Station Exam Flashcards
alginate impression mixing time:
45-60 seconds
Time available from start of mix to final time at which impression can be seated without distortion:
working time
Time required for solution to gel reaction:
setting time
Setting time may also be called:
gelation
Setting time for alginate impressions:
3-4 minutes
What should the thickness of uniform distribution of an alginate impression be?
2-6mm
Describe how to remove an impression from patients mouth:
sharp snapping action after breaking border seal. Do not twist or rock
Criteria for accurate casts:
- free of ___/___.
- surface should be ___, ___ and free from ___
- should extend to all __.
- Base should be ___ thick at thinnest place
- Base should be ___
- Base should not interfere with ___
- Casts should have a horizontal land area of ___ at the ___
- Side walls of the base should be trimmed ___
- Should be accurate and in ___; otherwise remake
- Should appear ___ and free from any ___ or ___.
- voids/nodules
- hard, dense; grinding sludge
- required areas
- 10-15mm thick
- flat
- articulation
- 2-3mm; periphery of vestibule
- vertical
- MIP
- clean; debris or sludge
Label A-D:
A: Face bow
B: Index/level
C: Transfer assembly
D: Orbital pointer
The type of facebow that we used in lab:
Denar Slidematic Facebow- arbitrary type
What is the purpose of a facebow?
record spatial relationship of maxillary arch to some anatomic reference point(s)
How do we determine the 3rd point of reference?
43mm from maxillary incisor incisal edge
The 3rd point of reference should be:
repeatable and reproducible
Label A-E:
A: Upper member
B: Lower member
C: Anterior/incisal pin
D: Mounting ring
E: Condylar mechanism
What type of articulator is an Arcon?
Semi-adjustable
Describe an Arcon semi-adjustable articulator:
condyles in lower member and condylar inclination in upper member
The purpose of an articulator is:
a mechanical device that simulates mandibular movements of condyles in their fossa
When articulating the lower cast, adjust the incisal guid pin to ____ and use:
0 degrees; 2-step mounting techique
Tooth-dependent position which is independent of condylar position:
maximum intercuspation (MI)
Describe MI:
maximum intercuspation: tooth dependent position, independent of condylar position
TMJ dependent position which is independent of tooth position:
Centric relation
Describe CR:
Condyles in most anterior-superior position, independent of tooth position
Important for deprogramming muscle of mastication to achieve and successfully record CR:
Anterior deprogrammer
Anterior deprogrammer is important for ____ to achieve and successfully record ___.
deprogramming muscles of mastication; CR
What is this device and describe the function:
anterior deprogrammer; important for deprogramming muscles of mastication and to achieve and successfully record CR
What is this device and what is the purpose?
Leaf gauge; finds the first point of contact in CR
A leafe gauge finds the ____ in ____.
first point of contact in CR
Label A-E
A: Functional cusp bevel
B: Retention groove
C: Axial reduction
D: Chamfer margin
E: Morphologic occlusion reduction
On a #19 full gold crown prep: (reductions)
A: functional cusp bevel:
B: Retention groove:
C: Axial reduction:
D: Chamfer margin:
E: Functional cusp
F: Central fossa:
G: Non-functional cusp:
A: 1.5 and tapers to 1.0mm
B: full depth of 170L bur
C: 0.5-1.0mm
D: 0.5mm
E: 1.5mm
F: 1.5mm
G: 1.0mm
The morphologic occlusion reduction includes the reduction of:
functional cusp, central fossa, and non-functional cusp
In a #19 full gold crown prep, what is reduced more, the functional or non-functional cusp?
functional cusp
What is used for the preliminary crown impression?
reduction index (putty matrix)
What is the purpose of the reduction index made from putty matrix?
to evaluation occlusal reduction
29 All ceramic crown preparation guidelines:
A: Occlusal reduction:
B: Axial reduction:
C: Occlusal convergence:
D: Cervical finish line:
E: ____ line angles
F: Occlusocervical length:
A: 1.5-2.0mm
B: 1.5mm
C: 6-10 degrees
D: 1.0mm
E: rounded
F: greater than 3mm
Posterior crown reduction criteria:
____mm margin
____mm axial
____mm occlusal
____ internal/external line angles
_____ shoulder margin design or ____
1.0-1.2mm margin
1.5mm axial
1.5-2.0mm occlusal
rounded internal/external line angles
modified shoulder margin design or heavy chamfer
A CEREC crown can be made of:
- zirconium
- glass ceramic
- ceramo-metal
A CEREC crown compared to a full gold crown requires:
More rounded and reduction of prep is needed
What are the steps to CEREC crown preparation?
- scan
- mill
- stain
- glaze
- fire
The first step in making a custom anterior guide table:
mix monomer (liquid) and duralay-methyl methacrylate resin (powder)
When making a custom anterior guide table, what is the liquid, what is the powder?
Liqiud= monomer
powder= duralay (methyl methacrylate resin)
When making a custom anterior guide table, the casts will be in:
MIP
When making a custom anterior guide table, the upper member of articulator should:
open/close WITHOUT interference
When making a custom anterior guide table, there should be a _____ of the incisal pin as it ____.
there should be a clear undisputed view of the incisal pin as it contacts the custom table
When making a custom anterior guide table:
The pin SHOULD be contacting the table during:
exursive movements
When making a custom anterior guide table:
The pin SHOULD be contacting the table throughout excursive movements and the anterior teeth:
should be in contact the movement as well
When we waxed up crowns #6 and #8, we set the stone casts to ____ and evaluated ___ and ____.
MIP; right lateral excursive & protrusive
When we waxed crowns #28, #29, and #30, we used ____ to check for interoccclusal contacts:
Delar Powdered Wax
When we waxed crowns #28, #29, and #30, the Delar powdered was was used to check:
interocclusal contacts
When we waxed crowns #28, #29, and #30, the stone casts were set to ___.
MIP
In mandibular posterior teeth, the functional cusp is the ____, and the non-functional cusp is the ____
functional cusp= buccal
non-functional cusp= lingual
When we waxed crowns #28, #29, and #30, we evaluated what movements?
excursive and protrusive
When we waxed crowns #28, #29, and #30, the ML cusp of the maxillary 1st molar should contact:
central fossa of #30
When we waxed crowns #28, #29, and #30, the _____ of ____ should contact the central fossa of #30
ML cusp of maxillary 1st molar
One cusp occluding in three different areas of opposing tooth:
tripodization
When we waxed crowns #28, #29, and #30, the distal cusp tip of #30 should contact:
distal fossa of maxillary 1st molar (only cusp that doesn’t to occlude with the opposing fossa)
Shim Stock is used to evaluate:
occlusal contacts
Used to evaluate occlusal contacts:
Used to evaluate where occlusal adjustments need to be made:
shim stock
articulating paper
Describe ideal contacts of posterior teeth:
posterior teeth should have multiple, even, bilateral and simultaneous occlusal contacts
describe ideal contacts of anterior teeth:
anterior teeth should have lighter occlusal contacts hen posterior teeth are in MIP
Why should anterior teeth have lighter occlusal contacts when posterior teeth are in MIP?
anterior teeth are not axially loaded
In MIP, desired outcome =
centric stops
In MIP, describe desired outcome (centric stops) (3):
A. at least 3 maxillary and 3 mandibular posterior teeth in each quadrant are contacting
B. Most of the anterior teeth are contacting
C. Anterior teeth exhibit lighter contacts that posterior teeth
Its recommended to adjust ____ versus _____.
adjust the enamel layer of maxillary lingual fossae vs. incisal edges
Why is it recommended to adjust the enamel layer of maxillary lingual fossa vs. mandibular incisal edges whenever possible?
to avoid altering esthetics
Describe working side interference during lateral excursive movements:
Inner inclines maxillary buccal cusps & outer inclines of mandibular buccal cusps
Describe non-working or balance interference during lateral excursive movements:
Inner inclines of maxillary cusps and inner inclines of mandibular buccal cusps
Working side interference and non-working or balancing interference occur during:
lateral excursive movements
Interference during protrusive movements:
Anterior guidance should be present during ___
excursive movements
During excursive movements, anterior teeth should:
anterior teeth should disclude the posterior teeth during excursive movements
maxillary arch working cusps:
lingual cusps (6)
maxillary arch non-working cusps:
buccal cusps (6)
mandibular arch working cusps:
buccal cusps (7)
mandibular arch non-working cusps:
lingual cusps (6)
How many centric occlusion contacts should we have on each side in the maxillary arch
6
MAX: Describe protrusive pathway:
from centric occlusion contact –> mesial
MAX: Describe working pathway:
from centric occlusion contact —> mesial-buccal
MAX: What side is the working side during a right lateral shift?
right side
MAX: What side is the working side during a eft lateral shift?
left side
MAX: Describe non-working pathway:
from centric occlusion —> lingual
MAX: What side is the non-working side during a right lateral shift?
left side
MAX: What side is the non-working side during a left lateral shift?
right side
In the mandibular arch, how many centric occlusion contacts are present on each side?
5
In the mandibular arch, describe protrusive pathway:
from centric occlusion contact toward distal
In the mandibular arch, describe working pathway:
from centric occlusion contact –> lingual
In the mandibular arch, what side is the working side during a right lateral shift?
right side
In the mandibular arch, what side is the working side during a left lateral shift?
left side
In the mandibular arch, describe non working pathway:
from centric occlusion contact —> out distal bucccal
In the mandibular arch, what side is the non-working side during a right lateral shift?
left side
In the mandibular arch, what side is the non-working side during a left lateral shift?
right side
What is the purpose of an occlusal guard?
improve muscular pain conditions & protect teeth and supportive structures
How does an occlusal guard improve muscular pain conditions?
by altering sensory input to CNS
What does an occlusal guard protect teeth/supportive structures from?
abnormal occlusal forces
A stabilization appliance is usually for:
maxillary arch
the purpose of a stabilization appliance is to:
eliminate orthopedic instability between occlusal position and the joint position as well as treat muscle pain disorders
In a stabilization appliance, the condyles will be:
in most stable musculoskeletal position the same time as teeth are contacting evently/simultaneously
