1. Class III and V Composite Preparations Flashcards
Class III Lesions
____ surface caries;
Similar to Class ____ and Class ____
Located below ____ points of anterior teeth
smooth
II
V
contact
Class III Caries
Size of preparation depends on extent of:
____
____
caries
defective restoration
Class III Caries
Cones of decay have an “____” relationship
apex to base
Class III Caries Diagnosis
____
____
radiograph
transillumination
Class V Carious Lesions
Originates in the ____ thirds of teeth
Occurs on ____ surfaces of tooth
____ surfaces - most common
cervical (gingival)
smooth
facial
Class V Carious Lesions
Also ____ surface lesions
Also ____ relationship at the DEJ
smooth
apex to base
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)
minimal
enamel
depth
uniform
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
bevel
retention/surface
shade
rough
surface
diamond
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
lingual
color
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 \_\_\_\_
rectangular
perpendicular
parallel
long axis
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
apical
intact
1.5mm-2mm
Principles of Class III Preparation for Composite
Restoration
General Outline Form:
From proximal:
____
Facial cavosurface margin ____ with facial contour of tooth
trapezoid
parallel
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
1.5mm-2mm facial-lingully
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
internal
external
DEJ
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
etching
traditional
bevel
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
root
enamel
Principles of Class III Preparation for Composite
Restoration
Optional Retentive Grooves:
IF placed:
retentive groove along
____ wall
retentive point at ____ line angle
gingival
incisal axial
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
90
unsupported
Principles of Class III Preparation for Composite
Restoration
Resistance Form:
Internal line angles should be slightly ____ to minimize stress concentration in the restoration
rounded
Principles of Class III Preparation for Composite
Restoration
Marginal integrity:
____ and bonding of the enamel surface reduces ____ at the cavosurface margin
etching
leakage
Principles of Class III Preparation for Composite
Restoration
Marginal integrity:
Bevel – increases ____ surface to be etched
enamel
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
facial
mandibular anterior
facial
irregularly
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
diamond
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 ____
incisogingival
1.5mm-2mm
supragingival
Class III Preparation
Clinically, extent of ____ will determine size of outline form
Maintain ____ in natural tooth
decay
incisal contact
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
proximal
within
Class III Preparation
____ outline form is refined and axial wall established with side of diamond bur
Refine and remove any ____ enamel
lingual
unsupported
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
0.5
parallel
incisally
gingivally
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
- 5
1. 5
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
1
2
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
1.5-2
parallel
Class III Preparation
Retention Grooves ONLY WHEN ____
Gingival Retention
Shallow, but distinct groove in gingival ____ wall, F-L
Entirely within ____
Not only in ____ wall
required
dentinal
dentin
axial
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
bur
inciso-axial-facial
axial
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 ____
45
0.5
1
enamel
Class III Preparation
Advantages of bevel
Removes ____ external enamel to
expose more ____ subsurface enamel
Provides well-defined marginal ____ to finish
acid resistant
reactive
periphery
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
outline
lesion
enamel
0.5-1
Class V Composite Preparation
Axial wall ____ - parallel to the external surface of the tooth
Axial wall is just within ____
All ____ enamel removed
curves
dentin
unsupported
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
parallel
parallel
1.0
1.5
Class V Composite Preparation
Mesial and distal walls ____ toward cavosurface to parallel enamel rods
diverge
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
necessary
adheres
walls
Class V Preparation
Convenience Form
If access or visibility is difficult, you may need to extend the preparation a little ____
larger
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
M-D O-G decalcified conservative 0.5 before
Class V Composite Resin Preparation Above the CEJ
The Bevel: Width: \_\_\_\_ mm long FOR ENAMEL ONLY(above CEJ) Understand Why
0.5-1
Summary - Class V Composite Resin Bevel ____ the CEJ
No extension onto ____ surface (Bevel present ____)
above
root
circumferentially
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
gingival clamp
Class V Composite Resin Preparation Below CEJ
The Bevel: On \_\_\_\_ only Width: \_\_\_\_ mm long only where enamel exists NO bevel on \_\_\_\_
enamel
0.5-1
cementum
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
enamel
gingival/axial
CEJ
Class V Composite Resin Preparation- Root Caries
Same preparation as previous but, NO ____
Retention
grooves would be placed both ____ and ____
bevel
incisally/occlusally
gingivally
Non-carious Class V Lesions
Can be above or below ____
Ditched cervical areas on facial surfaces
Tooth Brush ____ Chemical ____
____
CEJ
abrasion
erosion
abfraction
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 ____
defect
defect
bevel
cementum
