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Operative 1 > Class 2 Prep > Flashcards

Class 2 Prep Flashcards

1
Q
A

know this

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2
Q

ADA Caries Classification

  • No clinically detectable lesion
  • normal in color
A

Sound
IDCAS 0

she stated last semester we do not document this in clinic

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3
Q

ADA Caries Classification

  • mild demineralization (c / d)
  • dectable only after drying (mild)
  • enamel lost gloss
A
  • Inital
  • IDCAS 1 and 2
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4
Q

ADA Caries Classification

  • visable enamel breakdown
  • dentin partailly demineralized
A

*moderate
* IDCAS 3 and 4

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5
Q

ADA Caries Classification

  • enamel fully caviated
  • dentin exposed
  • deep
A

*advanced
* IDCAS 5 and 6

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6
Q

initial caries

A

entirly in enamel

in-amel

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7
Q

morderate caries

A

lesion enter in denitn

moDerate
Denin

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8
Q

advanced caries

A

well into dentin, approaching pulp

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9
Q

root caries

A

lesion entering denitn

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10
Q

interpromiximal caries

A

caries attack gingival to the contact area

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11
Q

what are the dentist’s goal for interproximal caries

A
  • remove caries
  • remove least amount of tooth
  • prep tooth
  • resist fracture
  • retain restoration
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12
Q

for a class 2 amalgam prep you have a

A
  • reverse S curve
  • exit angle is 90 degrees
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13
Q

What way do we want to prepare the tooth?

A
  • to resist fracture
  • retains the restoration
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14
Q

lingual wall of box is at a

A

90 degree to cavosurface

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15
Q

axiopulpal line angel bevel is

A

45 degrees

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16
Q

in a class two prep the axial wall is

A

CONVEX

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17
Q

reverse- ____ curve

A

S

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18
Q

buccal wall of box is

A

90 degrees cavosurface

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19
Q

in a class 2 prep the buccal wall converegence is

A

3-4 degrees

/ \

20
Q

in a class 2 prep the lingual wall convergence is

A

3-4 degrees

21
Q

Reverse S curve is nearly alway on the

A

buccal side

22
Q

the reverse s curve allows the prep

A

break contact while allowing the the buccal wall to meet the tooth surface at a 90 degree angle

23
Q

class 2 is where _____ form comes into play

A

convenience form

24
Q

for class 2 Buccal contact is open

A

0.2 to 0.5mm

25
Q

gingival contact is open at least

A

0.5mm

26
Q

lingual contact is open

A

0.2 to 0.5mm

27
Q

having the gingival contact open at least 0.5mm this

A

ensures the etched, caries-suspcetible area bleow the contact area

28
Q

what are the steps to the class 2 prep?

A
  1. do a class 1 prep
  2. widen the dovetail facialingually
  3. ditch for the box
  4. break through the enamel wall
  5. remove underminded enamal hooks
  6. smooth the gingival floor
  7. bevel the axiopulpal
  8. remove undermined from gingival margin
  9. smooth walls
  10. place rentention grooves
29
Q

widen the the dovetail to 0.5 to 0.8 then

A

ditch out the box

30
Q

mandibular first premoler is tilted more

A

lingually

enter parallel to the long axis of the tooth CROWN

31
Q

common error of class 2 amalgam prep

A
  • undermined enamel
  • incorrect axis of entry
  • incorrect S curve
  • retention groove misplaced
  • concave axial wall
32
Q

use enamel hatchet with the blade ________ to the surface of the tooth

A

perpendicular

33
Q

you want a _____ axial wall

A

flat or convex

34
Q

the purpose of retention grooves in class two prep

A

To retain the amalgam segment that fills the box against INTERPROXIMAL displacement

35
Q

composite vs amlagam

A
  • bonding
  • prep can be more conservative
  • is a good insulator
36
Q

composite was first used in the posterior in

A

1960

37
Q

amalgam ____ composite

A

greater than (>)

38
Q

indication for composite

A
  • esthetics
  • light occlusal contacts
  • smaller restorations
  • isolation
39
Q

Light occlusal contacts must have ____________ occlusion on marginal ridges and cups tips

A

tooth supported

40
Q

composite does not support

A

occlusion

41
Q

Not indications for composites

A
  • mercury fear
  • ALS and MS patients
42
Q

Possible Indications for Composite (special)

A

◦ Crown foundation
◦ “Buildup” material
◦ Very large restorations
◦ Conservative or Preventative restorations
◦ Temperature sensitivity with metal restorations
◦ Cross reaction between nickel allergy and silver (RARE)

43
Q

Contraindications to Composite

A
  • heavy occlusal forces
  • occlusal contacts entirely on composite
  • extend to root surface
  • deep subgingival margins
  • diet
  • poor hygiene
  • unable to isolate
44
Q

why do composites fail?

A
  • dentin tubles
  • adhesives
  • etch (operator error)
  • shrinkage
45
Q

composite preps are _______ but restoration is NOT

A

forgiving

46
Q

with composite we must

A

ISOLATE

preparation AND restoration

47
Q

Disadvantages of composites

A
  • Low modulus of elasticity
  • Porous
  • More technique sensitive placement
  • More time-consuming placement
  • Microleakage
  • May stick to instrument, resulting in voids
  • Can’t place in bulk
  • Expensive compared to amalgam

Operative 1 (15 decks)

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