Investigation of periodontosis with periodontitis: literature survey and findings based on ABO blood groups.

Abstract

GENETIC AND EPIDEMIOLOGIC STUDIES OF ORAL CHARACTERISTICS IN HAWAII'S SCHOOLCHILDREN: I. CARIES AND PERIODOTAL DISEASE Chung, C. S., Runck, D. W., Niswander, J. D., Bilben, S. E . , and Kau, M. C. W. J. Dent. Res. 49:1374, 1970 Caries and periodontal disease were assessed among 9,912 children, 12-18 years old, using the D M / D M F ratio, DMF teeth and caries-freeness indices for caries, and the PI index for periodontal disease. Caries was more prevalent among the Japanese, Korean, and Hawaiian children followed by the Chinese. Children of Caucasian, Puerto Rican and Filipino origin showed the lowest caries incidence. The effects of maternal influence or genetic recombination were not significant. With oral hygiene taken into consideration, Hawaiian children showed higher periodontal scores than the other racial groups. The hybridity of the child when major racial crosses were involved showed a significant effect on the periodontal scores which suggested the importance of recessive genes causing higher risk of periodontal disease. School of Public Health and Department of Genetics, University of Hawaii, Honolulu, Hawaii 96822, U.S.A. DETERMINATION OF GROWTH RATES BY TETRACYCLINE LABELING IN YOUNG GUINEA PIG MANDIBLES Soni, N. N. J. Dent. Res. 49:1099, 1970 Tetracycline was administered orally to 22 male guinea pigs ranging in age from 14 to 64 days. The animals were separated into four groups according to age, sacrificed in pairs two days following the last dose of tetracycline, and the mandibles were prepared for histological examination. The results showed that in younger age groups (17 to 57 days) the labeling was highest in the molar regions, followed by the second molar, last molar, and incisal regions. In the older age groups (27 to 62 days) highest labeling was present in the second molar region, followed by the last molar and the incisal area. Labeling of the first molar region was 1.35-2.00 and 1.10-1.25 times greater than the incisal and second molar regions respectively; while labeling in the second molar region was 1.05-1.69 times higher than the incisal region. All results were statistically significant at the five percent level. Department of Oral Biology, College of Dentistry, University of Iowa, Iowa City, Iowa 52240.