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RECORDING OFJAW RELATION
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Jaw Relation “ It is any relation between the mandible and the maxilla.”
It is a three dimensional relation ( vertical, anteroposterior and lateral).
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DEFINTIONSCentric relation (It a bone to bone relation ) It is the most retruded unstrained
postion of the condyle in the glenoid fossae
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Centric occlusionIt the relation of opposing occluding
surfaces when the mandible in centric relation to maxilla
The centric occlusion May or may not coincide with MI.
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Occlusal Vertical Dimension• The distance measured between two points
when occluding members are in contact in centric occlusion.
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Vertical Dimension of occlusion V D OThe vertical dimension of the face when
the teeth are in contact in centric occlusion.
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Vertical Dimension of rest V D RThe vertical dimension of the face when
the mandible is in rest position.
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V D R
V D O
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Inter Occlusal Distance (Free Way Space) = 2 to 4 mm. ( F W S ) (0 to 10 mm.)
Vertical Dimension
V D R - F W S =
V D O
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CENTRIC OCCLUDING RELATIONIT RECORDING A CENTRIC RELATION AT
ACCEPATABLE VERTICAL DIMENSION OF OCCLUSION
“ (Centric relation between maxilla and mandible at the proper vertical dimension of occlusion)
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RECORDING JAW RELATIONSHIPS1. Check denture foundation.2. Establish facial contour.3. Establish occlusal plane.4. Maxillary face-bow record.5. Determination of vertical dimension of centric
occluding relation.6. Equalize pressure of occluding forces.7. Determine centric relation at the accepted
vertical dimension.8. Locking device ( recording the C.O.R. )
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Check denture foundations.
Extension
Retention
Stability
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Establish facial contour Facial contour depends on the
presence and alignment of teeth.
Teeth position or wax rim supports facial musculature and appearance.
Position of teeth governs tongue space and neutral zone.
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Determination of occlusal plane
Aesthetic base. Phonetic base. Functional base. Mechanical base.
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Anterior occlusal plane :Parallel to interpupillary line .
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Posterior occlusal plane : Parallel to the ala tragus line .
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Determination of Vertical Dimension of Centric Occluding Relation
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Variables Affecting V D R :Short Term Variables :
1. Position of the patient's head .2. Respiration.3. Stress Situations .
Long Term Variables :1. Loss of the properioceptives impulses from the periodontal ligament.2. Age.
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1- inharmonious facial proportions (Appearance).
2- Flexor muscles are in constant strain.
3- The lips are unnaturally separated and have a strained appearance.
4- The free-way space will be obliterated, inability
to find comfortable resting position.
5- Clicking of teeth may occur during speech and mastication.
Sequel Of Improper Registration Of V.D.0.A . High Vertical Dimension Of Occlusion :
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Sequel Of Improper Registration Of V.D.0.
6- Generalized soreness of the residual ridge.
7. Difficulty in swallowing and gagging sensation (Discomfort).
8. Loss of biting power and muscular fatigue.
9. Interference with speech .
10. Pain under the basal seat and trauma to the supporting structures .
11. Accelerate bone resorption.
A . High Vertical Dimension Of Occlusion :
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High Vertical Dimension
Flabby Tissue
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High Vertical Dimension
High Plane of Occlusion
Obliteratedfree-way space
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Establishing too little V.D.
1- Extensor muscles are strained.
2- Facial appearance is distorted.
3- Corners of the mouth may be
inflamed ( angular chielitis ).
4- Pain in tempro-mandibular joint.
5- Cheek biting.
6- Inefficiency: reduces biting force
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Cheek Biting
MonoplaneHeavy BiteNo Horizontal Overlap
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Angular Cheilitis
Corner of Mouth
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Trouble in the T.M.J.The symptoms of the joint due to
reduced V.D. are manifested by Obscure pains and discomfort, Clicking sounds, Headaches and neuralgia running in
the ear. These symptoms may be resulted from
pressure on the tympanic nerve.
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RECORDING JAW RELATIONSHIPS1. Check denture foundation.2. Establish facial contour.3. Establish occlusal plane.4. Maxillary face-bow record.5. Determination of vertical dimension of centric
occluding relation.6. Equalize pressure of occluding forces.7. Determine centric relation at the accepted
vertical dimension.8. Locking device ( recording the C.O.R. )
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FACE-BOWSThe face-bow is a caliper-like device that is used to record the relationship of the jaws to the tempromandibular joint or ( opening axis of the jaws ) and to orient the casts in this same relationship to the opening axis of the articulator.
The face-bow transfer ensures that the casts are mounted centrally in correct relation to the inter-condylar axis
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Types of Face BowsMandibular
“A device used to locate the transverse hinge or
the condylar axis.”
Maxillary
“A device used to record the relation between the maxilla and the TMJ and to transfer this relation
to the articulator.”
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Mandibular Face Bow
Limited opening and closing allows the condylar rods to draw arcs. The rods are moved towards the center of the arcs, until they move in a point . The latter is called the still point and represents the condylar axis. The condyle in this position lies in the most retruded unstrained position in the glenoid fossa, so mandible and maxilla arein centric.
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Maxillary Face Bow
Components:
GraduatedCondylar Rods
Tightening clamp
U Shaped Bow
Bite Fork
Universal Joint /Jack Clamp
Infraorbital Pointer
Graduations on the rod
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Facia face bow
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The ear-bow uses the external auditory
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Maxillary Face Bow Record1- Bite fork is heated and inserted into the rim
.
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Cont. Maxillary Face Bow Record
2-The condylar axis is then determined
11- 13 mm
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Cont. Maxillary Face Bow Record
4- Universal joint once tightened , never opened.
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Maxillary Face Bow Transfer
1- The slide bar clamp is unscrewd to remove assembly from the face.
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Cont. Maxillary Face Bow Transfer
2- Assembly is now centralized on the articulator.
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Equalize pressure of occluding forces
This means to produce even contact between the upper and lower occlusionblocks without displacement of denturesupporting tissues. This can only bedone on an easily displaceable materialsuch as softened wax.
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Methods of recording the jaw relation
1- Terminal hinge axis method (Mandibular face bow method)
2- Chew-in or functional method
3- Graphic tracing method
4- Check bite / wax wafer/ wax registration method
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1- Terminal hinge axis method
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2- Chew in technique
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3- Graphic tracing method
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The resulting arrow represents the centric and eccentric relations
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TYPES OF TRACERSA- Intraoral tracer
B- Extraoral tracer
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4- Check bite technique(Wax wafer method)
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Methods to guide the mandiblein centric relation
1- Tongue retrusion .2- Swallowing .3- Biting operator’s fingers .4- Relaxation .5- Fatigue .6- Head position .7- The temporalis muscle check .
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Wax registration method
or Check bites
or Wax wafer method
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Excursive methods
orGraphic tracing
method
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Eccentric jaw relationships
Protrusive recordRight lateral recordLeft lateral record
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Locking deviceV shaped notches can be carved onthe upper occlusion rim and the finalclosure is done on softened wax. Theimprints of these notches are used tolock upper and lower occlusion blocks.
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