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Part II > Operative > Flashcards

Operative Flashcards

1
Q

Best material for Cl III cavity is …..

A

gold or amalgam

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2
Q

Best xray to see distal caries on canine is ……

A

bitewing

* Note: interproximal caries on the anterior teeth is diagnosed with PA

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3
Q

Delayed amalgam expansion is caused by ……. & ……..

A

contamination with moisture during trituration or condensation, and insufficient trituration or condensation

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4
Q

Zinc in amalgam reacts with moisture to produce ………

A

hydrogen, and this causes the delayed expansion of the filling
* Zinc is an antioxidant for other constituents

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5
Q

Minimum thickness of amalgam for adequate compressive strength is …….

A
  1. 5 - 2 mm under occlusion, or 0.75 mm in axial areas

* For cuspal coverage, thickness is 2 mm under function, and 1.5 mm under non functional cusps

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6
Q

The volume of gamma two phase in amalgam decreases ……

A

with time due to corrosion

  • Forms 10% of set amalgam in low copper alloy
  • It is responsible for corrosion, microporosities and weakness
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7
Q

Width of amalgam at the isthmus is …….

A

1/3 intercuspal distance
* Note: if extension is 2/3 the distance from the primary groove to the cusp tip, cuspal coverage is required for resistance to fracture

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8
Q

Decrease particle size of the alloy will cause …..

A

increase in compression strength and decrease setting expansion

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9
Q

Eutectic alloy is ……

A

alloy in which the elements are completely soluble in liquid solution but separate into distinct areas on solidification

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10
Q

The disadvantage of GI as a cement is …..

A

high film thickness (higher than ZPC)

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11
Q

Advantage of resin luting agent is ………

A

high compressive strength, low solubility

  • Disadvantages: irritating effect, high film thickness
  • Note: they’re the material of choice for luting all ceramic crowns
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12
Q

ZOE pH is ……..

A

7

* Note: ZOE is soluble in oral fluids, and difficult to remove from cavity prep

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13
Q

Initial pH of ZPC is ……..

A
  1. 5

* Composition is zinc phosphate and acid

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14
Q

Evaporation of water from the ZPC liquid will …..

A

prolong the setting time

* Mixing rapidly will decrease strength of cement

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15
Q

The advantages of using a cold slab for mixing are …..

A

longer working time, and shorter setting time

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16
Q

Sandwich technique is ……

A

the use of GI under composite filing (because GI bonds to composite)

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17
Q

The main function of luting cement is …..

A

act as a non permeable seal around restorations

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18
Q

The use of varnish differs with ZPC and polycarboxylate by……..

A

with ZPC, it is applied before the cement, while with carboxylate, it is applied after the cement (same with ZOE base and GI)
* Varnish life time is 1 month

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19
Q

Solution liner shouldn’t be used under composite because ……

A

it interferes with polymerization. Suspension liner is used instead (i.e bond)
* Pulp do need protection from composite (i.e use liner = bond)

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20
Q

pH of Ca(OH)2 is …….

A

11

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21
Q

Senile caries is another name for ……..

A

root surface caries in the aged

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22
Q

Etiology of root caries include …..

A

S. mutans, S. sanguis,, A. viscosus, A. naeslundii, veilonella, and lactobacilli

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23
Q

The earliest plaque bacteria is ……

A

S. sanguis

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24
Q

The initiator for VLC composites is ……

A

alpha diketone (usually, camphor quinone)

  • It absorbs energy from 474 nm light source and reacts with amines to produce free radicals
  • Note: minimum light output level is 300 mW/cm2
25
The property to blame for failure of CL II filled resins is ...
low wear resistance
26
Arrange the following according on percent of filler content (microfill, hybrid, microhybrid)
1. microfill: 50% filler, poor strength, high polish 2. microhybrid: 65% filler, good strength, good polish 3. hybrid: 70% filler, good strength, poor polish
27
Function of filler in composite is improve ......, and decrease .......
* physical properties (compressive and tensile) | * coeficcient of thermal expansion, polymerization shrinkage, wear resistance
28
The best initial seal of margins is provided by .....
acid etched composites | * However, this is temporary and deteriorates later
29
The most important step for dentin bonding is .......
decalcification of intertubular dentin
30
The first thing to check if the casting doesn't sit all the way is ........
proximal contacts
31
Thickness of amalgam and gold when restoring a functional cusp is .......
amalgam: 2.5 mm (non functional is 2.0 mm) gold: 1.5 mm (non functional is 1.0 mm) * For metal/ceramic: both cusps need 1.5 - 2.0 mm
32
Negative rake angle burs are best used for .....
cutting hard materials like amalgam
33
Each bur blade has 3 angles which are ........
rake angle, edge angle and clearance angle
34
When viewed from the facial, the premolars have their contact at ........., while the molars have ......
the junction of occlusal and middle third | * molars junctions are at the middle third
35
When hard to distinguish between reversible and irreversible pulpitis, ......
do a caries control, and place IRM, then evaluate the response
36
Recommended fluoride home care for patient with head and neck cancer is ......
0. 4% stannous fluoride or 1% neutral NaF * They need it for the rest of their lives * apply for 10 mins in a tray * Note: Tin ion in stannous fluoride is responsible for staining
37
Most common used in office fluoride is .....
APF 1.23% (it is NaF and phosphric acid)
38
The most common recommended OTC fluoride is .....
0.05 % NaF
39
An 8.2 ounce tooth paste contains ....... mg fluoride
232
40
Yield strength is .......
the stress slightly higher than the proportional limit where plastic strain occur
41
Depth of class V cavity is .......
0. 5 mm inside the DEJ | * 0.75 mm if the lesion is on the root
42
Primary dentin is ......
dentin formed before closure of the apical foramen
43
Pulpodental complex comprises .....
A delta fibers + odontoblasts
44
What is the tx for condensing osteitis ???
No treatment, as the tooth is vital???!
45
Immature apex may give ........ to thermal tests
false negative
46
What type of avulsion is not indicated for replantation???
Open apex with extraoral time of > 60 mins
47
Enameloplasty is indicated when .......
defect depth is less than 1/4 the enamel thickness
48
For self etch, use ........ bur because .......
carbide | because diamond creates a smear layer which self etch system can't remove
49
Most common side effect of bone graft is ......
root resorption
50
Main cause of NUG is ......
P. intermedia
51
Main culprits of gingivitis are .......
P. gingivalis,,, Trep. denticola, and Tan. forsythia
52
Histo of desequamative gingivitis is .......
plasma cells, atrophy of epi., and absence of retepigs
53
Papillon defever is ......
a genetic disorder, causing periodontitis with palmoplantar keratoderma
54
Tor limited interarch space, avoid ...... implant, because they take the greatest space
cemented crown to abutment
55
Calculus control toothpaste contains ........
pyrophosphate | * decreases supragingival calculus by 30%
56
Dentin abrades ..... faster than enamel
35 times | * 25 times faster than cementum
57
The attachment appartus comprises .......
cementum + bone + PDL
58
The difference in transeptal fibers direction between supra and infra bony pocket is ........
* suprabony: fibers are horizontal from cementum to cementum, above the alveolar crest * Infrabony: fibers are oblique from cementum to cementum, above the alveolar crest

Part II (6 decks)

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