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Direct Restoration > Lecture 4 Reding > Flashcards

Lecture 4 Reding Flashcards

1
Q

composite:

A

compound of 2+ diff. materials w/ props that are superior or intermediate to those of the individual consituents

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2
Q

Organic matrix of enamel:

A

enamelin

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3
Q

Inorganic matrix of both enamel and dentin:

A

hydroxyapeptite

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4
Q

Organic matrix of dentin:

A

collagen

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5
Q

Advantages of RBC(Resin Based Composites)

A

resist fracture and wear, set on command (when ready), conservative prep, low heat conductivity, no current conduction, radiopaque

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6
Q

RBC prep requires removal of:

A

only the lesion

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7
Q

Disadv’s of RBC:

A

shrink (2-4%), DBA and lite curing, tech sensitive, lengthy placement, RD required, water sorption (amlgam does not)

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8
Q

Amalgam is more technique flexible than RBCs

A

T

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9
Q

T or F? Amalgam has high sorption.

A

F.

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10
Q

RBC components:

A

4: Polymer matrix (resin monomers) Resin fillers, coupling gent, initiators to start rxn

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11
Q

Continuou phase to which other ingredients are added:

A

Organic polymer matrix

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12
Q

Bis-GMA:

A

bishpenyon-A-glycidyl methacrylate

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13
Q

% of high vs. low weight polymers in organic matrix RBCs:

A

70% high molecular weight / 30% low

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14
Q

Examples of high molecular weight polymers:

A

Bis-GMA, UDMA,

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15
Q

Low l=molecular wight/low viscosity:

A

TEG-DMA

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16
Q

Low shrinkage monomer

A

Bis-EMA or oxybismethacrylate

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17
Q

What is the part of the RBC that shrink?

A

the matrix

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18
Q

Inorganic Fllers:

A

Quartz or Glass based (zirconium oxide,aluminum oxide, or silicone dioxide?)

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19
Q

Quartz inorganic fillers:

A

fused silica, lithium aluminum silicate

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20
Q

Glass inorganic fillers:

A

borosilicate, ziconium, barium, strontium

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21
Q

Fillers improve these properties:

A

color stability, reduce water sorption, comp and utensil strength, reduce coeff of thermal expansion, reduce shrinkage, imp wear resistance

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22
Q

What part of a RBC is responsible for water sorption and weakness and shrinkage ?

A

matrix

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23
Q

% V that inorganic fillers account for:

A

30-70% of the composite

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24
Q

% weight that inorganic fillers account for:

A

50-85% of the composite

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25
Q

Coupling agents are aka:

A

silanes

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26
Q

Functions of coupling agents;

A

coats filler particles promoting adhesion to the matrix, polymerizable silica-reactive monomer. Provides adhesion to silaceous surfaces

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27
Q

Does the addition of a weak matrix to a strong filler lead to the formation of a weak or strong composite?

A

weak

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28
Q

Does the addition of a weak matrix to a strong filler and silane lead to the formation of a weak or strong composite?

A

strong

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29
Q

Modes of initiators:

A
  1. chem run of mixed composites 2. exposure to light
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30
Q

Most current composites are activated by:

A

exposure to visible light (460-480nm) blue light

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31
Q

What color light activates current composite?

A

blue

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32
Q

Initiator and activator for chemically activated systems:

A

init: benzoyl peroxide act: aromatic tertiary amine (2%) (N,N-dimethyl-p-toluine)

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33
Q

Initiator and activator for light-activated systems:

A

Init:Alfa-diketone camphorquinone Act: aliphatic tertiary amine (0.01-0.04%) +468nm light

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34
Q

Volumetric shrinkage of RBC can be up to:

A

7%

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35
Q

Coefficient of thermal exp:

A

2-6 X (30-60 ppm/’ C) that of dentin (9 ppm/’ C)

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36
Q

Enhanced flowability vs.

A

increased risk of porosity

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37
Q

To prevent resin from sticking to instrument:

A

alcohol gauze

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38
Q

Traditional RBCs are what type?

A

macrofilled (10-100um)

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39
Q

Macrofilled RBCs:

A

ground quartz, 70-80% filled by weight, pronounced plastic deformation, micro leakage, water sorption, surface staining, intrinsic discoloration

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40
Q

Microfilled composites (0.01-0.1um):

A

only sub micron particles, ground to 5-50um & incorporated into additional microfilmed material

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41
Q

benefit of combining sub micron particles with additional microfilled particles:

A

filler content is maximized, polymerization shrinkage is minimized

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42
Q

When to use microfilmed composites:

A

non-stressbearing areas (anterior)

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43
Q

Microfilled composites use:

A

colloidal silica as a filler and pre polymerized particles

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44
Q

Properties of microfilled composites:

A

low shrinkage and highly polishable

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45
Q

Advantages of microfilm resins:

A

excellent polish, highly esthetic areas (class V, composite veneers)

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46
Q

Disadvantages of microfilm resins:

A

low strength (don’t use for Class IV), water absorption may be higher compromising long-term color stability

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47
Q

hybrid resins are blends of:

A

0.04um and small particles (1-4um)

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48
Q

The combination of filler article sizes allows:

A

the highest levels of filler loading with the corresponding improvement in physical properties

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49
Q

Do hybrid resins have less or more internal discoloration?

A

less

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50
Q

Which has the best properties, traditional, microfill, or hybrid?

A

hybrid

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51
Q

Which polishes better, hybrid or microfilm composites?

A

microfills

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52
Q

T or F? Hybrid composite are radiolucent.

A

F.

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53
Q

For which area are hybrid composites indicated>

A

stress bearing (posterior)

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54
Q

Which are more esthetic, hybrid or microfilm composites?

A

hybrid (monochromatic)

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55
Q

Benefit of micro-hybrid composites:

A

combine polishing props of micro with the strength of hybrids

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56
Q

Avg particle size of Micro-hybrid or nano-filled:

A

less than 1um

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57
Q

Ex of Micro-hybrid or nano-filled composites:

A

Esthet-X (caulk) and Point 4 (Kerr)

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58
Q

T or F? Flowable composite is more resistant to wear.

A

F. less

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59
Q

Filler by volume % of flowable composite:

A

37-56%

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60
Q

Does flowable composite have high or low polymerization contraction?

A

high

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61
Q

Are flowable composites more or less elastic?

A

more (flees with tooth)

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62
Q

flowable composite is indicated for:

A

very small Class V, sealants, liner under high C-factor preps

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63
Q

Any light unit with a range of these wavelengths can be used for visible light curing units:

A

400-500nm

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64
Q

How to test your light curing unit:

A

radiometer

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65
Q

Extent of composite polymerization depends on:

A

Wavelength of light, light intensity, exposure time, distance from light, shade of resin composite

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66
Q

CAMBR

A

Carries Mmgmt by Risk Assesement

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67
Q

Main components of MID:

A

assessment of disease risk, w/ focus on early detection and prevention, external and internal remineralization, use of a range of restorations, dental material and equip, and surgical only when required and after disease controlled.

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68
Q

When should surgery be done according to MID?

A

only when required and only after disease has been controlled

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69
Q

High risk protocol:

A

F varnish every 3mo, Rx paste 2X/day, including before bed (pos teeth could be sealed if at risk)

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70
Q

Moderate risk protocol:

A

F varnish every 6mo, OTC paste 2Xday, OTC rinse 1-2Xday (pos teeth could be sealed if at risk)

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71
Q

Low risk protocol:

A

OTC paste 2Xday

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72
Q

Antibacterial rinse:

A

Chlorohexadine (does not reduce caries) 1st wk of each mon

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73
Q

MI paste:

A

Ca and P remineralize tooth

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74
Q

Xylatol:

A

Replacement for sugar, can be prescribed

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75
Q

T or F? Demineralization indicates an active lesion.

A

F. Not always

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76
Q

PTPM:

A

Plaque control, Tx of existing caries lesions, Protection of surfaces at risk, and Maintenance for prevention

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77
Q

ICDAS Score of 1(or2) for caries mgmt:

A

no caries lesions or arrested caries lesion in fissure with caries-susceptible morphology

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78
Q

ICDAS Score of (1) or2 for caries mgmt:

A

suspected but no distinct evidence of caries lesion at base of fissure

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79
Q

ICDAS Score of 3,4,5,6 for caries mgmt:

A

Obvious cavitation or radiographically evident carious dentin at base of fissure

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80
Q

Tx for ICDAS Score of 1(or2) for caries mgmt w/ low risk:

A

No tx

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81
Q

tx for ICDAS Score of (1) or2 for caries mgmt:

A

Sealant

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82
Q

Tx for ICDAS Score of 1(or2) for caries mgmt w/ mod or high risk::

A

sealant

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83
Q

Tx for ICDAS Score of 3,4,5,6 for caries mgmt:

A

restoration

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84
Q

Placement of sealant:

A

external 0.5mm of fissure (to provide sound enamel for bond)

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85
Q

Use are to dry possibility active lesion for this ICDAS score:

A

3

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86
Q

Tx for ICDAS score of 3 w/ an active, non-proximal corona lesion:

A

lesion arrest (remineralization or resin infiltration) and recall for reveal of risk status and lesion

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87
Q

What is resin infiltration?

A

?

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88
Q

Mgmt of caries lesion in root surfaces of permanent teeth: lesion hard to explorer; stained or unstained, moderate or high risk:

A

lesion arrest (remin therapy)

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89
Q

Mgmt of caries lesion in root surfaces of permanent teeth: lesion hard to explorer; stained or unstained, low risk:

A

monitor lesion at periodic reeval appt

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90
Q

Mgmt of caries lesion in root surfaces of permanent teeth: lesion soft to explorer and est. depth less than 0.5mm:

A

Lesion arrest (remin therapy)

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91
Q

Mgmt of caries lesion in root surfaces of permanent teeth: lesion soft to explorer and est. depth less than 0.5mm. We did remain therapy and after 3-6 mo the lesion progressed:

A

Restoration (Rc, RMGI, or sandwich)

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92
Q

Mgmt of caries lesion in root surfaces of permanent teeth: lesion soft to explorer and est. depth greater than 0.5mm:

A

Restoration Restoration (Rc, RMGI, or sandwich)

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93
Q

Mgmt of caries lesion in root surfaces of permanent teeth: lesion soft to explorer and est. depth less than 0.5mm. We did remain therapy and after 3-6 mo the lesion did not progress, moderate or high risk pt:

A

Lesion arrest (remin therapy)

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94
Q

Mgmt of caries lesion in root surfaces of permanent teeth: lesion soft to explorer and est. depth less than 0.5mm. We did remain therapy and after 3-6 mo the lesion did not progress, low risk pt:

A

monitor lesion at period eval appt.

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95
Q

T or F? A caries lesion can be arrested, but not reversed.

A

F

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96
Q

Ways to remineralize:

A

change oral hygiene, change diet, apply fluid, stimulate saliva

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97
Q

What can you do for a pt with chronic dry mouth?

A

prescribe saliva substitute with inorganic ions

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98
Q

In one study, sugar-containing foods were not assoc with caries experience unless:

A

the kid brushed once a day or less

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99
Q

How can a person with open embrasures keep their mouth cleaner?

A

interproximal brushes

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100
Q

How can a periodontal pt keep their mouth cleaner?

A

interproximal brushes

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101
Q

How can a pt with closed interdental spaces keep their mouth cleaner?

A

floss

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102
Q

Floss __times a day for caries prevention.

A

1

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103
Q

Floss __times a day for gingivitis.

A

2

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104
Q

Antimicrobials that have been added to F:

A

amine (Am) and stannous ions (Sn)

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105
Q

What intrinsic properties does Amine have?

A

antiglycolytic properties

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106
Q

Which as stronger antimicrobial effect, amine fluoride or sodium fluoride?

A

amine F

107
Q

T or F? Stannous effects mineral dissolution.

A

F. It has antimicrobial activity (SnF2)

108
Q

Which is better at inhibiting plaque formation AmF/SnF2 or other fluoride combinations?

A

AmF/SnF2

109
Q

How is AmF/SnF2 effective at low concentrations?

A

by slowing bacterial growth through the inhibition of bacterial metabolism (i.e. acid prod)

110
Q

This added to toothpaste provides antibacterial effects by disrupting bacterial cells walls:

A

Triclosan

111
Q

Mechanism of Triclosan having antibacterial effects:

A

disrupts bacterial cell walls

112
Q

This would be considered a lower-level F dentrifice:

A

1,100 ppm F (25% reduction in caries)

113
Q

Use of lower-level F dentrifices offers a __ % reduction in caries:

A

25%

114
Q

High-F dentrifice (ppm?):

A

5,000 ppm

115
Q

Use of a high-level F dentrifice offers a __ % reduction in caries:

A

75%

116
Q

What to do when plaque control is not sufficient?

A

topical F solution, gels, or varnishes. Suggest sugar-free gum. Then brush 3Xday (or rinse/tablet)

117
Q

Stains plaque pink to see how well pt is brushing:

A

disclosing solution

118
Q

Available strengths of OTC F rinses:

A

0.02% and 0.05% NaF

119
Q

Reduction in caries with F gel:

A

21%

120
Q

strengths of Rx F gel:

A

1.1% NaF

121
Q

Rx strength NaF rinse:

A

0.2% NaF

122
Q

Avg caries reduction w/ Rx strength NaF rinse:

A

30%

123
Q

Mouth rinses have been made with:

A

acidulated P F (APF), stannous F, ammonium F, and amine F

124
Q

Benefit of acidulation:

A

may increase the F uptake into the tooth mineral

125
Q

How does acidulation work?

A

It causes mild etching of the enamel, which creates micropores for better F diffusion & inc SA

126
Q

Etching may cause the transfortmation of apatite to:

A

brushite

127
Q

What happens to brushite when exposed to low conc F/

A

recrystallizes into fluorapatite

128
Q

When will brushite recrystallizes into fluorapatite most readily?

A

low F/Ca ratio

129
Q

What about APF enhances F uptake by enamel?

A

the low pH

130
Q

The presence of this (with APF) prevents enamel dissolution by surrounding the tooth with P ions:

A

orthophosphate

131
Q

Many rinses recharge:

A

glass-ionomer restos

132
Q

Why are APF solution contraindicated for pts with glass-ionomer restos, por crowns, and veneers?

A

The acidic topical F degrades them

133
Q

Which ionomer is more resistant to surface degradation than glass-ionomers?

A

RMGI

134
Q

The application of acidic F solutions produces what for pts with resin composites?

A

filler dislodgment and destruction of the filler-resign matrix interface

135
Q

Food products that Xylitol can be found in:

A

gum, oral syrup, and gummy bears

136
Q

Why is xylitol non-cariogenic?

A

bacteria can’t metabolize this sugar

137
Q

Xylitol gum should be recommended for these pts;

A

moderate-high-risk pts, hyposali-vation

138
Q

Ca agents added to pastes:

A

nanohydroxyapptite, (nHAP), tricalcium phosphate (TCP), alcium sodium phosphosilicate (NovaMin, NovaMin Technologies), and amorphous calcium phosphate (ACP)

139
Q

Products with functionalized TCP improve:

A

remineralization of white spots

140
Q

NovaMin-based pasts release:

A

Na, Ca, and P, resulting in the formation of crystalline hydoxycarbonate apatite layer

141
Q

T or F? ACP technology is based on stabilized ACP.

A

F. unstabilized

142
Q

Explain how unstabilized ACP works:

A

Ca salt and a P salt are separately added to mouth via dual chamber device. The salts release Ca and P ions resulting in immediate precip of ACP or amorphous C F phosphate (ACFP). These are unstable and form hydroxyapatite and fluorhydroxyapatite

143
Q

What type of caries do ACP-based rinses lower the incidence of?

A

root caries (and promot remain of enamel (e) subsurface lesions)

144
Q

What is the health concern with ACP-based rinses?

A

may promote calc formation w/ long term use

145
Q

Why is frequent eating bad for your teeth?

A

pH issn’t allowed to neutralize, and demin outweighs remin

146
Q

Diet suggestions:

A

Combine cooked & processed foods w/ nonacidogenic foods, include foods of firm or hard texture, choose good fats that will coat tooth surface and reduce plaque adherence

147
Q

2Xyear F varnish tx in adolescents prevented proximal caries;

A

69%(high risk), 66% (medium risk), and 20% (low risk)

148
Q

F varnishes have __ % NaF

A

5

149
Q

F varnishes have __ ppm NaF

A

22,600

150
Q

How does F varnish work?

A

CaF globules are deposited and act as a reservoir for the slow release of F and Ca over time and under acid challenges

151
Q

Can F varnishes reveres and arrest active enamel lesions?

A

yes

152
Q

How are F gels applied?

A

custom-made trays

153
Q

F gels are made of:

A

1.23% acidulate P F or neutral 2% NaF

154
Q

T or F? Active whit elesions can be arrested with brushing alone.

A

T

155
Q

Sealing is only recommended on O surfaces if:

A

the surface is not being cleaned

156
Q

Sealants are indicated for adults and children who:

A

mod/high risk, active white spot lesions, existing pits and fissures that are susceptible to caries

157
Q

2 main types of pit and fissure sealants (P&FS)

A

resin-based sealant and composites and glass-ionomer cements

158
Q

T or F? Resin-based sealants contain F.

A

F. glass-ionomer cements do.

159
Q

T or F? On proximal and free, smooth area, caries proceed quickly.

A

F. slowly

160
Q

What must be done before applying the actual sealatn?

A

acid etching or conditioning

161
Q

T or F? Sealants are self-cleansing to prevent plaque accumulation.

A

T

162
Q

Advantages of sealants;

A

no irreversible intervention, active dentin lesions that are covered do not progress further, new lesions are prevented

163
Q

Disadvantages of resin composites:

A

shrink in polymerization, require isolation for proper bonding, less resistant to ear than ceramics, prone to chipping, do not bond well to dentin and root surfaces, don’t have antibacterial props

164
Q

__-__ % of anterior Class III and Class V resin comp resorts remain acceptable after 5 yrs.

A

60-80%

165
Q

Most common reasons for repair of ant resin comp resto

A

marginal staining, surface discoloration, secondary caries, edge chipping in high-stress areas, and/or fractures of the resto

166
Q

Varibales to why ant rests survive or not:

A

dr, location, size, age of pt, caries risk, bonding substrate

167
Q

4 components of resin composite;

A

polymer matrix, filler article, couling agent, and initiator system

168
Q

This is the continuous phase to which the other ingredietns are added:

A

matrix

169
Q

Does bis-GMA have a high or low viscosity?

A

high

170
Q

What is frequently added to bis-GMA to make it less viscous?

A

triethylene glycol dimethacrylate (TEGMA)

171
Q

T or F? Self-adhesive composites are now available.

A

T

172
Q

FIller particles are usually:

A

radiopaque glass, zirconium oxide, aluminum oxide, or silicon dioxide

173
Q

Benefits of adding filler:

A

improves translucency, reduces Co thermal exp, reduces poly shinkage, makes it stronger, harder, denser, and more resistant to wear

174
Q

t or F? In general, the lower the percentage of filler added, the better the physical props of the resin composite.

A

F. the greater the perc

175
Q

What are the filler particles coated with?

A

a coupling agent (organosilane)

176
Q

Why add coupling agent to the filler?

A

capable of production chemical bonding to the filler particles and the resin matrix, increase strength of the cohesive mass

177
Q

How are resin composites cured?

A

mix 2 components or expose a single component to a light

178
Q

What does the initiator, benzoyl peroxide, do to activate the rxn?

A

splits into 2 active free radicals when attached to the amine

179
Q

What does benzoyl peroxide initiate the polymerization of?

A

metacrylate molecules

180
Q

Most commonly used molecule for light cured composites:

A

camphorquinone

181
Q

When is photo initiation most efficient?

A

when an amine molecule is also unloaded in the formulation to act as a type of accelerator in the presence of he camphorquinone

182
Q

Disadvantages of resin composite:

A

shrikage (1.5% to 5), marginal defects, sensitivity, staining at margins, recurrent caries, nanoleakag at the resin-dentin interface

183
Q

Rigidity is aka:

A

gelation

184
Q

Recommendations to offset the shrinkage of resin composites:

A

incremental placement, long enamel bevels,low-shrinkage material, flexible resin liners, slow-setting resin-modified glass ionomer liners, and modified light-curing

185
Q

Benefit of unit dose resin comp.

A

fewer trapped air bubbles, infection control

186
Q

What are shrinkage stresses that occur in the early phase of polymerization relieved by?

A

deformation and flow of the material

187
Q

Where are the weakest bonds for resin comps:

A

dentin or cementum

188
Q

C-factor:

A

configuration factor, the ratio of bonded SA to the non bonded SA of the resto

189
Q

What influence the intensity of the stresses produced during polymerization?

A

The C-factor

190
Q

Do you want a high or low C factor to endure high shrinkage stress?

A

high

191
Q

Is the C factor favorable or unfavorable for most ant restos?

A

favorable

192
Q

Will high or low-stiffness material typically generate higher shrinkage stress?

A

high-stiffness

193
Q

How do the co of thermal expansion of resin comp and tooth structure compare?

A

resin is 2-6 times higher (expands and contracts more and at a greater rate)

194
Q

Classifications of resin comps based on viscosity:

A

conventional, packable, or flowable

195
Q

Disadvantage to low-viscosity resin comps:

A

tend to be sticky and tend to slump, risk of porosity inside the rest increases

196
Q

Are viscous resin comps sticky or not?

A

not

197
Q

T or F? Variations in the viscosity of a resin composite is always a reflection of the filler content.

A

F.

198
Q

Do low or high viscosity material generally have a lower filler load?

A

low-viscosity (seems backwards)

199
Q

What to avoid when using alcohol on your instrument while placing RC:

A

let it dry first so it doesn’t incorporate into the resin

200
Q

Recommendation when using very sticky materials

A

use wetting resin to lubricate instument

201
Q

What provides chroma in typical dentition?

A

dentin, as well as opacity, and fluorescence

202
Q

How does enamel effect the appearance of the tooth

A

it adds translucency and opalescence

203
Q

Microfilled resin composites contain:

A

silica filler of sub micron size

204
Q

Why can only low amounts of silica filler be added to composites?

A

very high SA and requires a large amount of monomer to wet the SA

205
Q

Are microfilled composites relatively strong or weak?

A

weak, so they add pre polymerized resin fillers to maximize the filler content

206
Q

Why is microfilmed resin composite so highly polishable?

A

bc each silica particle si only about 0.04 um in size

207
Q

Which composite can be polished best and have the smoothes surface?

A

microfilled

208
Q

Primary indication for microfilmed resin composite:

A

esthetic areas

209
Q

Are microfilmed resin composites indicated for stress-bearing restos?

A

no

210
Q

Do microfilmed resin composites absorb more or less water?

A

more

211
Q

Do microfilmed resin composites have an increased or decreased long-term color stability?

A

decreased

212
Q

Hybrid RCs are a combo of:

A

conventional and microilled technology

213
Q

Hybrid RCs are indicated for anterior/pos/both.

A

both

214
Q

What leads to resistance to internal discoloration for the Hybrid RCs?

A

high filler content

215
Q

Avg particle size of RCs:

A

less than 1um

216
Q

Many nano hybrids contain this to reduce overall curing shrinkage:

A

PPRF

217
Q

Properties of most nano filled comps:

A

nonsticky and nonslumping

218
Q

How do the amines differ bw chemically and light activated RCs?

A

chem- aromatic, light - -aliphatic

219
Q

Refractive index of tooth and composite;

A

1.5

220
Q

Most RCs on market are:

A

nanofills and hybrids (she says microfilled at another spot)

221
Q

IPS target for wear resistance:

A

10^-7

222
Q

nano is 10^-?

A

9

223
Q

The larger the filler particles, the greater the space bw them and therefore,

A

the more resin matrix available to create problems

224
Q

T or F? Class IV restorations should be done with microfill resin.

A

F. not good at stress bearing (use hybrid for stress bearing)

225
Q

Types of light curing units

A

Quartz/Tungsten/Halogen OR LED

226
Q

How often should you test your light curing unit?

A

every few months

227
Q

T or F? Intensity of the light and the necessary duration of exposure are always directly related.

A

F

228
Q

T or F? The darker the shade of the composite the longer it will take to polymerize.

A

T

229
Q

Issue if a partial sealant is lost:

A

pt is at higher risk of caries

230
Q

Which teeth retain sealants best?

A

man and premolars (vs molars)

231
Q

how to prep before the actual sealant is placed?

A

acid etch, then bonding agent (wets fissures)

232
Q

Adv/disadv of RMGI sealants:

A

good caries prevention, poor mechanical retention compared to resin

233
Q

When should RMGI sealants be considered?

A

when moisture contol is an issue

234
Q

T or F? Resin composite performs well as a sealant.

A

T

235
Q

PRR stands for:

A

preventative resin restoration

236
Q

PRRs are successful for up to:

A

10 yrs

237
Q

What % of sealants placed with PRRs are lost per year?

A

5-10%

238
Q

When is a PRR indicated?

A

when some areas of the fissure system of a tooth are associated with carious dentin and other are not, with a deep caries lesion when areas of the fissure system are not carious

239
Q

How can you reduce the viscosity of a RC?

A

heat it

240
Q

Are bevels required at eh occlusal margins of sealant preps?

A

no

241
Q

What type of restorative material should be used in dentin?

A

highly filled

242
Q

increments no greater than __mm should be used for RC

A

2

243
Q

T or F? An occlusal sealant can be placed over a resin composite.

A

T

244
Q

T or F? A pit or fissure can be open to dentin.

A

T

245
Q

When is a lesion likely active?

A

enamel surface is whitish/yellowish opaque and chalky, with loss of luster, rough when probed, in a plaque stagnation area

246
Q

plaque stagnation areas:

A

pit and fissures, near the gingiva, below the prox contact

247
Q

Leson likely to be arrested when:

A

surface of enamel is white, brown or black, enamel is shiny, fells hard and smooth when gently probed, lesion is located some distance from gingival margin

248
Q

Best way to remineralize pit and fissure noncavitated lesions:

A

sealant

249
Q

T or F? microcavitations can be sealed.

A

T

250
Q

Which is more preventative against carious lesions, fl varnish or sealant?

A

sealant (27% reduction vs 65%)

251
Q

Which teeth should be sealed?

A

cavitated lesions or teeth that are at risk

252
Q

Primary prevention w. sealant ex.:

A

seal a tooth before any caries form

253
Q

secondary prevention w. sealant ex.:

A

seal after a tooth has a lesion

254
Q

What is the only limiting factor for a sealant blocking bacteria and sugar and preventing caries progression?

A

the loss of the sealant

255
Q

T or F? Sealant stop progression of lesions.

A

F. sig reduce the progression

256
Q

When should sealants be placed?

A

early, non-cavitated carious lesions to prevent progression of the lesion

257
Q

types of sealants

A

resin (clear or opaque), flowable, (glass-ionomer)

258
Q

Why resin sealants are better than glass ionomer:

A

more effective, better retention rates

259
Q

Advantage of clear sealant:

A

you can see the underlying lesion

260
Q

What type of acid do we use to prep for sealant?

A

phosphoric

261
Q

T or F? Opaque resin composite requires an adhesive.

A

F. you can if you want

262
Q

PRR:

A

remove only carious portions and seal the rest

263
Q

bite registration paper is aka:

A

accufill

Direct Restoration (23 decks)

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