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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
Q

The property to blame for failure of CL II filled resins is …

A

low wear resistance

26
Q

Arrange the following according on percent of filler content (microfill, hybrid, microhybrid)

A
  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
Q

Function of filler in composite is improve ……, and decrease …….

A
  • physical properties (compressive and tensile)

* coeficcient of thermal expansion, polymerization shrinkage, wear resistance

28
Q

The best initial seal of margins is provided by …..

A

acid etched composites

* However, this is temporary and deteriorates later

29
Q

The most important step for dentin bonding is …….

A

decalcification of intertubular dentin

30
Q

The first thing to check if the casting doesn’t sit all the way is ……..

A

proximal contacts

31
Q

Thickness of amalgam and gold when restoring a functional cusp is …….

A

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
Q

Negative rake angle burs are best used for …..

A

cutting hard materials like amalgam

33
Q

Each bur blade has 3 angles which are ……..

A

rake angle, edge angle and clearance angle

34
Q

When viewed from the facial, the premolars have their contact at ………, while the molars have ……

A

the junction of occlusal and middle third

* molars junctions are at the middle third

35
Q

When hard to distinguish between reversible and irreversible pulpitis, ……

A

do a caries control, and place IRM, then evaluate the response

36
Q

Recommended fluoride home care for patient with head and neck cancer is ……

A
  1. 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
Q

Most common used in office fluoride is …..

A

APF 1.23% (it is NaF and phosphric acid)

38
Q

The most common recommended OTC fluoride is …..

A

0.05 % NaF

39
Q

An 8.2 ounce tooth paste contains ……. mg fluoride

A

232

40
Q

Yield strength is …….

A

the stress slightly higher than the proportional limit where plastic strain occur

41
Q

Depth of class V cavity is …….

A
  1. 5 mm inside the DEJ

* 0.75 mm if the lesion is on the root

42
Q

Primary dentin is ……

A

dentin formed before closure of the apical foramen

43
Q

Pulpodental complex comprises …..

A

A delta fibers + odontoblasts

44
Q

What is the tx for condensing osteitis ???

A

No treatment, as the tooth is vital???!

45
Q

Immature apex may give …….. to thermal tests

A

false negative

46
Q

What type of avulsion is not indicated for replantation???

A

Open apex with extraoral time of > 60 mins

47
Q

Enameloplasty is indicated when …….

A

defect depth is less than 1/4 the enamel thickness

48
Q

For self etch, use …….. bur because …….

A

carbide

because diamond creates a smear layer which self etch system can’t remove

49
Q

Most common side effect of bone graft is ……

A

root resorption

50
Q

Main cause of NUG is ……

A

P. intermedia

51
Q

Main culprits of gingivitis are …….

A

P. gingivalis,,, Trep. denticola, and Tan. forsythia

52
Q

Histo of desequamative gingivitis is …….

A

plasma cells, atrophy of epi., and absence of retepigs

53
Q

Papillon defever is ……

A

a genetic disorder, causing periodontitis with palmoplantar keratoderma

54
Q

Tor limited interarch space, avoid …… implant, because they take the greatest space

A

cemented crown to abutment

55
Q

Calculus control toothpaste contains ……..

A

pyrophosphate

* decreases supragingival calculus by 30%

56
Q

Dentin abrades ….. faster than enamel

A

35 times

* 25 times faster than cementum

57
Q

The attachment appartus comprises …….

A

cementum + bone + PDL

58
Q

The difference in transeptal fibers direction between supra and infra bony pocket is ……..

A
  • 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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