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Face bow horizontal orientation, Study notes of Dentistry

Central University of Tamil NaduDentistry

Final year Bds prosthodontics- this has notes of face bow

Typology: Study notes

2024/2025

Available from 06/07/2025

nadheera-manaal
nadheera-manaal 🇮🇳

2 documents

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bg1
FACEBOW
CONTENT:
ORIENTATION JAW RELATION
DEFINITION
HISTORY
TRUE HINGE AXIS
CLASSIFICATION
PARTS
PLANE OF ORIENTATION
STEPS INVOLVED
FACE BOW TRANSFER
SIGNIFICANCE
INDICATION
CONTRAINDICATION
RECENT ADVANCEMENT
CONCLUSION
ORIENTATION JAW
RELATION
Are those that orient the mandible to the cranium in such a way, that, when mandible
is kept in its most posterior position, the mandible can rotate in sagittal plane around an
imaginary transverse axis passing through or near the condyles. Orientation jaw relation gives
the angulation of the maxilla in relation to the base of the skull. It is necessary to do
orientation jaw relation before doing any other jaw relation. Use of face bow minimizes the
occlusal error in the restoration as the cast will be oriented as close to as they are in the
patient.
DEFINITION:
An instrument used to record the spatial relationship of the maxillary arch to some
anatomical reference points and then transfer this relationship to an articulator; it orients the
dental cast in same relationship to the opening axis of the articulator; customarily the
anatomical reference are the mandibular transverse horizontal axis and one other selected
anterior reference point- GPT 9.
HISTORY:
1880-HAYES-caliper with median incisal point localized in relation to the
two condyle
1890-WALKER-clinometer used to obtain the relative position of lower casr
in relation to condylar mechanism
GYSI- instrument for registering the condylar path and facebow
1899-SNOW-simple instrument which has become prototype for all the
facebow constructed in present days
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FACEBOW

CONTENT:

 ORIENTATION JAW RELATION

 DEFINITION

 HISTORY

 TRUE HINGE AXIS

 CLASSIFICATION

 PARTS

 PLANE OF ORIENTATION

 STEPS INVOLVED

 FACE BOW TRANSFER

 SIGNIFICANCE

 INDICATION

 CONTRAINDICATION

 RECENT ADVANCEMENT

 CONCLUSION

ORIENTATION JAW

RELATION

Are those that orient the mandible to the cranium in such a way, that, when mandible is kept in its most posterior position, the mandible can rotate in sagittal plane around an imaginary transverse axis passing through or near the condyles. Orientation jaw relation gives the angulation of the maxilla in relation to the base of the skull. It is necessary to do orientation jaw relation before doing any other jaw relation. Use of face bow minimizes the occlusal error in the restoration as the cast will be oriented as close to as they are in the patient. DEFINITION: An instrument used to record the spatial relationship of the maxillary arch to some anatomical reference points and then transfer this relationship to an articulator; it orients the dental cast in same relationship to the opening axis of the articulator; customarily the anatomical reference are the mandibular transverse horizontal axis and one other selected anterior reference point- GPT 9. HISTORY:  1880-HAYES-caliper with median incisal point localized in relation to the two condyle  1890-WALKER-clinometer used to obtain the relative position of lower casr in relation to condylar mechanism  GYSI- instrument for registering the condylar path and facebow  1899 -SNOW-simple instrument which has become prototype for all the facebow constructed in present days

TRUE HINGE AXIS:

It is the imaginary line between mandibular condyle around which the mandible can rotate within the sagittal plane. It allows for correct recording of centic relation and if transferred to articulator teeth contact each other in the articulator exactly as they do in the patient mouth When an incorrect axis is transferred to an articulator, teeth will b placed with any increase or decrease in vertical dimension of occlusion. The different schools of thought regarding the transverse hinge axis has led to the evolving of four main groups: Group I - absolute location of axis; Group II - arbitrary location of axis; Group III - non believers in transverse axis location; Group IV - split axis rotation. CLASSIFICATION: A.BASED ON EXACT TERMINAL HINGE AXIS LOCATION

 Requires assistant to hold the face bow in place D.BASED ON THE INTERCONDYLAR DISTANCE EQUILIBRATIONSpring bow o It is an earpiece face bow made of spring steel and simply springs open and close to various head widths. Most commonly used face bow (Hanau facebow) o Advantage  The one piece design of bow eliminates the moving parts and maintenance problems encountered with other models.  It is easy and efficient to use.  Parts of sterilizable parts and can be direct/indirectly mounting capability. o Disadvantage  Inabilities to measure intercondylar distance.  Calibrated condylar rods o Condylar rods are graduated. They adjusted bilaterally until equally reading are achieved on both sides  Slidematic face bow o Anterior horizontal arm of the bow composed of two sliding arms that allow for mediolateral movement of the bow till the 2 condylar rods contact the posterior reference points PARTS OF THE FACE BOW

PLANE OF ORIENTATION:

 The maxillary cast in the articulator is the baseline from which all occlusal relationships start. Therefore, it should be positioned in space by identifying three points of which two points are located posterior to the maxillae and one point located anterior to it.  The posterior points are referred to as the posterior points of reference and the anterior one is known as the anterior point of reference.  The spatial plane formed by joining the anterior and posterior reference points is called plane of orientation Fig- Ear piece Third reference point locater Bite fork stem Support bite fork index Bite fork Transfer rod Transfer jig U shaped frame or bow.

 A definitive cusp fossa or cusp to marginal ridge relation is desired.  When inter occlusal check record are used for verification of jaw position  When the occlusal vertical dimension is subjected to change and alternation of tooth occlusal surface are necessary to accommodate the change  To diagnose exiting occlusion in patient mouth CONTRA INDICATION: [Heartwell]

  1. When monoplane teeth are arranged on a plane in occlusal balance and the mandible is in the most retruded relation to the maxillae at an acceptable VD of a separation
  2. No alteration of occluding surfaces of the teeth that necessitates the changes in vertical dimension.
  3. No inter occlusion check reports that would be of different VD from that in the original inter occlusal record.
  4. Articulators developed not to receive face bow transfer RECENT ADVANCEMENT;Virtual Face bow o Using virtual procedure, the maxillary digital cast is transferred to a virtual articulator using reverse engineering device. Mandibular cast is oriented to maxillary cast using virtual interocclusal record o Instruments needed  Intraoral scanner  Digital camera  Software(Agisoft, Reverse engineering device) CONCLUSION: By using facebow the risk of occlusal errors are minimized thereby enhancing the accuracy of occlusion of the prosthesis upon insertion which facilitates patient comfort and acceptance to the prosthesis.