Complete Denture 4- Maxillo-mandibular Relation Records c- Face bow record and transfer

3. Dr. Amal Fathy Kaddah
Professor of Prosthodontics,
Faculty of Dentistry
Cairo University

5. ‫تجبه‬ ‫فال‬ ‫السفيه‬ ‫نطق‬ ‫إذا‬
...
‫السكوت‬ ‫إجابته‬ ‫من‬ ‫فخير‬
‫عنـه‬ ‫جت‬ّ‫فـر‬ ‫كلمته‬ ‫فإن‬
...
‫يمـوت‬ َ‫ا‬‫كـمد‬ ‫خليته‬ ‫وإن‬

7. RECORDING JAW RELATIONSHIPS
1. 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.)

8. Mounting the upper cast
1.By face bow record.
2.By Bonwill triangle.

9. TYPES OF FACE-BOWS
1. Mandibular or kinematic face-bow (hinge axis
face-bow). This locates the exact axis of
rotation of the condyles.
2- Maxillary face-bow
a. Kinematic facebow used to locate and
transfer true hinge axis.
b. Arbitrary face-bow This relates the maxilla to
the exact or arbitrary position of the condylar
axis and transfers this relationship to the
articulator.

10. Facebow record and Transfer
• Establishes the
relationship between the
maxillary arch and the
horizontal plane.
• Transfers this
this relationship
to the articulator.
Maxillary Face bow

11. Purpose
• To accurately mount the
maxillary cast to articulator
The facebow record transferred to
the articulator Important to prevent
occlusal errors

12. What if patient doesn’t match
articulator?
Articulator
Patient

13. Articulators
mha
aha

14. Articulators
We obtain a measurement of this distance
with a facebow
aha
mha
occlusal errors
The lnterocclusal wedge space will not be equal

15. • Therefore the distance from the condyle
to the teeth is crucial, we obtain a
measurement of this distance with a
facebow

16. Face-bow Function
• Duplicates opening and closing arc of
natural teeth by relating maxillary arch to
the hinge axis.
• Slight change of vertical dimension doesn’t
affect the relation

17. The first part of the
posterior border
opening is a rotation
around the hinge axis.
If the terminal hinge axis is recorded on
the articulator using a hinge face-bow, then
minor changes in the vertical dimension
will not alter the horizontal jaw relation.

18. N.B.
The face bow records not only the radius from the
condyles to the incisal contacts of the upper central
incisors but also the angular relationship of occlusal
plane to the axio-orbital plane, face bow must be
positioned on the articulator in the same axio-orbital
relation as on the patient.

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

21. 1 . Maxillary face-bow or ear-bow.
2 . Bite-fork.
3 . Bunsen burner
4. .Millimeter ruler.
5 . Indelible pencil (Transfer Sticks)
6 . Semi-adjustable articulator.
7 . Plaster bowl and spatula.
8 . A second maxillary record bases with
occlusion rim.
EQUIPMENT NECESSARY

22. Maxillary face-bow record
11-13 mm
11-13 mm
The condylar axis lies nearly 11
mm anterior to the tragus of
the ear on an imaginary line
between the outer canthus of
the eye and the upper surface
of the tragus of the ear or lies
13 mm in front of the anterior
margin of the external auditory
meatus.
1- Mark the relative position
of the condylar axis.

23. Cont. Maxillary Face Bow Record
The condylar axis
is determined
either arbitrarily or
by using
mandibular face
bow record.

24. Maxillary Face Bow Record
2- Bite fork is heated and inserted into the rim
midway its height and parallel to its plane.
Both are then placed intraorally together with the lower
occlusion block.
Edentulous Bite Fork: Allows
patient to close against the
opposing rim to stabilize the
record bases

25. 3- Insert occlusion block
in patient’s mouth and
keep it in place.
The lower occlusion
block may be used for
this purpose to support
the upper block.
Maxillary face-bow record

26. 4- Slip the clamp of face-bow on the
stem of bite fork. Let the clamp be
loose.
Maxillary face-bow record

27. A- Both condylar rods lie on cheek
marks.
B- Condylar rods show equal
calibration with slight tension.
Maxillary face-bow record
Adjustment of the condylar
rods of face-bow to the
width of the face in such a
way that:

28. Maxillary face-bow record
5- Adjust the infra-orbital pointer
6- Generally the intercondylar axis will
parallel the interpupillary plane. Check the
alignment of the face-bow with that plane.

29. 7- The universal joint attachment is then
tightened with the locknut and the entire
assembly is inspected to make certain that:
Maxillary face-bow record

30. Remember
When the patient’s face is centralized in the bow, all
clamps are tightened.
Notice position of the
Condylar Rods
Infraorbital Pointer
& Bite Fork.
Once the Universal joint
tightened, never opened.

31. A- The maxillary record base is properly
seated.
B- The fork parallels the occlusal plane.
C- The frame of the face-bow parallels the
interpupillary plane.
D- The condylar rods are just lightly contacting
the face over the arbitrarily located axis.
E- The condylar rods show equal readings.
F- All lock screws are firmly set.

32. Maxillary Face Bow Transfer
8- The slide bar clamp is unscrewed and
The entire assemblage is now removed
and transferred to the articulator.

33. Cont. Maxillary Face Bow Transfer
9- Assembly is now centralized on the articulator.
Again notice position of
- condylar rods
- infraorbital pointer
- L shaped bitefork bypassing incisal pin

34. Upper cast is mounted on
the articulator.

36. Hinge Axis Location
• Face-bow or
ear-bow used
• Record relationship
of maxilla to
transverse
horizontal hinge
axis of mandible

37. Edentulous Bite Fork:
Allows patient to close
against the opposing rim
to stabilize the record
bases

38. Finger cots can be used
over ear pieces for infection
control
Patient can
assist with
placement and
orientation in
external auditory
meatus
Nasion support

39. Heat bite fork and imbed
it centered and parallel
the occlusal plane

40. Orient in external
auditory meatus

41. Ball correctly placed inside slot will
ensure full range of anterior/posterior
movement of the toggle assembly
Ball placed in slot

42. Slide facebow onto
bitefork
Extend nasion
support& tighten

43. Tighten center
facebow screw
Set and tighten nasion
nosepiece

44. Release the record base
by breaking the seal, and
removing the facebow.
Tighten the Quick Lock
Toggle

45. Indirect jig with record base
on articulator

46. Place cast
support and
maxillary
mounting plate

47. Attach cast with
mounting plaster in
two steps

48. In Summary
• Facia Face-bow or
ear-bow used
• Record relationship
of maxilla to
transverse
horizontal hinge
axis of mandible

49. • Transferred to the articulator
• Important to prevent occlusal
errors, particularly when
cusped teeth are used in
dentures.
• Application and training
Hinge Axis Location