Diamond Systems Tritan Provozní pokyny stáhnout pdf (Strana 26)

autocast universal

230 Casting System Model casting Stand 1.9. 03 A 19

Preparation for investing

Contrary to the crown and bridge technique, removable

restorations are made with a model which has to be

invested in a ring. In order to avoid loss of pressure during

the casting process, there must be a tight bond between

the refractory model and the investment ring. Any deviation

form the recommended materials and procedures may

result in cracking of the ring due to the expansion characte-

ristics of the investment material.

This will result in miscasts.

Trimming the model before investing

The models are dry trimmed up to the waxed patterns.

The model should be 10–15 mm thick at the lowest point.

Models which are too thick are trimmed flat on the base

to dimensions.

For models which are too flat, refer to the section on

duplication, page A 9 .

The models for a full upper jaw are trimmed from the

front so that the model has a standing surface which is

angulated at 45°. Distance between the wax model and

standing surface approx. 4 mm.

Muffle ring of plastic (red, blue, green)

Choose the muffle ring according to the refractory model

size. The distance to the wax model should be at least

8–10 mm. Spread vaseline thinly over the inside of the

muffle.

Do not insert lining tape. Casting is done without the

muffle ring.

Place the muffle ring on the base plate and fix the position

of the model. Be sure the sprue cone is in the center of the

ring.

Fixation on the base plate

Seal the wax up refractory to the smooth ring base

(Ord.-No. 127-309-00) using sticky wax. Use a thin layer of

wax for fixing, in order to keep gap between model and

coat small. Full upper jaws are waxed onto the front side

of the model, which has been trimmed at an angle of 45°.

The sprue former must be centered perpendicularly in the

middle of the muffle. Press on the muffle ring.

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Diamond Systems Tritan Provozní pokyny Strana 26