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

Midterm Review Flashcards by Annabella Moody

Palodent should be placed:

1mm above margin of adjacent tooth

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What does a cure through matrix do?

Acheives best contours

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When do you re-etch?

if contamimated
if it doesn’t appear etched

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How much do you break the facial contact in a class III?

.25 mm (to allow for matrix band & 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 lightcuring?

Smaller tip = increased heat & output

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Elastic modulous 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 _____

activator; blue light

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What would you recommend to a patient with sensitivity?

Toothpaste with KNO3 (maybe glumma)

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

True (on the 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 the box:

To improve gingival margin seal

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

Do NOT bevel lingual margin? maybe sandpaper strips

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Main reason for etching:

Increase SA and surface energy

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Purpose of beveling the gingival margin:

Exposes enamel rods

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What could result from composite sticking to tool?

void

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Order from softest to hardest:

Cemuntum –> dentin –> enamel

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Increasing the filler in composite leads to:

increasing strength & decreased shrinkage

Most esthetic for Class III & Class IV:

Microfill (hybrid)

What needs to be done prior to putting on rubber dam?

Check shade selection

What teeth do you isolate with rubber dam?

one tooth posterior & two teeth anterior

When you have two adjacent preps, you should:

Prep largest first, but restore the smallest first

Incremental layers of composite creates:

Less stress

Improper wedging can result in:

Gingival inflammatio

What restoration error would result in gingival irritation?

Overcontoured restoration

What is the reason to choose composite over amalgam:

esthetics

Why do you want a good path of entry:

Bonding will be better (may direction of enamel rods)

What should you consider when choosing between amalgam & composite?

1. diet 2. placement of caries 3. ability to isolate (NOT family history of MS)

Dentin adhesive bonding can best be described as:

Collagen & 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 amalgam & composite except:

Final occlusal position

Patient has a DO 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 / unbonded surfaces

C factor

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

Mandibular first premolar #28 (you need a slanted prep here)

Adhesive solvent that we use at UMKC:

Ethanol

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

Micromechanical; micromechanical; chemical

Collagen & resin from intertubular dentin:

Hybrid layer

Abfraction primarily effects what portion of the tooth:

Cervical

Tooth flexing & bending:

Abfraction

Is bonding agent hydrophilic or hydrophobic?

Hydrophobic

Where is retention groove in a class V prep placed?

Occlusal-axial angle

Where is prismless enamel found?

Cervical

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

1. sectional matrix 2. pre-wedge

Where do you bevel for a class II?

1. axiopulpal line angle 2. gingival 3. lingual

What leads to the most post-op sensativity

Bulk fill

Why do you flare on the cavosurface?

To expose 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 fill

All of the following are indications for composite except:

heavy occlusion on the contact

Adhesive _____ in the presence of water

separates

Instead of beveling in dentin you have a:

90 degree butt margin

One key difference between composite and amalgam is:

Bevel gingival floor

What is a reason we do not use Eugonol?

Inhibits polymerization (also BHT)

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

Self-etch primer

Self-etch systems contain:

Acid in primer

T/F: If prep is deeper/closer to the pulp, you place retention grooves 1mm farther axially

False

Strength for bonding comes from:

Collagen in intertubular dentin

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

False

Wider dentin tubules are near:

The pulp

Erosion is caused by:

Chemicals (example lemons)

When doing a class III preparation make sure you preserve the:

Incisal contact

What is hybrid layer?

Resin with collagen (maybe resin with filler)

Where does decay expand rapidly?

DEH

Where does adhesive bond best?

Intertubular dentin

Where do you put a retention groove in a class III?

Gingival wall

Results in collapse of collagen layer and reduced bond strength:

Dessicating dentin

Which is NOT true about beveling?

Removes layer of fluoride rich dentin

Opaque composite requires ______ curing times

Longer (we need for class III so light doesn't shine through)

Which of the following has the highest flexural strength?

Hybrid

If adhesive bond strength is less than polymerization bond strength:

Restoration will debond

Component of resin matrix?

Bis-GMA

Which fill has the best wear resistance?

Microfill

What is true about class IV restorations?

You should extend the composite past the enamel bevel

Which liner do you use if your class II prep goes 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

Midterm Review Flashcards

(89 cards)