A process for treating periodontitis existing in the mouth of a patient having teeth with roots extending downwardly in the gums by using a scaler including a scraper with a cutting edge and a handle for the scraper. A dentist uses the scraper to remove tartar, concretions and necrotic root element from...http://www.google.se/patents/US4820153?utm_source=gb-gplus-sharePatent US4820153 - Process and apparatus for cleaning a tooth
