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Operative Dentistry, Module II > 1. Class III and V Composite Preparations > Flashcards

1. Class III and V Composite Preparations Flashcards

1
Q

Class III Lesions

____ surface caries;
Similar to Class ____ and Class ____
Located below ____ points of anterior teeth

A

smooth
II
V
contact

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2
Q

Class III Caries
Size of preparation depends on extent of:
____
____

A

caries

defective restoration

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3
Q

Class III Caries

Cones of decay have an “____” relationship

A

apex to base

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4
Q

Class III Caries Diagnosis
____
____

A

radiograph

transillumination

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5
Q

Class V Carious Lesions
Originates in the ____ thirds of teeth
Occurs on ____ surfaces of tooth
____ surfaces - most common

A

cervical (gingival)
smooth
facial

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6
Q

Class V Carious Lesions
Also ____ surface lesions
Also ____ relationship at the DEJ

A

smooth

apex to base

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7
Q

Class III and Class V Composite Resin Preparations

Composite vs Amalgam:

OUTLINE FORM:
____ extension for prevention
• Preserve as much ____ as possible

RESISTANCE FORM:
Axial wall can be of varying ____ (does not need to be ____ for “bulk thickness of material - to resist fracture of material)

A

minimal
enamel
depth
uniform

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8
Q

Class III and Class V Composite Resin Preparations

RETENTION FORM:
Enamel ____ part of preparation
• To increase ____ area
* ALSO: Eases blending ____ at marginal area

Preparation walls are left ____
• Increases ____ area for bonding
• Use ____ burs vs carbides

A

bevel
retention/surface
shade

rough
surface
diamond

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9
Q

Principles of Class III Preparation for Composite
Restoration

\_\_\_\_ access:
   Maintains/preserves facial enamel
   Maintains natural appearance
   Easier \_\_\_\_ matching
   Eventual discoloration or
breakdown of restoration less visible
A

lingual

color

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10
Q

Principles of Class III Preparation for Composite
Restoration

General Outline Form:
Lingual Approach   
\_\_\_\_ Shape
   Incisal and gingival wall \_\_\_\_ to the
long axis and \_\_\_\_ to
each other
   Axial wall parallel to \_\_\_\_
A

rectangular
perpendicular
parallel
long axis

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11
Q

Principles of Class III Preparation for Composite
Restoration

General Outline Form:
Lingual Approach
   incisal margin \_\_\_\_ to contact point
• keep contact \_\_\_\_ 
• \_\_\_\_ inciso-
gingivally
   smooth and flowing outline form
A

apical
intact
1.5mm-2mm

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12
Q

Principles of Class III Preparation for Composite
Restoration

General Outline Form:
From proximal:
____
Facial cavosurface margin ____ with facial contour of tooth

A

trapezoid

parallel

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13
Q

Principles of Class III Preparation for Composite
Restoration

General Outline Form:
  From proximal:
   Correct facial-lingual depth of
preparation
• \_\_\_\_ facial-lingually
   Smooth and flowing outline form
A

1.5mm-2mm facial-lingully

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14
Q

Principles of Class III Preparation for Composite
Restoration

Retention Form:
1. ____ outline of preparation is wider than the ____ outline

Clinically, removal of decay that has spread out at the ____->prep is wider internally than externally

A

internal
external
DEJ

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15
Q

Principles of Class III Preparation for Composite
Restoration

Retention Form:
2. ____ and bonding resin to enamel and dentin
Composite resin bonds to tooth structure
____ forms of retention are usually not needed
Place a ____ on enamel margin

A

etching
traditional
bevel

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16
Q

Principles of Class III Preparation for Composite
Restoration

Retention Form:
Composite resin bonds to tooth structure;
therefore, traditional forms of retention are
usually not needed

Exception: ____ surface preparation
no ____ support for strong bond strengths

A

root

enamel

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17
Q

Principles of Class III Preparation for Composite
Restoration
Optional Retentive Grooves:

IF placed:
retentive groove along
____ wall
retentive point at ____ line angle

A

gingival

incisal axial

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18
Q

Principles of Class III Preparation for Composite
Restoration

Resistance Form:
All walls of the cavity preparation should initially form a ____o angle at cavosurface margins - butt joint
No ____ enamel rods

A

90

unsupported

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19
Q

Principles of Class III Preparation for Composite
Restoration

Resistance Form:
Internal line angles should be slightly ____ to minimize stress concentration in the restoration

A

rounded

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20
Q

Principles of Class III Preparation for Composite
Restoration

Marginal integrity:
____ and bonding of the enamel surface reduces ____ at the cavosurface margin

A

etching

leakage

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21
Q

Principles of Class III Preparation for Composite
Restoration

Marginal integrity:
Bevel – increases ____ surface to be etched

A

enamel

22
Q

Class III Preparation
Facial Approach

   IF decay begins on \_\_\_\_ surface    
IF on \_\_\_\_ teeth    
IF decay extends onto \_\_\_\_ surface from proximal and lingual surface is intact
   IF teeth are \_\_\_\_ aligned
making lingual access undesirable
A

facial
mandibular anterior
facial
irregularly

23
Q

Class III Preparation

Begin preparation with pear shaped ____ bur
Enter lingual surface just beneath contact point
Hold handpiece with tip of bur perpendicular to tooth

A

diamond

24
Q

Class III Preparation

Move bur in an ____ direction to create trough
Extend trough gingivally to provide access for instrumentation (about ____ inciso-gingivally)
gingival margin kept ____

A

incisogingival
1.5mm-2mm
supragingival

25
Q

Class III Preparation

Clinically, extent of ____ will determine size of outline form
Maintain ____ in natural tooth

A

decay

incisal contact

26
Q

Class III Preparation

Leave thin shell of enamel along ____ surface
by working ____ tooth, not inward (axially) from proximal surface
Gradually thin with the diamond bur until paper-thin
Use excavator to break away enamel

A

proximal

within

27
Q

Class III Preparation

____ outline form is refined and axial wall established with side of diamond bur

Refine and remove any ____ enamel

A

lingual

unsupported

28
Q

Class III Preparation

Prepare axial wall ____ mm within dentin, ____ to long axis of tooth

Preparation will be deeper ____ than ____, because of greater enamel
thickness along incisal wall

A

0.5
parallel
incisally
gingivally

29
Q

Class III Preparation
The Incisal Wall:
Width:
Measures ____ mm Mesio-Distally at a 90 ̊ angle to the proximal surface

Depth:
Measures ____ mm Facially at a 90 ̊ angle to the Lingual surface

A
  1. 5

1. 5

30
Q

Class III Preparation
The Gingival Wall:
Width:
Measures ____ mm Mesio-Distally at a 90 ̊ angle to the proximal surface
Depth:
Measures ____ mm Facially at a 90 ̊ angle to the Lingual surface

A

1

2

31
Q

Class III Preparation
The Axial Wall:

Length:
Measures ____mm Parallel to the long axis of the tooth

The Facial Wall:
____ to the facial surface of the tooth

A

1.5-2

parallel

32
Q

Class III Preparation

Retention Grooves ONLY WHEN ____

Gingival Retention
Shallow, but distinct groove in gingival ____ wall, F-L
Entirely within ____
Not only in ____ wall

A

required
dentinal
dentin
axial

33
Q

Class III Preparation

Retention Grooves
ONLY WHEN required

Incisal Retention
Slightly larger than the size of ____
At ____ point angle
Angled toward ____ wall to minimize potential fracture of incisal edge

A

bur
inciso-axial-facial
axial

34
Q

Class III Preparation

Finishing cavosurface margins
Place a ____ degree bevel at least ____mm wide on accessible enamel margins - use angled diamond bur
Prefer ____ mm
Bevel only ____

A

45
0.5
1
enamel

35
Q

Class III Preparation
Advantages of bevel

Removes ____ external enamel to
expose more ____ subsurface enamel

Provides well-defined marginal ____ to finish

A

acid resistant
reactive
periphery

36
Q

Class V Composite Resin Preparation

Clinically, Class V composite preparations conservatively follow the Class V amalgam preparation \_\_\_\_
EXCEPT
   size determined by the \_\_\_\_
\_\_\_\_ cavosurface margins
are beveled to 45 degrees, \_\_\_\_mm long
A

outline
lesion
enamel
0.5-1

37
Q

Class V Composite Preparation

Axial wall ____ - parallel to the external surface of the tooth
Axial wall is just within ____
All ____ enamel removed

A

curves
dentin
unsupported

38
Q

Class V Composite Preparation

Incisal and gingival walls ____ to enamel rods
Axial wall ____ to long axis of tooth
Gingival wall ____mm
Incisal/Occ wall ____mm Understand Why

A

parallel
parallel
1.0
1.5

39
Q

Class V Composite Preparation

Mesial and distal walls ____ toward cavosurface to parallel enamel rods

A

diverge

40
Q 
Class V Composite Preparation
  Mechanical Retention (NOT \_\_\_\_) if lesion confined above the CEJ...

Because we are using a bonding technique that ____ very well to enamel and all the ____ of the preparation are in enamel

A

necessary
adheres
walls

41
Q

Class V Preparation

Convenience Form

If access or visibility is difficult, you may need to extend the preparation a little ____

A

larger

42
Q

Class V Composite Resin Preparation Above the CEJ

External Outline:
External Outline:
Include the existing carious lesion ____ and ____ and ALL ____ enamel
Follow the contour of the classic CL V lesion, but keep ____

Depth:
Measures ____ mm into dentin at a 90 ̊ angle to the facial surface ____ the bevel

A 
M-D
O-G
decalcified
conservative
0.5
before
43
Q

Class V Composite Resin Preparation Above the CEJ

The Bevel:
Width:
\_\_\_\_ mm long
FOR ENAMEL ONLY(above CEJ)
Understand Why
A

0.5-1

44
Q

Summary - Class V Composite Resin Bevel ____ the CEJ

No extension onto ____ surface (Bevel present ____)

A

above
root
circumferentially

45
Q

Class V Composite Resin Preparation Below CEJ
External Outline:
External Outline:
Same as previous
Most likely need a ____ if there is not gingival recession

Depth:
Same as previous

A

gingival clamp

46
Q

Class V Composite Resin Preparation Below CEJ

The Bevel:
On \_\_\_\_ only
Width:
\_\_\_\_ mm long only where enamel exists
NO bevel on \_\_\_\_
A

enamel
0.5-1
cementum

47
Q

Class V Composite Resin Preparation Below CEJ

Mechanical Retention needed
Bonding to cementum and dentin is not as great as ____
Place retention grooves in ____ line angle below ____ only

A

enamel
gingival/axial
CEJ

48
Q

Class V Composite Resin Preparation- Root Caries

Same preparation as previous but, NO ____

Retention
grooves would be placed both ____ and ____

A

bevel
incisally/occlusally
gingivally

49
Q

Non-carious Class V Lesions

Can be above or below ____

Ditched cervical areas on facial surfaces
Tooth Brush ____ Chemical ____
____

A

CEJ
abrasion
erosion
abfraction

50
Q

Non-carious Class V Preparation

Width/Height:
Size of existing ____ M-D and O-G

Depth:
Depth of existing ____

Retention:
Place a ____ (if in enamel)
Place retention grooves where in ____

A

defect
defect
bevel
cementum

Operative Dentistry, Module II (7 decks)

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