Alfa 25 - Användningsinstruktioner

Color:    WHITE
Type:    IV
PGM:    36,9%

Metal Content %

Pd    Ag    Ir    Sn    Zn
36.9    56    0,1    3,0    4,0


Modeling:    Minimum wax thickness: 0.3 to 0.4 mm. No sharp corners. Lingual eyelet rings help support castings during firing.

Single Crowns: Use direct sprues, 8-10 gauge, (3.3-2.6 mm diameter) and 1/2 in. (12 mm) long with adequate reservoirs.
Multi-Units and Bridges: 10 gauge (2.6 mm diameter) sprues 1/8 in. (3 mm)long.
There should be no more than 1/4 in. (6 mm) of investment from the top of the pattern to the top of the investment.

Alloy Quantity:    10.9 g/cm3 * (Wax Weight) = Required Alloy Quantity.

Investing:    Use debubblizer and blow off any excess before investing. Recommended Investment:Phosphate Bonded . Follow the manufacturer's instructions.

Burnout:    Place the rings in a room temperature oven and raise the temperature to 800 °C / 1470 °F for 1 hour plus 10 minutes for each additional ring. If you are using a rapid fire investment, follow the manufacturer's instructions.

Reusing Cast Alloy:    Use only clean buttons and at least 50 percent new alloy.

Crucible Type:    Ceramic

Torch Casting:    Use either a natural gas/oxygen or a propane/oxygen torch with a multi-orifice tip. Ensure that the flame is on a natural setting when casting. The fuel proportions should be one-part fuel to two-parts oxygen

Induction or Electrical Casting:    Use a ceramic crucible and a casting temperature of a least 1200°C. The casting temperature may require adjustment based upon the alloy quantity and the casting machine. Follow manufacturers instructions.

Cooling:    Allow casting ring to cool to room temperature. DO NOT quench in water.

Divesting:    Divest and sandblast with 50 micron aluminum oxide.

Finishing:    Grind the metal surfaces for porcelain application with non-contaminating aluminum oxide stones in one direction. Blast with non-recycled 50 micron aluminum oxide. Do not exceed a blast pressure of 4 bars or 60 psi. Clean in distilled water in an ultrasonic cleaner for 10 minutes.

Degas:    Degas at 700-800°C for a total of 5 minutes. The first 3 minutes should be in air and the final 2 minutes in vacuum. CAUTION! After this step avoid contact between the metal surface and fingers or other foreign object that could leave a contaminant deposit on the surface.

Presolder: Solder joints should be large (at least 5 mm²). Soldering gap about 0.05-0.2 mm. Invested units should be preheated and pressure blasted with 50 micron just before soldering.

Porcelain Application: Use only high expansion, low fusing porcelains especially adapted for universal alloys. Follow the recommendations of the porcelain manufacturer. For a better bond, fire a thin wash 10 - 15 °F (10 °C) above normal temperature, followed by regular opaque coats.

Post Soldering (After Firing): Solder joints should be large (at least 5 mm²). Soldering gap approximately 0.05 - 0.2 mm. Cover ceramically veneered units with wax before investing. The soldering investment should not come in contact with the ceramic.

Hardening:    Heat Treat for app. 15 min. at 550°C

Recommended solder:    Thor Light 700

Alldental Q & Co. AB                    CE 0413
Box 92001
Tel. +46-(0)8-694 80 25
Fax +46-(0)8-694 80 26