Class II. cavity preparation
Defects affecting one or both proximal surfaces of posterior teeth
Symptoms
> No symptoms
> Increased sensitivity (cold, sweet)
> Retention of foo
> Defect (carious lesion is open — the enamel is broken)
> Bite sensitivity (when carious lesion is open)
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Diagnosis
> Visual changes of tooth structure
> Transillumination
> Radiography
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4 stupňo grading
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Preparation - amalgam
the Blac
> Conventional preparation acc. to the Black's rules
> Slot preparation
> Large preparation — cusp(s) involved
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Preparation -  adhesive materials
> Conventional preparation for composites
> Adhesive slot
> Tunnel preparation
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Occlusal cavity Proximal cavity - box
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Isthmus
Access to the cavity
I
rom the occlusal surface
Through the undermined enamel
Sep
aration using wooden wedges is usef
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Cavity border and extention for
prevention
Proximal box:
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Retention
•cclusal cavity — auxilliary cavity
> Undercuts
> Grooves
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Autoretention
]'-'-"■.......:.....'i ■
Resistance
> No undermined enamel
> No sharp wedges
> Isthmus is 1/3 — 1/4 intercuspidal distance
> Angle between axial and gingival wall: 90°, or 85°
> Width of gingival wall is 1 mm at least
> Thickness of the filling 2 — 4 mm (4mm cusp replacing)
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Excavation of carious dentin
Rounded bur
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in enamel)
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Finishing of cavi
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Cavity control
> Goog light, miror
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Isthmus
Matrix placement
Matrix primarily is is to be restored
used wh
en a proximal surface
The objectives:
- Provide proper contact
- Provide proper contour
- Confine the restorative material
- Reduce the amount of excess material
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Matrices
> Ivory I retainer Ivory 1
> Hawe Neos retainer Ivor
> Tofelmire matix and retainer
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- tighten the matrix band
- compress the gingiva
- separate the teeth
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Wedging
> Slip the matrix band over the tooth )apical to the gingiva margin — 0,5, - 1 mm)
> Tighten the matrix, check it with probe
> Place a wedge
> Turn the retainer % counterclockwise
> Contour the band
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Condensation of amalgam
ondensor — stamen is the best one
Power driven condensation
How big the stamen should be??
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Base
ate cement late cement ement > Zinkoxideugenol
On pulpal walls only!
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Instruments
■ p
reparation
Fillim
Finishing and polishin
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