterior
teeth needs excessive
block out of undercuts

LINGUOPLATE
Upper border at supra
cingular surfaces
Lower border is half pear
shaped
Indications
High lingual frenum
In class 1 where more residual ridge
resorption
Stabilizing periodontally weak teeth
Facilitates future replacement of teethwww.asiandentalacademy.org

LABIAL BAR
Used when severe
lingual inclination of
teeth.
Mandibular torus
interferes with
placement of lingual
bar

ACRYLIC / METAL PARTIAL
DENTURE

SWING LOCK DESIGN
• Consists of a labial or
buccal bar that is
connected to major
connector by a hinge on
one end and latch at the
other end.
• Support –provided by
multiple rests on the
remaining natural teeth.

SWING LOCK DESIGN
♦Stabilization and
♦ reciprocation –provided by linguoplate
contacting remaining teeth
♦Retention-provided by bar type retentive clasp
arms projecting from the labial or buccal bar
contacting the infra bulge areas

SWING LOCK DESIGN- INDICATIONS
• Missing key abutments such as canine
• Unfavorable tooth contours like excessive labial
inclinations of anterior teeth
• Unfavorable Soft tissue contours
• Teeth with questionable prognosis
Contraindications
Poor oral hygiene
Shallow buccal or labial vestibule

DESIGN OF MANDIBULAR MAJOR CONNECTOR
• Out line the basal seat area of the diagnostic cast
• Out line the inferior border of the major connector
• Out line the superior border of the major connector
• Connect the basal seat area to the inferior and
superior border of the major connector, and add the
minor connector to retain the acrylic denture base
material

Out line the basal seat area
of the diagnostic cast
♦Out line the inferior
border of the major
connector

♦Out line the superior
border of the major
connector
♦Connect the basal seat
area to the inferior and
superior border of the
major connector, and add
the minor connector to
retain the acrylic denture
base materialwww.asiandentalacademy.org

MINOR CONNECTORS

Minor connector
Minor connectors can be defined as the connecting link
between the major connector or base of a removable
partial denture to other units of a prosthesis such as clasp
assembly, indirect retainers, rests etc

FUNCTIONS OF A MINOR CONNECTOR
• To transfer functional stress to the abutment teeth.
Prosthesis- to- abutment function
To transfer the effect of retainers, rests and stabilizing
components to the rest of the denture.
Abutment - to - prosthesis function

FORM AND LOCATION
1 Should have sufficient bulk to be rigid
2. When contacting an axial surface it should not be
located on a convex surface but instead should be
located in an embrasure where it will be least
noticeable to the tongue.
3. Should be thickest towards the lingual surface
tapering towards the contact area.
4. Should form a right angle with the major connector so
that the gingival crossing is abrupt and cover as little
gingival tissue as possible.
5. Sharp angles should be avoided and spaces should
not exist for trapping of food debris.

-Minor connectors contacting the guide plane surfaces are as
broad as 2/3 the distance between the tips of adjacent buccal
and lingual cusps of the abutment tooth.
-They should extend gingivally contacting an area of the
abutment tooth from the marginal ridge to 2/3 the length of the
enamel crown.
-When an artificial tooth is to be placed the thickest portion
should be at the lingual line angle of the abutment tooth.

MINOR CONNECTORS THAT JOIN THE DENTURE BASE
TO THE MAJOR CONNECTOR
3 types:
1. Lattice work construction
2. Mesh construction
3. Bead,wire or nail head minor connector

TISSUE STOPS
Used on all distal extension partial dentures using
latticework or mesh retention

FINISH LINES
• To provide sufficient bulk of acrylic resin to produce a smooth and
even joint with the metal framework, provision must be made to
provide space for a butt joint so that the acrylic resin can be
finished evenly with the major connector.
2 types
-Internal finish line
-External finish line

mejor connectors in removable partial dentures

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