CR/Casts/Articulators Flashcards
What are 5 uses of diagnostic casts?
- Diagnostic Waxing
- Provisional Fabrication
- Survey and Design
- Radiograhic Guides and Surgical Templates
- Design Custom Trays
What are 9 uses of diagnostic mounting?
- Simulation of jaw movements
- Analysis of occlusal plane
- Critical Analysis of Occlusion and disoclusion
- Visualization of anatomy and restorations/how they relate to the opposing arch
- Abutment size and angulation
- Diagnostic Preparations
- Analysis of Available Restorative Space
- Analysis of Edentulous Spans
- Morphology of tissues and edentulous ridges
What 4 things does a 3 Piece Cast Analysis Provide?
- Instant Equilibration
- Evaluation of Anterior Coupling
- Mutually Protected Articulation
- Reasonableness of Restoring in CR
What 6 things must take place ACCURATLEY to a good diagnostic mounting?
- Alginate Impressions
- Diagnostic Casts
- Facebow Record
- Semi-Adjustable Articulator
- CR Records
- Lateral and/or Protrusive Records
What is a facebow?
A caliper like instrument used to RECORD SPATIAL RELATIONSHIP OF THE MAXILLARY ARCH TO SOME ANATOMIC REFERENCE POINT(S) and then transfer this relationship to an articulator
If using a facebow to mount max cast, be sure to set the condylar inclination at…
30 of “FB”
What is an articulator?
A mechanical instrument that represents the temporomandibular joints and jaws, to which maxillary and mandibular casts may be attached to SIMULATE some or all mandibular movements.
What is an Arcon articulator
Condyle on mandibular element
What is a Non-Arcon articulator
Condyle on the maxillary element
Define CR…
The maxilla mandibular relationship in which the condyles articulate with the thinnest avascular portion of their respective disks with the complex in the anterior-superior position against the slopes of the articular eminencies. This position is INDEPENDENT of tooth contact.
In CR, the condyle is restricted to which movements?
Purely rotary movement about the transverse horizontal axis
What are 5 characteristics of recording CR?
- Physiologic
- Comfortable
- Consistent When Made
- Repeatable Over Time
- Not Operator Dependent
What are 4 clinical methods of recording CR?
- Chin Point Guidance
- Bimanual Manipulation
- Leaf Gauge
- Lucia Jig
Define Working Side…
The side toward which the mandible moves in a lateral excursion
Define Nonworking Side…
The side of the mandible that moves towards the median line in a lateral excursion. The condyle on that side is referred to as the nonworking side condyle
Define Centric Occlusion (CO)
Occlusion when teeth touch in Centric Relation
What measurement to you set the inclination of the eminence and laterotrustion (Bennet Angle) on Whipmix articulator?
Position approximately canine to canine or 6 mm lateral
What are the 4 steps to mounting casts?
- Relate maxillary cast to the condylar axis (facebow)
- Relate the mandibular cast to the maxillary cast in centric relation position (CR record)
- VERIFY the accuracy of the mounting
- 1st point of contact
- Full arch occlusion record - Set the OVD in MIP (Incisal Guide Pin)
What side of bite registration do you trim?
Mandibular Side Only!
What percent of patients will not be accepted by Whip Mix Articulator?
20% due to Surtrusion of Retrusion
What 2 numbers do you record on the sides of your diagnostic casts?
- Record Angle of Eminence
2. Laterotrusion
