Are Zirconia protheses harmless or dangerous for customer’s health? Zirconium is completely safe. It’s necessary to specify that this material is flammable, if used in powder. Nevertheless this doesn’t concern the dental prosthesis. Is zirconium oxide radioactive? Zirconium can be found in nature only as oxide (in the chemical formula ZrO2) or as silicate (in the chemical formula ZrSiO4). However it doesn’t exist as chemical element in nature. Natural radioactive impurities can be present inside it and, therefore, they need to be eliminated through modern purification procedures. Our industry follows ISO regulations, indicating the purity level which guarantees that the product is safe for human health. Once zirconium has been purified, it’s considered an inert element. Why is Free Sales Certificate necessary?Free Sales Certificate is required in order to export medical devices, produced in Italy, outside Europe. This certificate is issued upon request. How should be zirconium oxide’s disposal? Wastes should be disposed of according to the local, regional and state law in force. What is the suggested sintering cycle for translucent zirconium’s components? The sintering cycle suggested for DB+ LUX is around 1450°-1460 ° C. If the temperature is higher, the result won’t be a translucent zirconium. What is the multiplicative coefficient or shrinkage? In order to make a milling on a pre-sintered material is necessary, first of all, to know the dimensions of the final dental prosthesis. In case the method of the multiplying coefficient is used, each dimensions of the final prosthesis has to be multiplied by this coefficient. Its value is indicatively 1,250±0,007: each single lot has its multiplication coefficient specified on the package. In case of shrinkage percentage, whose formula is [ ( praesint. – sint.) / ( praesint.) ] * 100, each dimension of the final prosthesis has to be multiplied by the following value: 100 / ( 100 – shrinkage percentage), specified on the package for each single lot. The so obtained value (for each dimension, following one of the above methods) are the dimensions that the prosthesis must have, before its sintering in the kiln.