4 stupňo grading
Cavity border and extention for
prevention
Proximal box:
Axial wedees
Under the free gingiva
Occlusal
Class I. cavity preparation
La
Zásada retence
> Kotvení pomocnou kavitou na žvýkací ploše kotvení na rybŕ
IUI
Obráceně divergentní preparací kavity aproximální
Preparace rýh a zářezů
lroubal@med.muni.cz
Resistance
No undermined enamel No sharp wedges
Isthnus is 1/3 — 1/4 intercuspidal distance
Anglebetween axial and gingival wall: 90° or 85°
Thickness of the filling 2 — 4 mm (4mm cusp replacing)
lroubal@med.muni.cz
> Matrix primarily is used when a proximal surface is to be restore
The objectives:
-   Provide proper contact
-   Provide proper contour
-   Confine the restorative material Reduce the amount of excess material
lroubal@med.muni.cz
Wedging
Slip the matrix band over the tooth) apical to the
gingiva margin — 0,5, - 1 mm)
Place a wedge Turn the retainer % counterclockwise Contour the band
lroubal@med.muni.cz
Carver Sapin