Class II. – modifications for
amalgam
 Compound cavity
 Slot
 Large defects - restoration with the
replacement of cusps
Occlusal cavity Proximal cavity
Slot is a cavity that is open
on occlusal surface only
in proximal ridge.
Slot for amalgam
 Access to the caries lesion
- go through the enamel wall
- breaking out of the enamel lamella
- excavation of carious dentin
lroubal@med.muni.cz 8
Pre op
lroubal@med.muni.cz 9
Access to the cavity
lroubal@med.muni.cz 10
Slot for amalgam
 Autoretention
- Grooves
- Divergency towards gingiva
- Convergency and divergency of axial walls
in horizontal plane
 Rule of the gingival wall
Slot for amalgam
 Rule of the gingival wall
90% angle towards the pulpal wall
outer line beveled if in enamel
horizontal groove
Sedelmayer
Sedelmayer J. Amalgám – zapomenuté řemeslo.
Brno, 2000.
Bažant V.
Konservační zubní lékařství, SPN Praha,1962.
Slot cavity
 Limited on proximal ridge
 Axial walls are divergent towards gingiva
 The proximal box has a typical picture of
fish tail
 There are grooves:
- One horizontal in gingival wall
- Two vertical in axial walls
Rules
 Clear and sharp outlines
 Autoretention
- Cavities - pins
- Grooves
Large amalgam restoration -
overlays

Preparation for adhesive
materials
 No extension for prevention (adhesion)
 No grooves
 No undercuts
 Rounded box
 Acid etching
 Priming bonding
 Placement of the material using matrices.
Cavity for amalgam
Cavity for composite
Sedelmayer
Alternative preparation - slot
Circular matrix, wedge.
Proximal wall is built first.
Sectional matrix, wedge, separator
Tunnel preparation
Glass ionomer
Composite
X-ray post op.