Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Operative: lecture > Lecture midterm > Flashcards

Lecture midterm Flashcards

1
Q

two cavities should not be combined unless the separating ridge is less than

A

0.5mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

when can you extend into the oblique ridge of 1st maxillary molars

A

if its undermined by caries

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

isthmus width should not exceed ____ intercuspal distance

A

1/3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what depth into dentin should a cavity prep be

A

0.2-0.5mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

why do we prep cavities with converging buccal and lingual walls?

A

follows direction of enamel rods

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

how much of the marginal ridge should be conserved

A

1.6mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

prevents dislodgment of the restoration by lifting or tipping

A

retention form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

increased surface area helps to increase friction for what cavity prep feature

A

retention form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

opposing walls slightly converging is what type of prep feature

A

retention form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

sufficient access to the cavity is what type of prep feature

A

convenience form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

why is convince form import for visibility

A

removal of all decay

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

needs for access to the prep for instruments

A

convenience form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

important prep feature to achieve the best marginal seal

A

finishing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

removing jagged edges or rough outline is what type of prep feature

A

finishing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

the final step before the prep receives restorative material

A

Debridement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

rising the cavity with air/water spray and high suction

A

Debridement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

removes smear layer from cavity prep

A

Debridement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

dental shavings on cavity preparation

A

smear layer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

remove moister (blood & saliva) from prep

A

Debridement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

the junction between the external walls of the cavity preparation and the uncut tooth structure

A

cavosurface margin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

the shape of the cavity preparation

A

outline form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

what are the three factors that govern outline form

A

conservation of tooth structure
location & extend of caries
position of pits & fissures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

unnecessary loss of healthy tooth structure

A

extension for prevention

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

preservation of remaining tooth structure- minimal extension

A

conservative approach

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

removal of carious area and any weak enamel

A

outline form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Helps the restoration to withstand the forces directed towards the long axis of the tooth

A

resistance form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

primary resistance features

A 
removal or undermine enamel 
flat floor
adequate depth
well defined line angles
type of restorative material
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

cavosurface margin should not terminate on unsupported enamel

A

resistance form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

minimum amalgam thickness to withstand forces

A

1.5mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

what makes the amalgam margin angle & smoothness so important

A

low edge strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

taper of a 330 bur

A

8 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

tapper of a 245 bur

A

4 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

what shape burs are 229-330

A

pear

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

length of 330 bur

A

1.5mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

length of 245 bur

A

3.0mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

diameter of 330

A

0.8mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

diameter of 245

A

0.8mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

not efficient at cutting ductile material (dentin)

A

abrasives / Diamond

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

recommend for intracoronal preparations

A

bladed cutting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

force applied perpendicular to cutting edge

A

direct cutting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

force applies parallel to the cutting edge

A

indirect cutting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

can do lateral and direct cutting

A

enamel hatchet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

cutting edge makes an angle to the long axis of the blade

A

marginal trimmer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

what is a lesion caused by mechanical factors

A

none carious lesion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

what rotary instrument runs at 12,000 - 20,000 rpms

A

Medium speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

type of bur that is used for extracoronal preps

A

diamond

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

In OSU’s lab do we use negative or positive rake angle burs?

A

negative

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

These burs are efficient at cutting but get clogged and break easily

A

Postive rake angle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

Bur cuts by shearing layers of tooth structure

A

Bladed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

Bur cuts by removing a mono layer

A

Diamond

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

The hard but brittle material that is used to make bladed burs

A

tungsten carbide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

A bigger ____ angle created less friction on the tooth

A

clearance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

Not for cutting just refining the cavity prep

A

Hand instruments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

In hand instruments creates balance and directs the forces onto the cutting angle

A

contra angle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

why don’t we use mono angle instruments in the mouth

A

forces out of balance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

Rotary instrument that turns at a rate below 12,000 rpms

A

slow speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

Rotary instrument that turns at a rate above 20,000 rpms

A

high sleep

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

Besides cavity preps what is another use for the high speed instrument

A

removing old restorations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

why is the neck of the bur constricted

A

visibility

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
60
Q

A large number of blades on a bur give the prep a. . . .

A

smooth finish

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
61
Q

dental Material is place in a soft state and contoured before it sets

A

Direct restoartion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
62
Q

Restoration is fabricated outside of the oral cavity then cemented or bonded to the tooth

A

indirect restoration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
63
Q

The clearance face is in front of the axis line (of the bur)

A

postive

64
Q

how many surfaces does a compound cavity prep involve

A

2

65
Q

how many surfaces does a complex cavity prep involve

A

3

66
Q

what is a class 1 prep?

A

Pits and fissures

67
Q

what angle should the cavosurface margin be?

A

90 degree

68
Q

Cariesclassification: occlusal surface of premolars and molars; buccal or lingual pits/ fissures of the molars; lingual pit near cingulum of maxillary incisors

A

Class I

69
Q

Caries classification: Proximal surface (mesial and/ or distal) of premolars and molars

A

Class II

70
Q

Caries classification: Proximal surface (mesial and/ or distal) of incisors and canines

A

Class III

71
Q

Caries classification: Proximal surface of incisors and canines but also the incisal edge

A

Class IV

72
Q

Caries classification: Gingival third of the facial or lingual surface on any tooth

A

Class V

73
Q

Caries classification: involve the inciscal edges of anteriors or cusp tips of posteriors

A

Class VI

74
Q

cutting motion from beveled to non beveled edge of a hand instrument

A

Lateral / indirect cutting

75
Q

Cavity prep principle: smooth pulpal and gingival floor provides

A

resistance form

76
Q

Removing undermined enamel from the cavity preparation provides

A

resistance form

77
Q

Ideal isthmus width is ______ of the intercupsal distance

A

1/4 - 1/3

78
Q

Ceramics are

A

brittle

79
Q

ceramic mimic what part of the tooth

A

enamel

80
Q

gold is

A

ductile

81
Q

Gold mimic what part of the tooth

A

dentin

82
Q

Dentin provides ____ that helps to adjust to condensing

A

elasticity

83
Q

why do we drill 0.05mm into dentin

A

elastic recoil

84
Q

The dove tail feature is

A

retentive

85
Q

Minimum isolation for a rubber dam is ____ posteriorly and _____ anteriorly

A

1, 2

86
Q

All line angles of a class V prep are

A

divergent facially

87
Q

The prongs of a clamp on the rubber have to be touching _____ line angles

A

all four

88
Q

The tip of the hole back should be placed in ___ during carving

A

central groove

89
Q

Is done because the softest phase of amalgam stays on top

A

overfilling

90
Q

what needs to be done with the top layer of over filled amalgam

A

carved away

91
Q

Why is the top phase of the amalgam filling softer

A

mercury rich

92
Q

What need to be done if the amalgam filling has an open margin

A

redone

93
Q

What need to be done if the amalgam filling is submarginal

A

enameloplasty

94
Q

Are open margins sealed?

A

No

95
Q

Are submerging sealed

A

just shy (.2)

96
Q

Has to be removed from the filling with a finishing bur

A

flash

97
Q

Admix - blend of lathe cut and spherical particles

A

Permite C

98
Q

When the membrane of the amalgam capsule is ruptured what happened

A

mercury in contact with alloy

99
Q

Process by which mercury is allowed to react with the alloy powder

A

Trituration

100
Q

Trituration

A

Amalgamation

101
Q

How long should the amalgamator be set

A

7/8 seconds

102
Q

Amalgam that is soupy, difficult to remove

A

Over Trituration

103
Q

Excess matrix is formed in

A

Over Trituration

104
Q

Soft shiny, warm

A

proper mix

105
Q

Amalgam that is grainy, is dull and crumbles

A

Undertrituration

106
Q

under triturated amalgam has

A

reduced strength

107
Q

under triturated amalgam is

A

hard to handle

108
Q

Amalgam that has optimal properties

A

proper Trituration

109
Q

The process of compressing the allot into the tooth preparation and eliminating voids

A

condensation

110
Q

Force / area =

A

pressure

111
Q

A shiny rich mercury phase viable and you’ll head a crunch

A

adequate condensing

112
Q

From the center to periphery

A

condensing

113
Q

Which end of the condenser should be used as you approach the external surface of the tooth

A

large

114
Q

In what time frame (for permite C) should condensing be completed?

A

3-4 minutes

115
Q

Should the last increment of amalgam extend over the preparation?

A

yes (1mm)

116
Q

How should amalgam be added to the cavity preparation

A

in increments

117
Q

using the round face of the condenser either perpendicular to the long axis or axis at 45 degrees

A

vertical strokes

118
Q

using the side of the condenser either parallel to the long axis of at 45 degrees

A

lateral storkes

119
Q

Type of stroke used solely in class I preps with extensions or in proximal boxes

A

lateral / horizontal strokes

120
Q

over filling is done to extract ____ from the preparation

A

mercury

121
Q

over filling helps to

A

seal the margins

122
Q

What can form if condensing goes beyond 3-4 minutes

A

cracks in matrix

123
Q

used between condensing and final carving

A

anatomical burnisher

124
Q

Carving instruments should always be resting

A

partially on tooth structure

125
Q

Used to define the developmental grooves

A

push stroke

126
Q

High gentle pressure moving the carver parallel to the margins

A

pull stroke

127
Q

Motion from tooth structure to amalgam

A

push stroke

128
Q

Carving is done of two planes for this prep

A

Class V

129
Q

What are the two planes of carving for the Class V prep

A

gingival and occlusion

130
Q

Over-contoured cusps, shallow central groove, shallow fusses and high occlusal contract are a result of

A

under carving

131
Q

Deep central groove, steep triangular ridges, deep marginal fossas are result of

A

over carving

132
Q

Break between tooth and the amalgam restoration / not continuous

A

open margin

133
Q

The seal between the alarm and the enamel is not broken (<0.2mm)

A

submarginal

134
Q

if the gap is marginal > 0.2mm

A

restoration needs replaced

135
Q

When the patient bites down this will be broken easily

A

flash

136
Q

If the tip of the explore catches from tooth to amalgam and not from amalgam to tooth structure at the margins

A

flash

137
Q

Marginal voids due to inadequate condensation

A

open margins

138
Q

How do you fix open margins

A

re do

139
Q

Tip of the explorer catches when moved in both directions across the margin

A

open margin

140
Q

Tip of the explorer catches when moved form amalgam to tooth but not from tooth to amalgam at the margin

A

submarginal

141
Q

Serves to substitute to conventional polishing, can help to improve marginal integrity

A

post carve burnishing

142
Q

A moist cotton tip applicator to clean the surface from minute scrap and debris

A

Cleaning surface

143
Q

Should occlusion be checked before after removal of rubber dam

A

after

144
Q

Ideal occlusion mark are on the _____ cusps and the _____

A

functional, marginal ridge areas

145
Q

Clinically gingival clearance for a proximal box

A

0.5mm

146
Q

In typodonts the proximal contacts are more

A

occlusal

147
Q

In a class V prep the wall that runs parallel to the root axis is the

A

axial wall

148
Q

the diameter of the 1/4 round is

A

0.5mm

149
Q

The distance from the external surface to the axial wall

A

axial depth

150
Q

Axial depth on the crown of a Class V prep

A

1.0 -1.25mm

151
Q

Axial depth on the root of a Class V prep

A

0.75mm

152
Q

What is the primary mechanical retention of a class V prep

A

there is none

153
Q

Because there is no primary mechanical retention of a class V prep we add

A

retention grooves

154
Q

The incised, gingival, mesial and distal walls of a class V prep are all

A

divergent

155
Q

What is the retention groove call

A

auxiliary/ secondary retention

Operative: lecture (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions