Burnout Furnace Buying Guide for Dental Labs
A burnout furnace is essential for pressing workflows — wax elimination, heat-pressing ceramic, and in some configurations, ceramic burnout for casting. Choosing the right unit means understanding what temperatures your workflow requires, how precise the temperature control needs to be, and what volume you're processing.
What Burnout Furnaces Are Used For in the Dental Lab
The primary use cases:
- Wax elimination (lost-wax casting): Heating invested patterns to burn out the wax before metal casting. Typically peaks at 750–900°C depending on the investment type.
- Heat-press ceramic (e.g., IPS e.max Press, Upcera Press): Requires precise temperature control at pressing temperatures, often around 910–930°C.
- Pre-heating casting rings: Maintaining ring temperature before introduction into the casting machine.
Note: burnout furnaces are distinct from sintering furnaces (which run much hotter for zirconia) and porcelain furnaces (which use radiant/vacuum firing for porcelain layering). Do not conflate them.
Key Specs to Evaluate
Temperature Range and Accuracy
For wax burnout alone, almost any furnace that reaches 900°C suffices. For heat-pressing, precision matters more — a ±5°C deviation at pressing temperature can affect the crystallization and final properties of the ceramic. Look for furnaces with stated accuracy and uniformity specs, not just a maximum temperature rating.
Chamber Size
How many rings or patterns can you fire simultaneously? High-volume casting labs need a large chamber to batch efficiently. Small labs or offices may prefer a compact unit with fast cycle times over large chamber capacity.
Atmosphere/Ventilation
Wax burnout produces fumes and volatile organic compounds. The furnace needs either a venting port (to connect to exhaust) or must be used under a ventilation hood. Some units have built-in catalytic converters or air injection to help combust the volatiles. Verify the installation requirements for your lab space before purchase.
Controller Interface
Programmable multi-segment controllers are standard on quality burnout furnaces. Look for the ability to store multiple programs — different investment manufacturers have different recommended burnout profiles, and you need the flexibility to follow them without manually adjusting temperatures mid-cycle.
Heating Element Type
Resistance wire elements are standard and work fine for wax burnout. For heat-pressing workflows, muffle-type furnaces (where the element surrounds a muffle chamber) offer better temperature uniformity. Silicon carbide elements offer faster heat-up and longer life at high temperatures but cost more.
Decision Matrix
| Use Case | Temperature Needed | Precision Needed | Recommended Spec |
|---|---|---|---|
| Wax burnout only | Up to 900°C | Moderate | Standard programmable furnace |
| Heat-press ceramic | Up to 960°C | High (±5°C) | Precision muffle furnace |
| Both | Up to 960°C | High | Quality precision unit with multi-program storage |
What to Avoid
Avoid generic ceramic kilns repurposed for dental use — they lack the precision programming dental workflows need. Also avoid buying used burnout furnaces without being able to verify calibration; element wear causes temperature drift, and a unit that was accurate when new may be running significantly hot or cold after years of use.
Nabertherm for Burnout
Nabertherm's dental burnout furnaces apply the same engineering precision the brand is known for in sintering. For labs that have already invested in Nabertherm for sintering, staying in the same ecosystem has practical advantages: familiar controllers, consistent build quality, and consolidated service relationships.