pretty lecture lady Flashcards

1
Q

most used restorative material (direct or indirect restorations)

A

composite resins

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2
Q
A
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3
Q

3 resin matrix

A

bis-GMA
UDMA
TEGDMA

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4
Q

high molecular weight???

A

bis-gma

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5
Q
A
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6
Q
A
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7
Q

increase the mechanical and physical property

A

filler particles (reinforcement of resin matrix

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8
Q
A
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9
Q
A
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10
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11
Q
A
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12
Q

in composites, monomers to be coverted into:

this process is triggered by:

A

polymers

free radicals

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13
Q
A
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14
Q
A
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15
Q

classification of composites:

A
  1. filler particle size and size distribution (hybrid and nano*)
  2. handling characteristics
  3. type of polymerization
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16
Q

classification by handling characteristic :
1
2
3

A
  1. regular (many applications; versatile, layering tech., more esthetic
  2. flowable (better flowability and adaptation, polymerization shrinkage, under regular comp. class II)
  3. bulk fill
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17
Q

developed to enable restoration in single increment built up to 4-5mm

A

bulk fill composite

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18
Q

characteristics of bulk fill composites

A
  1. increased depth of cure (polymerization)
  2. reduce polymerization shrinkage stress
  3. improved adaptation to the surface of the cavity
  4. simplified placement tech.
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19
Q

~~~~how do bulk fill composites achieve these characteristics?

A
  1. modulating the polymerization reaction= relieving shrinkage stress
  2. depth of cure (polymerization)
  3. flowability and adaptation to the surfaces of the cavity
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20
Q

bulk filler composites filler particles:

A

-lower amount of filler particles
-pre-polymerized filler particles
-low elastic modulus= help absorb stresses
-added larger filler size particles

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21
Q

what kind of monomers do bulk filler composites used

A
  1. UDMA
    -modified UDMA (adding aromatic groups)
    -fragmentation dimethacrylate monomers
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22
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A
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23
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26
Q

bulk fill composites use what type of monomers??

A

(typical polymerization of methacrylate)

-fragmentation monomers(stress relieving monomers)

27
Q

bulk fill composites also utilized alternative photoinit

A
28
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29
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30
Q

bulk fill composites can be categorized into two categories/types

A
  1. flowable bulk fill
  2. full body bulk fill
31
Q

this category of bulk fill composite has lower elastic modulus and reduced wear resistance
-base for regular composites as the occlusal increment
-dent replacement only
-better adaptation on the surfaces of the cavity

A

flowable bulk fill

32
Q

this category of bulk fill composite has

A
33
Q

with bulk fill flow, leave how much space to add regular composite towards occlusal?

A

~2mm

34
Q

this type of bulk fill has rheological modifiers that react to the sonic energy applied during placement (sonic vibration=becomes flowable composite)

A

sonic activated bulk flow

35
Q

what does the sonic application do

A

reduce viscosity =

36
Q
A
37
Q

this bulk flow system

A
38
Q

essential steps for esthetic appearance (match with the surrounding tooth structure) and functionality

A

finishing and polishing

39
Q

polished and finishing decreases the coefficient of friction which

A

reduced the rate of wear

40
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43
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44
Q

advantages of bulk fill composite

A

-simple
-less chair time
-better flowability
-***reduced polymerization and shrinkage

45
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46
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46
Q

disadvantages of bulk fill

A

-more translucent that regular
-indicated for posterior restorations
-cannot mimic natural layering of tooth

47
Q
A
47
Q

acid-base, self-adhesive materials, combining fluro-aluminosilicate glass powder and polyacrylic

A
48
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49
Q
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50
Q

basic composition of powder (glass)

A
51
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52
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53
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54
Q
A