3. Class I Amalgam Preparation Flashcards
Principles of Cavity Preparation
- ____ form
- Resistance form
- ____ form
- Convenience form
- Remove any remaining carious ____
- Finish the enamel walls – remove unsupported enamel
- ____ the cavity preparation
outline
retention
dentin
cleanse
Outline Form
Determined by:
Location and size of the carious lesion, defect, or faulty restoration
____ morphology
Finish margins in self cleansing or easily cleansable areas
Margins should end in sound ____
Kind of ____ being used
Resistance Form
Determined by:
____ form
dental
enamel
restorative material
box
Resistance Form
Wall angulations
Prepare the internal walls ____ to
the enamel rods/prisms
Cavity preparation depth
To provide bulk strength of restorative material
Internal line angles
Should be slightly ____ to minimize stress
concentration
Restorative material
Different materials have different needs to be met
parallel
rounded
Retention Form Determined by: \_\_\_\_ friction \_\_\_\_ Walls Undercut points and grooves Auxiliary retention: \_\_\_\_ Parallel grooves \_\_\_\_ Bonding
Convenience Form
Gain sufficient access to the lesion to facilitate ____ and instrumentation in the preparation and restoratation process
wall
convergent
dovetails
pins
visibility
Remove any remaining carious dentin
- for mild, moderate and large caries: start with ideal ____ form first
- then, remove remaining caries
Caries removal with a large round bur on slow speed and a spoon excavator
for gross caries:
ONLY time the ideal ____ form cannot be
obtained first.
Most of the structure is destroyed by this point.
Remove ____ first, evaluate what is left, and refine the preparation.
outline
outline
caries
- Remove any remaining carious dentin
RE-EVALUATE the preparation often to detect sound tooth structure:
____ feedback
Auditory feedback
____
Caries detecting dye is completely removed - Finish enamel walls
Remove all ____ enamel
tactile
texture
unsupported
- Cleanse the prepared cavity
Clean and dry for inspection
Once clean, it is ready to receive the
restoration
Sometimes medicaments are applied after cleansing, prior to the restorative step
– Not proven to be ____
Summary: goal of restorative treatment
Detect and Diagnose Caries
Assess Caries Risk
Remineralize where possible, depending on risk
ELIMINATE diseased tissue following the Principles of Cavity Preparation
Restore the tooth to form, function and esthetics
significant
Class I Lesion
Originates in structural
defects of teeth
____
Class I Locations
Most often on the ____ surfaces of ____ teeth
pits and fissures
occlusal
posterior
Class I locations
Also:
On the ____ and ____ surfaces of ____ teeth where grooves terminate
Remember: Can also be on the ____ surfaces of anterior teeth – mostly ____
buccal
lingual
posterior
lingual
Classification by Complexity
Simple
Prepared cavities involve only ____ tooth
surface
Classification by Surface One Surface Take the name of that surface Occlusal Buccal pit Lingual pit
one
Review: developmental anatomy
A failure in the fusion of enamel at the bottom of the grooves and fossae, causes the formation of deep invaginations that may extend as far as the ____.
Caries progression
The initial lesion develops on the lateral walls, following the direction of the ____.
The surrounding enamel can appear as ____ or opaque
enamel rods
discolored
Caries progression
Caries progression of the opposing walls continues.
Appears discolored or opaque, as in the previous stage.
Caries progression is ____ to detect at this stage. Radiographs assist in diagnosis
difficult
Caries Progression
Extensive destruction of the dentin follows-which undermines the covering enamel
Will ____ the occlusal surface
At the DEJ, the caries spread rapidly and ____ along the junction
darken
laterally
Caries Progression
At the DEJ, the cones of decay have a ____ relationship
base to base
Principles of cavity design/preparation
Outline form Cavosurface to include: All carious \_\_\_\_ All decalcified \_\_\_\_ All undermined \_\_\_\_ Posterior Occlusal Outline: Extend into the major developmental grooves \_\_\_\_mm
pits and fissures
enamel
enamel
1
