This invention relates to a periodontal structure mapping system employing a dental handpiece containing first and second acoustic sensors for locating the Cemento-Enamel Junction (CEJ) and measuring the differential depth between the CEJ and the bottom of the periodontal pocket. Measurements...http://www.google.de/patents/US5755571?utm_source=gb-gplus-sharePatent US5755571 - Differential measurement periodontal structures mapping system
