Class V.
vity Preparation
Anatomical xxlinical crown
Anatomical crown - cementům- enamel junction
Clinical crown - gingival border
Cervfóalarea
Predictable dirty place
Nearness of gingiva - possibility^ its injury, bleeding, inflammation
Flow of the sulcular liquid
i          "->   Difficulties with the maintenance of the dry field
Specific ordering of the hard dental tissues
£>     Také into account
Access Info^The Cavity
Elimination od the undermined enamel
Burs or diamonds (pear), tapered fissurej^ur
Separation of the gingiva- temporaryiilling guttapercha, fermit, clip, zinkoxidsulfate cement, cavit, provimat).
Ablation of ingrown gingiva - surgical (scalpel, laser, high frequency current)
V.CIassTKmalgam
Posterior area
Determination of cavity borders ancľextention for
We do not follow Black's rules exactly! Gingival: axial dephth of 0,5 mm inside the
Extention of the preparation incisally, gingivally, mesially and distally untill the cavosurface margins are positioned in sound dentai structure. Total dephth: 1-1.25 mm. If on root surface -0,75 mm
'cisal border
Mesial snd distaj border
Gingival border
7
"ikluzální okraj kavity Pod maximální konvexitou zubu
a distální ^ okraj kavity Do axiálních hran
>
Gingivální okraj kavity Pod okraj gingiv> ale i supragingiválně
Retention
► Box 0,75 - 1,25 mm deep, un coves (larger cavities)
Resistance
Elastic deformation during the bitin
Excavation oftsarious dentin
Round bur
Excavator
Fine diamond bur of a chisel
Portion of amalgam are condensed using a
condensor (stamen) and finished using a spatula or a carver.
Class five
Aesthetic reasons
^composite
Access Info^The Cavity
• Elimination od the undermined enamel - Burs or diamonds (pear), tapered fissure bur
• Separation of the gingiva- temporary filling guttapercha, fermit, clip, zinkoxidsulfate cement, cavit, provimat).
• Ablation of ingrown gingiva - surgical (scalpel, laser, high frequency current)
Composite must not be subgingival!!!!
Determinationötcavity borders
Cavity is limited on the caries dei no extention!!!!
The depth usually 1 mm
Retention
> Micromechanical retention
Enamel:    Retentive border — 1 - 2 mm wide
and the angle 45°
Cementům: only finishing with the fine
diamond bur.
Retention
Retentive border:
-  removing of the aprismatic enamel
- better condition for micromechanical retention
- better aesthetics
Retention
Acid etching (phosphoric acid) 30 s enamel
Rinsing (washing off) 30s Priming, bonding, light curing.
Spatula
Matrix
- Polyester strip, wooden wedges
- Special cervical matrix
Matrix
Anatomical form
-■
*v

Class five M3Jasionomer
Cavity outside of enamel
Properties
>  Chemical fixation to tooth structure
>  Fluoride release
>  Favorable thermal expansion
>  Aceptable aesthetics
Determinationötcavity borders
Cavity is limited on the caries dei no extention!!!!
The depth usually 1 mm
> Box
> Chemical
Btention
Fine diamond bur
> Conditioner 20 s
> Washing off
> Wet cavity
> Filling material
> Matrix
> Varnish
Sandwich
principle
Base of galsionomer - replace of the lost dentin
Thin layer of composite - replace of the lost enamel
Composite
Base
Bond: GIC - Tooth Chemical
Composite - Tooth Micromechanical
Composite - GIC Micromechanical
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