Classification of facebow
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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.
Classification of facebow
- 1. CLASSIFICATION OF FACEBOW Dr Aaryas Vlogs
- 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) Dr Aaryas Vlogs
- 4. CLASSIFICATION Face bow Arbitrary Kinematic Facia type Ear piece type
- 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. Dr Aaryas Vlogs
- 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. Dr Aaryas Vlogs
- 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. Dr Aaryas Vlogs
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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. Dr Aaryas Vlogs
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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 Dr Aaryas Vlogs
- 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. Dr Aaryas Vlogs
- 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 Dr Aaryas Vlogs
- 16. Features • Autoclavable • Self Centering • Comfortable • Rapid Dr Aaryas Vlogs
- 17. SLIDEMATIC FACE BOW Dr Aaryas Vlogs • 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 Dr Aaryas Vlogs
- 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 Dr Aaryas Vlogs
- 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 Dr Aaryas Vlogs
- 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. Dr Aaryas Vlogs
- 22. Kinematic facebow • The kinematic face bow allows for the precise determination of the patient's hinge axis (terminal hinge axis). Dr Aaryas Vlogs
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