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Dental Materials > Module 2 > Flashcards

Module 2 Flashcards

1
Q

Micro-leakage causes?

A

hypersensitivity of the tooth

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2
Q

What material is replacing base materials because it eliminates micro-leakage?

A

bonding material

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3
Q

Base materials are used on _____ preps?

A

deep

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4
Q

Base materials can help absorb ______ forces?

A

bitting

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5
Q

What dental cements can be used as bases?

A

ANY

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6
Q

What base material is similar to ZOE but is stronger and has less effect on the pulp?

A

EBA (ethoxybenzoic)

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7
Q

What is the OLDEST type of cement that had to be mixed on a cool glass slab?

A

Zinc Phosphate

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8
Q

What are the two components of Zinc Phosphate cements?

A

Zinc oxide powder

Phosphoric acid liquid

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9
Q

What base is acidic but the Ph rises with time?

A

Polycarboxylate

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10
Q

Polycarboxylate can be used under _______ restorations?

A

all

but mostly under amalgams

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11
Q

What cement/base material REVOLUTIONIZED dentistry?

A

Glass Ionomer

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12
Q

Glass Ionomer can bond to ________ and releases ______.

A

enamel/other polymer materials

fluoride

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13
Q

Glass Ionomer has what type of curing method?

A

dual (light/chemical)

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14
Q

Due to the bonding abilities of glass ionomer _____ ____ is eliminated?

A

micro-leakage/sensitivity

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15
Q

______ cement/base is used when a restoration is temporary and helps to sedate the pulp?

A

ZOE

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16
Q

What material is used MOST often as a Intermediary Base material in DEEP preparations due to its ability to stimulate reparative dentin?

A

Calcium Hydroxide

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17
Q

What material is used to seal cut dentinal tubules?

18
Q

________ of amalgam fillings caused self-sealing of micro-leakage?

19
Q

Calcium Hydroxide has a _____ pH?

20
Q

One downfall with Calcium Hydroxide?

A

dissolves easily in oral fluids (weakens tooth)

21
Q

As calcium hydroxide dissolves it ____ the pH and _____ bacterial growth?

A

increases

decreases

22
Q

Calcium Hydroxide has what type of curing method?

23
Q

What is the purpose of a dental liner?

A

reduce acidity
stimulate pulp
acts as a bonding material

24
Q

What is the purpose of a base?

A

absorb biting forces

insulate pulp from temp changes

25
Q

What is an Esthetic Direct Restorative Material?

A

Composte fillings

26
Q

A blend of glass ionomer and composite materials is termed a?

27
Q

a blend that has more glass ionomer than composite is termed a?

A

polyacid modified glass ionomer

28
Q

PMMA stands for?

A

polymethyl/polymethacrylate

29
Q

Direct restorations are made?

A

in house (placed chairside)

30
Q

What type of cross-linked polymer resin is most popular in dentistry?

A

Dimethacrylate

31
Q

Dimethacrylate resin is a reaction between_______ and _______

A

bisphenol-A

glycidyl methacrylate

32
Q

Dimethacrylates are preferred due to increased ____ and _______ strength and a lower _____ _____

A

stiffness
compressive
water absorption

33
Q

Bis-GMA has ____ molecules thus having less _______

A

large

shrinkage

34
Q

What type of Dimethacrylate is used most often?

35
Q

Composite filler particles can be a combination of what materials?

A

Silicates (Quartz)
Barium/Strontium/Zinc
Silane

36
Q

What is the function of Barium/Strontium/Zinc in the composite filler material?

A

Radiopaque material to facilitate diagnosis

37
Q

What is the function of Silane in the composite filler material?

A

Bonds matrix to filler

38
Q

Filler Size:
Macro =
Midfill =
Micro =

A

10-20 microns
.1- 10 microns
.01- .1 microns

39
Q

What type of composite filler size is best?

A

hybrid of sizes

40
Q

What is the smear layer?

A

enamel and dentin debris from the drill

41
Q

How do you remove the smear layer?

Dental Materials (3 decks)

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