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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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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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.
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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