The invention relates to a polymerization and post-tempering device (10) fortempering, inparticular post-tempering, dental restoration parts (54) made of polymerizableplastics. At leastone light source (38) which emits light in the visible and/or ultravioletwavelength range and alight chamber with a door (14) to the light chamber are provided. The door(14) comprises awindow (20) with a window pane (22) which consists of at least two layers (56,58) whose layerfacing the light chamber reflects at least 90%, in particular approximately95%, of light, andwhose layer facing away from the light chamber filters out UV light and/orblue light.
