Getting Acquainted with the Articulators Flashcards
What is an articulator?
A mechnaical device for mounting casts of a patient’s dental arches so that various dental procedures and tasks can be carried without the presence of the patient.
What is a class I articulator?
A simple holding instrument capable of accepting a single static registration; vertical motion is possible.
What type of articulator is a class I articulator?
Non-adjustable. The simplest type and the most limited in dentistry.
What position does the class I articulator reproduce?
One specific occlusal contact position which is usually the maximum intercuspal position.
What kind of motion does the class II articulator do?
It can move horizontal and vertical motion but does not orient the motion of the TMJ.
What type of articulator is the class II articulator?
Non-adjustable articulator.
What are class II articulators most often used for?
A restoration of a single crown because of its low cost and ease.
What is the largest disadvantage to using a non-adjustable articulator?
The increase in time in adjusting the restoration intraorally because of its inaccurate eccentric movement.
What is the result of inaccurate eccentric movement?
Poor anatomic form and occlusal relationships of final restorations.
What is a class III articulator?
An instrument that simulates condylar pathways by using averages or mechanical equivalents for all or part of the motion.
What type of articulator is a class III articulator?
A semi-adjustable. Can be arcon or non-arcon.
What type of articulator do we use for class?
A semi-adjustable arcon Denar 330 class III articulator.
What does it mean to be an arcon articulator?
It has condylar elements on the lower member and condylar guidance on the upper member.
What are some common adjustments found on semi-adjustable articulators?
1) Condylar inclination
2) Lateral translational movement (Bennet angle and immediate side shift)
3) Condylar distance
What adjustments does our Denar 330 have?
1) Condylar inclination
2) Lateral translational movement
What condylar distance is our Denar 330 fixed to that cannot be adjusted?
110mm.
What is a class IV articulator?
An instrument that will accept three-dimensional dynamic registration and allow for orientation of the casts to simulate the TMJ and mandibular movements.
What type of articulator is a class IV articulator?
Fully adjustable articulator.
How many possible adjustments can a fully adjustable articulator perform?
14
What can the articulator do if the centric lock is closed?
The articulator only has hinge like open and closing movements.
What can the articulator do if the centric lock is open?
The articulator has lateral and forward movements.
What does the condylar housing represent?
The fossa of the TMJ.
What does the condylar inclination represent?
The shape and steepness of the articular eminence.
What is another name for condylar inclination?
Horizontal condylar inclination.
