The document discusses various classifications and types of facebows used in dentistry to record the spatial relationship of the maxillary arch to anatomic reference points. It covers advantages and disadvantages of each type, including arbitrary, kinematic, and ear piece types, while also detailing specific models and their features. The importance of accurate measurements and the potential for errors when using different facebow types are emphasized.

1. CLASSIFICATION OF
FACEBOW
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2. DEFINITIONS
A caliper-like device which is used to record the relationship of the
maxillae and/or mandible to the temporomandibular joints
(SNOW- 1802)

3. facebow fas bo: an instrument used to record the spatial
relationship of the maxillary arch to some anatomic reference
point or points and then transfer this relationship to an
articulator; it orients the dental cast in the same relationship to
the opening axis of the articulator; customarily the anatomic
references are the mandibular transverse horizontal axis and one
other selected anterior reference point (GPT 9)
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4. CLASSIFICATION
Face bow
Arbitrary Kinematic
Facia type Ear piece type

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6. ARBITRARY FACE BOW
• The hinge axis is approximately located in this type of face
bow.
• Complete denture construction.
• This type of face bows generally locate the true hinge axis
within a range of 5 mm.
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8. FACIA TYPE
• The facia type of face bow utilizes
approximate points on the skin over
the temporomandibular region as the
posterior reference points.
• These points are located by
measuring from certain anatomical
landmarks on the face.
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9. Disadvantage
• As the face bow is placed on the skin which is
movable there is a tendency for the condylar
rods to displace .
• Also requires an assistant to hold the face bow
in place.
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11. EAR PIECE TYPE
• It uses the external auditory meatus as an arbitrary reference
point which is aligned with ear pieces similar to those on a
stethoscope.
• Accurate relationship for most diagnostic and restorative
procedures.
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13. Advantage
• Simple to use.
• Do not require measurements on face
• As accurate as other face bows.
• It provides an average anatomic dimension between the
external auditory meatus and horizontal axis of mandible
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14. Disadvantage
• An error of 0.2 mm from the axis can be
expected, when coupled with the use of a thick
inter occlusal record made at an increased
vertical dimension.
• This factor can lead to considerable inaccuracy.
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15. SPRING BOW (HANAU’S FACE BOW)
• It is an earpiece face bow made of spring steel
and simply springs open and close to various head
widths.
• Designed to orient the occlusal plane to the
frankfort horizontal plane by means for a third
point of reference
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16. Features
• Autoclavable
• Self Centering
• Comfortable
• Rapid
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17. SLIDEMATIC FACE BOW
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• Type of ear piece face bow.
• Used with Denar articulator.
• It has an electronic device that
gives reading denoting one half of
the inter condylar distance.

18. GYSI FACEBOW
Constructed an
instrument for
registering the
condylar path and
used as facebow
also
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19. TWIRL BOW
• It is an earpiece type of face bow
• Allows the maxillary arch to be transferred to the
articulator without physically attaching the face-
bow to the articulator
• Relates the maxillary arch to FH plane
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20. WHIP MIX FACE BOW
• Ear piece type of face bow
• It has a built in hinge axis locator.
• Automatically locates the hinge axis when
the ear pieces are placed in the external
auditory meatus
• Has a nasion relator assembly with a
plastic nose piece
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21. KINEMATIC FACE BOW:
ACTUAL VALUE/ HINGE AXIS
• Used to determine and locate the exact hinge axis
points.
• Hinge axis of the mandible can be determined by a
clutch i.e., A segmented impression tray like device
attached onto the mandibular teeth with a suitable
rigid material such as impression plaster.
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22. Kinematic facebow
• The kinematic face bow allows
for the precise determination of
the patient's hinge axis
(terminal hinge axis).
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27. Thanks for watching………