Lab Station Exam Flashcards
1
Q
Alignate impression mixing time:
A
45-60 sec
2
Q
Time available from start of mixing time to final time at which impression can be seated without distortion:
A
Working time
3
Q
Time required for solution to gel reaction:
A
Setting time
4
Q
Setting time may also be called:
A
Gelation
5
Q
Setting time for alginate impression:
A
3-4 minutes
6
Q
What should the thickness of uniform distribution of an alginate impression material be:
A
2-6mm
7
Q
Describe how to remove an impression from patients mouth:
A
Sharp snapping action after breaking border seal, do not twist or rock
8
Q
Criteria for accurate casts:
- Free of _____/____
- Surface should be ___, ___ & 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 & in _____; otherwise remake
- Should appear ___ & free from any ___ & ____
A
- voids/nodules
- hard, dense; grinding sludge
- required areas
- 10-15mm thick
- Flat
- articulation
- 2-3mm; periphery of vestibule
- vertical
- MIP
- clean; debris or sludge
9
Q
Label A-D:
A
a) Facebow
b) Index/levels
c) Transfer assembly
d) Orbital pointer
10
Q
The type of facebow used in lab:
A
Arbitrary type: Denar slidematic facebow
11
Q
What is the purpose of a facebow:
A
Record spatial relationship of maxillary arch to anatomic reference points
12
Q
How do we determine the third point of reference?
A
43mm from maxillary incisor incisal edge
13
Q
The third point of reference should be:
A
Repeatable & reproducible
14
Q
Label A-E:
A
a) upper member
b) lower member
c) anterior/incisal pin
d) mounting ring
e) condylar mechanism
15
Q
What type of articulator is an Arcon?
A
Semi-adjustable
16
Q
Describe an Arcon Semi-adjustable articulator:
A
Condyles in lower member & condylar inclination in upper member
17
Q
The purpose of an articulator is:
A
A mechanical device that simulates mandibular movements of condyles in their fossa
18
Q
When articulating the lower cast, adjust the incisal guide pin to ____ & use:
A
0 degrees; 2-step mounting technique
19
Q
Tooth dependent position which is independent of condylar position:
A
Maximum intercuspation
20
Q
Describe MI:
A
Maximum intercuspation- tooth dependent position independent of condylar position
21
Q
TMJ dependent position which is independent of tooth position:
A
Centric relation
22
Q
Describe CR:
A
Centric relation- Condyles in most anterior-superior position, independent of tooth position
23
Q
Important for deprogramming muscles of mastication to achieve and successfully record CR:
A
Anterior Deprogrammer
24
Q
Anterior deprogrammer is important for ____ to achieve & successfully record _____
A
Deprogramming muscles of mastication; CR
25
What is this device & describe its function:
Anterior deprogrammer: important for deprogramming muscles of mastication & to achieve & record CR
26
What is this device & describe its function:
Leaf Gauge- finds the first point of contact in CR
27
A leaf gauge finds the _____ in _____
First point of contact; CR
28
Label A-E:
a) functional cusp bevel
b) retention groove
c) axial reduction
d) chamfer margin
e) morphologic occlusion reduction
29
On a #19 full gold crown prep reduction:
a) Functional cusp bevel:
b) Retention groove:
c) Axial-depth reduction
d) Chamfer margin
e) Functional cusp:
f) Central foss
g) Non-functional cusps
a) 1.5 and tapers to 1.0mm
b) full depth of 170L bur
c) 0.5 to 1.0mm
d) 0.5mm
e) 1.5mm
f) 1.5mm
g) 1.0mm
30
The morphologic occlusal reduction includes the reduction of:
Functional cusps, central fossa & non-functional cusps
31
On a #19 full gold crown prep what is reduced further, the functional or non-functional cusp?
Functional cusp
32
What is used for the preliminary crown impression?
Reduction index (Putty matrix)
33
What is the purpose of the reduction index made from putty matrix?
Evaluate occlusal reduction
34
#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) 1.5-2.0 mm
b) 1.5 mm
c) 6-10 degrees
d) 1.0 mm
e) rounded
f) greater than 3 mm
35
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
36
A cerec crown can be made of:
1. Zirconium
2. Glass ceramic
3. Ceramo-metal
37
A Cerec crown compared to a full gold crown requires:
More rounded & reduction of prep is needed
38
What are the steps to Cerec crown preparation:
1. Scan
2. Mill
3. Stain
4. Glaze
5. Fire
39
The first step in making a custom anterior guide table:
Mix monomer (liquid) and Duralay- Methyl Methacrylate Resin (powder)
40
When making a custom anterior guide table, what is the liquid? What is the powder?
Liquid= monomer
Powder= Duralay (methyl methacrylate resin)
41
When making a custom anterior guide table, the casts will be in:
MIP
42
When making a custom anterior guide table, the upper member of articulator should:
Open/close WITHOUT interferences
43
When making a custom anterior guide table, there should be a _____ of the incisal pin as it _____
There should be a clear undisrupted view of the incisal pin as it contacts the custom table
44
When making a custom anterior guide table, the pin should be contacting the table during:
Excursive movements
45
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 throughout the movement as well
46
When we waxed crowns #6 & #8, we set the stone casts to ______ & evaluated _____ & _____
MIP; Right lateral excursive & protrusive
47
When we waxed crowns #28, #29 & #30, we used _____ to check for interocclusal contact
Delar powdered wax
48
When we waxed crowns #28, #29 & #30 the Delar powdered wax was used to check:
Interocclusal contacts
49
When we waxed crowns #28, #29 & #30, the stone casts were set to _____
MIP
50
In posterior teeth:
Functional cusp=
Nonfunctional cusp=
Functional cusp= buccal
Nonfunctional cusp= lingual
51
When we waxed crowns #28, #29 & #30 we evaluated what movements?
Excursive & Protrusive
52
When we waxed crowns #28, #29 & #30
The ML cusp of the maxillary first molar should contact:
Central fossa of #30
53
When we waxed crowns #28, #29 & #30
The _____ of _____ should contact the central fossa of #30
ML cusp of the maxillary first molar
54
One cusp occluding in three different areas of opposing tooth:
Tripodization
55
When we waxed crowns #28, #29 & #30
The distal cusp tip of #30 should contact:
Distal fossa of maxillary first molar (only cusp that does not occlude with the opposing fossa)
56
Shim stock is used to evaluate:
Occlusal contacts
57
Used to evaluate where occlusal adjustments need to be made:
Articulating paper
58
Describe ideal contacts of posterior teeth:
Posterior teeth should have multiple, even, B/L &b simultaneous occlusal contacts
59
Describe ideal contacts of anterior teeth:
Anterior teeth should have lighter occlusal contacts when posterior teeth are in MIP
60
Why should anterior teeth have lighter occlusal contacts when teeth are in MIP:
Because anterior teeth are not axially loaded
61
In MIP the desired outcome=
Centric stops
62
Describe the desired outcome of MIP (centric stops) (3):
-Atleast three maxillary & three mandibular teeth in each quadrant are contacting
-Most of the anterior teeth are contacting
-Anterior teeth exhibit lighter contacts than posterior teeth
63
It is recommended to adjust _____ vs. _____
Adjust the enamel layer of maxillary lingual fossa vs. adjusting the incisal edges
64
Why is it recommended to adjust the enamel layer of maxillary lingual fossa vs. incisal edges when possible:
To avoid altering esthetics
65
Describe working side interference during lateral excursive movements:
Inner inclines of maxillary buccal cusps & outer inclines of mandibular buccal cusps
66
Describe non-working or balancing interference during lateral excursive movements:
Inner includes of maxillary lingual cusps & inner inclines of mandibular buccal cusps
67
Working side interferences or non-working or balancing interferences occur during:
Lateral excursive movements
68
Interferences during protrusive movements:
Anterior guidance should be present during ____
Excursive movements
69
During excursive movements, anterior teeth should:
Disclude the posterior teeth during excursive movements
70
Maxillary arch working cusps:
Lingual cusp (6)
71
Maxillary arch non-working cusps:
Buccal cusp (6)
72
Mandibular arch working cusps:
Buccal cusp (7)
73
Mandibular arch non-working cusps:
Lingual cusp (6)
74
How many centric occlusal contacts should be present per side in the maxillary arch:
6 per side
75
(Maxillary Arch) Describe protrusive pathway:
From centric occlusion contact --> mesial
76
(Maxillary Arch) Describe working pathway:
From centric occlusion contact --> mesial/buccal
77
(Maxillary Arch) What side is the working side during a right lateral shift:
Right side
78
(Maxillary Arch) What side is the working side during a left lateral shift:
Left side
79
(Maxillary Arch) Describe the non-working pathway:
From centric occlusion --> lingual
80
(Maxillary Arch) What side is the non-working side during a right lateral shift:
Left side
81
(Maxillary Arch) What side is the non-working side during a left lateral shift:
Right side
82
In the mandibular arch, how many centric occlusion contacts are present per side?
5 per side
83
In the mandibular arch, describe protrusive pathway:
From centric occlusion contact --> distal
84
In the mandibular arch, describe working pathway:
Fron centric occlusion contact --> lingual
85
In the mandibular arch, what side is the working side during a right lateral shift?
Right
86
In the mandibular arch, what side is the working side during a left lateral shift?
Left
87
In the mandibular arch, describe the non-working pathway:
From centric occlusion contact --> distal/buccal
88
In the mandibular arch, what side is the non-working side during a right lateral shift?
Left
89
In the mandibular arch, what side is the non-working side during a left lateral shift?
Right
90
What is the purpose of an occlusal guard?
Improve muscular pain condition & protect teeth & support structures
91
How does an occlusal guard improve muscular pain conditions?
By altering sensory input to CNS
92
What does an occlusal guard protect teeth/supportive structures from?
Abnormal occlusal forces
93
A stabilization appliance is usually for:
Maxillary arch
94
The purpose of a stabilization appliance is to:
Eliminate orthopedic instability between occlusal position & joint position
Treat muscle pain disorders
95
In a stabilization appliance, the condyles will be:
In most stable musculoskeletal position the same time as teeth are contacting evenly/simultaneously
