CR/Casts/Articulators

Question 1

What are 5 uses of diagnostic casts?

Answer 1

1. Diagnostic Waxing
2. Provisional Fabrication
3. Survey and Design
4. Radiograhic Guides and Surgical Templates
5. Design Custom Trays

Question 2

What are 9 uses of diagnostic mounting?

Answer 2

1. Simulation of jaw movements
2. Analysis of occlusal plane
3. Critical Analysis of Occlusion and disoclusion
4. Visualization of anatomy and restorations/how they relate to the opposing arch
5. Abutment size and angulation
6. Diagnostic Preparations
7. Analysis of Available Restorative Space
8. Analysis of Edentulous Spans
9. Morphology of tissues and edentulous ridges

Question 3

What 4 things does a 3 Piece Cast Analysis Provide?

Answer 3

1. Instant Equilibration
2. Evaluation of Anterior Coupling
3. Mutually Protected Articulation
4. Reasonableness of Restoring in CR

Question 4

What 6 things must take place ACCURATLEY to a good diagnostic mounting?

Answer 4

1. Alginate Impressions
2. Diagnostic Casts
3. Facebow Record
4. Semi-Adjustable Articulator
5. CR Records
6. Lateral and/or Protrusive Records

Question 5

What is a facebow?

Answer 5

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

Question 6

If using a facebow to mount max cast, be sure to set the condylar inclination at…

Answer 6

30 of “FB”

Question 7

What is an articulator?

Answer 7

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.

Question 8

What is an Arcon articulator

Answer 8

Condyle on mandibular element

Question 9

What is a Non-Arcon articulator

Answer 9

Condyle on the maxillary element

Question 10

Define CR…

Answer 10

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.

Question 11

In CR, the condyle is restricted to which movements?

Answer 11

Purely rotary movement about the transverse horizontal axis

Question 12

What are 5 characteristics of recording CR?

Answer 12

1. Physiologic
2. Comfortable
3. Consistent When Made
4. Repeatable Over Time
5. Not Operator Dependent

Question 13

What are 4 clinical methods of recording CR?

Answer 13

1. Chin Point Guidance
2. Bimanual Manipulation
3. Leaf Gauge
4. Lucia Jig

Question 14

Define Working Side…

Answer 14

The side toward which the mandible moves in a lateral excursion

Question 15

Define Nonworking Side…

Answer 15

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

Question 16

Define Centric Occlusion (CO)

Answer 16

Occlusion when teeth touch in Centric Relation

Question 17

What measurement to you set the inclination of the eminence and laterotrustion (Bennet Angle) on Whipmix articulator?

Answer 17

Position approximately canine to canine or 6 mm lateral

Question 18

What are the 4 steps to mounting casts?

Answer 18

1. Relate maxillary cast to the condylar axis (facebow)
2. Relate the mandibular cast to the maxillary cast in centric relation position (CR record)
3. VERIFY the accuracy of the mounting
   - 1st point of contact
   - Full arch occlusion record
4. Set the OVD in MIP (Incisal Guide Pin)

Question 19

What side of bite registration do you trim?

Answer 19

Mandibular Side Only!

Question 20

What percent of patients will not be accepted by Whip Mix Articulator?

Answer 20

20% due to Surtrusion of Retrusion

Question 21

What 2 numbers do you record on the sides of your diagnostic casts?

Answer 21

1. Record Angle of Eminence

2. Laterotrusion