Download - Articulators
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OdontotechnologyOdontotechnology
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Articulators
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Well adjusted occlusal rims united & casts returned to lab casts
mounted on an articulator so that the teeth can be set up
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Articulator•reproduces certain recorded relationship-position of the mandible in relation to the maxilla
•mechanical instrument designed to simulate the movements of the mandibular arch in relation to the maxillary arch
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Articulator• reproduces certain recorded
relationship
• simulate certain movements
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CJRCentric jaw relationship
ICP
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The jaw relationship in which maximal occlusal contact occurs
The position of the mandibule when the relationship of opposing occlusial surfaces provides for maximum planned contact and intercuspation
Tooth-determined position.
Intercuspal Position ICP
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Articulator• reproduces certain recorded
relationship
• simulate certain movements
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Mandibular movements (basic)
• Excursions of the mandible in 3 directions– Downward movement-opening of
the mouth(20 mm incisor separation-retruded arc of closure)
– Forward movement-protrusive(20+ & anterior translation of the condyles down the slope of the articular eminence-condylar path)
– Lateral movements –sidewaysworking side-to witch the mandible moves-immediate shide shift &rotation about vertical axisnon working side-condyle moves down and medially, Bennett Angle
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ADJUSTABILITY OF AN ARTICULATOR
The capability of the articulator to closely simulate the movements of the mandible (dependent on the adjustability of the
articulator elements)
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ELEMENTS OF AN ARTICULATOR
• horizontal axis of rotation: variability of the position of the horizontal axis of rotation in relationship to the maxillary dental cast
• condylar inclination/fossa components:variability of the angle of the eminentia, directional guidance of the superior, posterior and medial walls of the fossa, and ability to simuate laterotrusive movement
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ELEMENTS OF AN ARTICULATOR
• intercondylar distance: adjustability of the distance between the vertical axis of rotation
• Benett angle/Benett movement: adjustability of the angle and capability of stimuating sideshift movement
• incisal guidance: adjustability and ability to stimulate the anterior guidance of the natural dentition
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NON ADJUSTABLE-SIMPLE HINGE
• opening and closing around a fixed axis (maximum intercuspation is the only position reproduced)
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NON ADJUSTABLEClass II: Average value
• capable for lateral movement, some are cabaple of variable location of the horizontal axis of rotation
• all of this type have fixed, arbitrary condylar inclination settings, vertical axes of rotation settings, and Benett angle. No adjustment of these elements is available. Some have a provision for incisal guidance.
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NON ADJUSTABLE-AVERAGE VALUE
• condylar angle relative to occlusal plane in average patient: : 34° Condylus sagittalis
• Capable for lateral movement, : 15° Condylus lateralis
• Incisal guidance:10°
No adjustment of movements
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Casts mounted in an average position(average values)
Balkwill and Bonwill ▲s
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ADJUSTABLE
• SEMI • Fully
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ADJUSTABLEClass III: SEMI ADJUSTABLE
• simulate lateral, protrusive and Benett movements to varying degrees
• The amount of adjustability incorporated in the design provides the degree of simulation available.
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SEMI ADJUSTABLE ARTICULATOR
• ARCON: condylar elements are on the lower member of the articulator, mechanical fossae are placed on the upper member of the articulator
• NON ARCON: condylar path simulating the glenoid fossae are attached to the lower member, condylar elements are placed on the uper portion of the articulator
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FULLY ADJUSTABLE ARTICULATORS (IV.th year-gnathology)
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ADJUSTABLECLASS IV: FULLY ADJUSTABLE
• accepts registration of all anatomic determinant of occlusal morphology, and most closely simulates the movement directed by these controls
• the incisal guidance can closely simulate the paths of natural dentition
• With facebow: The function of the facebow is to record the relationship of the maxillary arch to the horizontal axis of rotation of the mandible
• this class is fully utilized in extensive restorative procedures, as well as adjunct to diagnostic determinations of TMJ dysfunction.
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FACEBOW instead of B & B ▲s