The Ceramill Therm is high-temperature furnace that is utilized for the sintering of zirconia frameworks that are distortion-free. The constant temperature control and even temperature distribution ensure maximum reliability throughout the process. In order to fully utilize the furnace space, there are two stackable sintering bowls. The device can be operated from four sintering program locations, one of which is programmed by the user. Different restoration sizes will be reliably processed due to the fully automated sintering programs. This high performance device has a built-in safety feature which notifies the user when the sintering program has been unexpectedly terminated, such as with a power failure.