References
- Arnö A., Schei O., Lövdal A., Waerhaug J. Alveolar bone loss as a function of tobacco consumption. Acta Odont. Scand. 1959; 17: 3
- Ash M.M., Gitlin B.N., Smith W.A. Correlation between plaque and gingivitis. J. Periodont. 1964; 35: 424
- Basu M.K., Dutta A.N. Report on prevalence of periodontal disease in the adult population in Calcutta by Ramfjord's technique. J. All India Dent. Ass. 1963; 35: 187
- Brandtzaeg P., Jamison H.C. A study of periodontal health and oral hygiene in Norwegian army recruits. J. Periodont. 1964; 35: 302
- Chawla T.N., Chaudhry K.P. Dental health survey of medical students. J. All India Dent. Ass. 1957; 29: 165
- Chawla T.N., Nanda R.S., Mathur M.N. Bacterial plaque and its relation to periodontal disease. J. All India Dent. Ass. 1959; 31: 121
- Chawla T.N., Nanda R.S., Mathur M.N. Prevalence of periodontal disease in urban Lucknow (India) using Ramfjord's technique. J. All India Dent. Ass. 1963; 35: 151
- Cheraskin E., Ringsdorf W.M., Setyaadmadja A. T.S.H., Barrett R.A. An ecologic analysis of gingival state: effect of prophylaxis and protein supplementation. J. Periodont. 1968; 39: 316
- Frandsen A., Pindborg J.J.P. Tobacco and gingivitis. III. Difference in the action of cigarette and pipe smoking. J. Dent. Res. 1949; 28: 464
- Gopalan C. Protein malnutrition, J.C. Waterlow. University Press, Cambridge 1955
- Greene J.C. Periodontal disease in India: Report of an epidemiological study. J. Dent. Res 1960; 39: 302
- Greene J.C., Vermillion J.R. The simplified oral hygiene index. J. Amer. Dent. Ass. 1964; 68: 7
- Gupta O.P. An epidemiological study of periodontal disease in Trivandrum. India. J. Dent. Res. 1964; 43: 876, Suppl. Abstract.
- Herulf G. On the marginal alveolar ridge in students. Acta Genet. 1951; 2: 256
- Heylings R.T. A study of the prevelence and severity of gingivitis in undergraduates at Leeds University (1960). Dent. Pract. 1961; 12: 129
- Holmes C.B., Collier D. Periodontal disease, dental caries, oral hygiene and diet in Adventist and other teenagers. J. Periodont. 1968; 39: 100
- Jamison H.C. The relationship between the periodontal index and other indices. Int. Dent. J. 1968; 18: 586
- Lindhe J., Koch G., Månsson U. The effect of supervised oral hygiene on the gingival of children. J. Periodont Res. 1966; 1: 268
- Littleton N.W. Dental caries and periodontal disease among Ethiopian civilians. Public Health Rep. 1963; 78: 631
- Löe H. Epidemiology of periodontal disease. Odont Foren T 1963; 71: 479
- Löe H., Silness J. Periodontal disease in pregnancy. I. Prevalence and severity. Acta Odont. Scand. 1963; 21: 533
- Löe H., Theilade E., Börglum Jensen S. Experimental gingivitis in man. J. Periodont 1965; 36: 177
- Marshall-Day C.D., Shourie K.L. Roentgenographic survey of periodontal disease in India. J. Amer. Dent. Ass. 1949; 39: 572
- Mehta F.S., Sanjana M.K., Barretto M.A., Doctor R. Relation of betel leaf chewing to periodontal disease. J. Amer. Dent. Ass. 1955; 50: 531
- Pindborg J.J. Tobacco and gingivitis. J. Dent. Res. 1947; 26: 261
- Pindborg J.J. Gingivitis in military personnel with special reference to ulcero-membranous gingivitis. Odont. Foren. T. 1952; 59: 403
- Ramfjord S.P. Indices for incidence and prevalence of periodontal disease. J. Periodont 1959; 30: 51
- Russell A.L. A system of classification and scoring for prevalence surveys of periodontal disease. J. Dent. Res. 1956; 35: 350
- Russell A.L. Some epidemiological characteristics of periodontal disease in a series of urban populations. J. Periodont 1957; 28: 286
- Russell A.L. The geographical distrubution and epidemiology of periodontal disease. 1960, WHO/DH/34. Geneve
- Russell A.L., Ayers P. Periodontal disease and socioeconomic status in Birmingham, Alabama. Amer. J. Public Health 1960; 50: 206
- Russell A.L. International nutrition surveys: A summary of preliminary dental findings. J. Dent. Res. 1963; 42: 232
- Russell A.L., Leatherwood E.C., Consolazio C.F., Van Reen R. Periodontal disease and nutrition in South Vietnam. J. Dent. Res. 1965; 44: 775
- Schour J., Massler M. Gingival disease in post-war Italy (1945): I. Prevalence of gingivitis in various age groups. J. Amer Dent Ass. 1947; 35: 475
- Solomon H.A., Priore R.L., Bross I.D.J. Cigarette smoking and periodontal disease. J. Amer. Dent. Ass. 1968; 77: 1081
- Summer C.J., Oberman A. Association of oral disease with 12 selected variables: I. Periodontal disease. J. Dent. Res. 1968; 47: 457
- Waerhaug J. Epidemology of periodontal disease—review of literature. In World Workshop in Periodontics, S.P. Ramfjord, D.A. Kerr, M.M. Ash. The University of Michigan. 1966
- Waerhaug J. Prevalence of periodontal disease in Ceylon. Acta Odont Scand. 1967; 25: 205