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
Large amalgam restoration -
overlays

Rules
 Clear and sharp outlines
 Autoretention
- Cavities - pins
- Grooves
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
Tunnel preparation
1. Low caries risk
2. Proximal ridge without infrac
3. Good cooperation
4. D2
1. Loups or microscope
2. Miniinstruments
3. Dezinffection
4. GIC in capsules
Success?
Success
1. Nízké riziko sklonu k novým kazům
2. Spolupracující pacient
3. Okrajová lišta bez infrakcí
4. D2 – D3
1. Lupové brýle nebo mikroskop
2. Miniaturní instrumenty
3. Dezinfekce kavity
4. Jedině GIC v kapslích
5. BW post op
Úspěch tunelu????
Úspěch tunelu????
Large amalgam restoration -
overlays

Rules
 Clear and sharp outlines
 Autoretention
- Cavities - pins
- Grooves