1. RECORDING OF
JAW RELATION

2. Jaw Relation “ It is any relation between the mandible
and the maxilla.”
It is a three dimensional relation ( vertical, anteroposterior and lateral).

3. DEFINTIONS Centric relation (It a bone to bone relation )
It is the most retruded unstrained postion of the condyle in the glenoid fossae

4. Centric occlusion
It the relation of opposing occluding surfaces when the mandible in centric relation to maxilla
The centric occlusion
May or may not coincide with MI.

5. Occlusal Vertical Dimension
The distance measured between two points when occluding members are in contact in centric occlusion.

6. Vertical Dimension of occlusion
V D O
The vertical dimension of the face when the teeth are in contact in centric occlusion.

7. Vertical Dimension of rest
V D R
The vertical dimension of the face when the mandible is in rest position.

8. V D R
V D O

9. Vertical Dimension V D O V D R - F W S = Inter Occlusal Distance
(Free Way Space) = to mm.
( F W S ) (0 to 10 mm.)
V D O
V D R - F W S =

11. CENTRIC OCCLUDING RELATION
IT RECORDING A CENTRIC RELATION AT ACCEPATABLE VERTICAL DIMENSION OF OCCLUSION
“ (Centric relation between maxilla and mandible at the proper vertical dimension of occlusion)

12. RECORDING JAW RELATIONSHIPS
Check denture foundation.
Establish facial contour.
Establish occlusal plane.
Maxillary face-bow record.
Determination of vertical dimension of centric occluding relation.
Equalize pressure of occluding forces.
Determine centric relation at the accepted vertical dimension.
Locking device ( recording the C.O.R. )

13. Check denture foundations.
Extension
Retention
Stability

14. 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.

17. Determination of occlusal plane
Aesthetic base.
Phonetic base.
Functional base.
Mechanical base.

22. Anterior occlusal plane :
Parallel to interpupillary line .

23. Posterior occlusal plane :
Parallel to the ala tragus line .

24. Determination of Vertical Dimension of Centric Occluding Relation

25. Variables Affecting V D R :
Short Term Variables :
Position of the patient's head .
Respiration.
Stress Situations .
Long Term Variables :
Loss of the properioceptives impulses from the
periodontal ligament.
2. Age.

27. Sequel Of Improper Registration Of V.D.0.
A . High Vertical Dimension Of Occlusion :
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.

28. Sequel Of Improper Registration Of V.D.0.
A . High Vertical Dimension Of Occlusion :
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.

29. High Vertical Dimension
Flabby Tissue

30. High Vertical Dimension
Obliterated
free-way space
High Plane of Occlusion

31. 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

32. Cheek Biting
Monoplane
Heavy Bite
No Horizontal Overlap

33. Angular Cheilitis
Corner of Mouth

34. 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.

35. RECORDING JAW RELATIONSHIPS
Check denture foundation.
Establish facial contour.
Establish occlusal plane.
Maxillary face-bow record.
Determination of vertical dimension of centric occluding relation.
Equalize pressure of occluding forces.
Determine centric relation at the accepted vertical dimension.
Locking device ( recording the C.O.R. )

36. FACE-BOWS
The 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

37. “A device used to locate the transverse hinge or the condylar axis.”
Types of Face Bows
Mandibular
“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.”

38. 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 are
in centric.

39. Maxillary Face Bow Components: Graduations on the rod Graduated
Condylar Rods
Infraorbital Pointer
Bite Fork
Tightening clamp
Universal Joint /
Jack Clamp
U Shaped Bow

41. Facia face bow

42. The ear-bow uses the external auditory

43. Maxillary Face Bow Record
1- Bite fork is heated and inserted into the rim .

44. Cont. Maxillary Face Bow Recordmm
2-The condylar axis is then determined

45. Cont. Maxillary Face Bow Record
4- Universal joint once tightened , never opened.

46. Maxillary Face Bow Transfer
1- The slide bar clamp is unscrewd to remove assembly
from the face.

47. Cont. Maxillary Face Bow Transfer
2- Assembly is now centralized on the articulator.

48. Equalize pressure of occluding forces
This means to produce even contact
between the upper and lower occlusion
blocks without displacement of denture
supporting tissues. This can only be
done on an easily displaceable material
such as softened wax.

50. 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

51. 1- Terminal hinge axis method

52. 2- Chew in technique

53. 3- Graphic tracing method

54. The resulting arrow represents
the centric and eccentric relations

55. TYPES OF TRACERS
A- Intraoral tracer
B- Extraoral tracer

56. 4- Check bite technique (Wax wafer method)

57. Methods to guide the mandible in centric relation
1- Tongue retrusion .
2- Swallowing .
3- Biting operator’s fingers .
4- Relaxation .
5- Fatigue .
6- Head position .
7- The temporalis muscle check .

58. Wax registration methodor
Check bites
Wax wafer method

59. Graphic tracing method
Excursive methods or
Graphic tracing method

60. Eccentric jaw relationships
Protrusive record
Right lateral record
Left lateral record

62. Locking device V shaped notches can be carved on
the upper occlusion rim and the final
closure is done on softened wax. The
imprints of these notches are used to
lock upper and lower occlusion blocks.