![ Bonwill triangle [William Gibson
Arlington Bonwill, American dentist,
1833-1899]:
eponym for a 4 inch equilateral
triangle bounded by lines connecting
the contact points of the mandibular
central incisor’s incisal edge (or the
mid-line of the mandibular residual
ridge) to each condyle (usually its mid
point) and from one condyle to the
other.](https://image.slidesharecdn.com/8-151122091443-lva1-app6892/75/articulators-23-2048.jpg)
More Related Content
![Apporach to lung biopsy [Auto-saved].pptx latest](https://cdn.slidesharecdn.com/ss_thumbnails/apporachtolungbiopsyauto-saved-251211225655-93258539-thumbnail.jpg?width=640&height=640&fit=bounds)
articulators
- 2.
- 3. Learning outcomes 1. Definean articulator. 2. List the uses and requirements of articulators. 3. Explain the different types of articulators and facebows. 4. Compare arcon and non arcon articulators.
- 4. ARTICULATOR A mechanical instrumentthat represents the temporomandibular joints and jaws, to which maxillary and mandibular casts may be attached to simulate some or all mandibular movements.
- 5.
- 6. The articulatorhelps to maintain the desired maxillomandibular relationship of the casts during tooth arrangement. Thus, it makes it possible to arrange teeth in the absence of the patient.
- 7. Uses of anArticulator 1. Mounting dental casts for diagnosis, treatment planning and patient presentation.
- 8. 2. Arrangement ofartificial teeth for complete and removable partial dentures.
- 9. 3. Wax-up andrefining the occlusion for dental restorations.
- 10. 4. Articulators canbe helpful in studying of occlusion and mandibular movements.
- 11. 5. To aidin fabrication of dental restorations and lost dental parts.
- 12. Requirements of an Articulator The articulator should have the following minimal requirements: 1. It should hold the casts in the correct horizontal relationship and vertical relationship. 2. It should provide positive anterior vertical stop (the incisal pin).
- 14. 3. It shouldaccept a face bow record. 4. It should open and close in a hinge movement.
- 15. 5. The movingparts should move freely and be machined accurately. 6. The non-moving parts should be of rigid construction. 7. It should allow protrusive and lateral jaw motion.
- 16. Classification of articulators Class I Articulators (Non-adjustable articulators) Class II Articulators (Average-value articulators) Class III Articulators (Semi-adjustable articulators) Class IV Articulators (Fully-adjustable articulators)
- 18. Class I Articulators (Non-adjustablearticulators or simple hinge or plane line articulators)
- 19. A simpleholding instrument capable of accepting a single static registration. Vertical motion is possible.
- 20. Class II Articulators (Average-valuearticulators or mean value articulator)
- 21. Instrument thatpermit horizontal as well as vertical motion but do not orient the motion to the temporomandibular joints via a face-bow transfer.
- 22. It allowslimited range of protrusive and lateral movements It has fixed horizontal condylar guidance of 30 degrees. It has fixed incisal guidance. It has fixed inter-condylar distance.
- 23. Bonwill triangle[William Gibson Arlington Bonwill, American dentist, 1833-1899]: eponym for a 4 inch equilateral triangle bounded by lines connecting the contact points of the mandibular central incisor’s incisal edge (or the mid-line of the mandibular residual ridge) to each condyle (usually its mid point) and from one condyle to the other.
- 24.
- 25. Bonwill's brass wire anatomicalarticulator
- 26.
- 27. Mean Value Articulator 100mm 100 mm 100 mm 100 mm 4 inch 4inch 4inch
- 28. Class III Articulators (Semi-adjustablearticulators)
- 29. An instrumentthat simulates condylar pathways by using averages or mechanical equivalents for all or part of the motion; may be arcon or nonarcon instruments.
- 30. Arcon The term ‘ARCON’was derived by Bergstrom from the words ARticulator CONdyle.
- 31. Arcon articulator:This instrument maintains anatomic guidelines by the use of condylar analogs in the mandibular element and fossae assemblies within the maxillary element.
- 32. Eg: Hanau Universityseries Whipmix condylar analogs fossae assemblies
- 33. The Condylarelement / analog / sphere attached to – Lower Member The Condylar guidance / Fossae assemblies (~Glenoid Fossa) attached to – Upper Member
- 34. Nonarcon articulatoror condylar articulators: an articulator whose condylar path components are part of the lower member and whose condylar replica components are part of the upper member.
- 35.
- 36. This articulatoris the reverse of the TMJ The Condylar Element / analog / sphere attached to – Upper Member The Condylar Guidance / track/ Fossae assemblies (~Glenoid Fossa) attached to – Lower Member
- 38. Semi adjustablearticulators are designed to be adjusted so that the articulator movements will simulate the jaw movements of the patient.
- 39. The condyletravels a curved path in mandibular movements. This is reproduced in semi-adjustable articulators as a straight path.
- 40. They haveadjustable horizontal condylar guides.
- 41. This typeof articulator can accept the following records: 1. Face bow (arbitrary) record to mount the upper cast. 2. Centric relation record to mount the lower cast. 3. Protrusive record, to adjust the articulator's horizontal guidance, that correspond to the patient's horizontal condylar path inclination.
- 43.
- 48. The lateralcondylar guidance is adjusted according to the Hanau's formula: L = H/8+12 L: The lateral condylar inclination. H: The horizontal condylar inclination.
- 49.
- 50. 4. They havea fixed intercondylar distance of about 110 mm.
- 51. Class IV Articulators (Fully-adjustablearticulators)
- 52. Fully adjustablearticulators have a complex condylar mechanism which is adjustable in horizontal, sagittal and frontal planes to replicate three dimensional movement of mandibular motion.
- 53. Simulate mandibularmovements with high degree of accuracy. Used for complex fixed partial denture construction, treating TMJ problems and full mouth reconstruction. All are arcon instruments Egs: Stuart articulator, Denar D4A articulator
- 56. This typeof articulator can accept the following records: 1. Face bow (Kinematic face bow) record to mount the upper cast.
- 57. 2. Centric relationrecord to mount the lower cast. 3. Protrusive record, to adjust the articulator's horizontal guidance, that correspond to the patient's horizontal condylar path inclination.
- 58. 4. Rightand left relation records, to adjust Bennett angle. 5. They have an adjustable intercondylar distance.
- 60.
- 61.
- 62. BASIC PARTS OFA HANAU ARTICULATOR Upper member - Represents the Maxilla Lower member - Represents the Mandible Condylar Track - Represents the Glenoid Fossa Condylar Element - Represents the Condyle Vertical Rod (Incisal Pin) Incisal guide table Orbitale indicator (for face bow
- 63. Condylar guidance Upper member Mountingplate Incisal pin (Vertical rod) Incisal guide tableLower member Condylar element Mounting plate NON-ARCON HANAU ARTICULATOR
- 64.
- 65. The HANAU™Wide-Vue Articulators are classified as semi-adjustable. They are of Arcon principle.
- 66. Wide Vue– lingually unobstructed vision
- 67. The maxillarycast is oriented to the upper member which represents the maxilla by a face-bow record.
- 68. The mandibularcast is oriented to the lower member which represents the mandible by a relating the lower cast to the upper cast through a centric interocclusal record.
- 69. Adjustable HorizontalCondylar Guidance (-20 degrees to +60 degrees) It is adjusted by a protrusive record.
- 70. Adjustable Bennettangle or lateral condylar guidance (0 degrees to 30 degrees) Bennett angle (L) = H/8+12
- 71. Adjustable Incisal guidetable (0 degrees to 20 degrees) adjustments adjustments
- 72.
- 73. Use of facebowon patient
- 74. Spring Bow withbite fork transferred to the articulator
- 75.
- 76.
- 78.
- 79. Face bow isa caliper like device used to record the relationship of maxilla to the temporomandibul ar joint. FACEBOW
- 81.
- 82. Conventional face bowEar piece face bow Semi-adjustable articulators Kinematic face bow - Fully adjustable articulators
- 83. ADVANTAGES OF THEFACE BOW Reduces errors in occlusion. Permits more accurate programming of the articulator. Supports the maxillary cast while transferring on the articulator.
- 85.