Lecture 9

Question 1

What are the the 6 requirements of articulators that are mentioned in lecture?

Answer 1

1) Hold cast in correct horizontal and vertical position
2) Provide postive anterior vertical stop (Incisal guide pin)
3) Accept facebow transfer
4) allow mechanism to accept a third point of refrence from facebow transfer record.
5) Open and close hinge movement
6) Allow lateral and protrusive movement.

Question 2

What are the 5 other requirements mentioned on the second slide?

Answer 2

7) Adjustable horizontal and lateral guides (Some articulators)
8) Condylar elements as part of the lower frame and the condylar guides
9) support components should be of rigid construction
10) support components should be of rigid construction
11) components should move freely and be machined accurately
12) Instrument- to instrument cross calibration capability

Question 3

What are the limitation of articulators?

Answer 3

Mandibular movements are complex three dimensional space movements hand have the fourth dimension of timing.

• Simulate elementary mandibular movement but not duplicate them
• Instrument is only as good as the information programed and how well the operator understand the features.

Question 4

What is the weinberg classification?

Answer 4

• arbitrary
• postitional
• semiadjustable
• fully adjustable

Question 5

what are arbitrary articulators?

Answer 5

Monson articulator and hagman balancer

Question 6

Stansberry tripod is a form of what?

Answer 6

postional articulator

Question 7

What is a semi adjustable articulator?

Answer 7

Hanau modular articular

-Denar mark 320

Question 8

What is the arcon desgin in semi adjustable articulators?

Answer 8

• Arcon design means conlylar spheres are attached to the lower member.
• Mechanical fossae are attached to the upper member

Question 9

What is the non arcon design?

Answer 9

The opposite of the arcon.

• condylar sphere is the attached to upper
• mechnical fossae sphere attached to lower

Question 10

What is the difference between arcon and non arcon articulators?

Answer 10

Arcon artiulator: angulation of mechanical fossa is fixed relative to maximal occlusive plane

Question 11

Which one is considered anatomically correct Arcon or non Arcon?

Answer 11

Arcon

Question 12

What is a Denar MK V articulator?

Answer 12

Its a fully adjustable articulator

Question 13

What are the advantages of fully adjustable articulator?

Answer 13

Three demensional movement can be reproduced if simultanous pantographic tracings in three plane space

Question 14

What are the limitations of Semiadjustable articulator?

Answer 14

No laterotrusive mobement of the working side
-possible horizontal ridge and groove pathway

-no lateral movement of the rotating working side condile possible buccl cusp working side interfereence

• Also has a set intercondylar distance of 110 mm
• No immediate shift
• Distance from the condylar access effect arc of closure contacts