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Anatomy > Operative > Flashcards

Operative Flashcards

1
Q

What base was used in lab

A

glass ionomer

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2
Q

3 functions of bases and liners

A

Pulpal protection
controls inflammation
mechanical barrier

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3
Q

3 purposes of dental wedges

A

1) clear space for matrix band
2) prevents overhangs
3) maintains proper margin

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4
Q

What is the 2-2-2-2 rule

A
  • 2 mm pin hole depth
  • 2 drill diameters inside DEJ
  • 2 mm length of pin
  • 2 mm amalgam over pin
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5
Q

When is it necessary to place a pin

A

when a cusp has been compromised.
-When facial or lingual extension exceeds 2/3 the distance from a primary groove towards the cusp tip.

-When facial-lingual extension of the occlusal preparation exceeds 2/3 the distance between faciolingual cusps

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6
Q

Where should pin be placed

A

at the line angles of missing cusps, 2 mm past DEJ

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7
Q

How many pins should be placed

A

one per missing cusp

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8
Q

What kind of pins do we use?

A

Threaded pins, self-shearing. Minim silver .021/.53 drill. .024/.61 pin

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9
Q

What size pin drill did we use

A

.021/.53

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10
Q

What size pin did we use

A

.024/.61

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11
Q

How should the pin drill be oriented

A

parallel with the root surface

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12
Q

how long do you triturate

A

7 seconds

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13
Q

Condensing time

A

5 mins

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14
Q

Carving time

A

7 mins

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15
Q

3 functions of matrix band

A

isolation
contain amalgam
proximal contact

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16
Q

What should you do if you find caries under cusp

A

extend prep buccally and pulpally until no caries left. Use base, liner, and CaOH. Restore.

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17
Q

Indirect pulp cap is used when

A

within .5 mm of pulp

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18
Q

function of CaOH

A

form reparative dentin

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19
Q

Most commonly used bases

A

GI and RMGI

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20
Q

Dentin conditioner

A

polyacrylic acid

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21
Q

Liner not compatible with composite

A

ZOE
B&T

They inhibit polymerization

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22
Q

Function of dentin conditioner

A

clean smear layer

leave smear plug

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23
Q

Outline

A

placing cavity margins in positions that they will occupy in final prep

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24
Q

Initial depth

A

0.2 to 0.8 mm pulpally from the DEJ (usually 0.5mm) - Ideal Pulpal Depth is 0.5 mm past the DEJ and Ideal Axial Depth is 0.5-0.75 past the DEJ, but must
be 1 mm to be able to properly condense

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25
Q

Resistance form

A

That shape and placement of the cavity walls that best enable both the restoration and the tooth to withstand, without fracture, masticatory forces
delivered in the long axis of the tooth

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26
Q

Retention form

A

That shape or form of the prepared cavity that resists displacement or removal of the restoration from tipping or lifting forces
-Retentive features include: Converging walls, retentive grooves on the
axiobuccal and axiolingual line angles of the proximal box

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27
Q

Convenience form

A

That shape or form of the cavity that provides for adequate observation, accessibility, and ease of operation in preparing and restoring of the
cavity

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28
Q

Amalgam brand

A

Permite C

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29
Q

Amalgam company

A

SDI

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30
Q

Amalgam type

A

admixed (lathe cut and spherical particles)

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31
Q

What cap is extended carving time? What’s regular?

A

Green, grey

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32
Q

Color of amalgam plunger indicates

A

spill size (purple - 2 spill 600 mg)

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33
Q

Low copper amalgam allows for

A

gamma 2 phase to form. Most corrosion prone

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34
Q

High copper amalgam prevent

A

gamma 2 phase. Corrosion resistant

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35
Q

What amalgam packs more efficiently

A

spherical

36
Q

Amalgam with more strength and less voids

A

spherical

37
Q

Amalgam harder to get proximal contact with

A

spherical

38
Q

amalgam with low packing density

A

lathe cut

39
Q

Higher condensing forces needed for

A

lathe cut

40
Q

Liner used when

A

remaining dentin thickness (RDT) is more than 2 mm

41
Q

Example of solution liner and % of seal per layer

A

copal varnish:
1 layer = 55% sealed
2 layers = 85% sealed

42
Q

Suspension liner is _____ based

A

water

43
Q

suspension liner example

A

Dycal

44
Q

Cement liner

A

glass ionomer aka Fuji lining

45
Q

2 Eugenol liners

A

ZOE and B&T

46
Q

ZOE can be reinforced with fillers to create

A

IRM (intermediate restorative material)

47
Q

main difference between base and liner

A

P:L. more P in bases

48
Q

Bases are used when

A

RDT is .5-2 mm

49
Q

old school base mixed on a cool slab

A

ZnPO4

50
Q

Why are GI better bases

A

they adhere to tooth structure, release fluoride, high clinical record of retention, dimensionally stable, biocompatible.

51
Q

What must you do before applying base

A

condition dentin to clean away smear layer

52
Q

GI liner

A

KetacCem

53
Q

GI Base

A

KetacFil

54
Q

Concave side of band should vace

A

gingiva

55
Q

2 matrix band used for

A

posteriors with deep proximal surfaces

56
Q

1 matrix band used for

A

routine sized proximal caries

57
Q

Wider embrasure space

A

lingual, usually

58
Q

why burnish band

A

proximal contact

59
Q

Condensing amalgam should be completed within

A

3-4 min

60
Q

why condense

A

Bring residual Hg to surface, maintain homogeneity

61
Q

Oregon 2 condensers are

A

1 and 1.5 mm

62
Q

Oregon 4 condenser size

A

2 and 3 mm

63
Q

what condenser is good for lathe cut

A

oregon 2

64
Q

What condenser is good for spherical

A

oregon 4

65
Q

push stroke is used to

A

define developmental grooves

66
Q

If there are minimal caries

A

if remaining dentin thickness (RDT) is more than 2mm, place a liner of two layers of copal varnish to create an 85% seal or place adhesive then fill with amalgam

67
Q

If there are moderate caries

A

if remaining dentin thickness (RDT) is 0.5-2 mm and the ideal prep does not remove all carious tissue forcing you to extend laterally until the DEJ and all dentin are non carious, place a base to replace the missing dentin (either GI or ZNPO4) then place a liner (copal varnish or adhesive) before filling

68
Q

If there are gross caries

A

extend until DEJ is all non carious and carious dentin is removed BUT leave caries over pulp instead of pulping the tooth

69
Q

if there are deep caries

A

if Remaining Dentin Thickness (RDT) is less than 0.5mm and there is no pulp exposure - CaOH (Dycal), Base (GI or RMG), Copal varnish liner, then amalgam

70
Q

when is sedative restoration used

A

questionable pulp status

71
Q

order of procedure if pulped

A

pulp cap with CaOH, conditioner, Base (RMGI), Copal Varnish, Amalgam

72
Q

When is quadrant dentistry indicated

A

multiple lesions in one quadrant, kissing cavities, or if patient is going under

73
Q

Why aren’t teeth restored simultaneously in quadrant dentistry

A

excessive wedging, chance of open margin, no adjacent marginal ridge for direction

74
Q

why would isthmus fracture

A

too shallow pulpal depth

75
Q

going incisally, three surfaces of Class V prep

A

gingival wall
incisal wall
axial floor

76
Q

How long until u can polish amalgam

A

24 hrs after placement

77
Q

working time

A

5 minutes

78
Q

describe an open margin

A
  • catches pigtail both directions
  • Caused by overhang or poor condensation
  • restoration must be replaced
79
Q

Describe a flash

A
  • catches pigtail
  • excess material will chip off and undermine restoration
  • flash must be carved flush with cavosurface margin
80
Q

Describe submargin

A
  • catches pigtail
  • excess material will chip off and undermine restoration
  • replace restoration if >0.2 mm
81
Q

2 results of overtrituration

A
  • soupy

- sets early

82
Q

2 results of undertrituration

A
  • grainy

- decreased strength

83
Q

weakest phase in low copper amalgam

A

gamma 2 - results in low corrosion resistance

84
Q

where do proximal caries appear on posterior tooth

A

gingival to contact

85
Q

ideal pulpal depth of prep

A

.5 mm beyond DEJ

86
Q

ideal axial depth

A

.5-.75 mm beyond DEJ

Anatomy (11 decks)

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