Jaw Relation Records for RPD

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.


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


Inter-occlusal Record

Bilateral Contact of Posterior Teeth at

Inter-cuspal position (ICP).


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.


Adjusting the Occlusion rim

Adjusting the Occlusal Plane following

the remaining natural teeth


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.


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


. 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.


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.


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,


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


5 Fully dentate

Kennedy Class III


6 Kennedy Class III

Kennedy Class III


7 Kennedy Class IV

Fully dentate

Contact in centric

No eccentric contact

Documents

Jaw Relation Records for RPD