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fixed 2 > interum stuff > Flashcards

interum stuff Flashcards

1
Q

what are Acrylics

A

Monomethacrylates

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2
Q

examples of Acrylics

A 
Polymethyl methacrylate (Jet, Duralay)
Polyethyl methacrylate (trim, snap_
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3
Q

what are Bisacryls

A

Dimethacrylates

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4
Q

examples of Bisacrylcs

A 
BisGMA (provisa, Protemp)
Urethane Dimethacrylate (Luxatemp)
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5
Q

use of Monomethacrylates

A

Provisions
Old styles custom trays
Dentures, RPD bases
Low end denture teeth (high end are interpenetated networks with crosslinking)

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6
Q

speed of Acrylic polymerization

A

FAst (generates lots of heat)

-1,000,000 units a second

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7
Q

difference chemically of Jet and trim

A

jet has a methyl group hanging off the ether

Trim has an ethyl group hanigng of the ether

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8
Q

Monomethacrylates for what type of chain

A

Linear chain

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9
Q

characteristics of Monomethacrylates

A

Tough

Soft

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10
Q

what type of chain do dimethacrylates create

A

Crnach and crosslinked

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11
Q

characteristics of Dimethacrelates

A

Brittle

Hard

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12
Q

what materials create linear chain

A

Jet and trim

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13
Q

what materials create branch and crosslinking

A

BisAcryl

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14
Q

how is the change in density realized for Polymer formation

A

Through shrinkage

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15
Q

what is done to reduce shrinkage

A

Adding fillers

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16
Q

what is in the liquid of acrylics

A

Monomers
Inhibitors
Chemical initiators (amine)

17
Q

what is in the powder of acrylics

A

Polymer beads
Colorants
Chemical initiators (BPO)

18
Q

what dictates the reason why you cannot mix systems

A

The initiator system (BPO and Amine need to mix correctly)

19
Q

what are Bisacryls based on

A

based on Composite tech or Dimethacrylates

20
Q

how do Bisacryls work

A

Flowable like composite

21
Q

what makes up the Dimethacrylate of Bisacryls

A

High molecular weight monomers (oligomers
Silica fillers
reduced shrinkage

22
Q

PRos of Bisacryls

A 
Good surface hardness
Good transverse strength
Easy to use
Low exothermic
Low shrinkage
Good margin fit
Good abrasion resitnace
Minimal pulpal iritation
good translucency and appearance
resist stain
better color stability
23
Q

cons of Bisacryl

A

Limited shades (layer with composite
Expensive
brittle (fracture when thin)
alteration and repair difficult

24
Q

what are the ideal properites of interum material

A 
Convenient handling (working time, rapid set time, easy modling)
Biocompatibility
Dimensional stability during set
East of contour and polish
Adequate strength
Appearance 
Ease of repair

fixed 2 (8 decks)

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