lass V.
Cervfô
			
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area			
Caries risk place
Nearness of the gingival border - possibility of its injury, bleeding, inflammation
Flow of the sulcular liquid
Specific ordering of the hard dental tissues
Difficulties with the maintenance of dry operation field
The pulp chamber can be opened easily
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Enamel
Cementům
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Anatomical xolJni
a I crown
DEJ
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*
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Access
Elimination of the undermined enamel
Burs or diamonds (pear), tapered fissure b
Separation of the gingiva-temporary filling guttapercha, fermit, clip, zinkoxidsulphateat cement, cavit, provimat).
Ablation of ingrowing gingiva-surgical(scalpel^ laser, highfrequencycurrent)
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lenka.
Class Vľ^amalgam
Posterior area
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Outlin
We do not follow the Black's rules exactly!
Gingival: axial dephth of 0,5 mm inside the
DEJ (subgingival)
Extention of the preparation incisally,
gingivally, mesially and distally - see the following picture.
Total dephth: 1 -1.25 mm. If on root
surface only - 0,75 mm
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Mesial Wall
Wall
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»cclusal
and dis border
Gingival border
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1

Retention
Box with undercuts cca 0,75 deep
[. f'Ji ? ■ '■■"-. --jr" -f ■ '4'" *f  k
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Resistance
There is no direct loading with bite forces
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Excavations!carious dentin
Round bur Excavator
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Finishing
Smooth borders, enamel must be with dentin
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Portion of amalgam are condensed using a condensor(stamen) and finished using a spatula or a carver                        ^
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ClassV^Qomposite Indications
Aesthetic reasons
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ClassV^composit Contraindications
>    Dry operations field cannot B^kept
>    Subgingival margins
>    Poor oral hygiene
>    Root caries
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Access
Elimination of the undermined ename
-Burs ordiamonds(pear), tapered fissure b
Separation of the gingiva-temporary fillin guttapercha, fermit, clip, zinkoxidsulhate cement, cavit, provimat).
Ablation of ingrown gingiva-surgical(scalpel, laser, highfrequencycurrent)
Composite must not be put subgingival!!!!
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Outlines
Cavity is limited on the caries defec no extention!!!!
The depth usually 1 mm
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Retention
> Retentive border: 1-2 mm wide, bevel
45°.                                        ^
> Acid etching (phosphoric acid) enamel, 10s dentin
> Priming, bonding
-20
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Resistance
There is no direct loading with bite fo
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Excavations!carious dentin
Round bur Excavator
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Finfehjng
Retentive border: -removing oft aprismatic enamel n
Better conditions for retention
Better aesthetics
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Cavity outside of enamel
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• Benefits
>  Chemical bonding
>  Release F"
>  Favorable thermal expansion (similar to dentin)
>  Acceptable aesthetics
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Outline
Cavity is limited on the caries de no extention!!!!
The depth usually 1 mm
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Retention
Box - mechanical
Chemical - the cavity must be treat the conditioner (25% acrylic acid, 20 s wash afterwards)
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Resistance
There is no direct loading with bite forces
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Finishing
Fine diamond bur — smooth borders
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Seauencesötoperations
Conditioner 20 s Washing off 20s Wet cavity Filling material Matrix Varnish
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Matrices
Important for the correct shapbxof fillings For good curing of materials Strip or a special form
-   i
f. - Sandwich principle (combination of GIC and
composite
• Base of glassionomer- a replace of the lost dentin                                             ^
• Thin layer of composite-a replace of the lost enamel
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Composite
base of a glasionomer
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Bond:
GIC\tooth chemic°
Composite-toot micromechanical
Composite-GIC micromechanical
B.
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