Station Exam Pt. II Flashcards
What are the uses of an articulator:
- Diagnosis
- Treatment planning
- Communicate with patients/patient education
- fabrication of prostheses/restorations
What are characteristics of semi-adjustable articulators?
- Used the most
- Allow for opening/closing
- Allow excursive (lateral) & protrusive movements
What are the characteristics of a non-adjustable or “hinge: articulator?
- Allow only opening/closing movements
- Can be used for single posterior restorations
- Their use can change the closure angle and by doing so the final restoration will present premature contacts
Describe an Arcon semi-adjustable articulator:
- Condyles in lower member
- Condylar indication in upper member
When the condylar indication is in the ______ member, this more closely resembles what is in the patients mouth
Upper member
Describe a Non-Arcon articulator:
- mainly used for removable prosthodontics
- Condyles in upper member
- Condylar inclination in the lower member
What type of articulator do we use?
Arcon (Semi-adjustable)
What is the purpose of a facebow?
To orient the maxillary cast to the rotational axis in three planes
Using a facebow will result in _____ articulation of subsequent _____ casts
Reproducible; maxillary
The facebow orients the dental cast in the same relationship to the ______of the aritculator
opening axis
What are usually the anatomic references?
- Mandibular condyles
- Transverse horizontal axis
- One other selected anterior point
What does an ear-bow index to & what does it register?
The external auditory meatus; Registers the relation of the maxillary arch to a horizontal reference plane
What is the third point of reference?
The anterior reference point- it should be repeatable & reproducible; it is parallel to the upper and lower arms of the articulator
The facebow orients the maxillary cast to a:
Reference plane
The reference plane requires 3 points including:
2 on each side of the face and one on the anterior face
When should you use a facebow?
- When cusp teeth are present
- Interocclusal records are made at an increased OVD
- When the OVD is subject to change
- Alteration in occlusal surfaces are necessary
Where does the mandible articulate with the skull?
At the temporal bone
How many bones make up the maxilla and where do they fuse?
Two; fuse at the mid-palatal suture
What is the superior border of the maxilla
The floor of the nasal cavity & orbit
What is the inferior border of the maxilla?
The palate & the alveolar ridge
What are the components of the maxilla?
Body & processes (zygomatic, frontal, alveolar, palatine)
T/F: The mandible is the largest and strongest bone in the skull
True
What are the components of the mandible?
Body (horizontal part)
Ramus (Vertical part)
What is the superior aspect of the mandible:
Alveolar crest & teeth