Ivoclar Vivadent Zenostar - Manual (Page 37)

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Liner firing
For the Liner firing, please observe the instructions of the manufacturer of the veneering ceramic system.
Wash firing (Foundation)
Due to the low heat conductivity of zirconium oxide, a Wash firing procedure is required. The Wash firing ensures controlled
sintering of the ceramic onto the framework surface and enables a homogeneous bond to the framework/liner. Proceed as follows:
Mix the respective Dentin material with the recommended liquid.
Apply the Wash in a thin coat on the entire framework or the fired liner layer.
Position the restoration on the firing tray and fire it according to the stipulated firing parameters.
Fire the Wash with Dentin or Deep Dentin using the stipulated firing parameters