Ivoclar-vivadent PCT FlexVest User Manual download pdf (Page 2)

Instructions for Use

PCT FlexVest is a carbon-free, phosphate-bonded investment

material for precision alloy castings. PCT FlexVest can be used

with a conventional burnout technique or a rapid burnout

technique.

Indication

– Precious alloys

– Non-precious alloys

– Investing with a metal investment ring

– Ringless investment

Contraindication

– Pressed ceramics (e.g. IPS Empress)

Working procedures

Wax pattern

Fabricate wax patterns for crown and bridge frameworks.

Resin pattern

Coat patterns made of modelling resin with a thin layer of wax.

Spruing

Attach sprues of an appropriate dimension to the bridge

framework, using a direct or indirect method. (See Instructions

for Use)

Investing with a metal investment ring

Apply one layer of PCT Flex Vest Liner if metal investment rings

of sizes 1 and 3 are used and two layers if ring sizes 6 and 9 or

a non-precious alloy is used.

Slightly wet PCT FlexVest Liner. Absorb excess water by pressing

a piece of dry liner onto the wet material. Line the metal

investment ring with damp liner. Allow the liner endings to

overlap by approx. 0.5 cm. Next, press the liner into place. Make

sure that PCT FlexVest Liner is flush with the upper rim of the

metal investment ring. Carefully position the metal investment

ring lined with the PCT FlexVest Liner on the base former.

Note: Any wax surface tension releasing agent needs to be

completely dried off. Contact of the investment material with

surfactant may lead to incomplete setting and, consequently, to

uneven investment surfaces.

Processing procedure

Only use distilled water to modify the concentration of PCT

FlexVest Liquid/Liquid H.E. It is advisable to use a dosing syringe

to take the desired amount of liquid out of the container.

Note: No not use mixing liquid if it is crystallized.

The higher the concentration of PCT FlexVest Liquid/Liquid H.E.

is, the higher is the expansion rate of the investment material.

English

PCT

FlexVest

Concentration of mixing liquids

Alloys Ceramic Alloys C&B/BioUniversal

Alloys

PCT FlexVest Destilled PCT FlexVest Destilled

Liquid water Liquid water

High Gold and

reduced gold Alloys

60–80% 40–20% 50–60% 50–40%

Pd Base Alloys 70–80% 30–20% 70–80% 30–20%

Non precious Alloys

(Co Cr / Ni Cr)

80–100% 20–0% 80–100% 20–0%

Mixing ratio

60 g powder 13 ml mixture PCT FlexVest Liquid/Liquid H.E. //

distilled water

90 g powder 20 ml mixture PCT FlexVest Liquid/Liquid H.E. //

distilled water

160 g powder 35 ml mixture PCT FlexVest Liquid/Liquid H.E. //

distilled water

Note: The mixing ratios described above represent

recommendations. Adjustments may be required for various

alloys and casting techniques.

Mixing

Prior to blending the mixture, rinse a clean mixing bowl with

water. Place the premeasured PCT FlexVest Liquid/Liquid H.E. in

the mixing bowl. Add the preweighed powder to the liquid. Stir

the two components with a spatula to form a homogeneous

mixture. Place the mixing bowl in a vacuum device. Set the

vacuum value. After the set vacuum has been reached, mix for

90 seconds. After completing the mixing procedure, maintain the

vacuum for an additional 15 seconds and then flood the mixing

bowl manually.

Note: Mixing bowls that are not completely clean or severely

scratched can absorb up to 2 ml of mixing liquid. Extended

mixing times will result in smoother casting surfaces, similar to

gypsum-bonded investment materials for C&B casting alloys.

Investing Pour PCT FlexVest into the investment ring at a slow

and steady rate, using slight viration. Stop virating the

investment ring as soon as it has been completely filled.

Do not touch the investment.

Note: It is advisable to pour the most intricate and least

accessible parts of the pattern first to prevent air from being

trapped.

Working time

The working time is 5 minutes at a room temperature of

23 °C (73 °F).

Note: The powder and liquid should always be stored in a cool,

dry place. Reseal the container of the mixing liquid immediately

after use. The powder and mixing liquid should have the same

temperature when in use (ideally between 17 and 22 °C (63 to

72 °F).

Note: If the working temperature is > 24 °C (> 75 °F), the

setting expansion will increase considerably, while low working

temperatures of < 16 °C (< 61 °F ) result in a reduction in the

setting expansion.

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Ivoclar-vivadent PCT FlexVest User Manual Page 2

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