THE ARGEN CORPORATION

Alloy Specification Sheet

GOLDTECH BIO 2000

Color: RICH YELLOW Type: 0 ADA Classification: HIGH NOBLE (HN) PGM: 99.7%

Metal Content %

Au In Zn
99.7 x x

'x' denotes a content of less than one percent.

Thermal Properties

Melting Range
Casting Temperature

Coefficient of Linear Thermal Expansion

( um/m-ºC )

1885-1960ºF
2190ºF
25-500
25-600
1030-1070 ºC
1200 ºC
15.5
15.7

 

 

 

 

Mechanical Properties

Vickers Hardness

(VHN)

Yield Strength

(0.2% Offset)

Modulus of Elasticity

(GPa)

Elongation

( %)

Density

(g/cm³)

A.F.
Soft
Hard
A.F.
Hard
77
A.F.
Hard
19.2
35
---
---
2,000 psi
--- psi
50
---
14 MPa
--- MPa

 

 

 

 

 
GOLDTECH BIO 2000 should only be used for single units and three-unit bridges from the second bicuspid forward. Full porcelain coverage is required.
   
PROCESS
INSTRUCTIONS FOR USE

WAXING

Wax for proper porcelain support. A minimum wax thickness of 0.2 mm is recommended. For single units use direct sprues with reservoirs. For three-unit bridges use a "hollow" pontic (provided) with the indirect spruing technique. Additional detailed instructions are available for three-unit anterior bridges.

View Bridge Technique

View Single-Unit Technique


INVESTMENT A low heat, gypsum based investment is preferred, but a high heat, phosphate based investment may be used. Cover top of pattern with no more than 1/4" (6 mm) of investment.

BURNOUT For gypsum investments, use the manufacturer's recommended burnout temperatures and technique. Phosphate invested units should be burned out at a maximum of 1450F (790C), using a two-stage burnout procedure. A rapid-fire technique may be used following manufacturer's instructions.

CASTING Melt with a gas/oxygen torch with a multi-orifice tip. For automatic machines the casting temperature is 2200F (1200C). A carbon crucible or liner may be used. Use no flux during casting. Add 35% new alloy to clean buttons.

DIVESTING Divest castings carefully. Do not tap buttons or strike the investment, you may distort the casting. Remove investment by lightly blasting with unrecycled white 50 micron aluminum oxide at less than 30 psi / 2 Bars. Traces of investment may be removed using hydrofluoric acid or acid substitute in an ultrasonic cleaner for 5-10 minutes. Ultrasonic 5 minutes in distilled water.

FINISHING

If acid was used, it is not necessary to grind the entire casting. Grind porcelain-bearing surfaces as needed with fine crosscut carbide burs used at slow speed, which will cut the metal without "pushing" it. If acid was not used, prepare entire casting surface with carbide burs. DO NOT BLAST, DO NOT STEAM CLEAN. Ultrasonic in distilled water for 5 minutes. Blot dry with a tissue.


DEGASSING Place units in a preheated furnace at 1100F (600C) and raise the temperature to 1800F (980C) in air, hold for 5 minutes. DO NOT REMOVE OXIDE.

OPAQUE For powder opaque, fire a thin wash of opaque 10-15F (6-9C) higher than the normal firing temperature. For paste opaque, pre-dry 5-10 minutes on a heat source prior to firing.

PORCELAIN APPLICATION

Follow the recommendations of the porcelain manufacturer.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.

We recommend drying paste opaque from the inside out; this is done by utilizing a hot plate. The units are placed on a honeycomb sagger tray with metal pins. This is placed on top of the burner set a low to medium setting ( approx. 250°F ).it will take approximately 8-10 minutes or until the opaque turns chalky white or flat color. Then place in furnace for entry and maturing.


NOTE:

A light internal blasting at less than 30 psi / 2 Bars before glazing will enhance the golden color. Aluminum oxide blasting results in a matte finish. Blasting with glass beads results in a shiney surface.


SPECIAL NOTES FOR BRIDGEWORK

OPAQUE Apply a wash of opaque to the framework and fire 10-15F (6-9C) higher than normal opaque firing temperature. Prepare a 50% powder opaque: 50% dentine mixture to fill the hollow pontic. Cut into the center of the hole with a sharp blade to allow for shrinkage, and apply first opaque to framework. Fire normally. A second application may be necessary to fill in all shrinkage voids.

PASTE OPAQUE Opaque the entire bridge, including the hollow pontic. Pre-dry and fire as above. Fill pontic with powder opaque-dentine mixture and fire as above. If no powder opaque is available, use opaceous dentin. Re-apply and fire mixture as needed. Apply second coat of paste opaque to entire bridge, pre-dry and fire normally.

PORCELAIN Apply and fire porcelain normally. The first buildup should utilize interproximal cuts down to the opaque to lessen the potential for distortion of the framework due to shrinkage of the porcelain. A second porcelain application will fill in interproximal openings.

16-Apr-2009