“…Studies, the PMA and PI indices were used to Introduction express the extent of disease; m the latter sur-During the last ten years, a number of surveys veys, methods designed ad hoc by the inveshave been carried out in Israel, to investigate tigators were applied, the periodontal health of various sections of the population. In 1957, a representative sample of grade school children, 13-14 years Material and Methods of age, was examined (Rosenzweig 1960). A group of older (Talmud High School) stu-This report presents the findings concerning dents was examined in 1960 (Rosenzweig and the periodontal status of over 5,000 individ-Langer 1961), and two studies were carried uals, aged four years and over, belonging to out later on women of childbearing age (Erb nine different ethnic groups living in rural settand Brzezinsky 1963, Abrams Slome 1965.…”