Class V.
Characteristic
 Cervical defects
 - carious
 - non carious lesions
Anatomical x Clinical crown
Anatomical x clinical crown
 Anatomical crown
 - cementum- enamel junction
 Clinical crown – gingival border
anatomical x clinical crown
Anatomical crown
The border is cemento-enamel
junction
Clinical crown
The border is gingival border
Cervical area
 Caries danger area
 Gingiva - possibility of its injury,
bleeding, inflammation
 Flow of the sulcular liquid
 Specific ordering of the hard dental tissues
Difficulties with the maintenance of the dry field
Take in account
Hard dental tissues in cervical area
On the surface can be
Enamel
Cementum
Dentin
Risk of opening of
the pulp chamber
Access to the cavity
 Elimination od the undermined enamel
- Burs or diamonds (pear), inverted cone bur
 Separation of the gingiva– temporary filling
 Ablation of ingrown gingiva – surgically
V.Class
Amalgam
 Posterior area
Cavosurface margin
We do not follow Black´s rules exactly!
Gingival: axial dephth of 0,5 mm inside the
DEJ.
Extention of the preparation incisally,
gingivally, mesially and distally untill the
cavosurface margins are positioned in sound dental
structure. Total dephth: 1 – 1.25 mm. If on root
surface -0,75 mm
Gingival border
Mesial
snd distal
border
Incisal border
Gingival border
below the gingiva
0,5 mm
Mesial and distal
borders – axial
walls
Occlusal margin
Below the max.
convexity
Retention
 Box 0,75 – 1,25 mm deep, undercuts,
Excavation of carious dentin
Round bur
Excavator
Finishing of cavity margin
 Fine diamond
Filling
 Portion of amalgam are condensed using a
condensor and finished using a spatula or a
carver.
Class V.
Composïte
 Aesthetic reasons
It is necessary: good oral hygiene
margin mostly in enamel
Contraindication of composites
 Bad oral hygiene
 Subgingival cavities
 Root caries (outside of enamel)
Access to the cavity
 Elimination od the undermined enamel
- Burs or diamonds
- Separation of the gingiva– temporary filling
 Ablation of ingrown gingiva – surgically
Cavosurface margin
Cavity is limited on the caries defect only –
no extention!!!! The depth usually 1 mm
The gingival wall must not be subgingivally.
Retention
 Micromechanical retention
Enamel: bevel - the angle 45°
Prepare the retentive border (shallow groove)
Cementum: only finishing with the fine
diamond bur.
Retention
Bevel and retentive border (shallow groove):
- removing of the aprismatic enamel
– better condition for micromechanical retention
- better aesthetics
Retention
Acid etching (phosphoric acid): 10 s dentin,
30 s enamel
Washing 30s
Priming,
Bonding
Light curing 10 – 20 s.
Filling
Spatula
Matrix
- Polyester strip, wooden wedges
- Special cervical matrix
Matrix
Transparent cervical matrix
Belvedere matrix
Class V.
Glassionomer
cavities that are not
Situated in enamel
anterior as well
as posterior area
Properties
 Chemical fixation to tooth structure
 Fluoride release
 Favorable thermal expansion
 Aceptable aesthetics
Determination of cavity borders
Cavity is limited on the caries defect only –
no extention!!!!
The depth usually 1 mm
Retention
 Box
 Chemical
Finishing of cavity margin
Fine diamond bur
Filling
 Conditioner (based on polyacrylic acid 20 s)
 Washing off
 Wet cavity
 Filling material placed in one bulk
 Matrix
 Varnish
Class V.
Sandwich filling
Base is made of galsionomer – replaces of the
lost dentin
Thin layer of composite – replaces the lost
enamel
Base
Composite
Bond:
GIC - Tooth
Chemical
Composite – Tooth
Micromechanical
Composite - GIC
Micromechanical