Class II. - modifications
 Compound cavity
 Slot
 Large restoration with cusps
replacement
Kavita okluzální Kavita aproximální
MO, OD
MOD
Grooves in proximal box
A groove in gingival wall
Divergency of axial wall to the gingiva
Autoretention
Slot preparation
- Small slot
- Limited on proximal ridge
- No large cavity on occlusal surface
- Grooves
- Divergency of proximal walls
to the gingiva
Slot for amalgam
 Access to the caries lesion
- go through the enamel wall
- breaking out of the proximal enamel
lamella
- excavation of carious dentin
Slot
 Autoretention
 Rule of the gingival wall
Slot
 Rule of the gingival wall
90% angle towards the pulpal wall
outer line beveled if in enamel
horizontal groove
Slot preparation
 Indication: Small cavities, good level of oral
hygiene.
 Contraindication: Large cavities, high risk
of new caries lesions, bad level of oral
hygiene.
Large preparation with
replacement of cusps
Thickness of amalgam
on the cusp is 3 – 4 mm
Grooves
Pins
Slots
Slot
Parapulpal pin
Groove
Retention in endodontic cavity
Large amalgam restoration -
overlays

Composite materials and
class II.
 Indication: Aesthetic reasons, small to
moderate cavities, good level of oral
hygiene, isolation of operating field.
 Contraindication:
Large cavities, bad level of oral hygiene,
poor isolation of operating field.
17
Preparation for amalgam
18
Preparation for composite
material
19
Preparation for adhesive fillings
We do not bevel the cavosurface margin in occlusal cavity
20
Preparace
30 - 40°
Gingival wall
The cavosurface margin is beveled if situated in enamel
The cavosurface margin is not beveled if situated out of
enamel
21
22
Sedelmayer
Adhesive slot
Tunnel preparation
1. Magnification
2. Small instruments
3. Capsulated GIC or composite
5. X-ray post op
Small cavities
Inlays – class II.
 Rigid fillings – made in dental lab
 Luting into prepared cavity using cements.
 Material:
- Metal alloy (usu golden)
- Comosite material
- Ceramics
Inlays – class II.
 Indications:
 Large defects
 Low risk of new caries lesions
Inlay
Onlay
Overlay
Geometry of preparation
 Strict extension for prevention
 No undecuts, no grooves
 The walls are divergent to the occlusal
surface !!!
The angle
6 – 15°
Preparation
 For inlays made of the metal alloy the
cavosurface margin must be beveled.
 The depht of preparation when metal
alloy is used must leave the space for
inlay1,5 mm
 For inlays made of composite or
ceramics the cavosurface margin is not
beveled, the thickness of the material
must be appr. 3mm.
All this rulea are important for resistance
For inlays the impression must
be taken
 Elastomeric materials
 Register of intermaxillary relations
 impression of the antagonal dental arch –
alginate material.
Cementation of metal inlays – zinkoxidphosphate cement
Cementation of composite or
ceramic inlays – adhesive
cements
 These cements are based on composite
material.
lenka.roubalikova@tisc
ali.cz
47