Practice tests Flashcards
1
Q
what was wrong with the prep shown on the interproximal surfaces?
A
Overconverged
2
Q
what was wrong with the prep shown on the facial surface?
A
Cervical not 1.2 and incisal not 1.5-1.7
3
Q
short walls cause loss of resistance. To fix this …..
A
you add restorative material or grooves
4
Q
what was wrong with the prep shown?
A
Part had supragingival margin and part had subgingival
5
Q
t/f: axial depth of chamfer should not be wider than half of the depth of the bur used:
A
true
6
Q
t/f: rampent caries that can’t get under control, don’t do fixed prosethetics until they have it under control
A
true
7
Q
path of insertion should be parallel to the long axis, parallel to proximal contacts,
A
all of the above
8
Q
t/f: preparing without appropriate contact causes drifting, issues with final restoration, inflammation
A
true
9
Q
t/f: preparation in hypo-occlusion: no problem; interim in hypo-occlusion, final will be in hyper
A
true
10
Q
use bis-acryl for (indirect or direct)
A
indirect
11
Q
t/f: PMMA is most exothermic and most shrinkage
A
true
12
Q
t/f: axial reduction 1.5-2
A
false
13
Q
toxicity and low physical strength with ____ ____
A
free monomer
14
Q
t/f: eugenol is termination
A
true
15
Q
t/f: OC:FL ratio is 0.25
A
false
16
Q
t/f: OC:FL ratio is 0.25
A
false
you want 0.4
17
Q
t/f: reduction on occlusal for porcelain should be 1 mm
A
false
18
Q
t/f: seating groove helps with stop rotation, parallel to long axis and something else
A
true
19
Q
t/f: round line angle is most important for all ceramic
A
true
20
Q
t/f: grooves should be 90 degrees to disposing forces
A
true
21
Q
t/f: forces coming in FL put grooves in MD
A
true
22
Q
MC with porcelain collar: what finish line do you do?
A
shoulder for strength
23
Q
t/f: adequate axial reduction use 2 plane
A
true
24
Q
t/f: if patient is in pain do further examination
A
true
25
articulator to facebow approximates_____ contacts in mandibular movement
posterior
26
The purpose of a face-bow transfer to a semi-adjustable articulator is to?
The close approximation of posterior determinants for mandibular movement
27
Occlusal disturbances are evaluated? ********
Intraoral exams
but also articulated diagnostic casts right?
28
the Right, tipping forces are due to
resistance
29
The treatment plan for a patient with rampant caries and plaque accumulation is
A. To place pin-retained amalgam restorations until the caries/plaque is under control
B. Not doing prosthodontic treatment until the caries/plaque is under control
C. Motivate the patient to control their oral health and have good oral hygiene
D. All of the above are true
All of the above
30
If you reduce the facial surface in a one-plane method of metal-ceramic and all-ceramic crowns, this can cause: *********
Possibility to pulp exposure
31
If you reduce the facial surface in a one-plane method of metal-ceramic and all-ceramic crowns, this can cause: *********
Possibility to pulp exposure
32
Overcontouring of which regions will cause displacement in the facial direction?
Lingual just above the cingulum
33
The facial shoulder on a metal-ceramic crown should
Extend lingual to the interproximal contact
34
The wall of an anterior tooth preparation should be 2 mm when the TOC is between 10-12 degrees. The occlusal-cervical : facial-lingual ratio should be 0.4 or higher on all teeth
1st statement is false, second statement is true
35
The seating groove
Prevents rotational movement
Limits the path of insertion to 1 direction
All of the above are true
All of the above!
36
The path of insertion should be
a- Parallel to the long axis of the tooth
b- Parallel to the proximal contact points to allow seating
c- Determined at the end of the preparatation
d- A and B are true
A and B are true
a- Parallel to the long axis of the tooth
b- Parallel to the proximal contact points to allow seating
37
Which of the following methods are not used to evaluate the occlusal convergence
a- Binocular vision through the mirror
b- Viewing the prep with one eye
c- Visualizing the mesial/distal convergence form the facial/lingual view
d- Visualizing the facial/lingual convergence from the anterior/posterior view
Binocular vision through the mirror
38
In a FGC, the nonfunctional cusp should be ____ mm and the functional cusp should be _____ mm
1.0, 1.5
39
The chamfer depth on a metal-ceramic crown should be
0.3-0.5 mm
40
When a patient exhibits pain or dysfunction
Further examine the patient to alleviate pain before you begin treatments
41
With a metal-ceramic crown, which of the following is true concerning the finish line on the facial surface
A shoulder allows an increase in strength, unlike the chamfer
42
With all-metal ceramic crown, why is a chamfer used
Better able to detect with impressions/dies
Uses an acute angle for good closure of the margins and a closer fit
Ease of placement
43
Margins on cast restorations should be placed
On enamel supragingivally
44
Identify Chamfer, Knife edge, beveled shoulder, and radial shoulder
good for u
45
Open proximal contacts of a temporary restoration can cause
Excessive adjustment of the permanent restoration
Tooth Migration
46
It is desirable to convert all of the free monomer into polymer because
Unreacted monomer is toxic
| Better mechanical properties
47
Eugenol will cause
Termination
48
Which of the following is the best for direct technique and over-matrix method
Bis-acryl resin
49
When using PMMA, a reason that you would want to choose the indirect over direct technique is
Protection of the tissues and pulp from heat/chemicals
50
Metal ceramic restorations are indicated in all of the following except
a- Extensive tooth destruction
b- Need for full coverage with esthetic demands
c- Moderate carious lesions
d- Need for superior strength and retention
moderate carious lesions
51
All-ceramic crowns should not be used on anterior teeth if
Opposing contact is on the cervical 1/5
52
Which of the following do NOT decrease the likelihood of fracture in all-ceramic crowns
Sharp line angles
53
Which of the following should not be used to polish/contour acrylic resins
Diamond points on high speed
54
Occlusal prematurities/eccentric stops are detrimental to molars because
Off-axial loading due to the closeness of the muscles of mastication
55
When you start to make an anterior all ceramic preparation,
Axial wall depth grooves cut on the facial
56
A groove placed in a preparation should
Be 90 degrees to the axial wall
57
On a metal-ceramic crown
Approaches the pulp quickly if the reduction is greater than 1.2-1.5 mm
58
On a metal-ceramic crown
Approaches the pulp quickly if the reduction is greater than 1.2-1.5 mm
59
As one axial wall gets shorter as compared to the wall of the tooth, resistance form ___________ , this happens most often in teeth with _____________ bases
Decreases, larger
60
The treatment plan for a patient with rampant caries and plaque
accumulation is
a. To place amalgam restorations to preserve the teeth until the caries/plaque is under control
b. Not doing prosthodontic treatment until the caries/plaque is under
control
c. Motivate the patient to control their oral health and have good oral
hygiene
d. All of the above are true
all the above
61
The facial shoulder on a metal-ceramic crown should
Extend lingual to the interproximal contact
62
The wall of an anterior tooth preparation should be 2 mm when the TOC is
between 10-12 degrees. The occlusal-cervical : facial-lingual ratio should be 0.4 or higher on all teeth
1st statement is false, second statement is true
Explanation:
he wall of all teeth besides molars should be 3 mm and molars should be 4 mm. > same question idea, but was asked in an “in a study all of the following are true about adequate crown preps EXCEPT” and the incorrect answer was OC/FL ratio is at least 0.25 in all teeth (want 0.4)
63
The seating groove
a. Prevents rotational movement
| b. Limits the path of insertion to 1 direction
64
The path of insertion should be
a. Parallel to the long axis of the tooth
b. Parallel to the proximal contact points to allow seating
also, It should be determined prior to beginning preparation
65
Which of the following methods are NOT used to evaluate the occlusal
convergence
Binocular vision through the mirror
66
In a FGC, the nonfunctional cusp should be reduced ____ mm and the
functional cusp should be reduced _____ mm
b. 1.0, 1.5
67
In a collarless metal ceramic anterior crown (porcelain labial margin) what
type of margin should be used?
Radial shoulder at 90 degrees
68
With a metal-ceramic crown, which of the following is true concerning the
finish line on the facial surface
A shoulder is used on the facial (depth of 1-1.2 mm) and a chamfer is used on the lingual (0.3-0.5)
69
With all-metal ceramic crown, why is a chamfer used
a. Better able to detect with impressions/dies
b. Uses an acute angle for good closure of the margins and a closer fit
c. Ease of placement
ALL OF THE ABOVE
70
Margins on cast restorations should be placed
On enamel supragingivally
71
Open proximal contacts of a temporary restoration can cause
b. Excessive adjustment of the permanent restoration
| c. Tooth Migration
72
It is desirable to convert all of the free monomer into polymer because
a. Unreacted monomer is toxic
| b. Better mechanical properties
73
Eugenol will cause
termination
74
Which of the following is the best for direct technique and over-matrix
method
Bis-acryl resin
75
When using PMMA, a reason that you would want to choose the indirect over
direct technique is
Protection of the tissues and pulp from heat/chemicals
76
Metal ceramic restorations are indicated in all of the following except
a. Extensive tooth destruction
b. Need for full coverage with esthetic demands
c. Moderate carious lesions
d. Need for superior strength and retention
c. Moderate carious lesions
77
All-ceramic crowns should not be used on anterior teeth if
Opposing contact is on the cervical 1/5
78
Which of the following should not be used to polish/contour acrylic resins
Diamond points on high speed
79
Occlusal prematurities/eccentric stops are detrimental to molars because
Off-axial loading due to the closeness of the muscles of
| mastication
80
When you start to make an anterior all ceramic preparation
Axial wall depth grooves cut on the facial
81
A groove placed in a preparation should
Be 90 degrees to the axial wall
82
On a metal-ceramic crown
The mesial and distal walls should be perfectly parallel
The mesial and distal walls should be relatively close to parallel but they should still be a little converged. > “in a clinical study it was shown that adequate axial cervical reduction for a MCC prep can safely be placed at a depth of 2.0-2.5mm without risking exposure of the pulp”
83
To increase resistance to faciolingual horizontal dislodgment, where should
you place grooves
Mesial & distal surfaces
84
t/f: In a posterior metal ceramic crown preparation 1.00 mm occlusal reduction
should be reached when the occlusal surface is being restored with porcelain
false, you want to 2mm reduction
85
Why is a chamfer margin recommended for a metal crown margin?
a. Allows for clean margin finishing
b. Easy to place and identify on a die
c. Allows for a thin margin while maintaining adequate bulk of metal
Nearby
d. All of the above
ALL OF THE ABOVE
86
What technique is most appropriate for single unit interim crowns?
Direct Technique
87
Consider indirect vs. direct with PMMA, which one is more protective?
Indirect Protects pulp from thermal and chemical damage
88
t/f: Facial proximal and lingual proximal line angles are preserved for resistance
true
Rotational on horizontal axis
89
What type of finish line is used on a collarless metal-ceramic?
Shoulder without bevel. aka @ 90 degrees
90
Patient presents with TMJ and muscles problems; how do you treat?
further eval
91
Patient has occlusal disharmonies; what do you do?
Articulate casts and perform an intra oral exam.
92
t/f: As wall height decreases, resistance decreases. Arc of rotation happens more in teeth with wider bases.
true
93
Occlusal posterior clearance for cast gold (full metal).
1-1.5
94
Metal crowns can be used everywhere except where.
Intact facial and lingual
95
All-ceramic crowns are avoided where?
In occlusal contact in cervical 1/5.
96
t/f: Short walls cause inadequate resistance. Improved with grooves and boxes.
true
97
t/f: Posterior metal-ceramic occlusal reduction is 1.0mm.
false
1.5 for porcelain and 0.5 for metal. 2 total
98
What has the greatest polymer shrinkage and causes exothermia?
PMMA
99
Chamfer for a metal crown has an axial depth of?
0.3-0.5
100
What instrument is used to refine internal line angles?
hatchet
101
Tooth preparation is done with all of the following except?
Occlusal-cervical:facial-lingual is 0.25.
102
Incisal reduction of anterior metal ceramic.
2-2.5
103
Why is a chamfer used for a cast metal restoration?
They are easy to form, adequately distinct on the tooth and die, and provides sufficient space that the metal is adequately rigid.
104
On PFM, where does shoulder meet with chamfur?
Lingual to proximal.
105
1. Occlusal clearance for posterior ceramic crown of 1 is enough?
false
Is this talking about a full ceramic crown, if so... IDK, but if it is a PFM then it must be 2 mm= 1.5 ceramic and .5metal .
106
2. Picture of tipping tooth with short walls is about
a. Resistance
| b. Improve by- grooves/ boxes
107
5. Why use chamfer for all metal?
a. all of the above: acute angle with metal, ease of ability etc).
108
6. most teeth just have to be 2mm tall. Need to be 0.4 or higher
a. first is false, second is true
109
7. picture of prep asked what is wrong with buccal and lingual walls
a. over-converged
110
8. what type of finish line for porcelain?
a. Modified shoulder or heavy chamfer
111
9. What is the measurement of a chamfer line?
a. 0.3-0.5mm
112
10. What finishing bur not for acrylic?
diamond point on highspeed
113
11. w/o proximal contact in provisional: what happens
food impaction/perioinflamm and mesial drift leading to more final adjustments or remake needed
114
12. reason for indirect provisional
protection of pulp from exothermic heat
