1. if contaminated 2. if it doesn't appear etched

Midterm Review Flashcards by Abagayle Moody

Palodent should be placed:

1 mm above the margin of adjacent tooth

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What does a cure thru matrix do?

achieves the best contours

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When to re-etch?

if contaminated
if it doesn’t appear etched

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How much should you break the facial contact for class III?

0.25 mm (to allow for matrix band and good esthetics)

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What type of composites are used at UMKC?

nanohybrids

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What is NOT true about an S-curve?

makes walls diverge

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What do the methacrylate monomers in bulk fill do?

relieve stress

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What do you use for a class III?

mylar strips

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What is true about the smaller tip when light curing?

smaller tip = increased heat and output

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Elastic modulus also means?

stiffness

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Couples filler with resin (coupling agent)

silane

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axiopulpal line angle is ____ in amalgam to improve

beveled; resistance

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Camforquinone is a _____ and is activated by:

initiator; blue light

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What would you recommend for a patient with sensitivity?

tooth paste with KNO3 (maybe glumma too)

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T/F it is okay to leave unsupported enamel in a class III prep:

true (facial wall)

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Order of composite restoration:

etch
bond
fill
finish
polish

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Reason for box only prep?

to conserve tooth structure

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What class has the highest c-factor?

class I > class II > class III

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Reason for doing flowable at the bottom of a box?

to improve gingival margin seal

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What should you do if you have heavy contact on the lingual of a class III or class IV?

do not bevel lingual margin? Maybe sandpaper strips after too)

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Main reason for etching is:

increase surface area and surface energy

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Purpose of beveling gingival margin:

exposes enamel rods

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What could result from composite sticking to a tool?

void

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Order from softest to hardest:

cementum then dentin then enamel (hardest)

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Increasing the filler in composite leads to:

1. increased strength 2. decreased shrinkage

Most esthetic for class III and class IV:

microfill (hybrid)

What do you do before putting on a rubber dam?

shade selection

What teeth do you isolate with rubber dam?

one tooth posterior and two teeth anterior

When you have two adjacent preps you should

prep the largest first, and then restore the smallest first

Incremental layers of composite creates:

less stress

Improper wedging can result in:

gingival inflammation

What restoration error would result in gingival irritation?

over contoured restoration

What is the reason to choose composite over amalgam?

patient wanting a tooth colored filling

Why do you want a good path of entry?

bonding will be better (maybe due to direction of enamel rods)

What should you consider when choosing between amalgam and composite?

1. diet 2. placement of caries 3. ability to isolate (Family history of MS is not a consideration)

Dentin adhesive bonding can best be described as:

collagen and resin interlocked intertubular dentin (hybrid layer)

Should the smear layer be removed?

yes

Palodent is best used for:

small class II composite

All of the following are differences between composite and amalgam except:

final occlusal position

Pt has a DO done on #4, and now has cold sensitivity and inflamed gums, what is likely the cause?

fluid in dentinal tubules

Lower polymerization shrinkage means lower:

c factor

bonded surfaces divided by unbonded surfaces =

c bond

In what tooth are you most likely to expose the pulp by going in with the long axis of the tooth?

mandibular first pre molar #28 (need a slanted prep)

Adhesive solvent that we use at UMKC:

Ethanol

Bonding agent ___ bonds to enamel. Bonding agent ____ bonds to dentin. Bonding agent ___ bonds to resin

micro mechanical micro mechanical chemical

collagen and resin from intertubular dentin:

hybrid layer

Tooth flexing and bending:

abfraction

Abraction primarily affects what portion of the tooth:

cervical

Is bonding agent hydrophilic or hydrophobic?

hydrophobic

Where is retention groove in class V prep placed?

occlusal axial angle

Prismless enamel is found:

cervical

What will prevent you from having a good contact in class II?

1. sectional matrix 2. pre-wedge

Where do you bevel for a class II?

1. axiopulpal line angle 2. gingival 3. lingual wall

What leads to the most post-op sensitivity?

bulk fill

Why do you flare on the Cavosurface?

to expose the ends of the enamel rods

Why is it harder to bond to dentin than enamel?

dentin is more heterogenous

T/F You bevel to expose the SIDES of enamel rods:

false

Longevity of the tooth is also known as:

fracture toughness

Root surface caries are more commonly found on:

gingival to the contact

All of the following are reasons we have failure at the gingival portion of the box EXCEPT:

incremental fills instead of bulk

All of the following are indications of composite EXCEPT:

heavy occlusion on the contact

Adhesive ___ in the present of water

separates

Instead of beveling in dentin you:

90 degree butt margin

Key difference in composite and amalgam is:

bevel gingival floor

Why do we not use eugenol?

inhibits polymerization (also BHT)

not strong enough to etch enamel, only partially removes smear layer:

self-etching primer

Self etch systems contain

acid in the primer

T/F: if prep is deeper/closer to the pulp you place retention groove 1 mm farther axially:

false

Strength for bonding comes from :

collagen in intertubular dentin

T//F: You must put bonding in between every increment of composite:

false

Wider dentin tubules are near the:

pulp

Erosin is caused by:

chemicals (like lemons)

When doing a class III make sure you preserve the:

incisal contact

What is hybrid?

resin with collagen (or maybe its filler)

Where does decay expand rapidly?

DEJ

Where does adhesive bond best?

intertubular dentin

Where do you put retention groove in a class III?

gingival wall

Results in collapse of collage layer and reduced bond strength:

desiccating dentin

Which is not true about beveling?

removes layer of fluoride rich dentin

Opaque composite requires:

longer curing times (need for class II so light doesn't shine through)

Which of the following has the highest flexural strength?

hybrid

If adhesive bond strength is less than polymerization strength:

restoration will debond

Component of resin matrix is

Bis GMA

Which fill has the best wear resistance?

microfill

What is true about class IV restorations?

you should extend composite past the enamel bevel

Which liner do you use if your class II went too deep?

CaOH (dycal)

On a class III, caries occur:

below the contact

Which of the following determines the success of a class II restoration?

good isolation