Methods of Recording Jaw relations

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
(Wax, Zinc oxide)
Kennedy Class III
Occlusal Rimes
Distal extension
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’
• Horizontal Jaw Relations:
Occlusion Vertical Dimension ‘OVD’
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
2 Fully dentate Kennedy Class I
restored by RPD
Balanced occlusion
(working, Balancing,
protrusive)
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