Jaw Relation
Records& Techniques
for RPD
OBJECTIVES
1. Arrangement of the artificial teeth
2. To distribute functional forces
between the remaining natural
teeth & the residual ridge
(harmonious occlusion)
CLINICAL APPROACH 1. There are sufficient teeth present in
both jaws to indicate inter-cuspal or tooth
position
2. There are insufficient teeth present to
indicate inter-cuspal or tooth position
3. One jaw is edentulous and the other is to
be restored by RPD
Methods of Recording Jaw relations
Direct Apposition of Casts
(Hand Articulation)
This method can only be used
when sufficient opposing
teeth remain in contact to
make the existing jaw
relationship obvious.
Methods of Recording Jaw relations Direct Apposition of Casts
(Hand Articulation)
The occluded casts are secured together with the
help of wooden sticks and sticky wax and
mounted arbitrary on an articulator.
A face-bow record is not indicated. A clinical appointment is saved by using this method.
Methods of Recording Jaw relations
The remaining dentition does not provide sufficient occlusion
It is not permit occluding the casts by hands.
There are Two Possibilities:
Inter-occlusal Record Occlusal Rimes
(Wax, Zinc oxide) Distal extension
Kennedy Class III Long bounded areas
Methods of Recording Jaw relations
Inter-occlusal Record
Bilateral Contact of Posterior Teeth at
Inter-cuspal position (ICP).
Methods of Recording Jaw relations
Occlusal Rimes 1. The framework with the attached record block is
first tried in the mouth for reconfirming the fit of
framework.
2. An auto-polymerizing acrylic resin
base is usually attached to the
framework saddle areas
3. A wax occlusion rim is then placed
over the resin base, while
considering the width and
height dimensions of the natural
missing teeth.
Methods of Recording Jaw relations
Adjusting the Occlusion rim
Adjusting the Occlusal Plane following
the remaining natural teeth
Methods of Recording Jaw relations
Adjusting the Occlusion rim
The recording medium (wax or ZnO
paste) is then placed on the
mandibular wax rims the patient is
then guided in the desired C.O or
C.R position.
Methods of Recording Jaw relations
One jaw is edentulous and the other is to be restored by RPD
Vertical Jaw Relations: Rest Vertical Dimension RVD
Occlusion Vertical Dimension OVD
Horizontal Jaw Relations: Centric Relation
Centric Occlusion
Eccentric Relations
Protrusive relation
Lt & Rt Lateral relations
Methods of Recording Jaw relations
. One of the arches is edentulous.
Vertical Jaw Relations
Rest Vertical Dimension RVD
Occlusion Vertical Dimension OVD
Inter-occlusal Distance / Free
way Space
Horizontal Jaw Relation Centric Relation
the most retruded position of the mandible
to maxilla at an established OVD.
It is a bone to bone relation
Horizontal Jaw Relation
Centric Occlusion
the relation of the mandible to maxilla in the maximum intercuspation of the teeth.
It is a tooth-tooth relation - a position of habitual
closure.
Horizontal Jaw Relation
What to Record C.R or C.O?
In more than 90% of people, C.O is 0.1 - 2mm in
front of the CR.
Horizontal Jaw Relation
What to Record C.R or C.O ?
Centric Occlusion should be recorded whenever a patient requiring a partial denture has
cusps on remaining natural teeth that can guide
the mandible back to this position,
Horizontal Jaw Relation
What to Record C.R or C.O
C.R should be recorded, e.g., for distal extension RPD, or when the opposing arch is edentulous.
The registration obtained by means of a
face-bow is called a
face-bow record.
Obtaining & Transferring the Face-bow Record
Orientation of face-bow to articulator.
Functional- Generated Path
Method(Dynamic Method)
STEP BY STEP PROCEDURE FOR
REGISTRING OCCLUSAL PATHWAY
After the framework has been adjust to fit the mouth, the technique for registration of occlusal pathways
is as follow:
1. Support the wax occlusion rim by a denture base
having as same degree of accuracy and stability as
the finished denture base.
The wax used for the occlusion rim should be hard
enough to support biting stress and should be tough
enough to resist fracture.( purple hard inlay wax)
2. Inform the patient that the occlusal rim must be worn
for 24hours or longer. It should be worn constantly,
including night-time, excepts for removal during
meal. By wearing and biting into a hard occlusal rim ,
record is made of all extent of jaw movement
STEP BY STEP PROCEDURE FOR
REGISTRING OCCLUSAL PATHWAY
3. After 24 hours the occlusal surface of the wax rim should show gloss generated pathways.
Which indicate functional contact with opposing
teeth in all extreme of movements.
Any are of deficient are add this time.
4. These generated pathways are reproduced by
stone. Each grove in wax representing pathway
of a cusp becomes a ridge of stone
5. Artificial teeth are arranged on the RPD
framework to inter-cuspate with the pathways of
their antagonists
This method eliminate the need of face bow transfer
Bec. Patient himself, is the best articulator for
developing occlusion.
GUIDELINES FOR CHOICE OF OCCLUSAL
CONCEPT FOR PARTIALLY EDENTULOUS
PATIENTS Maxillary arch Mandibular arch Occlusal concept
1 Fully edentulous
restored by CD
Kennedy Class I
restored by RPD
Balanced occlusion
(working, Balancing,
protrusive)
2 Fully dentate Kennedy Class I
restored by RPD
Working side contact
3 Kennedy Class I
restored by RPD
Fully dentate
Working & Balancing
side contact
4 Kennedy Class II Fully dentate
Working side contact
5 Fully dentate
Kennedy Class III
Working side contact
6 Kennedy Class III
Kennedy Class III
Working side contact
7 Kennedy Class IV
Fully dentate
Contact in centric
No eccentric contact
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