M+O 11 - articulators

Question 1

What are the 5 (/6) types of articulators?

Answer 1

• (the real thing)
• handheld study casts
• simple hinge articulator
• plane line articulator
• average value articulator
• semi-adjustable articulator - Denar Mark II

Question 2

What are the range of mandibular movements with tooth contact governed by?

Answer 2

• TMJ
• tooth guidance

Question 3

What are the 2 types of tooth guidance?

Answer 3

• protrusive - retrusive movements: incisal guidance and cuspal guidance
• lateral: canine guidance or group function

Question 4

When can/can’t handheld study casts be used?

Answer 4

• fine for simple study models..
  
  • if sufficient reference teeth
  • limited use if insufficient reference teeth

Question 5

What is the only function of single hinge articulators?

Answer 5

allows casts to be located to the recorded position

Question 6

What are the issues with simple hinge articulators?

Answer 6

• non-anatomical arbitrary hinge axis
• hinge movements that are not representative of condylar hinge movements

Question 7

What do plane line articulators allow?

Answer 7

allows casts to be located to the recorded position

Question 8

What use can plane line articulators have?

Answer 8

some use for simple restoration of teeth that are not involved in guidance of mandibular movements, simple removable prostheses

Question 9

What are the issues with plane line articulators?

Answer 9

• articulator hinge axis nearer condylar hinge axis but still an arbitrary position
• hinge movements therefore not representative of condylar hinge movements
• no excursive movements possible

Question 10

What do average value articulators allow?

Answer 10

allows casts to be located in the recorded position

Question 11

What can average value articulators have use for?

Answer 11

some use for simple restorations of teeth that are not involved in guidance of mandibular movements or removable prostheses

Question 12

What is the hinge of an average value articulator like?

Answer 12

• articulator hinge axis nearer condylar hinge axis but (without the use of a face bow) still an arbitrary position
• movements therefore not representative of condylar hinge movements
• average condylar guidance angles
• excursive movements possible within the limits of the above

Question 13

Where is the articulator hinge axis located on a semi-adjustable articulator - Denar Mark II?

Answer 13

articulator hinge axis located to (terminal) condylar hinge axis using a face bow recording (using EAM as a reference)

Question 14

What can be programmed into a semi-adjustable articulator?

Answer 14

condylar guidance angles/shifts with the aid of excursive occlusal recordings

Question 15

What can a semi-adjustable articulator have use for?

Answer 15

use for restoration of teeth that are involved in guidance, advanced restorative work e.g. bridges, implants and occlusal reorganisation

Question 16

What is an example of a non-arcon articulator?

Answer 16

average value articulator

Question 17

What is an example of an acron articulator?

Answer 17

Denar mark II articulator (semi-adjustable articulator)