Mean Value Articulator
- 6. Condylar guidance Incisal guide table /incisal guidance Mid- incisal pin Upper member Incisal rod Supporting rod Lower member Mounting plate Thumbscrew
- 7. 300
- 9. • A 4-inch equilateral triangle bounded by lines connecting the contact points of the mandibular central incisor’s incisal edge (or the midline of the mandibular residual ridge) to each condyle (usually its midpoint) and from one condyle to the other. William Gibson Arlington Bonwill, dentist, U.S.A., 1833-1899; first used by Bonwill in 1858
- 12. Condylar guidance 300 300 Incisal guidance 150 150 Intercondylar distance 4” (110 mm) 110 mm
- 13. Based on theories of occlusion Bonwill’s Theory Conical Theory (Hall) Spherical Theory (Monsoon)
- 14. Based on adjustability Non- adjustable Semi- adjustable Fully- adjustable Rihani A (1980) | Gillis, Boucher and Kingery
- 15. Based on Ar-Con Principle Non- Arcon Arcon Bergstrom
- 16. Sharry’s Classification Class I Simple Class II Hinge type Class III Fixed Guide type Class IV Adjustable
- 17. Based on instrument function Class I a simple holding instrument capable of accepting a single static registration; vertical motion is possible; syn, NONADJUSTABLE ARTICULATOR Class II an instrument that permits horizontal as well as vertical motion but does not orient the motion to the temporomandibular joints Class III an instrument that simulates condylar pathways by using averages or mechanical equivalents for all or part of the motion; these instruments allow for orientation of the casts relative to the joints and may be arcon or nonarcon instruments; syn, SEMIADJUSTABLE ARTICULATOR Class IV an instrument that will accept 3D dynamic registrations; these instruments allow for orientation of the casts to the temporomandibular joints and simulation of mandibular movements; syn, FULLY ADJUSTABLE ARTICULATOR, International Prosthodontic Workshop, University of Michigan (1972); GPT-9
- 19. Incisive papilla Canine papilla canine (CPC) line Crest of residual alveolar ridge Midline Maxillary cast
- 20. Retromolar pad (in thirds) Crest of residual alveolar ridge Mandibular cast
- 21. Follow the arch form Anterior proclination 450 cut at the tuberosity 6 mm 8 mm 18 mm 22 mm Maxillary occlusal rim
- 22. Mandibular occlusal rim 6 mm 8 mm 18 mm 2/3 of retromolar pad Follow the arch form No anterior proclination Ensure flat occlusal surface
- 23. Mark the notches with a scale and pencil 15 mm 5 mm 5 mm
- 24. Cut the notches with a sharp Stanley knife Final indexing Ensure sharp edges Hold the knife at 450
- 25. Seal the occlusal wax rims Orient them to the articulator using modelling clay Mount the maxillary cast Mount the mandibular cast Verify