The success of dental operations with the use of implants mostly depends on the properties of the implant materials and their compatibility with the tissues of the human body. A number of physical compatibility criteria are known, which include biological stability, biocorrosion resistance, chemical stability, antimicrobial resistance, so an in-depth study of these criteria is relevant. Among the used implants, dielectric materials of natural and synthetic origin make up a large share. The peculiarity of such materials, in contrast to metal ones, is the ability to form, at a human body temperature of 310K, low-intensity electromagnetic radiation (EMR) of the microwave range, which interacts with the biotissue adjacent to the implant. Such EMR exerts an influence at the cellular level too. This effect of EMRin fact has not been investigated. The article discusses the physical basis of the formation of positive ("+") and negative ("-") microwave radiation flows that occur between the implant and the adjacent biotissue. By using a highly sensitive radiometric system, an experimental study of the radiation properties of the most used implant materials contacting with human body tissues was carried out. In the course of the research the levels of inherent radiation of a number of dental materials were determined, the calculation and evaluation of the coefficients of their radiation capacity was carried out. Comparing the radiation capacity of contacting dental materials with the level of radiation of the human body tissues made it possible to determine the level of their electromagnetic compatibility. Recommendations for the selection of the most used contacting dental materials based on the criterion of electromagnetic compatibility have been developed.