orientation jaw relation

3. • Introduction
• Orientation jaw relation
• School of thoughts
• Face bow record
• Conclusion
• References

4. Three dimensional spatial relationship of maxilla to the
mandible.
According to Boucher , jaw relation can be classified as:
Establish reference in the cranium.
Establish the amount of jaw separation allowable
for the denture.
Establish front to back and side to side relation of
one jaw to other.

5. • Are those that orient
the mandible to the
cranium in such a way,
that, when mandible is
kept in its most anterior
and superior position,
the mandible can rotate
in sagittal plane around
an imaginary transverse
axis passing through or
near the condyles.
– Boucher 12th Ed.

6. • An imaginary line around which the
mandible may rotate within the
sagittal plane. – TRANSVERSE AXIS
– GPT-8
• Any vertical plane or section
parallel to the median plane of the
body, that divides a body into right
and left portions.
GPT -8

7. • Also called the Retruded
contact position, it is that
guided occlusal
relationship, occurring at
the most retruded position
of the condyles in joint
cavities. GPT -8.
• Maximum range of terminal
hinge rotation- about 12˚
• Inter incisal opening: 18-25
mm

9. • A calliper like instrument
used to record the spatial
relationship of the maxillary
arch to some anatomic
reference points, and then
transfer this relationship to
an articulator. (GPT-8)

10. • It orients the dental cast in
same relationship to the
opening axis of articulator.
• Customarily the anatomic
references are the
mandibular condyles
transverse horizontal axis
and one other selected
anterior point.
• Also called Hinge bow,
Earbow, Kinematic facebow.
(GPT-8)

11. • Two basic types
– Kinematic
And
- Arbitrary
- Facia type
- Earpiece type.

12. • U SHAPE
FRAME
• CONDYLAR
RODS
• LOCKING
DEVICE
• BITE FORK
• ORBITAL
POINTER

13. • It is large enough to extent
from the region of one TMJ
around the front of the
face(5 to 7.5 cm in front) to
the other TMJ and wide
enough to avoid contacts
with the sides of the face.

14. • It is the part that contacts
the skin near the TMJ.

15. • It is that part that
attaches to the
occlusal rims.

16. • The fork attaches to the
face bow by means of a
locking device, which
also serves to support
the face bow, the
maxillary occlusal rim
and the maxillary cast
while the cast are being
attached to the
articulator.

17. • It is designed to
mark the anterior
reference point
(infraorbital
notch)and can be
locked in position
with a clamp. It is
present in the
arbitrary face-bow.

18. The spatial plane formed by
joining the anterior and
posterior reference points.
The horizontal plane is
established on the face of the
patient by 1 anterior & 2
posterior points, from which
measurements of the
posterior anatomic
determinants of occlusion and
mandibular motion are
made”.

20. 1. Orbitale (B) Located by Hanau
facebow with help of orbital pointer.
2. Orbitale minus 7 mm. (C) This plane
represents Frankfort plane.
3. Nasion (A) Used with quick mount
facebow (Whip mix)
4. Ala of nose (D) This plane represents
campers plane
5. 43 mm superior from lower border
of upper lip (Denar reference plane
locator – Denar facebow uses this
reference point)

21. • Lowest Point on the infraorbital
rim, palpated through tissue and skin.
• One orbit and two posterior points
determine the Axis-Orbital plane.
• It is used because of ease of location
and the concept is easy to teach and
understand.

22. • The F-H plane passes through
both porion and orbital point.
• Because porion is a fixed point on
the skull it is considered as a posterior
landmark on the patient.
• Most articulator do not have reference
point of this landmark .

23. • According to Sicher, another skull
landmark Nasion is located in the
head as the deepest part of the
midline depression just below the
level of the eyebrow.
• The nasion guide is designed to
be used with whipmix articulator,
which fits in the depression.

24. • The tentative occlusal plane should
be parallel to horizontal plane.
• This can be achieved in 2 ways-
The line from the alae of the nose
to centre of the auditory meatus -
Camper’s line.
1. Pointer on right or left alae
2. Occlusal rim parallel to
camper line ,transfer with
face bow .

25. • Determines which plane in the head will become
the plane of reference.
• Determines the level at which the casts are
mounted
• To establish a baseline for comparative studies
between patient.
• Can visualize anterior teeth & occlusion in the
articulator in the same frame of reference.

26. • Posterior reference points
A. Beyron point – 13 mm anterior to
posterior margin of tragus of
outer canthus of eye
B. Gysi – 13mm anterior to anterior
margin of EOM
C. Snow – 11 -13 mm ant to tragus
D. Denar’s – 12 mm ant to post
border of tragus and 5 mm inferior
to line from EOM and outer
canthus

27. The position of the terminal hinge axis on
either side of the face is generally taken as the
posterior reference points.

29. The Patient is seated in a
comfortable position with
his head upright and
supported by a headrest.
A point is marked 13 mm in front
of the auditory meatus on a line
running from the outer canthus
to the superior border of tragus.

30. A notch index about 2mm
deep is made in first molar
region. This helps to position
of facebow.
The maxillary and mandibular
occlusal rims are inserted in
patient’s mouth.

31. Aluwax is softened and shaped
to the form of a horseshoe. The
bite fork is embedded into this
soft wax. The thickness of the
bite fork and the wax together
should not be more than 6mm.
The bite fork with wax is
inserted into the patient’s
mouth. The midline of the
bitefork should coincide with
the mid line of the maxillary
occlusal rims. The stem of the
bite fork should be parallel to
the sagital plane.

32. With bite fork in position
face bow is guided onto
the stem of the bite fork .
Thumbscrews tightened
to maintain the spatial
relationships between
face bow and bite fork.

33. Face bow assembly
along with bite fork is
removed from the
mouth and positioned
in the articulator

34. • The kinematic face bow
allows for the precise
determination of the
patient's hinge axis
(terminal hinge axis).

35. • Fabrication of the clutch.
• Attach clutch tray to lower teeth.
• Assemble the hinge axis locator.
• Attach the side arms to the cross bar in mounting column.
• Attach the assembled hinge axis locator to the Stem of the
clutch tray.
• Mark approximate center of condyle on the subject`s face.
• Adjust the hinge axis locator.
• Place the graph paper .
• Location of the hinge axis points.

36. This face bow takes
its name from the fact
that it rests upon the
face, like the
kinematic bow.

37. • This type of face
bows uses the
external auditory
meatus as an
arbitrary reference
point which is
aligned with ear
pieces.

38. Today there are more advanced techniques
that make use of ultrasonic arcs, connected to
computers with graphical representations and
parameter calculations for programming the
articulator.

39. • A definite cusp fossa or cusp tip to tip incline relation
is desired.
• When interocclusal check records are used for
verification of jaw positions.
• When the occlusal vertical dimension is subjected to
change, and alterations of tooth occlusal surfaces are
necessary to accommodate the change.
• To diagnose existing occlusion in patients mouth

40. • Monoplane teeth are arranged in balance occlusion and
mandible in most retruded position at acceptable VD.
• No intended change in VDO.
• Articulator doesn't accept the transfer.

41. • Failure to use the face bow leads to error in
occlusion.
• Hinge axis is a component of every masticatory
movement of the mandible and therefore cannot
be disregarded and this hinge axis should be
accurately captured and transferred to the
articulator. So it becomes a fine representative of
the patient and biologically acceptable restoration
is possible.
• Whatever may be controversy reasoned by in the
use of face bow but it should form a integral part
of one prosthodontic treatment.

42. • Boucher's Prosthodontic treatment for
edentulous patient 10th edition.
• Essentials of complete Denture Prosthodontics
by Sheldon Winkler-2nd edition.
• Syllabus of complete dentures by Charles M.
Heartwell 4th edition 5th edition.