Dental articulators

Question 1

Class 1

HINGE

Answer 1

Cast holder that cannot replicate movement of the mandible

It is less accurate as only vertical movement is recorded

Question 2

Class II

Average value

Answer 2

Horizontal and vertical motion can be attained based on mean values

Question 3

Class III

Semi-adjustable

Answer 3

Condylar angles can be adjusted

Facebow can be used to mount the cast and more adjustments can be incorporated

Question 4

Class IV

Fully adjustable

Answer 4

Fully adjustable, more accurate (Facebow) planes and fossas can be mimiced

Question 5

Articulator def.

Answer 5

Mechanical device that represents the temporo-mandibular joints and the jaw members to which maxillary and mandibular casts may be attached to stimulate some or all the mandibular movements

Question 6

Classification of Facebow

Answer 6

1. Arbitrary
   Fascia-Nasal relator
   Ear Piece-orbital indicator
2. Kinematic

Question 7

Arbitrary facebow

Answer 7

Used in complete denture construction

Question 8

FASCIA TYPE

Answer 8

The fascia type of face bow utilizes approximate points on the skin over the TMJ as the posterior reference points

The center of condyle is arbitrarily located on the side of the face 11-13 mm anterior to the tragus on a line connecting the superior border of the tragus and the outer canthus of eye

Question 9

EAR PIECE TYPE

Answer 9

These facebow uses the external auditory meatus as an arbitrary reference point which is aligned with ear pieces similar to those on a stethoscope

It has an advantage that it is simple to use, does not require measurements on face

Ear piece facebow is further classified as
* Spring bow type
* Whip mix face bow