Spring Restorative Ii Questions

Front 1

What is placed first, the matrix or the rubber dam?

Back 1

Rubber Dam (lab)

Front 2

T or F. Always etch enamel for 15 seconds and dentin for 30.

Back 2

False, "Acid etch enamel and dentin for 15 seconds...Deciduous teeth are etched for 30 seconds" (lab)

Front 3

T or F The prep should be left slightly moist after etching

Back 3

True (lab)

Front 4

Which of the following are NOT true regarding bonding agents?
a. shaking the bonding agent can cause bubbles and should be avoided.
b. two coats may be applied
c. dispensing prior to use can cause en ethanol base to evaporate

Back 4

a. FALSE "Shake bonding agent and apply with brush to enamel and dentin" (lab)

Front 5

T or F. Light cure each increment from all sides for 40 seconds. Darker shades will require an extra 10-20 seconds.

Back 5

Both True (lab)

Front 6

Which is used first, greeny or pinky?

Back 6

Greeny

Front 7

Which is the hardest material?
a. amalgam
b. conventional composite
c. acrylic resin

Back 7

a. amalgam 165
Composite has a hardness of 55 (unfiilled resins are 20)

Front 8

Plucking

Back 8

large particles are loss from the resin matrix (acrylic and comp ppt)

Front 9

What are conventional composite restorations typically used for?

Back 9

they aren't anymore, but were used for III or IV restorations

Front 10

Attrition

Back 10

at contact areas--wear facets. Loss of material as a direct result of tooth contact

Front 11

Abrasion

Back 11

contact free areas, erosion caused by tooth brushing or food passing over surface

Front 12

What are fillers coated with in today's composites?

Back 12

coupling agent like silane

Front 13

T or F the smaller the filler size the thicker the consistancy

Back 13

True (acrylic and comp ppt)

Front 14

The resin most commonly used in today's composite is

Back 14

BIS-GMA (bis-phenol A and glycidyl methacrylate) or UDMA (urethane dimethacrylate)

Front 15

T or F TEG-DMA is thick as molasses at room temperature and BIS-GMA is used to dilute the resin into a fluid consistency

Back 15

FALSE, the two are switched (acrylic and comp ppt)

Front 16

The organic material is the resin. The Inorganic loading is refering to the glass particles.

Back 16

true (dan said in class)

Front 17

Silane is
a. resin
b. used to dilute resin
c. coupling agent
d. filler glass

Back 17

c. coupling agent that coats fillers (acrylic and comp ppt)

Front 18

Barium, aluminum, strontium zinc, and zirconium is primarily used in composites for:
a. coats the fillers and acts as a coupling agent
b. increased strength
c. dilutes the resins into a fluid consistancy
d. increases the radiopacity

Back 18

d. increases the radiopacity (acrylic and comp ppt)

Front 19

T or F Resin is very thick as room temperature

Back 19

true

Front 20

What is UDMA?

Back 20

Resin

Front 21

What is BIS-GMA

Back 21

resin, very thick at room temperature

Front 22

Ideal or Shallow Cavity Prep

Back 22

removal of lesions that are incipient and those that have not penetrated deeply into dentin (cavity classification)

Front 23

Moderate Prep

Back 23

removal of lesions that have penetrated comparatively deeply into dentin without encroaching upon the dental pulp (cavity classification)

Front 24

Deep Prep

Back 24

lesion very close to the pulp, thin layer of intact dentin remains.

May look pinkish and need indirect pulp cap.
(cavity classification)

Front 25

Pulpal Exposure

Back 25

removal of lesion extended into the pulp

Requires direct pulp cap or endodontic treatment
(cavity classification)

Front 26

T or F. The # for filler volume is typically higher than the # for % weight in dental materials

Back 26

FALSE, the opposite

Front 27

T or F Midsize Hybrid has the highest % filler volume and weight % in comparison to small hybrid, Conventional composite, microfilled and unfilled.

Back 27

TRUE

Front 28

Which of the following is NOT true
a. Conventional composite= 50-60% volume, 70-80% weight
b. Microfilled- 30-40% volume, 50-75% weight
c. Flowable-- 40-50 % volume, 45-68 % weight

Back 28

b. Microfilled- 30-40% volume, 50-75% weight

Microfilled is ACTUALLY 40-60% volume, but is 50-75% weight

Front 29

The smaller the particles in composite, the lower the polishability. However, smaller filler size also equals a thicker consistency.

Back 29

First FALSE, second TRUE
Smaller particles makes it easier to polish .

Front 30

What am I talking about?
Basic Component is Methyl Methacrylate
First used as an esthetic filling matierial in late 40's
Low Knoop #-20
Thermal Expansion- 92
Severe leakage leads to pulp reaction
7% polymerization shrinkage
Low modulus of elasticity (flexible 2.4 GPa)

Back 30

Acrylic Unfilled Resins

Front 31

When monomers react to form polymer the chemical reaction is called

Back 31

polymerization

Front 32

Traditional First Generation filled resin is
a. Type I resin
b. Type II resin

Back 32

b. type II

Front 33

T or F Both resin and filler glass or quartz are inorganic

Back 33

First FALSE Resin is organic, however glass and quartz are inorganic

Front 34

FIllers are coated with a coupling agent such as...
a. Barium
b. Strontium Zinc
c. Zirconium
d. Silane

Back 34

d. Silane

Front 35

What is NOT true about BIS-GMA
a. A resin commonly used
b. Very thick at room temp
c. bis-phenol A and glycidyl methacrylate
d. the same as UDMA

Back 35

d. UDMA is also a resin commonly used but it is urethane dimethacrylate

Front 36

What is TEG-DMA?
a. a. used to dilute the resin into a fluid consistency
b. a coupling agent used to coat fillers
c. triethylene glycol dimethacrylate
d. A & B
e. A & C
f. All of the above

Back 36

e. A & C

Front 37

Light sources used today
a. halogen lights
b. light emitting dioes
c. lasers
d. all of the above

Back 37

d. all of the above

Front 38

Which of the following are not true about basic trends in current curing techniques
a. depth of cure is approximately 2mm
b. darker color require more time
c. time should be doubled if there is a deep prep (over 5mm)
d. lights are electric
e. composite cure better when warm
f. polymerization shrinkage toward light may or may not effect bond

Back 38

d. false, lights can be electric or battery

Front 39

T or F % inorganic loading will tell you how durable the material will be in stress bearing situations and how fracture resistant it will be

Back 39

TRUE

Front 40

Microfills are lightly filled and have high fracture, attrition and abrasive resistance

Back 40

FALSE, Microfills are lightly filled and have POOR fracture, attrition and abrasive resistance

Front 41

T or F Hybrids are heavy filled and have a high fracture and abrasive resistance

Back 41

TRUE
Midsize hybrid 65-70% volume and 80-90% weight
Small Hybrid 50-60% volume and 75-80% weight

Front 42

What material was used as an answer to problems with filler size and loading? (It was not possible to heavily load composites with material with all submicron fillers)

Back 42

Nanofilled (1000 of micron- .002)

Front 43

What is the following material?
Particle Size -- submicron (.02-.04)
Filed 50-75% by weight
Prepolymerized fillers used to increase small size filler content
Smooth surface, very polishable, no plucking, can be used in class V from lower elastic modulus and will flex with tooth

Back 43

Microfill composites

Front 44

What are some disadvantages of microfill composites?
a. high thermal expansion because of more resin
b. low knoop #
c. polymerization shrinkage only slightly less than conventional
d. fatigue fracture
e. wear from abrasion and fatigue failure

Back 44

All

Front 45

T or F The smaller the filler size, the more polishable the composite will be

Back 45

TRUE

Front 46

What is fatigue fracture?

Back 46

as material flexes or deforms cracks form in the resin from stress and over time they start to connect causing faulure or fracture. Related to elastic modulus

Front 47

Phosphoric Acid + Silicate Glass =

Back 47

Silicate Cement

Front 48

Phosphoric Acid + Zinc Oxide =

Back 48

Zinc phosphate

Front 49

Polyacrylic Acid + Silicate Glass=

Back 49

Glass Ionomer

Front 50

Polyacrylic Acid + Zinc Oxide=

Back 50

Polycarboxylate

Front 51

Eugenol + Zinc Oxide =

Back 51

ZOE

Front 52

Dimethacrylate monomers + Silicate Glass =

Back 52

Resin

Front 53

Eugenol + Silicate Glass =

Back 53

Nothing, this is not done

Front 54

Dimethacrylate monomers + Zinc Oxide =

Back 54

Nothing, not done

Front 55

What is one of the biggest problem for esthetics for microfill?
a. plucking
b. low knoop
c. show through of tooth color

Back 55

c. show through, also they absorb water over time and tend to swell, stain from coffee soda etc.

Front 56

T or F Microfills are not typically places in stress bearing areas and not acceptable for posterior composite because of the wear

Back 56

TRUE

Front 57

You can use micro fills where...
a. Class I
b. Class II
c. Class III
d. Class IV (not in occlusion)
e. Class V

Back 57

c. Class III
d. Class IV (not in occlusion)
e. Class V (good for flexing of cervical 1/3 and abfraction)

Front 58

Particles in nano technology
a. are amorphous
b. are spherical
c. are ground

Back 58

b. are spherical

Front 59

T or F Nano Hybrids is heavier loaded with smaller particles and has the advantages of hybrids with high strength, low wear and smoother surfaces for optimal esthetics

Back 59

TRUE

Front 60

Midsize hybrid has more compressive strength than conventional and microfilled and coefficient of thermal expansion is more than both.

Back 60

First is true, second is false

coefficient of thermal expansion is LESS than both.

Front 61

Which of the following are NOT true for midsize hybrid?
a. surface smoothness is better than microfills and conventional
b. knoop hardness is 50-60 (in comparison to Cov 55 and microfilled 25-30)
c. More wear resistant than conventional and microfilled
d. filled 80-90% by weight
e. Polymerization shrinkage slightly lower than conventional

Back 61

a. FALSE, surface smoothness is INFERIOR to microfills and BETTER THAN conventional

Front 62

Transformation Toughening

Back 62

fillers absorb some of the occlusal force or energy and there's less stress placed on the resin.

Front 63

How are wear resistance and elastic modulus related?

Back 63

decrease interparticule distance reduces deformation of resin matrix when stresses are applied.

Front 64

Midsize hybrid can appropriately be used in stress bearing areas (class IV and II) and is semi-polishable (not as polishable as microfills or small hybrids)

Back 64

TRUE

Front 65

How much are small hybrid filled by weight?

Back 65

75-80%

Front 66

T or F Small Hybrid composite have the same wear resistance, fatigue fracture and transformation toughening as midsize hybrid but has a slightly lower elastic modulus than conventional.

Back 66

TRUE

Front 67

Small hybrid has a lower elastic modulus than conventional composite but less fatigue fracture because there are more smaller particles present.

Back 67

TRUE

Front 68

List in order of polishability

Back 68

Unfilled (EXTREMLY)
Flowable (SUPER)
Micro (SUPER)
Small (Polishable)
Mid (Semi)

Front 69

Advantages of flowable composites

Back 69

Low Elastic Modulus Good for Class V
Wets surfaces, flows in corners
Fast and East to place

Front 70

Disadvantages of flowable composites

Back 70

poor physical properties
can not have any direct occlusal contact
more shrinkage

Front 71

Which is NOT a flowable composite use
a. Class I
b. Class II
c. Small undercuts
d. Class III
e. Class V

Back 71

d. Class III

(you can do class I they just have to be minimal in open and seal etc.)

Front 72

Composite Mechanical Properties Ranking

Back 72

Midsize Hybrid
Small Hybrid or Nanofilled
Conventional
Microfilled
Flowable
Unfilled

Front 73

Glass Ionomer Advantages

Back 73

Fl release
Bond to tooth and metal
However, limited mechanical prop

Front 74

Composite Advantages

Back 74

durability, bond to tooth, esthetics, BUT technique sensitive

Front 75

Ceramics advantages

Back 75

ultimate esthetics, imited to inderect fabrication poor wear compatibility with natural dentition

Front 76

What is aluminum shell?

Back 76

Temporary, pre-formed anatomical shape and size, soft material that wont withstand occlusion for long, trimmed with scissors and quickly placed, may be poor fit

Front 77

Polycarbonate crown

Back 77

Plastic--esthetic temporary
Anteriors, medium time
Easy place and trim, doesn't fit as well
Used commonly on deciduous teeth

Front 78

Acrylic temp direct technique

Back 78

mix equal portions from tube
place in alginate impression
place over prep
remove and trim
temp cement onto prepped tooth

Front 79

T or F Stainless steel crowns can be used as a temporary for posterior permanent teeth

Back 79

TRUE

Front 80

T or F Compomers are most effective when they are bonded to tooth with dentin/enamel bonding agents similar to composites

Back 80

TRUE

Front 81

T or F Compomers are better than composites because they have fluoride release, anticariogenic, not as sensitive to moisture and low expansion/contraction.

Back 81

TRUE

Front 82

T or F Compomers are better than RMGI and GI ionomers because they are easier to polish, more sculptable (not as sticky as GI) and more soluble, higher strength and better esthetics than GI.

Back 82

FALSE, is it LESS soluble than GI

Front 83

Where are compomers used?
a. class V
b. Root Caries
c. Geriatric
d. Pedo Patients

Back 83

true

Front 84

What is the matrix made of in compomers?

Back 84

UDMA, tetracarboxylic acid and HEMA

Front 85

T or F Compomers have essentially the same composition as composite except contain a carboxylic acid group which is similiar to traditional and RMGI

Back 85

TRUE

Front 86

Ceromer is made of:
a. ceramic fillers
b. Polymer (resin) filler matrix
c. Reinforced composite framework
d. all

Back 86

d. all of the above

Front 87

T or F An advantage of compomer is that it is more brittle than composite, poor compatibility with nature teeth, wears teeth more.

Back 87

FALSE, that is ceromers

Front 88

How are flowable composites different than regular?

Back 88

are less filled and have more resin

Front 89

________ is the ability of a substance to flow over the entire surface.

Back 89

Wetting

Front 90

T or F Greater surface energy=greater adhesion

Back 90

TRUE

Front 91

T or F A liquid that balls up like mercury would have high surface energy and poor wetting.

Back 91

TRUE

Front 92

T or F Enamel is hydrophillic, 50% inorganic, 20% water and 30% organic.

Back 92

DENTIN is hydrophillic, 50% inorganic, 20% water and 30% organic.

Front 93

T or F Enamel is hydrophobic, 95% inorganic, 4% water, 1% organic (collagen)

Back 93

Enamel is HYDROPHILLIC, 95% inorganic, 4% water, 1% organic (collagen

Front 94

T or F Resins are hydrophobic

Back 94

TRUE

Front 95

Where is the highest number of tubules found?

Back 95

near the pulp, lowest are near the DEJ

Front 96

T or F Enamel bonding agents were developed to enhance wettability of resins to etched enamel and improve mechanical bond

Back 96

true

Front 97

Why did early dentin bonding agents fail?
a. thermal coefficient of expansion
b. polymerization shrinkage
c. bonded to collagen or Ca of smear layer

Back 97

ALL

Front 98

The ideal dentin bonding system shuold have a hydrophilic component

Back 98

YES but it should also have a hydrophobic component

Front 99

Why is dessicating the tooth so bad for bonding?

Back 99

dehydration of teh colagen network will limit the penetration of monomers and cause sensitivity from gaps

Front 100

What do conditioners/etchants do?

Back 100

mild acid, removes or alters smear layer by demineralizing hydroxyapatite--better pores, improves surface so primers or adhesives can wet the surface better (exposes collagen network), reuce intertubular fluid flow (adhesive plugs them)

Front 101

Primers are hydro_____ which provide a ______ bond to the tooth. It also provides a ______ bond to the smear layer

Back 101

Primers are hydroPHILLIC which provide a CHEM and MECH bond to the tooth. It also provides a CHEM bond to the smear layer

Front 102

HEMA is not a resin even though it contains methacrylate. What is it?

Back 102

An aqueous solution of hydrophilic methacrylate monomers.
Found in Scotchbond

Front 103

T or F Scotchbond is a light cured resin base with a combination of HEMA (hydrophobic) and BIS-GMA (hydrophillic)

Back 103

FALSE Scotchbond is a light cured resin base with a combination of HEMA (hydroPHILLIC) and BIS-GMA (hydrophOBIC)

Front 104

First generation Bonding Agents were essentially ______ bonding agents.
They failed because...

Back 104

Enamel Bonding
Crystallized on the surface, poor bond strength, poor wetting, non-hydrophillic

Front 105

Second Generation Bonding Agents (Dentin)
• Started the use of _____ composites
• Had a _____ bond

Back 105

• Started the use of posterior composites
• Had a MECH bond--originally thought to chemically bond to Ca and Smear layer

Front 106

Third Generation Bonding Agents Dentin
had ______ bond strength and bonded to _______ dentin.

T or F They used primers or conditioners that altered the smear layer and adhesive that bonds to the tooth

Back 106

Third Generation Bonding Agents Dentin
had WEAK bond strength and bonded to DRY dentin

and TRUE

Front 107

Dentin Bonding Agents 4th generation
Total Etch technique with consisted of
what three things?

Back 107

1. dentin conditioner (etch)
2. Primer (wetting agent)
3. Bonding Agent (adhesive)

Front 108

Which generation of dentin bonding agents was the first to use total etch technique?

Back 108

4th

Front 109

T or F Fifth generation bonding agents are applied to the surface and then dried (primer and adhesive were combined)

Back 109

TRUE

Front 110

T or F Etchant is 25% phosphoric acid

Back 110

FALSE 35% phosphoric acid

Front 111

Sixth generation bonding is Self-etch bonding and the etch, priming, and bond are all in one.
• The adhesives are ____ based
• ________ technique sensitive steps and ________ risk of error

Back 111

• The adhesives are WATER based
• LOWERS_ technique sensitive steps and LOWERS risk of error

Front 112

What is an example of a sixth generation self-etch bonding agent?

Back 112

Adper Prompt L-Pop

Front 113

T or F In Self-Etch All-In-One, the red blister contains irritators and stabilizers while the yellow blister contains stabilizers

Back 113

TRUE

Front 114

According to Ron Jackson, how far can the primer penetrate?

Back 114

6 microns, so don't etch more than 15 seconds

Front 115

Why don't you dispense bonding agent until right before use?

Back 115

alcohol or acetone will evaporate

Front 116

Which generation of bonding agent has the highest bond strength?

Back 116

4th generation (90% retention)
then 5th (85%)
then 6th

Front 117

Why does gluma work for sensitivity?

Back 117

has water