20. Occlusal Examination

Question 1

Challenges of occlusion in the lab

Answer 1

• working imp
• opposing impression taken
• occlusal record
• handling of casts
• mounting of casts

Question 2

For occlusal analysis, trial occlusal adjustment, diagnostic waxing, which articulator would you choose?
Records taken?

Answer 2

• average value or semi-adjustable
• facebow, CR or ICP record as appropriate

Question 3

For single posterior restoration, which articulator would you choose?
Records taken?

Answer 3

• hand-held casts, small crown and bridge
• ICP record

Question 4

For multiple posterior restorations (group function), which articulator would you choose?
Records taken?

Answer 4

• semi-adjustable
• facebow, ICP record, optimal lateral check record (if group function being waxed for whole sextant)

Question 5

For multiple posterior restorations (posterior disclusion), which articulator would you choose?
Records taken?

Answer 5

• average value
• facebow, ICP record

Question 6

For single upper anterior restoration, which articulator would you choose?
Records taken?

Answer 6

• hand-help casts (if guidance can be developed from adjacent teeth) or average value
• ICP record, pretreatment casts if guidance cannot be developed from adjacent teeth

Question 7

For multiple upper anterior restorations, which articulator would you choose?
Records taken?

Answer 7

• average value or semi-adjustable
• facebow, ICP record, pretreatment casts (to copy guidance), impression of provisional restorations resulting from diagnostic wax-up

Question 8

Semi-adjustable articulators use what principle?

Answer 8

ARCON
- articulating condyle

Question 9

Structure and role of semi-adjustable articulator

Answer 9

• mimics natural TMJ
• non-arcon is the reverse
• condylar guidance (glenoid fossa) attached to upper membrane
• condyle attached to lower member

Question 10

On semi-adjustable articulators, intercondylar width is set at …, condylar guidance is … with … progressive side shift

Answer 10

• 110 mm
• 25 degrees
• 7 degrees

Question 11

Movement of condyles on the NWS

Answer 11

• moves forwards, downwards, medially
• Bennet angle
• condylar angle

Question 12

Movement of condyles on WS

Answer 12

• immediate side shift
• or Bennet movement

Question 13

What does FDM mean?

Answer 13

• forwards, downwards, medially