Bego BegoForm User manual

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BegoForm

Refractory die material for inlays, onlays and facets of ceramic

Partners in Progress

BEGO is an official co-partner of the German Olympic team

Beijing 2008

BegoForm

is a stump material developed on phosphate basis. The stumps are extremely resistant to edge tear, are smooth and accurate. Specific ceramic compounds of well-known manufacturers are suitable for inlays, onlays and facets.

Fields of application: Inlays, onlays and facets of ceramic compounds.

Physical data:

Standard values

Colour white Processing time at 20 °C approx. 3 minutes Initial set (Vicat test) at 20 °C 5

minutes Setting time 45–60 minutes Setting expansion 0.6% Thermal expansion 1% Hardness after 1 hour 200 [MPa]

Working instructions:

1. Duplicating with Wirosil Form a wax plate of a thickness of approx. 2 cm.

Press the basis of the original stump (for example Pin) into the wax, but not more than 3 mm below the preparation limit.

1.1 Cut a paper sleeve to correspond to the requested height, and stick together. Now put it over the stump and fix by wax.

1.2 Mix and fill the Wirosil according to the instructions. Then harden in the pressure unit at 4–6 bars or in the air for 30 minutes.

Using a pressure pot provides a higher security.

Important: If the Wirosil pressure unit, the stump as well has to set in the pressure unit under same pressure.

Then remove wax and separate stump from the duplicating form.

2. Production of a BegoForm

Pay attention to the processing time:

�

at 20 °C approx. 3 minutes Mixing ratio: 100 g /18 ml

�

Concentration of mixing liquid:

�

50% BegoForm®mixing liquid / 50% distilled water (see table 1)

duplicating silicone

mould sets in the

stump

Table 1

BegoForm®BegoForm®- Aqua dest.

mixing liquid

30 g (1 bag) 2.7 ml 2.7 ml

100 g 9

2.1 Spray the Wirosil with Aurofilm preparation liquid, and blow carefully dry.

2.2 Put the BegoForm bowl, add BegoForm®and mix briefly on the vibrator using a spatula.

Then mix by machine under vacuum (EasyMix mixers) for 1 minute or manually with a spatula for 2 minutes.

2.3 Pour mixed BegoForm duplicating mould on the vibrator.

Allow filled Wirosil harden in the pressure unit at 4–6 bars or in the air for 45 –60 minutes.

Important: If the Wirosil pressure unit, the stump as well has to set in the pressure unit under same pressure.

Remove the BegoForm duplicating mould.

ml 9 ml

duplicating mould

liquid in the mixing

in the Wirosil

duplicating mould to

mould sets in the

stump from the Wirosil

3. Preparation of the BegoForm

3.1 The BegoForm

stump has to be dried on the reeled-out burning table of the burning furnace for 10 minutes.

3.2 Preheat the BegoForm

stump in the ceramic furnace or preheating furnace at 650 °C for 15 minutes. Then heat to 1,000°C under vacuum and maintain final temperature for 10 minutes.

3.3 Allow the BegoForm

stump to cool down in the air. Then mark the preparation limits using the BEGO contour pencil. The marks will be heat-proof and well visible still after firing.

4. Application and firing of

ceramic compounds

4.1 Soak the BegoForm

stump before each operation. Dab excessive liquid by using a cellulose cloth. Application and firing of the ceramic compounds are made as per instructions of the manufacturers of the ceramic compounds.

5. Removal of the BegoForm

stump

After the last firing blast out the BegoForm stump with the help of the precision blaster (Duostar or EasyBlast) using Perlablast®micro at a pressure of up to 2 bars.

Availability:

1 carton = 1.2 kg = 40 bags of 30 g each

250 ml BegoForm

mixing liquid,

1 metering syringe Order No. 52785

stump

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BegoForm

Refractory die material for inlays, onlays and facets of ceramic

Partners in Progress

BEGO is an official co-partner of the German Olympic team

Beijing 2008

The preparation of the MOD inlay without thin terminal borders. The minimum thickness of the ceramic layer has been considered as well. This precision model is made of BegoStone.

Due to its high dimensional stability the addition cured two-component silicone

exactly reproduces the preparation.

Wirosil

The high refractability of the BegoForm

stump being true to the original enables the direct fusing of the ceramic compounds to the stump.

The preparation limit must be clearly visible. It is marked by a fireproof line using the BEGO contour pencil.

BEGO Bremer Goldschlägerei Wilh. Herbst GmbH & Co. KG · Wilhelm-Herbst-Str. 1 · 28359 Bremen · Tel. +49 421 2028-0 · Fax + 49 421 2028-100 · www.bego.com

The ceramist may be satisfied: Here the successful inlay impressive by its naturalness.

The inlay has a perfect marginal adaptation and can be inserted with safe conscience.

Warranty

Whether given verbally, in writing or by practical instructions, our recommendations for use are based upon our own experience and trials and can only be considered as standard values.

Our products are subject to a constant further development. Therefore alterations in construction and composition are reserved.