This document discusses different types of facebows used to transfer the spatial relationship of the maxilla to an articulator. It describes arbitrary, kinematic/hinge, and fascia type facebows. The kinematic facebow locates the true hinge axis most accurately within 5 mm. Arbitrary facebows use approximate reference points which can introduce errors. The document also outlines the parts of a facebow including the U-shaped frame, condylar rods, bite fork, locking device, and orbital pointer pin. It emphasizes the importance of using a facebow to accurately capture the patient's hinge axis for producing biologically acceptable restorations.

1. Presented By: Niharika
Supriya
Roll no: 42
B.D.S Final Year (Rama
University)

2.  Introduction
 Uses
 Classification
 Parts of Facebow
 Conclusion
 Bibliography

3.  Caliper like 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.
GPT-8
DEFINITION

4. Face bow record is used….
• Balanced occlusion in CD
• Class I & II cases
 – Open anterior bite or end to end relationship
 – Single restoration on II molar not for premolar
and I molar
 – Segmental restoration
 – Anterior restoration – primary guidance factor in
excursive movement
 – Restoration of entire quadrant
• Diagnostic purposes and Treatment planning

5. EARPIECE
TYPE
FACIA TYPE
FACEBOW
ARBITRARY FACEBOW KINEMATIC/HINGE FACEBOW

6.  The hinge axis is approximately located in
this type of face bow.
 It is commonly used for complete denture
construction.
 This type of face bows generally locate the
true Hinge axis within a range of 5 mm.

7.  Uses arbitrary or approximate points on the face
as the posterior points and condylar rods are
positioned on these point.
 As the located hinge axis is arbitrary, occlusal
discrepancies produced in the dentures should be
corrected by minor occlusal adjustments during
insertion.

8.  The fascia 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.

9. • 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.
DISADVANTAGES

10.  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.

11.  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
ADVANTAGES

12.  Regardless of which arbitrary position is
chosen 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 .
DISADVANTAGES

13.  It is 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.

14. When it is critical to precisely reproduce the
exact opening and closing movement of the
patient to the articulator.
Draw backs :
• Extensive chair side.
• Expensive
• Rarely indicated for routine articulators with
prosthodontic procedures.
INDICATIONS

15.  U-shaped frame
 Condylar rods
 Bite fork
 Locking device
 Orbital pointer pin

16.  It is a U-shaped metallic
frame,to which all the other
components of the facebow
are attached.
 It extends from the TMJ of
one side to the TMJ of the
other side,at least 2-3 inches
anterior to avoid contact.

17.  These are two caliberated
metal extensions fitted on
either side of the free end of
the U-shaped frame that are
placed on the determined
centre of the condyle.
 The caliberations on either
side are equalized (to centre
the facebow) and then
locked.

18.  It is a U-shaped rod which
is attached to the maxillary
occlusal rim while
recording the orientation
jaw relation.
 It is attached to the frame
with the help of a metal
rod called the “stem”.
 The bitefork should be
inserted about 3mm above
the occlusal surface into
the occlusal rim.

19.  This part of the face bow helps to
fix the bite fork to the U-shaped
frame firmly after recording the
orientation jaw relation.

20.  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.

21.  It helps in marking the
anterior reference point.
 It is adjusted after
marking the anterior
reference point on the
patient. This enables the
transfer of the third
reference point.

22.  TEXTBOOK OF PROSTHODONTICS
V. Rangarajan
T.V Padmanabhan
 Internet Source