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Journal of Dental Research
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Unification of the "Burst" and "Linear" Theories of Periodontal Disease Progression: A Multilevel Manifestation of the Same Phenomenon

M.S. Gilthorpe1,*, A.T. Zamzuri2, G.S. Griffiths3, I.H. Maddick4, K.A. Eaton3 and N.W. Johnson5

1 Biostatistics Unit, Academic Unit of Epidemiology and Health Services Research, Medical School, University of Leeds, 24 Hyde Terrace, Leeds, LS2 9LN, UK;
2 Dental Training School Malaysia, No 3 Sepoy Lines Road, 10450 Penang, Malaysia;
3 Department of Periodontology &
4 Department of Paediatric Dentistry, Eastman Dental Institute, University College London, 256 Gray’s Inn Road, London, UK; and
5 Department of Oral and Maxillofacial Medicine and Pathology, Guy’s King’s and St Thomas’ Schools of Medicine, Dentistry and Biomedical Sciences, Caldecot Rd, London, UK;


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  		Figure. A summary of all the possible changes in either periodontal outcome across the study period. The nine charts represent all possible transitions across three time points, where the black dots represent hypothetical outcome values at each measurement occasion. Outcomes may remain constant (chart 1) or, after no initial change, may exhibit change from occasions two to three (charts 2, 3) or, after initial progression, there may be no change (chart 4), further progression (chart 5), or improvement (chart 6), and, similarly, following initial improvement (charts 7 to 9).

 

Journal of Dental Research, Vol. 82, No. 3, 200-205 (2003)
DOI: 10.1177/154405910308200310
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