Ivoclar Vivadent IPS PressVEST - Manual (Page 4)

4
Investment
– Mix max. 400 g investment material in one go.
– Closely observe mixing ratio!
– Investment is carried out on a shaker under slight vibration. Allow the investment ring to set without
manipulating it.
Some aspects influencing the setting expansion of the investment material
– Temperature of the investment material and the liquid
– Residual water in the mixing cup, atmospheric humidity
Preheating / holding times
Starting temperature Room temperature
Temperature increase 5 °C / 41 °F per min
Holding time 30 min at 250 °C / 482 °F
Holding time after reaching
the final temperature (850 °C / 1562 °F)
100-g investment ring – min. 45 min
200-g investment ring – min. 60 min
300-g investment ring – min. 90 min
If more than 2 investment rings are preheated at the same time, the holding time at the final temperature
has to be prolonged by 15 minutes per additional investment ring.
Preheating of ingots and Alox plungers
IPS e.max ® Press / IPS e.max ® ZirPress / IPS InLine ® PoM
Ingot No preheating
Alox plunger No preheating
IPS Empress ® Esthetic
Ingot Preheating
Alox plunger Preheating
IPS One-Way-Plunger No preheating
IPS Empress ® Cosmo
Ingot No preheating
Alox plunger Preheating
Important information
– Do not use a debubblizer (tenside). Reactions with the investment material may occur.
– Consistent results can only be achieved under consistent conditions and if the Instructions for Use are
observed.
– Dilute liquid exclusively with distilled or de-ionized water.
– Liquid concentration: The more distilled or de-ionized water is added to the mixing liquid, the lower the
setting expansion. Do not dilute the liquid to below 50%.
– Use only dry, clean instruments to process the investment material. Do not use plaster mixing cups.
– Carefully cut open the powder bags and remove the entire contents of the bags.
– The stipulated minimum setting and holding times must be closely observed.
– Do not invest under pressure since this changes the product properties.
– Do not invest over the weekend (risk of cracks and press flashes).
To ensure thorough heating of the investment rings in the preheating furnace, the following points
have to be observed:
– Always place the investment rings into the cool preheating furnace.
– Load the preheating furnace to maximally half of the available utility space.
– Always place the investment rings in the rear part of the preheating furnace.