Quiz 2 Flashcards
A dental articulator is a mechanical instrument used to do what?
- Orient the relative relationship of the Maxillary and Mandibular casts of a patient to: A) each other B) to the posterior determinants of occlusion
- Duplicate the functional and border movements of the mandible
(not coronoid process)
What are the characteristics of Nonadjustable Articulators?
- No adjustments are possible
- Allows for eccentric movements within limitations of instrument
- Cannot duplicate a patient’s specific movements
- “Barn Door Hinge”
- Close occlusal contact position only one that is reproducible (MI or ICP)
NO CR recordings**
What are the Advantages and Disadvantages of the Semi-adjustable Articulator?
Advantages:
- Better than non-adjustable in replicating the patient’s specific condylar movement
- Excellent for routine dental treatments
Disadvantages:
- More time consuming to be effective, info must be transferred from patient to articulator
- More expensive than non-adjustable
What are the characteristics of Occlusal Prematurities? (5 points)
- “High” contact, before patient closes all the way into Max Intercuspation
- First tooth contact in Centric Relation is the best example of an occlusal prematurity
- Prematurity = Contact on an incline or an area that is not considered stable
- None of these contacts are proper Max Intercuspation occlusal contacts
- Mandible can be displaced anteriorly and or laterally
What kind of interference can be found on the triangular ridge of the Distal Lingual cusp of the Mandibular 1st molar?
Working Interference
- What muscles contract during mandibular closure close to Max Intercuspation?
- Which muscles will relax?
- Posterior and Middle Temporalis
- Inferior and Superior belly of the Lateral Pterygoids
CLICKS!!!
- What occurs at initiation of the translation of the condyles?
- What occurs just prior to termination of opening in patients with anteriorly displaced disks?
- What is it called when a portion of the articular disc that is displaced to the anterior?
- What is generic displacement of the articular disc at rest, which resolves upon mandibular opening?
- What is generic displacement of the articular disc at rest, which does not resolve upon mandibular opening?
- Early Opening Click
- Late Openin Click
- Deviation in Form
- Partial Disc Displacement
- Disc Displacement with Reduction
- Disc Displacement without Reduction
Procedures utilizing a non-adjustable articulator.
- What are used to locate and fix casts?
- Where are the casts located?
- How are the teeth positioned when the casts are held together?
- What will result, when any bite registration material that allows the teeth to separate?
- Arbitrary mounting procedures
- Equidistant between the Maxillary and Mandibular components of the articulator
- In Maximum Intercuspation
- An inaccurate replication of the intercuspal position (ICP) – no use of material
Bennet Angle Pathway
In the skull, the pathway the condyle descends during protrusive and laterotrusive movements is generally __________. Semiadjustable articulators are limited to providing only a ______________?
- Curved
- Straight Pathway
What are the 3 procedures that are necessary to use the Fully adjustable articulator properly and effectively?
- An exact hinge axis location of the condyles for the facebow
- A pantographic recording
- A CR occlusal record
** never use a MI record **
When selecting an articulator, what are the 2 factors that determine mandibular movement within the patient?
When a patient has _________ & __________ anterior guidance, these tooth contacts dominate and control _______________.
- Posterior Controlling Factors (TMJ’s)
- Anterior Controlling Factors (anterior teeth)
- Adequate
- Immediate
- Mandibular Movement
What are the goals of learning and understanding the “Prematurities”?
- Understand the location of occlusal prematurities during normal closure
- Locations of working side, non-working side and protrusive premature occlusal contacts.
- The condylar positions as a result of either working or non-working premature occlusal contacts
- Identify muscles of mastication that are affected by working, non-working and protrusive premature occlusal contacts
- Know which side the mandible deviates or moves toward with working, non-working or protrusive occlusal prematurities present
If a patient presents with a occlusal prematurity on the triangular ridge of the Facial Cusp of the Mandibular 2nd Premolar what is this classified as?
Non-working Interference
If a patient has an occlusal prematurity on the mesial marginal ridge of the maxillary 1st premolar, what is this classified as?
Protrusive Interference
What happens when a patient has a triangular ridge of the Mesio Facial cusp of the Maxillary 1st Molar in contact with the Facial ridge of the Mesio Facial Cusp of the Mandibular 1st Molar?
Premature “A” contact = Mandibular devation to OPPOSITE side
