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Part II > Prosthodontics > Flashcards

Prosthodontics Flashcards

1
Q

……… is the material most acceptable by soft tissue in FDP

A

glazed porcelain (better than gold)

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2
Q

Type IV gold specific gravity is ……. than base metal

A

higher

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3
Q

Relief of lingual bar should be ………

A

32 gauge wax when there is undercut only* It should be highly polished to prevent trauma to alveolar mucosa* It is pear shaped, with the tip superiorly and thick portion inferiorly

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4
Q

Teeth tipped more than ……… are not suitable as abutments

A

24 degrees

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5
Q

Cements properties:1. Lowest solubility ……2. Highest expansion …….3. Highest microleakage …….4. Very good strength ……

A
  1. resin modified GI cement (the highest is ZPC)2. resin modified GI cement (breaks full ceramic crowns, aka compomer cement)3. ZPC4. GI cement (better than ZPC & polycarboxylate). Has initial low pH
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6
Q

Nickle is added to an alloy to ……..

A

increase ductability

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7
Q

Patients with delayed healing are indicated for electrosurgery. T/F??

A

false

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8
Q

Ceramics are three types ?

A
  1. Mainly glass: high esthetic2. Particle filled glass3. Crystalline: no glass, only highly packed crystals (high strength)
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9
Q

The advantage of base metals over type IV gold are mainly …… & …….

A

high strength low density (low specific gravity)

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10
Q

Modifiers in gypsum are accelerators and retarders. List ?

A
  1. accelerators: gypsum, NaCl2. Retarders: borax, sodium citrate
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11
Q

Stone is produce by ……., while die stone by …….

A

heating gypsum to 150 C under steam pressureboiling gypsum in 30% calcium chloride & magnesium chloride

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12
Q

Which impression material releases hydrogen gas upon contact with moisture, causing voids if poured too soon?

A

Polyvinyl siloxane (addition silicone)

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13
Q

Which impression material has the highest dimensional stability? And which one has the highest wettability?

A

addition silicon (more than polyether)Hydrocolloids

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14
Q

Critical areas while taking alginate impression include ……

A

buccal of max tuberosityretromylohyoid space

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15
Q

What are the properties of polysulfide impression material????

A
  1. the catalyst is lead dioxide, responsible for black color2. produces water when setting. Wait 10 mins, then pour (should be withing 1 hour due to dimensional instability)* Need custom tray* It is exothermic, and set accelerates when contacting humidity
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16
Q

Polymerization of heat cure resin is at ….. C

A

77 degrees (above that may cause voids)

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17
Q

Diabetes is not associated with ……….

A

mucosal bleeding* Avoid porcelain teeth in diabetics

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18
Q

Christensen’s phenomenon is ……..

A

separation of posterior teeth during anterior movement of the mandible* Depends on incisal guidance & horizontal condylar guidance (increase in both of these will increase separation)

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19
Q

The borders of the occlusal plane are …….

A

the position of anterior teeth anteriorly, and 2/3 of the height of retromolar pads

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20
Q

What are the determinants and function of the compensating curve?

A

Determinants are: cusp inclination, occlusal plane inclination, and condylar inclinationFunction: achieve balancing occlusion* Note: anterior guidance should be avoided in Complete dentures

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21
Q

The purpose of recording protrusive relation is to ….

A

register the condylar path

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22
Q

Group function occlusion is also called ………

A

unilateral balanced occlusion

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23
Q

Morphology of posterior teeth is affected by ……..

A
  1. Anterior guidance (vertical and horizontal overlap. Also called anterior coupling)2. Condylar inclination (the steeper, the longer the cusps)
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24
Q

What side is …..Bennet movement? Bennet angle?

A

working side (aka. lateral shift)non working side (angle with the sagittal plane)

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25
A prerequisite for use of functionally generated pathway (functional index) is ......
retoration of a single tooth in optimal occlusion* Note: all movement of the mandible for this method should be from ECCentric to a centric position, never the reverse
26
Porcelain rusts at ........
very high temp (2000 F)
27
Most porcelain failure is due to ..........
built in stress with in the porcelain itself, leads to cracks
28
Vital appearance of teeth is mainly contributed by .....
fluorescence
29
What are the types of porcelain based on fusion temp??
1. low fusion: for metal ceramic crowns. least abrasive to opposing dentition due to finer leucite crystals. Alumina is added to prevent slumping down of porcelain in PFM crowns2. med fusion: for full jacket crowns3. high fusion: for denture teeth* note: alumina is stronger than quartz
30
Sintering is ........
changing the porcelain from powder to solid* Powder is not melted* Porcelain will become more dense
31
Precision attachments shouldn't be used with distal extension cases because .........
it will cause torquing of the abutments* Primarily used with all tooth borne dentures* full cast crown is required for the abutment
32
Degassing is necessary for .........
all gold-porcelain restorations * Necessary for bonding of porcelain due to formation of oxides on the gold surface* Needs to be due with high temp & in small time to reduce the formation of bubbles on the surface* Aka heat treatment
33
It is possible to do a cantilever of one tooth FDP if .....
at least two sound teeth are present anterior to the space
34
To decrease retentiveness of Cr-Co clasp, we can ....
1. design it to engage less undercutor 2. use a gold clasp to engage the same undercut* Gold clasp offers half the retention of Cr-Co* Proportional limit of Cr-Co is low (due to large grain size). As a result, risk of fracture increase as the bulk decrease
35
The reciprocal arm must contact the abutment at ......
opposite to the retentive arm, as the retentive tip passes over the height of contour
36
Proximal plates should extend .......... buccolingually
1/3 (or 2/3 intercuspal distance on the abutment)* Height is 2/3 of the enamel crown of abutment
37
Stability of denture is derived from .......
relationship of denture base to bone* Support is derived from occlusal rests and edentulous ridge
38
Disclosing wax adapted to denture border is useful for .......
mark the overextended denture borders* The patient must apply vigorous muscle function
39
.......... is the most important property of denture to provide proper function and patient comfort
stability
40
Altered cast technique is ........
the use of the framework with an impression tray attached to take accurate impression of the mucosa under controlled pressure* Objective: accurately relate the soft tissue surface of denture base to metal framework
41
The simplest stress breaker is ........
retentive clasp
42
The first step performed while surveying a cast is ........
establishing the guiding planes
43
What are the dimensions of the rest?
as long as it's wide (2.5 mm), bulk is 1.5 mm at the marginal ridge* The edges of triange should be rounded to permit functional movements* "Positive rest" has an acute angle with the minor connector
44
Mesiodistal width available for posterior teeth is measured from ........
the distal of canine to the upward slope of the riidge
45
A shorter clasp will require the use of .......
finer gauge wire to provide flexibility* Thicker, or wider clasps will reduce flexibility * Round cross section clasp is flexible in all direction, while half round is only flexible when the force is perpendicular to the flat surface
46
Yield strength ......... by increasing temperature
drastically decreased
47
Strain hardening is ......
hardening (deformation) of metal at room temperature* The ultimate result of work (strain) hardening is fracture (ex. bending a wire back & forth) * NOTE: surface hardness, strength, and proportional limit all increased with strain hardening, however, ductility & corrosion resistance decrease
48
Gelation is ......
the conversion from gel to sol (solidification) by decreasing temperature
49
The purpose of annealing is .....
increase ductility and strength
50
Ovate pontic is designed to ........
set in a concavity in the ridge
51
Diekeen refers to ......
high expansion, type V gypsum
52
Casts can be disinfected using ......
NaOCl
53
Before pouring ......, wait for 20 to 30 mins for stress relaxation to occur
condensation silicone | * it is hydrophobic
54
The filler in alginate is .......
dimataceous earth
55
You can delay pouring for up to one week with ........
polyvineyl siloxane (addition silicone)
56
For patients with bad oral hygiene , onlays are .......
contraindicated | * do a full crown instead
57
Collagenase is blocked by the action of the antibiotic ......
tetracycline
58
Actinomyces viscosus is strongly associated with ......
gingivitis | * No clear role in periodontitis
59
Post length should be ........
2/3 of the root length, or fill all but the apical 4 mm | * Note: post diameter should not be more than 1/3 the root's
60
Focal osteoporotic defect is usually associated with ......
areas of previous exo. | * well circumscribed lesions within the alveolar bone
61
K-flex is different than regular file in that .......
K-flex has no cutting tip * Note: Files and reamers have a triangular or diamond cross section, and it is twisted counterclockwise. NiTi files are ground, not twisted
62
Safest intracoronal bleachig chemical is .....
Sodium perborate
63
ZOE is a good temp restoration because ....
it provides a good seal
64
Initial orientation of the bur when establishing the outline form is ...
parallel to the long axis of the crown (not the tooth), especially for Mand. molars
65
In Class II prep on root surface (proximal box), the axial depth of the axio-gingival line angle is ......
0. 8 mm | * No need for deeper, because there's no risk of undermining enamel
66
Retention for large composite Class III or IV is placed .......
0.2 mm inside the DEJ (deeper may cause exposure)
67
Half life of mercury in the body is ......
55 days
68
Slot depth is ....
1 mm * prepped with an inverted cone * Note: slots and pins provide the same amount of retention
69
Major cause of loss of osseointegration is similar to ......
that of natural teeth (poor hygiene, occlusal load etc...)
70
Distraction osteogenesis is preferred when .....
large movement is needed
71
pKa for lidocaine is .....
7.9
72
Needle depth in PSA block is ........
16 mm | * Note: ASA block requires half cartridge
73
LA packaged without epi usually causes less vasodialtion, an example is .....
mepivacaine
74
Hydrophobocity and protein binding of LA affects ....
duration and potency (Bupi is highly hydrophobic) * Note: pKa affects onset. Low pKa ===> fast onset * Note: because articaine is mixed, it has shorter half life than pure amides
75
R.E.E is the origin of ........ cyst
dentigerous
76
Dermoid cyst occurs in ......
midline floor or the mouth (when above the myelohyoid), and in the neck (when below the myelohyoid)
77
Mean age of ameloblastoma is .....
40 years
78
Bremsstrahlung radiation results from
Electrons interacting with nuclei
79
The smaller the size of the focal spot, the greater ......
the resolution | * everything else is unaffected
80
If a radiograph is dark, reduce ....
the exposure time | * Note: don't change the developer parameters if they're correct
81
A tipping bend is ......, while a torquing bend is ......
* used to correct mesiodistal angulation (called second order) * used to correct labiolingual angulation (called third order) * Note: in-out bend is to rotate the tooth (called first order)
82
Reverse pull headgear may worsen .....
``` class II skeletal cases (due to pressure on chin) * Note for ortho questions: "Adolescent" patients can't wear headgear! ```
83
The least stable surgical movement of the Maxilla is .....
inferior movement
84
All anterior perm. teeth begin calcification during ....., except .......
6 month | Max. lateral incisor (starts at 1 year of age)
85
Moderately mentally challenged patient can be treated with .......
TSD method
86
The Mand. foramen in primary dentition is located ...... than plane of occlusion
lower
87
MAC for nitrous oxide is ......
105 % | * It is the conc. required to produce immobility in 50% of patients
88
.... is needed for gold PFM bonding, while ...... is needed for all other PFM types
Fe | Cr
89
Porcelain is overcontoured before firing to ......
reduce the shrinkage after firing
90
The objective of degassing is .........
remove impurities, and formation of oxides on the metal | * Must be done fast with high temp to reduce formation of bubbles
91
To reduce the slumping down of porcelain before firing, we add
aluminum oxide
92
The least rigid Max. major connector is ......, while the most commonly used is .......
horseshoe | ant-post palatal strap (6-8 mm)
93
Quenching a gold alloy from 1300F in water will make .....
a solid solution in a softened condition
94
Porcelain strength comes from ......
quartz | * feldspar reduces fusion temp., kaolin is a binder

Part II (6 decks)

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