Ivoclar Vivadent Zenostar - Manual (Page 18)

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Sintering
Sintering is one of the most important processes in the manufacture of zirconia restorations for dental use. The sintering process
uses high temperatures to turn the porous "white body" into a densely sintered restoration. The material acquires its final properties
such as high strength and light transmitting capabilities only at this stage. To achieve ideal mechanical and optical properties, the
sintering process must be carried out using the specified sintering temperatures and times. The properties of the sintered restoration
will be adversely affected if the sintering temperatures are too high or too low or if the sintering times are too long or too short.
The Programat S1 sintering furnace from Ivoclar Vivadent and all the furnaces of the Zenotec range are specifically designed for
sintering Zenostar restorations. The furnaces feature various programs optimally geared towards the optical and mechanical
properties of zirconia materials and thereby ensure that the best possible results are achieved.
It is essential to observe the following notes when sintering zirconia restorations:
Restorations infiltrated with colouring liquid must be completely dry before they are sintered to prevent damage to the furnace
and/or object.
Generally, sintering beads are not recommended neither for the Ivoclar Vivadent Programat S1 sintering furnace nor the
furnaces of the Zenotec range.
Restorations must not touch each other during sintering.
Selecting the correct program is essential.
Always keep sintering auxiliaries clean and free of dust to avoid impurities in the sintered restorations.
Remove the entire RFID label before sintering to avoid stains in the restorations and contamination of the sintering auxiliaries
and furnace.
The sintering programs of the recommended sintering furnaces are shown below. Refer to the operating instructions of the
specific furnace you are using for detailed information.
Please note:
It is essential to use the appropriate sinter support structure for the appropriate furnace. Detailed information on the use of sinter
support structures can be obtained from the Zenostar Design Guidelines.