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OPERATIVE II > operative questions > Flashcards

operative questions Flashcards

1
Q

Forming the hybrid layer consists of?
a. Acid etch
b. Rinsing tooth
c. Adhesive
d. Curing
e. All the above

A

all

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2
Q

What is the sequence of reactions for polymerization reaction?

A

activation
initation
propagation
termination

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3
Q

Beveling the gingival floor of a Class II helps with what?

A

expose enamel rods

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4
Q

f a patient has a heavy centric occlusion on number eight for a class IV, what should
you do?

A

do not place lingual bevel

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5
Q

You should remove all of the following in a class III preparation, except?
a. Gingival contact
b. Facial contact
c. Incisal contact
d. Lingual contact

A

c. Incisal contact (becomes Class 4)

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6
Q

Increasing the filler size amount will do what?

A

increase strength

(and decrease polymerization shrinkage)

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7
Q

When removing carries, all affected dentin should be removed completely (TRUE or FALSE).

A

false
remove all infected

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8
Q

the smear layer consists of what?

A

debris from bur, bacteria, cells

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9
Q

Incremental placing of composite in a Class II box will do what?

A

decreases stress

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10
Q

acid etching does what to prep

A

increases SA
and surface energy

(place for resin can penetrate to form resin tags)

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11
Q

Which would you not use to finish?
a. Pineaapple bur
b. Polishing cup
c. Diamond bur

A

pineapple

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12
Q

Which dilutes the resin matrix

A

TGDMA

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13
Q

What is the initiator for chemical cure

A

benzoyl peroxide

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14
Q

initiator for light cure

A

camphorquinone

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15
Q

Procedure of doing a composite in order

A

etch
bond
finish polish

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16
Q

You should re-etch when what happens?

A

prep becomes contaminated with saliva or blood

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17
Q

Self-etch is more predictable than total-etch (TRUE/FALSE)

A

false

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18
Q

How should you prep and restore two adjacent teeth in order if they’re next to each other.

A

prep large lesion first
restore small lesion first

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19
Q

T/F enamel wears 25-125 times easier than dentin.

A

FALSE, dentin wears faster

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20
Q

2 questions on most likely place where carious lesion are on a class III

A

lingual and gingival to contact

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21
Q

Composite sticking to instrument can do what.

A

create voids

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22
Q

Flowable for 1st increment of box.

A

increasing bond/seal
(decreases microleakage)

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23
Q

Where does Enamel bind stronger to?

A

enamel rods
NOT SIDES

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24
Q

coupling agent
couples filler with resin

A

silane

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25
Q

what do you remove

A

smear layer

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26
Q

etching will

A

increase surface area and surface energy

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27
Q

elastic modulus also means

A

stiffness

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28
Q

what do you use for class III
a. mylar strip
b. tofflemire
c. clear strip

A

mylar strip

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29
Q

palodent best used for

A

small class 2 compo

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30
Q

when more filler is added

A

increases hardness

(and increases strength and decreases shrinkage)

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31
Q

why do you use increments

A

minimize stress

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32
Q

where are dentin tubules widest

A

at pulp

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33
Q

why is bonding to dentin harder

A

dentin more heterogeneous

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34
Q

which agent serves to lower viscosity of comp resin

A

TEGDMA

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35
Q

best agent to fill abfraction/ class V lesions

A

nano and micro

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36
Q

what causes irritated tissues

A

tofflemire

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37
Q

palodent should be palced

A

1mm above margin of adjacent tooth

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38
Q

what does cure thru matrix do

A

achieve best contour (used for class v)

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39
Q

how much should you break thru facial contact in class III

A

.25mm

minimally broken

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40
Q

all the following are true about s curves but

A

make walls diverge

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41
Q

what does methacrylate monomers in bulk fill do

A

relieve stress

(reduces shrinkage stress)

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42
Q

axiopulpal line angle is BEVELED in amalgam to improve

A

resistance

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43
Q

what do you reccomend to pt with sens

A

toothpaste with KNO3 aka potassium nitrate-> blocks fluid movement

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44
Q

is it ok to leave unsupported enamel in class III prep

A

true

45
Q

what class has highest c factor

A

class I

46
Q

reason for doing flowable in bottom of box

A

improve gingival margin seal

47
Q

what should you do if you have heavy contact on L of class III

A

do not bevel

48
Q

result from comp sticking to tool

A

voids

49
Q

softest to hardest

A

cementum
dentin
enamel

50
Q

what do you do before putting on rubber dam

A

select tooth shade

51
Q

what teeth isolate

A

one posterior two anterior

52
Q

two adjacent preps:

A

prep largest first
restore smallest first

53
Q

layering technique = incremental placement and creates

A

less stress

54
Q

oxygen inhibited layer

A

kept sticky and wettability to add more comp

55
Q

gingival inflammation

A

from improper wedging

56
Q

what causes gingival irritation

A

OVERCONTOURED = most damaging to periodontitis

57
Q

dentin adhesive bonding best described by

A

collagen and resin interlocked intertubular dentin

58
Q

pt had DO done on 4. now has cold sensitivity and inflamed gums
1. causing gingivitis
2. cause of cc
3. what should you have done first

A
  1. premature occlusion ( i wanna also say it could be overcontoured on Distal thats causing gingivitis but idk)
  2. fluid in dentinal tubules
  3. condense box (or maybe prep with better matrix system???)
59
Q

lower polymerization stress shrinkage means lower c factor.
c factor is bonded divided by unbonded surfaces

A

both true

60
Q

adhesive solvent used at umkc

A

ethanol

61
Q

bonding agent ____bonds to enamel

A

micromechanical

62
Q

bonding agent ____bonds to dentin

A

micromechanical

63
Q

bonding agent _____bonds to resin

A

chemicaly

64
Q

collagen+ resin form; intertubular dentin bond here

A

hybrid layer

65
Q

Collagen and resin layer
Want to form with dentin
Interlocking of resin with demineralized collagen

A

hybrid layer

66
Q

tooth flexing and bending

A

abraction

67
Q

abfraction affects what portion of tooth

A

cervical

68
Q

prismless enamel found where

A

cervical

69
Q

bevel for class II

A

axiopulpal line angle

70
Q

what leads to most post op sens

A

bulk fill

71
Q

what do methacrylate monomers in bulk fill do

A

relieve stress

72
Q

why do you flare on cavosurface

A

to expose ends of enamel rods

73
Q

why do you NOT bevel

A

exposure sides of enamel rods

74
Q

longevity of tooth

A

fracture toughness

75
Q

stress on tooth that causes flexure and stress on cervical area of tooth

A

abfraction

76
Q

if you dont prepare with long axis of tooth, then what

A

undefined internal line angles,
inadequate retention for composite,
pulp damage (but was not option)

77
Q

bond to smear layer?

A

NO

78
Q

flare on cavosurface to expose

A

ends of enamel rods

79
Q

advantages of rubber dam

A

better visualization and access
-clean
-material works better
-prevents injury
-prevents injury

80
Q

goal of adhesive with composite
in enamel:
in dentin:

A

enamel: interlocking with enamel rods
dentin: interlocking with dentin collagen

81
Q

etch and rinse (total etch) explained

A
  1. 3 steps, 2 bottles
  2. etch
  3. prime
  4. bond

or
1. etch
2. prime+ bond
(UMKC method)

*stronger bond
*enamel ADEQUATELY PREPARED

82
Q

self-etch explained

A
  1. 2 steps, 1 bottle
  2. acid primer + bonding agent
    -acid primer partially dissolves smear layer, allows penetration of bond resin

(basically just one thing)

*will not etch unprepared enamel
*lower bond strength

83
Q

perpendicular oriented enamel

A
  1. cavosurface margins of class I prep
  2. bevels of class II prep
  3. ends of enamel rods
84
Q

parallel oriented enamel

A
  1. internal walls of occlusal preps
  2. gingival floor of box of class II preps
  3. sides of enamel rods
85
Q

ideal occlusion

A

posterior teeth axial loading
=load long axis of tooth

86
Q

max and mand functional and nonfunctional cusps

A

max
functional: lingual
non: buccal

mand
functional: buccal
non: lingual

87
Q

methods to ensure you restore patient’s occlusion properly

A
  1. check occlusion with marking paper BEFORE anesthetizing
    recreate it
  2. visually evaluate contralateral side to where working on
  3. check occlusion again when pt sitting up
88
Q

if restore wrong what happens to occlusion

A
  1. pain biting
  2. fractured cusp
  3. fractured restoration
  4. premature contact
  5. trauma on pdl
  6. trauma to TMJ
89
Q

different components of dental composite resin

A
  1. resin matrix
  2. filler particles
  3. silane coupling agent
90
Q

for regular composite, what are the difunctional monomers and which dilutes

A
  1. bis-GMA
  2. UDMA
  3. TEGDMA- this dilutes (less viscous)
91
Q

coupling agent (silane) creates better stress distribution betwen

A

resin and filler

92
Q

flowable bulk fill is in ___only
fullbody bulk fill in is

A

flowable- dentin only
fullbody- dentin and enamel

93
Q

4 types of sealants

A
  1. resin based
  2. glass ionomer
  3. polyacid-modified resin
  4. resin-modified glass ionomer
94
Q

describe resin based sealant

A

most common
not moisture friendly

95
Q

describe glass ionomer sealant

A

moisture friend
poor retention but more working time
fluoride releasing

96
Q

describe polyacid-modified resin

A

resin base with fluoride releasing and adhesive properties of glass ionomer

continuously releasing fluoride
moisture sens

97
Q

describe resin-modified glass ionomer

A

glass ionomer with resin components
longer working time

98
Q

with sealants you need a dry environment (especially for resin based) and clean area

do what and not do what to clean

A

do: use pumice and prophy brush, air, enameloplasty

DONT: use prophy paste

99
Q

preventive resin restoration PRR is done on:

sealants are done on:

A

PRR- initial caries present (cant be in dentin)

sealants - noncavitated teeth

100
Q

active ingredient in sensitivity toothpastes

A

potassium nitrate (KNO-gunpowder)

101
Q

3 different non-carious causes of class V lesions

A
  1. erosion- acid, gerd, bulimia
  2. abrasion- wear, toothbrush, bruxism
  3. abfraction- flexure of tooth, mechanical loss of tooth structure
102
Q

class III dimensions for central and lateral tooth
M-D and G-I

A

central
M-D 1.5mm
G-I 2.0mm

lateral
M-D 1.0mm
G-I 1.5mm

103
Q

retention for class III

A

incisal point
gingival groove (

104
Q

contacts of class III

A

incisal= intact
gingival=broken
facial= 0.25mm minimally broken

105
Q

class V prep

A

walls diverge
axial wall convex
bevel (increases SA retention and reduces microleakages)
add retention grooves

106
Q

causes of tooth sensitivity

A
  1. caries or leaky restoration
  2. voids-> fluid flows into voids
  3. premature contact
  4. exposed dentin->recession
  5. post-perio surgery
  6. abrasion and erosion
107
Q

use Myler strip finish when

A

in class III (matric and wedge)

108
Q

use this for added retention when cant bevel in class III

A

dovetail lock

OPERATIVE II (11 decks)

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