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N2 > Pros > Flashcards

Pros Flashcards

1
Q

porosity in PFM

A

inadequate condensation

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2
Q

What is the weakest porcelain?

A

Feldspathic porcelain

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3
Q

Best material to oppose a porcelain crown?

A

porcelain

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4
Q

What turns a PFM green?

A

silver

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5
Q

what component makes a PFM green in the cervical 1/3

A

copper

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6
Q

What is function of opaque porcelain EXCEPT:

  • mask metal framework
  • to help come up with a base/stump shade
  • for initial bond to metal
  • to decrease contamination of additional porcelain with metal in ensuing firing and baking procedures
A

to decrease contamination of additional porcelain with metal in ensuing firing and baking procedures

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7
Q

fact: Pt had veneers cemented with light cured resin. Now comes back few weeks later with
brown staining at gingival margins. Why?
Chromogenic bacteria

A

fact: Pt had veneers cemented with light cured resin. Now comes back few weeks later with
brown staining at gingival margins. Why?
Chromogenic bacteria

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8
Q

How much tooth structure needs to removed on the facial for a porcelain veneer?
___ mm

A

0.5 mm

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9
Q

order of what you do if veneer fractures:

A

mice, etch, microetch, etch, microabrasion,

silane

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10
Q

What do you use to cement a veneer?
• Resin cement
• Polyacrylic

A

resin cement

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11
Q

minimum incisal reduction in anterior PFM

A

2mm

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12
Q

Pt has veneers from 6-11, which fluoride do you use to not stain?
A. Stannous Flouride
B. Sodium Flouride
C. Acid Flouride

A

Sodium Flouride

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13
Q

10 crown on a patient is PFM. It looks longer than #7. All of the following maybe the

reason why the crown looks like this, except?
– Incorrect shade.
– insufficient tooth prep
– too think metal
– too thick porcelain

A

incorrect shade

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14
Q

Most common reason for PFM bridge breakage?
Firing schedule,
high contact,
inadequate design

A

inadequate design

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15
Q

What prevents lingual displacement of a ¾ crown?

a. lingual wall of grooves
b. facial wall of grooves
c. facial aspect of prep

A

a. lingual wall of grooves

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16
Q

Most important dimension that ensures the metal connector between abutment and
pontic is sufficient (in 3-unit fpd bridge)?
-buccolingual
-occlusogingival
-Mesiodistal

A

occlusogingival

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17
Q

How do you decrease the width of an artificial tooth? Deepen the facial line angle proximally and increase the interproximal embrasure, Deepen the facial line angle proximally and decrease interproximal embrasure, take the facial line angle labially and increase the interproximal embrasure, take the facial line angle labially and decrease the interproximal
embrasure.

A

take the facial line angle labially and increase the interproximal embrasure

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18
Q

The strength of soldered connector of FPD in enhanced? 1. Using higher carat solder, 2.
Increasing height , 3. Increasing width, 4. Increasing gap

A

increase height

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19
Q

key vs keyway: which one is on pontic and which one is on abudment?

A

Key is within pontic

keyway is within retainer

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20
Q

What is an active screw (post) vs. inactive post?

A

An active post is one that engages (screws into) the dentin in the canal space. Traditionally, the major
concern about active posts has been the potential for vertical fracture of the tooth during placement of the
post. active posts are indicated when the canal length is insufficient to gain adequate retention with a
passive post

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21
Q

Most important when selecting shade? value, transluceny, chroma,
concentration, and hue, color .

A

value

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22
Q

When you have color index of 100, which of the following is effected?
hue/value/chroma

A

value

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23
Q

When you add a different color to a resin, you increase what? Hue? Value? Chroma?

A

chroma

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24
Q 
A dentist adjusts the shade of a restoration using a complementary color. This
procedure will result in
A. increased value.
B. decreased value.
C. intensified color.
D. increased translucency
A

B. decreased value.

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25
Q

QUESTION: What cant you change: hue, increase value, decrease value, change chroma

A

increase value

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26
Q

What complement color to darken porc? gray, orange, ochre, violet

A

orange

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27
Q

Wavelength assoc with

  • hue
  • chroma
  • value
A

hue

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28
Q

what is best way to determine value:

  • open eye as wide as you can,
  • arrange the shade guide in increasing value
A

arrange the shade guide in increasing value

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29
Q

The mesial angle of the ML of max 2nd molar occludes with what on the man 2nd molar

a. Mesial MB cusp
b. Distal MB cusp
c. Mesial DB cusp
d. Distal DB cusp

A

distal of MB cusp

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30
Q

What is Bennett angle?
a. it is the angle that is formed by the non-working condyle and the sagittal plane during lateral
movement
b. it is the angle that is formed by the condyle and the horizontal plane during protrusive movements.
c. It is an difference in condylar inclination between protrusive and lateral movements
d. It is the difference between in the condylar and incisal inclinations.

A

a. it is the angle that is formed by the non-working condyle and the sagittal plane during lateral
movement

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31
Q

what’s bennett shift?

A

lateral movement or working side

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32
Q

what type of bond is composite to tooth structure?

a. chemical bond
b. mechanical bond (micromechanical)
c. organic coupling
d. adhesion

A

mechanical bond (micromechanical)

33
Q

2 things that account for successful post composite restoration

A

Type of resin and form of prep

34
Q

C-factor?

A

bonded / Unbonded

35
Q

what’s not an indication for restoring class V abfraction?

a. sensitivity,
b. esthetics,
c. prevention of decay,
d. prevention of further structure loss,
e. restoring physiological contour

A

a. sensitivity

36
Q

MOD amalgam that passes the 1/3 distance of cusp height, do what – MOD amalgam, MOD composite, MOD onlay, MOD inlay

A

MOD onlay

37
Q

main advantage of doing direct composite over composite onlay?

a. less shrinkage-
b. better marginal adaptation -
c. greater hardness and wear resistance

A

b. better marginal adaptation

38
Q

Post op sensitivity on MOD so removed a portion of the occlusal and placed more
composite what was cause: fracture, microleakage, inadequate margins and water coming out of the
tubules, acid etch, compression pulling on cusps

A

compression pulling on cusps

39
Q

Composite recently placed. all could be a reason for sensitivity. EXCEPT:
1 etchant causes sensitivity
2 gap causing microleakage of bacteria
3 gap causing movement of fluid out of pulp
4 polymerization shrinkage that causes cuspal shrinkage

A

3 gap causing movement of fluid out of pulp

40
Q

Class 2 done without rubber dam, how long until you see microleakage:
2-4 weeks, 4-6 weeks, same time as with rubber dam on

A

2-4 wks

41
Q

Highest chance of leakage under rubber dam? Holes too wide, Holes too far apart, Too close

A

too close

42
Q

W on the rubber dam clamp means it is?

A

wingLESS

43
Q

Steps for adding to porcelain?

A

microetch, etch, silane, bond

44
Q

what’s hybrid layer?

A

bonding agent to penetrate the intertubular dentin, forming the hybrid layer (resin-dentin interdiffusion zone)

45
Q

denstist who work with HEMA( composite) can have what kinda complication?

A

contact dermatitis

46
Q

what’s the powder of GI made of?

what’s the liquid of GI made of?

A

Powder: fluoroaluminosilicate glass
Liquid: polyacrylic acid

47
Q

Why don’t you use GI resin cement in cementation of all ceramic restoration?

A

its expansion could cause cracking of porclain

48
Q

Photo initiator of composite?

A

Camphoroquinone

49
Q

Which composites have more color stability? why?

A

light cure due to Triethylene glycol

dimethacrylate TEGDMA

50
Q

What is importance of light cured vs autocured in terms of shade balance

A

the less number of nitrates when you lightcure (mem)

51
Q

curing light intensity

A

400

52
Q

What is false about LED vs halogen curing lights:

a. blue light is 340-370to 450-750
b. battery powered/cordless LED is acceptable
c. LED lasts longer than halogen
d. something about a photoinitiator
e. Blue light is not 340-370

A

a. blue light is 340-370 to 450-750

53
Q

T/F: Lasers and LED lights don’t cure all resins b/c some resins photoinitiatiors have require light sources is out of range

A

true and correct logic

54
Q

what kind of bond does GI form?

  • Covalent
  • Ionic
A

ionic

55
Q

What is compomer?

A

combined benefits of composites (the “comp” in their name) and glass ionomers (“omer”).
-GI and Composite modified with polyacid groups, used in
low-stress-bearing areas (Less wear resistant than composite, Releases fluoride)Root caries and Class V.
RMGI is better

56
Q

The strength of Zinc Oxide Eugenol can be increased by adding what?

A

Methylmethacrylate

57
Q

what is IRM?

A

ZOE + MMA

58
Q 
what do you fill a root canal with on a primary tooth:
􀁸 Gutta percha
􀁸 Sealer alone
􀁸 ZOE with accelerator
􀁸 ZOE without accelerator
A

ZOE without accelerator (to increase

59
Q 
What is the material in reinforced IRM that give it strength:
A. amalgam powder
B. Zinc phosphate
C. Poly methyl methacrylate**
D. Titanium powder
A

PMMA

60
Q

Zinc phosphate cement is used as luting agent : the initial acidity may elicit a traumatic
response if…
a. Only a thin layer of dentin is left btwn cement and pulp
b. very thin mix of cement is used
c. tooth has already a previous traumatic injury
d. No cavity varnish is used

A. a, c, & d
B. a or d
C. b only
D. all of the above

A

D. All of the above

61
Q

What does BIS-GMA in PMMA do?

A

BIS-GMA is the x-linker in PMMA

62
Q

By having excess amount of monomer in acrylic can create excessive amounts of what:

a. Expansion
b. Shrinkage
c. Brittleness
d. Harness

A

shrinkage

63
Q

relation of gypsum W/P ratio to expansion?

A

• If the water/powder ratio is increased, the expansion is reduced
(DD, Op 123)

64
Q

Gypsum: relation of spatulation to expansion

A

• The longer the spatulation time, the greater the expansion

DD, Op 123

65
Q

Amalgam: relation of trituration to expansion

A

The longer the trituration time, the smaller the setting expansion
(DD, Op 11)

66
Q

take an impression and lip immediately swells?

what do you give patient?

A

Angioedema

tx: C1 esterase inhibitor

67
Q 
Which of the following systems is thought to malfunction in the hereditary form of
angioneurotic edema?
A. C-1 esterase
B. C-1q inhibitor
C. CH50 consumption
D. Serine phosphatase
E.Complement synthetase
A

C-1 esterase

68
Q

Alginate 100% humidity: Shrinks due to:

Imbibition/Syneresis/historgysm

A

syneresis.

69
Q

when pouring gypsum material into an impression which material will cause the least amount
of bubbles? Polysulfide, polyether, silicone, irreversible hydrocolloid

A

silicone

70
Q

____ gets affected by latex (handle with latex gets messed up the sulfer
in latex gloves that retards the setting of PVS addistion silicone))

A

PVS

71
Q

arrange impression materials from best to worst dimensional stability

A

PVS (addition silicone), Polyether, polysulfide, condensation silicone, hydrocolloids
(DD, Pros 2012-13, pg 18)
wiki: dimensional stability is The degree to which a material maintains its original dimensions when subjected to changes in temperature and humidity.

72
Q

Rate impression materials from greatest to least tear strength

A

polysulfide, PVS, polyether, condensation silicone, hydrocolloids
(DD, Pros 2012-13, pg 18)

73
Q

Rate impression materials form most to least Stiffness

A

polyether, PVS, condensation silicone, polysulfide, hydrocolloids
(DD, Pros 2012-13, pg 18)
wiki: Stiffness is the rigidity of an object — the extent to which it resists deformation in response to an applied force.

74
Q

Biggest disadvantage of polyether?

A

most likely to get stuck in mouth

DD, Pros 2012-13, pg 3

75
Q

Most rigid impression material

a) polyether b) polysulfide c) PVS

A

polyether

76
Q

what material you would not use for a single crown : a) polyether b) polysulfide c) PVS

A

polysulfide

77
Q

condensation silicone releases

A

ethyl alcohol

78
Q

Addition silicone releases

A

H2

79
Q

The most stable elastic impression in moisture environment?

a. polyether
b. additional silicon
c. condensation silicon
d. polysulfide

A

addition silicone (PVS)

N2 (14 decks)

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