Orientation jaw relation/ dentistry jobs
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This document discusses orientation jaw relations and the use of a facebow. It defines orientation jaw relations as the relationship between the mandible and cranium when the mandible is in its most retruded position. A facebow is used to record this relationship and transfer it to an articulator. It classifies different types of facebows and discusses their components and use. The accurate use of a facebow is important for obtaining an accurate occlusion on an articulator.
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Orientation jaw relation/ dentistry jobs
- 2. TODC-B'LORE.2005-06 Topics of Discussion Introduction Definitions Review of literature Classification Parts of facebow Discussion Conclusion Bibliography
- 3. TODC-B'LORE.2005-06 Introduction The maxillary arch has a definite 3- dimensional relationship to all condylar motions of the mandible.
- 4. TODC-B'LORE.2005-06 Jaw relations can be classified as 1.Orientation jaw relation 2. Vertical jaw relation 3. Horizontal jaw relation
- 5. TODC-B'LORE.2005-06 Orientation jaw relation Orientation jaw relations establishes the references in the cranium. The mandible rotates in the sagittal plane around an imaginary transverse axis passing through or near the condyles. This axis can be located by means of an instrument called FACEBOW
- 6. Orientation Jaw Relations are those relations that orient the mandible to the cranium in such a way that when the mandible is kept in its most retruded position with the maxilla, the mandible moves in sagittal plane around an imaginary transverse axis passing through the centre or near the condyles TODC-B'LORE.2005-06
- 7. TODC-B'LORE.2005-06 Facebow transfer is the first step in recording the relationship of the maxillary arch to the condylar paths on the articulator.
- 8. TODC-B'LORE.2005-06 Maxillomandibular relationship: any spatial relationship of the maxillae to the mandible; any one of the infinite relationships of the mandible to the maxillae [Gpt-99].
- 9. TODC-B'LORE.2005-06 Transverse horizontal axis: an imaginary line around which the mandible may rotate within the sagittal plane [Gpt-99].
- 10. TODC-B'LORE.2005-06 Retruded contact position: that guided occlusal relationship occurring at the most retruded position of the condyles in the joint cavities. A position that may be more retruded than the centric relation position [Gpt-99].
- 11. TODC-B'LORE.2005-06 Face-bow: a 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. Customarily, the anatomic references are the mandibular condyles transverse horizontal axis and one other selected anterior point; called also hingebow [Gpt-99].
- 12. TODC-B'LORE.2005-06 Review of literature In 1860 according to Bonwill, the distance from the centre of each condyle to the median incisal point of the lower teeth is 10 cm. He used this standard for mounting his casts in the articulator.
- 13. TODC-B'LORE.2005-06 In 1866 Balkwill designed an apparatus called “bite- frame”. In 1880 Hayes used tong like device which he called it “articulating caliper”. In 1894 George k Bagby devised an apparatus called “bagby jaw gage”.
- 14. TODC-B'LORE.2005-06 Walker invented FACIAL CLINOMETER to determine mandibular movements in 1896.
- 15. TODC-B'LORE.2005-06 A little later, at about the turn of century ALFERED GYSI developed an instrument similar to face bow primarily to record the path of the condyle.
- 16. TODC-B'LORE.2005-06 SNOW introduced face bow in 1899 and majority of the face bow used today are modifications of Snow's face bow.
- 17. TODC-B'LORE.2005-06 CLASSIFICATION OF FACE BOW Arbitrary Fascia Type Earpiece Type Twirl bow Spring bow Slidematic Kinematic
- 18. TODC-B'LORE.2005-06 ARBITRARY FACEBOW a device used to arbitrarily relate the maxillary cast to the condylar elements of an articulator. The position of the transverse horizontal axis is estimated on the face before using this device [Gpt-99].
- 19. TODC-B'LORE.2005-06 TYPES OF ARBITRARY FACEBOWS
- 24. TODC-B'LORE.2005-06 KINEMATIC FACE BOW a face-bow with adjustable caliper ends used to locate the transverse horizontal axis of the mandible [Gpt-99].
- 25. TODC-B'LORE.2005-06 Arbitrary vs. Kinematic Land marks Chair side time Facebow fork attachment Method Use
- 26. TODC-B'LORE.2005-06 BASIC PARTS OF A FACEBOW U shaped frame work. Condylar rods. Bite fork. Locking device Orbital pointer with clamp (optional). Additional features & parts vary according to types & brands.
- 33. TODC-B'LORE.2005-06 INDICATIONS OF FACEBOW Balanced occlusion is desired. Cusp form teeth are used. Interocclusal check records are used. Full mouth rehabilitation Diagnosis & treatment planning.
- 34. TODC-B'LORE.2005-06 Complete maxillary denture opposes a natural dentition Remounting of dentures
- 35. TODC-B'LORE.2005-06 Is facebow transfer essential in all cd cases?
- 36. TODC-B'LORE.2005-06 It is not required when Monoplane teeth are used No alterations to occlusal surface of teeth are done Articulators that do not accept facebow transfer
- 37. TODC-B'LORE.2005-06 ADVANTAGES OF FACEBOW Reduce errors in occlusion. More accurate programming of articulator. Supports the cast while mounting on the articulator. Assist in correctly locating the incisal plane
- 38. TODC-B'LORE.2005-06 SOME COMMONLY USED ANTERIOR REFERENCE POINT Orbitale Orbital minus 7mm Nasion minus 23mm Ala of the nose 43 mm superior from lower border of upper lip (Denar reference plane locator).
- 39. TODC-B'LORE.2005-06 SOME COMMONLY USED POSTERIOR REFERENCE POINT Bregstrom point Beyron point
- 40. TODC-B'LORE.2005-06 COMMONLY USED PLANES OF ORIENTATION DURING FACEBOW TRANSFERS Axis – orbitale plane. Frankfort plane. Camper’s plane. Axis – Nasion plane.
- 41. TODC-B'LORE.2005-06 Pre-requisites for facebow transfer Check for Lip support Plane of occlusion Reference lines Midline High lip line Canine line
- 42. TODC-B'LORE.2005-06 Techniques to record face bow A separate transfer record base is recommended for transferring maxillary cast to articulator If same record base is used for centric record transfer record can be made prior to centric record transfer record can be made after centric record
- 43. TODC-B'LORE.2005-06 PROCEDURE FOR FACE BOW TRANSFER USING ARBITRARY FACEBOW Posterior reference point is measured and marked. Condylar rod or earpiece is positioned on posterior reference point The locking nuts are then secured.
- 44. TODC-B'LORE.2005-06 The Bite fork is attached to the maxillary occlusal Rim. Occlusal rim are inserted into patient mouth. The midline of bite fork should coincide with the midline of the maxillary occlusal rim.
- 45. TODC-B'LORE.2005-06 PROCEDURE FOR FACEBOW TRANSFER USING KINEMATIC FACEBOW Facebow is attached to the lower jaw by means of clutch. Graph of Grid paper is placed near temperomandibula r joint region detects the stylus movement.
- 46. TODC-B'LORE.2005-06 Patient is asked to open and close the mandible at centric. Initial movement of the stylus may be arc shaped. The stylus is adjusted until the tip rotates instead of arcing. This point identified as the hinge axis is tattooed on the skin.
- 47. TODC-B'LORE.2005-06 ERRORS IN RECORDING HINGE AXIS Movement of the skin over the condyle during registration. Tipping of Base will invalidate the eventual recording. The angle of opening movement is small about 10-12 degrees and thus the arc of movement of the stylus is small.
- 48. TODC-B'LORE.2005-06 The bite fork shaft should be at the left of patient’s midline
- 50. TODC-B'LORE.2005-06 The bite fork clamp is slid onto the shaft
- 51. TODC-B'LORE.2005-06 Open the bow by pulling outward on the arms and then swing it down into position, placing an earpiece gently into each external auditory meatus.
- 52. TODC-B'LORE.2005-06 Have the patient adjust the facebow into a comfortable position.
- 53. TODC-B'LORE.2005-06 The infra orbital notch is located and marked.
- 54. TODC-B'LORE.2005-06 The pointer is rotated toward the reference mark
- 55. TODC-B'LORE.2005-06 The bow is secured with one hand while the thumbscrews on the assembly with the other hand.
- 56. TODC-B'LORE.2005-06 The thumbscrews are tightened in order: 1, 2, 3. from left to right.
- 57. TODC-B'LORE.2005-06 Rotate the orbital pointer away from the eye. Have the patient remove the earpieces from the auditory meati
- 58. TODC-B'LORE.2005-06 Preparing the articulator for Mounting
- 62. TODC-B'LORE.2005-06 Attach the mounting guide / platform to the lower member of the articulator
- 63. TODC-B'LORE.2005-06 Place the vertical transfer rod of the facebow assembly into the hole at the front of the mounting guide and secure it by a screw
- 64. TODC-B'LORE.2005-06 Carefully seat the maxillary cast on the bite fork. Mounting of the maxillary cast is done.
- 65. TODC-B'LORE.2005-06 CONCLUSION Though blind orientation of maxillary cast may result in an error so slight that a facebow appears unnecessary, however since the procedure is not complicated, not time consuming, the chances of incorporating an error should not be taken. Any error that can be eliminated in denture construction will make physiologic acceptance of denture easier.
- 66. TODC-B'LORE.2005-06 BIBLIOGRAPHY Prosthodontic treatment for edentulousProsthodontic treatment for edentulous patient-(8patient-(8th,th, 1111thth , 12, 12thth ,),) BoucherBoucher Syllabus of Complete Denture-Syllabus of Complete Denture- HartwellHartwell Essentials of complete denture-Essentials of complete denture- WinklerWinkler Complete Denture Prosthodontics John J SharryJohn J Sharry
- 67. TODC-B'LORE.2005-06 The Glossary of Prosthodontic Terms JPD-1953,VOL.3 JPD-1979,VOL.41,NO.5 JPD-2000,VOL.9,NO.3