to say at the position at which the axis 28 meets the bottom or floor 16 i e it is colder than the 900 u00b0 isotherm in this respect especially during the quick heating operation a significant temperature gradient exists and the position adjacent to the dental restoration part that is to be inserted is at its coolest fig5 on the other hand inventively illustrates the same temperature profile with the heat conducting element 50 being inserted also in this case the radial outer part of the firing space 12 is beyond the 1200 u00b0 isotherm since at this position the heating device 22 is provided the heat radiation introduced however to a large extent is absorbed by the black and well heat conducting disk like plate that forms the heat conducting element 50 due to this it is even somewhat warmer at this position than above the plate or at the upper end of the firing space 12 this finds expression via the opposite inclination of the isotherms compared to fig4 that accordingly extend from the bottom left to the top right i e not from the bottom right to the top left as it is the case in fig4 moreover the distance between the isotherms in the inventive embodiment according to fig5 is substantially larger than it is the case with conventional furnaces according to fig4 which means that a significantly improved temperature homogenization is effected the position at which the dental restoration part is introduced later is approximately located on the 1100 u00b0 isotherm so that the temperature.