Articulato /certified fixed orthodontic courses by Indian dental academy


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  • Articulato /certified fixed orthodontic courses by Indian dental academy

    1. 1. ARTICULATORS INDIAN DENTAL ACDEMY Leader in continuing dental education
    2. 2. The Whip Mix Articulator, Model #8500
    3. 3. Positioning Nasion Relator on crossbar of face-bow.
    4. 4. ‘QUICKMOUNT’ Face-Bow in position on human skull.
    5. 5. Shows relation of face-bow earpiece to condyle.
    6. 6. While face-bow is in place, the condylar width is determined by marking on front in this instance. of face-bow-medium
    7. 7. Condyle elements are moved to center holes of lower frame to correspond to the ‘medium’ registration.
    8. 8. To adjust the upper frame of the articulator to the medium width, one spacer is removed from the shaft of the condylar guide on each side.
    9. 9. The condylar guides are set at 30° angulation in preparation for receiving face-bow registration.
    10. 10. The ‘QUICKMOUNT’ face-bow registration of the maxillary teeth is locked in position.
    11. 11. Transferring the face-bow registration to the articulator: • The holes in the earpieces are placed onto the pins extending from the condylar guides of the articulator.
    12. 12. Holding the face-bow arms firmly in place, the three locking screws are tightened.
    13. 13. The lower frame of the articulator is used as a support for the face-bow registration and upper frame of the articulator while mounting the upper cast.
    14. 14. The upper cast is placed into the registration of the face-bow
    15. 15. While supporting the face-bow fork, the upper arm of the articulator is brought down until it touches the cross member of the face-bow.
    16. 16. When Mounting Stone has hardened, the Incisal guide pin is replaced in the upper member of the articulator.
    17. 17. • The line that completely encircles the guide pin, when flush with the top of its supporting bushing, sets parallel the upper and lower arms of the articulator. • This pin should be set a 5mm opening in preparation for mounting lower cast. • Place round end of pin down if plastic incisal guide is used.
    18. 18. • If the Adjustable Incisal Guide is used, the chisel shaped end of the guide pin is used. • The guide is positioned so that the chisel edge of the pin rests on the small indentation in the center of the table.
    19. 19. The Incisal Guide Table is then locked into place with the hex driver used with the face-bow.
    20. 20. With the articulator inverted and using a centric relation registration, the lower cast is positioned onto the upper cast and Mounting Stone applied to the cast and mounting plate.
    21. 21. The lower frame is then pushed into place until the Incisal guide contacts the guide pins.
    22. 22. Front view of the skull with the two jaws in centric relation.
    23. 23. Side view showing position of condyles when mandible is in centric relation.
    24. 24. Front view with mandible in left lateral excursion. Wax registration of this movement is in place between the upper and lower teeth.
    25. 25. Left side view – with mandible in left lateral excursion, the left condyle www.indiandentalacademy.composition. remains in retruded
    26. 26. Right side view – at the same time the right condyle moves down and forward.
    27. 27. With this same lateral excursion registration transferred to the articulated casts, the right condyle of the articulator moves down and forward correspondingly. (Side plate of guide has been cut away to improve view)
    28. 28. To set this inclined movement into the articulator, the condylar guide is rotated downward until it touches the condyle element, then locked into position.
    29. 29. The side shift guide is moved laterally until it also contacts the right condyle elements, and locked into position.
    30. 30. Slide shift in position.
    31. 31. Left condyle has moved away from its side shift guide.
    32. 32. Front view of the skull with mandible in right lateral excursion.
    33. 33. In this movement, the right condyle remains in its retruded position.
    34. 34. The left condyle moves forward and down.
    35. 35. This registration is transferred to the articulated casts and the left side guidance of the instrument is adjusted in the same manner as the right side.
    36. 36. The skull and articulated casts are both in left lateral excursion position, but with the inclination of the eminentia set at an arbitrary angle slightly less on the articulator than that of the skull. The second and third molars of the casts are in closer relationship than are those of the skull.
    37. 37. With the articulator set at a slightly greater angle than exists in the skull, this piece is than it is on the skull. greater on the casts
    38. 38. Front view of articulated casts and skull, comparing the two while in left lateral excursion. (Settings of articulator are correct as registered by wax transfers)
    39. 39. View comparing the two while in right lateral excursion.
    40. 40. Side view of the two while in partial lateral excursion.
    41. 41. Permanent Incisal guide registration may be obtained by cutting guide path into plastic Incisal guide block.
    42. 42. Double exposure, superimposing the lower frame of the articulator, in corresponding position of the mandible, over the skull.
    43. 43. With the mandible removed, the skull is set in place onto the lower member of the articulator.
    44. 44. With the lower casts mounted on the articulator frame, it replaces the mandible of the skull.
    45. 45. Front view of entire articulator with mounting stone in place, superimposed by double exposure, over skull.
    46. 46. Front and side views of skull and articulated casts.
    47. 47. Dentoforms mounted on articulator, showing writing stylus in place in an attempt to trace articulator movements to compare different adjustments of the instrument.
    48. 48. Close-up showing method of mounting ball-point pen refill with selfcuring plastic to of the writing pen. only vertical movement
    49. 49. • Flat shim of fused porcelain was luted to the surface of ground away lower molar tooth with tacky sticky wax to receive ink markings. • With dentoforms in centric relation, the stylus rests on the approximate center of the lower left first molar tooth. • Moving the articulator into right lateral excursion will draw a line from center to buccal of tooth. • Left lateral excursion will mark from center to lingual of tooth.
    50. 50. The various paths caused by changing only the amount of side shift allowed, as indicated on the individual slides.
    51. 51. With amount of side shift constant but changing the condylar width.
    52. 52. With no side shift allowed, but again altering the condylar width.
    53. 53. Composite of several paths caused by changing the condylar width and the amount of side shift in various combinations.
    54. 54. Close-up views of front and both sides of the articulated casts in centric relation.
    55. 55. With the casts forced into left lateral excursion, but with no angulation of the eminentia, the third molars on the right side are in heavy contact.
    56. 56. No other teeth come close to meeting.
    57. 57. Setting the inclination to the ‘average’ 30°, the upper right second and third molar contact the right lower third molar.
    58. 58. The teeth on the left side are much closer, but still no actual contact.
    59. 59. The “check bite” registration taken from the skull set the condylar guidance at 42 ½ inclination. At this setting, the molar teeth on the right side come close into a very light contact.
    60. 60. While the teeth on the left side are in the best occlusion possible for these worn teeth.
    61. 61. With the inclination increased to 60°, none of the teeth on the right side come close to each other.
    62. 62. While on the left side only the cuspids make contact.
    63. 63. In an effort to check the authenticity of this 43 ½° setting, a strip of marking tape was applied to the right side of the skull crossing the condyle at a the face-bow while it angle to the arm of was in place on the skull.
    64. 64. The marking tape was cut in two at point centered over the condyle.
    65. 65. The mandible is moved into the left lateral exclusion position.
    66. 66. A protractor placed in relation to the two ends of the cut tape indicates 42 ½°. Close up of the protractor straight edge in relation to the end of the cut marking tape.
    67. 67. Thank you Leader in continuing dental education