Diagnostic Casts and Articulator Mounting Flashcards
(42 cards)
___ ___ are accurate replica of the patient’s maxillary and mandibular arches.
Diagnostic casts
Accurate diagnostic casts transferred to a __-__ articulator are essential in planning fixed and removable prosthodontic procedures.
semi-adjustable
Use of a semi-adjustable articulator permits ___ and ___ relationships of the teeth without interferences from protective ___ reflexes (biting or gag reflex).
static; dynamic; neuromuscular
T/F. Diagnostic casts should contain no bubbles as a result of faulty pouring.
True.
T/F. Diagnostic casts should contain positive nodules on the occlusal surfaces.
False. They should contain NO positive nodules as these could prevent articulation and occlusal analysis.
what can occur if any of the alginate impression is unsupported by the tray during setting.
distortion of the impression
What is the importance of articulator mounting?
articulator is missing TMJ. It becomes the joint and replica of the patient’s skull. Therefore, you must relate the cast to the joint (articulator)
If the impression has bubbles it can leave ___ in the cast.
nodules
T/F. When removing the impression one should tease it off.
False. remove the impression with a vertical snapping motion. Teasing off may result in tearing of the thin areas of alignate and distort the impression.
The impression should be slight moist and not ___. Too much water will dilute the stone mix and form a chalky weak cast.
wet
When pouring the diagnostic cast, how can you avoid trapping air bubbles.
vibrate the stone into the impression then invert the impression and vibrate the stone back into the mixing bowl.
which type of articulator often leads to restorations with occlusal discrepancies, as they cannot reproduce the full range of mandibular movements?
small non-adjustable articulators
what is the only condition that can accurately be reproduced on a non-adjustable articulator?
ICP intercuspation
Which articulator is about the same size as the anatomic structures they represent and uses a face-bow transfer?
semi-adjustable articulator
what are the three adjustments found on the semiadjustable articulator?
- condylar inclination
- lateral translation movement (Bennett angle)
- intercondylar distance
The angle described by the inclinations of the protrusive and non-working condyle (viewed in a horizontal plane) is referred to as the ___ ___.
Bennett angle
What device is used in conjunction with fully adjustable articulators to adjust the condylar elements to follow the tracings obtained intraorally?
pantograph
The angle described by the inclinations of the protrusive and non-working side condylar paths as viewed in the sagittal plane is referred to as ___ ___.
Fisher angle
what is it called when the articulators have the condyles connected to the lower member?
arcon articulators
Those articulators with the condyles connected to their upper members are known as __-___ articulators.
non-arcon
What is the primary use of the ear (face)-bow transfer?
to mount the maxillary cast accurately on the articulator
adjust the intercondylar distance
T/F. The ear bow transfer is aligned perpendicular to the interpupillary line (horizontal reference).
False. It is aligned parallel.
Does the ear bow transfer allow the mandibular cast to be correctly mounted using a centric relation record?
yes.
The ear bow transfer orients the ___ cast (long axes of teeth) correctly in space using the ___ point of reference.
maxillary; third
