Dental Casting with PowerCast Burn Resin

In dental restorations, accuracy of the 3d printed restorations as well as the casting quality of the resin have crucial importance in order to reach an optimum restoration that fits perfectly in the patient's dental structure. 

PowerCast Burn is widely used in dental restorations with Metal Casting and Emax press for:

  • Crowns, Bridges
  • Partial denture frameworks
  • Inlays, Onlays, Laminate Veneers

Casting Tips and Burnout Cycle for PowerCast Burn Resin

Here we recommend a certain burnout cycle that is used by a dental lab, however please note that most of our customers uses different burnout and casting process. 

In order to have a quality casting, first and foremost, we recommend to follow carefully the specifications provided by the investment brand you are using. These includes:

  • Water-powder ratio (use a scale to measure the water and powder)
  • Mixing process and time
  • Time to leave the flask before inserting in the oven(average 35-45min)
  • Burnout cycle

Process of washing, drying before casting 

  • Wash your prints with ethyl alcohol (ethanol) - You can use 96% Ethyl Alcohol
    • The best way is to wash first 2-3 times by spraying ethyl alcohol and blowing dry air with a compressor.
    • Please do not leave print inside alcohol for a long time as this may increase the shrinkage of your prints afterwards.
    • Please do not use isopropyl alcohol as it is more reactive and ethyl alcohol would be much better to clean without reacting with the resin.
  • Do not need UV curing before casting. Post-UV curing is common for other resins but for PowerCast BURN resin it has a negative impact on the casting.

Preheating Cycle for Standard Metal Casting 

 Insert Flask/Cyclinder Room temperature  ºC Time
Minutes
Climb 0-300 ºC 15
Hold 300 ºC 15
Climb 300-550 ºC 16
Hold 550 ºC 20
Climb 550-750 ºC 20
Hold 750 ºC 15
Climb 750-940 ºC 20
Hold 940 ºC 30

 

 

Pouring metal after the last hold.

Preheating Cycle for Speed Metal Casting 

The most important difference for speed casting is the investment. Muffle is directly thrown into the furnace which reached 800 ºC in speed casting.

Insert Flask/Cyclinder Room temperature  ºC Time
Minutes
Climb 800-930 ºC  30
Hold 930 ºC 35

 
** Climb time 3-5 ºC per minute

Preheating Cycle for Empress and E-max

The cycle in below is for standard investments.

 Insert Flask/Cyclinder Room temperature  ºC Time
Minutes
Climb 0-400 ºC 15
Hold 400 ºC 25
Climb 400-700 ºC 15
Hold 700 ºC 20
Climb 700-850 ºC 15
Hold 850 ºC 20
Climb 850-940 ºC 15
Hold 940 ºC 25

 

The muffle is placed a heat-pressing furnace at 700 ºC. There are different models of press furnace and sample press furnace working curve is as follows.

Start temperature (ºC): 700 

Heat rate ( ºC/ min):           60

Final temperature (ºC):     870 

Hold time (min):                  20

Extra press time (min):         0

Maximum press time (min): 8

Then automatically the pressing unit activated. With a pressure of 4 bar pressing completed. Muffle at room temperature is allowed to cool. 

*This is an example from Zubler. 

 

Important Tips and Tricks !!

The end temperature of (870-940 ºC / 1598-1652 °F) is very important for a proper fit. 

Depending on oven size and calibration, the temperature may have to be adjusted, up and down.

Higher end temperature = wider fit

Lower end  temperature = tighter fit

 

General Investment Mixing Recommendations

Investment manufacturers usually ship their own liquid with their packages. However, it can be changed with these liquid settings according to the metal feature used. 

Below is an example of the liquid settings for Polyvest brand investment:

Small Muffle

1 package investment + 22 ml liquid + 14 ml water

Medium Muffle 

2 package investment + 43 ml liquid + 29 ml water

Big Muffle

3 package investment + 65 ml liquid + 43 ml water

Important Tips and Tricks !!

* Mixing time in the vacuum mixer is 60 seconds. This information may vary depending on the ambient temperature.

* Room temperature > 28 ºC, mixing time in the vacuum mixer: 40 seconds and investment poured into the mold in 20 seconds.

*  Room temperature < 28 ºC, mixing time in the vacuum mixer: 60 seconds and investment poured into the mold in 20 seconds.

* For liquid and water settings: 

Higher water = tighter fit

Lower water = wider fit 


*** Recommended revetments: Siladent, Nanovest, Sherafine, Polyvest etc. we are proud to hear that our resins compatible with all investments in the market.

Partial Dental Framework ( Upper and Lower Jaw )

Emax Press Laminate Veneers

Crown and Bridges


Metal Casted Examples