Dentsply Sirona Biodent K+B Plus/OVS II Mode D'emploi page 19

With thick crowns, an extra wedge of transparent material is laid palatally on the in cisal
area – with or without an admixture of enamel material (Fig . 3) . With veneers, the metal
frame must first be masked with opaque .
Neck Material
Take the work to be veneered, or the insulat ed die, off the model, if necessary, for layering .
Apply the material parallel to the shoulder or to the edge of the gum as shown in the
layering diagram (Figs 3–9) . Draw it up in the proximal area, as on the shade guide tooth .
In all layers, moisten the instrument with a touch of monomer .
Dentine material
Apply dentine material to the centre of the crown and spread it out . Press it lightly onto the
neck area but do not displace the neck material . Undercuts must be packed without forming
bubbles . In the incisal area the dentine is built up as with the original Biodent layering (Figs 6–9) .
Taper the dentine core off about 1 mm below the incisal edge and bevel off proximally and
incisally to a crescent shape . This is the stage at which the dentine core receives its final form .
Fig . 9: Formation of the dentine core .
Blending according to Biodent shade:
See Vita-Comparison of Shades .
Fig . 6: Biodent shades 15, 16, 17
Fig . 7: Biodent shades 21, 23, 31, 39, 41
Fig . 8: Blending for all other Biodent shades
Enamel material
This is built up in the incisal area and taper ed off towards the neck over the dentine .
Take the ready-modelled crown or veneer, with its die, off the model . Carefully remould, or
add more material to the edges and points of contact . With veneers, cover the edges with
plastic to get a good marginal fit .
Protective Varnish
Prevents penetration of the curing medium into the plastic and produces dense, smooth
surfaces . Do not use in cold curing. Let the work dry after modelling until the surface
looks matt . Then brush the varnish on . Leave for about 3 minutes before curing, until the
surface is no longer tacky . The drying time may be shortened by warming .
Protective varnish thinner: lf the protective varnish thickens after a time, it can be made
less viscous again with a few drops of the thinner (shake well) .
Curing
Leave in the vacuum-cure water bath for at least 15 minutes at 95 ° C; pressure: 6 bars .
Fig . 10
Do not exceed the curing temperature of 95 °C .
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