Quiz 1B Flashcards Preview

Dental Materials > Quiz 1B > Flashcards

Flashcards in Quiz 1B Deck (25)
Loading flashcards...
1
Q

Layer of debris (organic and inorganic material) that forms onto the enamel and dentin when prepared with rotary instruments?

A

smear layer

2
Q

Layer a few microns thick and weakly adheres to the substrate; also lowers the surface energy?

A

smear layer

3
Q

What must be removed or penetrated by the adhesive (usually by acid etching)?

A

smear layer

4
Q

What is a strong acid solution, such as phosphoric acid solutions and gels 35-37%, that is also called conditioners?

A

etchants

5
Q

Hydrophilic monomers to produce good wetting that is usually carried in a solvent (acetone, ethanol, water)?

A

primers

6
Q

What component of the material of the bonding system is HEMA found in?

A

primer

7
Q

What does the HEMA molecule look like?

A

has hydrophilic & hydrophobic end

8
Q

Hydrophobic, dimethacrylate oligomers compatible with the primer and composite monomers (primary sources of color)?

A

adhesives

9
Q

What are light cured, an activator like camphoroquinone and organic amine, or dual-cured catalyst for self curing?

A

initiators and accelerators

10
Q

What gives bonding agents a higher bonding strength?

A

fillers

11
Q

What are some other ingredients in the composition of bonding materials?

A

fluoride, antimicrobials (gluteraldehyde)

12
Q

What occurs after etching primarily by micro-mechanical retention removing the smear layer HA crystals by dissolution?

A

enamel bonding

13
Q

What indicates macro-spaces formed after enamel bonding?

A

frosty appearance

14
Q

What forms by etching with phosphoric acid gel to aid enamel bonding?

A

macro and micro tags

15
Q

What is more numerous and contributes most to micro-mechanical retention?

A

micro tags

16
Q

What flows in the micro/macro tags (micropores) irregularities?

A

primer and adhesive

17
Q

What forms the resin tags when cured?

A

primer and adhesive

18
Q

What are the three procedures of dentin bonding?

A

1) Etching
2) Priming
3) Bonding

19
Q

What does etching do?

A

removes smear layer
removes HA from outer dentin layer
exposes collagen sponge layer
exposes dentin tubules

20
Q

Why must care be taken after etching to prevent drying?

A

to keep dentin surface and collagen layer from collapsing on itself, thus preventing penetration by the primer, thus bonding will fail

21
Q

The primer forms what layer?

A

hybrid layer

22
Q

The process of impregnation of the etched dentin by the resin in the primer?

A

the hybrid layer formation

23
Q

If the hybrid layer fails to fully impregnate with primer, what happens?

A

space creates mechanically weak zone

24
Q

Primers have solvents that do what?

A

enhance wetting

carry the monomers into the tags

25
Q

To ensure to carry the monomers deep as the solvent evaporates, what can we do?

A

apply several layers of the primer