Periodontal diseases in Yan'an population in 1998,China

Objectives: The purpose of this investigation was to find out the status of Yan'an population's periodontal disease, which would be used as the reference data for Yan'an preliminary oral hygiene interference research .Methods: The base method for oral health investigation of WHO was adopted. Firtsly, subjects from every age section of Yan'an was selected and divided into six groups according to the age: 6-year-old, 15-year-old, 18-year- old, 35 to 44-year-old, and 65 to 77-year-old. Each group included 25 males and 25 females, while 12-year-old group has 50 males and 50 females. The examiner was professional dentist . Results:The incidence of gingivitis in children and adolesoences was higher and the number of periodontal healthy segment was larger. The older the age, the higher the incidence and the smaller the number. The prevalance of gingival blood is 13.35% for 12-year-old , 16.85% for 15-year-old , 19.13% for 18-year- old , 59.2% for 35-44-year-old and 31.51% for 65-74-year-old. Dental calculus index was 14.65% for 12-year-old , 26.74% for 15-year-old , 42.98% for 18-year- old, 54.49% for 35-44-year-old and 56.46% for 65-77-year-old .Periodontal pocket more than 4mm was 0.31% for 12-year-old , 3.19% for 15-year-old , 1.30% for 18-year- old, 12.17% for 35-44-year-old and 29.93% for 65-74-year-old. Conclusions: In conclusion,the incidence of periodontal diseases in this population is high,espically in the middle-aged and old-aged.In middle-aged people, gingivitis is more common.While in the old-aged,the incidence of perioddontitis is higher.