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Pres/Res > Midterm - Amalgam > Flashcards

Midterm - Amalgam Flashcards

1
Q

3 Reasons for Rubber Dam

A

Isolation - Moisture Control
Access - Retraction
Harm Prevention

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2
Q

Advantages to Rubber Dams

A 
dry, clean operating field
isolation
max patient safety
max operator safety
improve restorative material properties
optimize restorative outcomes
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3
Q

Disadvantages to Rubber Dams

A

time consumption
patient objection to use
not usable on all teeth (3rd, partial, malpositioned)

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4
Q

Forms of Isolation

A

cotton roll
svedopter
iso-dry
rubber dam

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5
Q

Materials for Rubber Dam Use

A 
dam
dam template
frame 
floss
scissors
forceps
punch
retainer
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6
Q

Steps to Rubber Dam Use

A

determine operating field (1-2 teeth distal to opposite bi)
prepare the dam
select proper retainer (4 points need to contact tooth)
place the dam (invert ridges, ligatures)
remove rubber dam

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7
Q

Caries Classification

A 
Class I - pit fissure
Class II - posterior proximal
Class III - anterior proximal
Class IV - class III + incisal edges
Class V - gingival 1/3 anterior and posterior
Class VI - cups tips posteriors
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8
Q

Outline Form Defintion

A

shape of the area of the tooth surface included within the cavosurface margins of the cavity prep of a dental restoration

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9
Q

Resistance Form Definition

A

shape given to a prep that enables the restoration to withstand masticatory forces

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10
Q

Retention Form Definition

A

shape of a prep that prevents displacement of the restoration by lateral or tipping forces, as well as masticatory forces

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11
Q

Convenience Form Definition

A

changes needed outside the basic outline to enable proper instrumentation for cavity prep and insertion of the restoration

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12
Q

External Walls

A 
buccal
distal
mesial
lingual
gingival (if one of the above is missing)
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13
Q

Internal Walls

A

axial

pulpal

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14
Q

Floor “seat”

A

pulpal

gingival

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15
Q

Resistance Form Principles

A

flat gingival/pulpal floor
conservative extension of the external walls
rounded internal line angles
covering weak cusps with restorative material
sufficient depth of preparation allowing for proper thickness of restorative material
bonding of restorative material to tooth

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16
Q

Retention Form Principles

A 
Amalgam:
buccal and lingual walls converge
distal and mesial walls diverge
dovetails
retention grooves
17
Q

Amalgam Preparation Principles

A

do not terminate on cusp tips
remove unsupported amalgam
preserve cuspal rige and marginal ridge (2mm molars, 1.6mm premolars)
preserve oblique ridge in max molars (1mm)
do nto extend to unaffected fissures
preserve cuspal inclines
smooth curves, no sharp edges
uniform pulpal depth (1.5mm 0.5mm from DEJ)
90 degree cavosurface margin
anatomy dictates occlusal outline form

18
Q

Amalgam Restorative Principles

A 
incremental placement
multidirectional condensation
overfill
pre-carve burnish
carve (form and function)
adjust occlusion
19
Q

Advantages Amalgam

A

ease of use
compressive strength and wear resistant
long term clinical success
lower cost

20
Q

Disadvantages Amalgam

A 
non-esthetic
non-insulating
weakens tooth
technique sensitive
more difficult prep
initial marginal leakage
21
Q

Isthmus Width Occlusal Amalgam

A

1mm, no more than 1/4 intercuspal width

22
Q

Maxillary Class I Amalgam Preps

A 
cut at the expense of the oblique ridge (cut DL cusp)
leave 1mm sound enamel by oblique ridge
OL - axial wall should be 1mm
OL - axial wall should be convex 
OL - rounded axiopulpal line angle
23
Q

Class II Amalgam

A

gingival floor width 1-1.5mm axially (0.5 mm from DEJ)
gingival “seat” follows external contour of the tooth
rounded axiopulpal line angle
proximal contact is visibly broken (tine of explorer, 0.5mm)

24
Q

Class II Amalgam Materials

A

Tofflemire retainer

matrix bands

25
Q

Components of Tofflemire

A

head
locking vise
long knob (moves locking vise)
short knob (locks band in)

26
Q

Matrix Band Uses

A 
restoration of proximal surfaces
develop proper contacts
develop proper contour
confine restoration material
reduce excess restorative material
protect adjacent teeth
27
Q

Matrix Band Desirable Properties

A

easy application and removal
extension below gingival margin of the prep
extension above marginal ridge
resist deformation during material placement

28
Q

Band Placement

A

tofflemire should be on buccal side
band arch on head of retainer always points to occlusal
wedges inserted from buccal or lingual

29
Q

Wedge Uses

A

compress band against tooth - tighter seal
prevent gingival overhang
provide slight separation between teeth

30
Q

Types of Wedges

A

fender - protect adjacent tooth, sharp
Anatomic - no expansion
Wood - sycamore wood, expand and conform when wet

31
Q

Amalgam Post-Op Instructions

A

avoid hard/sticky food 24 hours
Sensitivity to cold or hot can occur
gum soreness

Pres/Res (3 decks)

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