Ivoclar Vivadent SR Nexco Paste - Manual (Page 20)

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modEL ISoLatIon
Applying the sealer
fabricate a master model or a model with detachable segments according to the impression in the usual manner. Expose
and mark the preparation margins. Block out undercuts with blocking-out wax or blocking-out resin to ensure that the
restoration can be removed after the polymerization process without damaging the die. Basically, the application of a
sealer is recommended to harden the surface and to protect the stone die. However, the sealer layer must not result in
any changes of the dimensions of the stone die. It is not mandatory to utilize a spacer, as two coats of Sr model
Separator will be applied. If you use a spacer, check as to whether it is compatible with Sr model Separator.
Sealing the dies and adjoining parts of the model
Sr model Separator is applied in two thin coats. apply the first coat generously and make sure that all areas of the die
are well covered. Watch out for sharp edges (incisal edges) in particular. allow the layer to react for 3 minutes. after the
reaction time, apply a second layer in a thin coat, invert the model and allow to dry for 3 minutes. additionally, apply
Sr model Separator to adjoining model surfaces that may come into contact with Sr nexco including counterbite, allow
to react for a short time, and then disperse excess material with oil-free compressed air.
aPPLyInG tHE LInEr
Extrude the desired amount of the ready-to-use Liner paste from the syringe and spread it out slightly on the mixing pad
using a disposable brush. first, apply the Liner thinly on the die surfaces. make sure to fully cover all areas, as the Liner
provides an essential bonding surface to the luting composite. the Liner layer must be at least 150 µm thick and has to be
precured for 20 seconds per segment using the Quick.
framework-free restorations (anterior crown)
Fabrication of a die coated with sealer as the working basis
Apply the Liner in a minimum layer thickness of 150 µm. Precure each segment for 20 seconds using a Quick curing light.
Applying two layers of SR Model Separator