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Operative 1 > Class 1 and class 5 preps > Flashcards

Class 1 and class 5 preps Flashcards

1
Q

For alamagam restoration what are means for isolation of the site?

A
  • visbility
  • access
  • mositure contol (very important with compositte
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2
Q

what is the gold standard for isolation?

A

rubber dam

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3
Q

what are other things that can be used for isolation?

A
  • retraction cord
  • cotton rolls
  • isovac
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4
Q

All ________ must be removed

A

undermined enamel

```from all margins

```

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5
Q

Margins should be ____________ at the
cavosurface on all axial surfaces

A

90 degrees

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6
Q

On the occlusal surface, margins may be
SLIGHTLY obtuse in some areas, but must
_________________ anywhere on the tooth

A

NEVER BE ACUTE

enamel would break

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7
Q

Ideal preparations are ________
into the dentin

A

0.2mm to 0.5 mm

in live pt determined by caries

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8
Q

RETENTION FORM

A

what holds a restoration in a
tooth (RETAINS the restoration)

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9
Q

Amalgam doesn’t

A

bond to the tooth

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10
Q

Smaller amalgams are held in by

A

converging walls
and/or
by retention grooves if no walls
can converge

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11
Q

RESISTANCE FORM
These are elements in the design of a tooth preparation that will help

A

restoration and tooth resist fracturing

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12
Q

What makes the tooth less likely to fracture?

A

-maintaining as much tooth structure as possible
-Rounding internal line angles on a preparation

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13
Q

what makes the restoration less likely to fracture?

A

-Having some areas on the floor of a multi-surface preparation that are perpendicular to occlusal forces
-Smoothly rounding outline forms
-proper depth

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14
Q

Never leave enamel on the

A

floor of an amalgam preparation

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15
Q

NEVER leave a partial-depth ledge on the

A

enamel wall of an occlusal
preparation, like a class I amalgam

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16
Q

Where do class ones occur

A

in the occlsual 2/3 of molar

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17
Q

what is this pointing to?

A

pupal floor

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18
Q

what is this pointing to?

A

isthmus

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19
Q

what is th top arrow pointing to?

A

buccal groove extension

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20
Q

what is the bottom arrow point to?

A

lingual groove extension

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21
Q

what is this pointing to?

A

dove tails

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22
Q

the buccal and lingual walls of the isthmus in the prep are

A

converged

/ \

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23
Q

the distal and mesial wall of the prep are

A

diverged

\ /

24
Q

the wall at the terminal ends of the buccal and lingual grooves diverge _______

A

3 degrees

25
Q

walls of the ithmus converge

A

3 degress

26
Q

what is the width of the isthmus

A

1mm

27
Q

divergeing the mesial and distal wall adjacent to the marginal ridge

A

leaves dentin support for the ridge area

28
Q

what is the wrong approach to the marginal ridge (prep)

A

converging it

29
Q

what are other common mistakes of preps?

A

*off axis
* converge where is should diverge
* wall diverges too much

30
Q

how can you avoid being off axis?

A

eneter teeth parallel to the long axis of the TOOTH CROWN not the patient

31
Q

bur inclines more mesal in the ________ as you move posterior

A

mandible

32
Q

bur incline more distally in the ________ as you move posterior

A

maxilla

33
Q

BUR INCLINES MORE MESIALLY IN
THE MANDIBLE AND MORE DISTALLY
IN THE MAXILLA THE FURTHER
POSTERIORLY WE GO, DUE TO THE

A

Curve of Spee

34
Q

BUR INCLINES MORE LIGUALLY IN
THE MANDIBLE AND MORE
BUCCALLY IN THE MAXILLA THE
MORE POSTERIORLY WE GO, DUE
TO THE

A

Curve of Wilson

35
Q

bur incline more lingual in the ________ as you move posterior

A

mandblie

36
Q

bur incline more buccally in the ________ as you move posterior

A

maxilla

37
Q

a prep is too shallow if it is

A

still in the enamel

38
Q

prep is too deep when

A

too close to the pulp

weakens the tooth

39
Q

what is wrong with this prep?

A

there is a ledge in the wall

40
Q

A 169 bus is a

A

tapered fissure bur

41
Q

what bur is this?

A

169

42
Q

what bur is this?

A

245

43
Q

if you hold the 245 bur in one plane it will

A

cut an undercut with rounded internal angles

44
Q

Class 5 restore carious lesion on the

A

gingival 3rd of the buccal and lingual surfaces

45
Q

Enamel in the cervical area are

A

thinner

prep is not as deep as on occlussal

46
Q

on class 5 what determines the outline of the prep?

A

the extent of caries

not the anatomy

47
Q

on the class 5 all walls

A

DIVERGE

48
Q

when is the axial wall of a class 5 prep convex?

A

caries is minimal

49
Q

what is the blue pointing to?

A

occlusal-axial retention groove

50
Q

what is the red arrow pointing to

A

gingival-axial retention groove

51
Q

The entire _____________ of the
enamel is _____________ to
the cavosurface and is still
supported internally by
dentin.

A

thickness; perpendicular

52
Q

Make sure that the depth is ________ in a class five

A

convex

53
Q

rention grooves are always in

A

dentin, just inside D-E junction

54
Q

what bur do you use to place a rention groove?

A

1/4 bur

55
Q

if you are unable to reach interproximal

A

you can use a
* #2 round bur
* gingival margin trimmer
* 169 bur

56
Q

on class 5 make sure teh axial depth i s

A

even and follow convex

57
Q

where are rention grooves placed in a class 5 prep?

A

inside the D-E junction

Operative 1 (15 decks)

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