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community dentistry epidemiologist statistics plaque index calculus index periodontal disease index community periodontal index of treatment needs scoring criteria gingival crevice data sampling central tendency dispersion presentation of data occupational hazards in dentistry radiation hazard gingival index triad of keyes etiology of dental caries dental caries pathogenesis periodontal diseases pathogenesis periodontium periodontal disease eoidemiology properties of an ideal index caries classification scale dmf index dental caries assessment indices epidemiology dental students dentist dental practitioners clinical dentistry researchers dentidt dental health care practitioners dental public health oral health practitioners illumination and retraction visibility accessibility instrument activation finger rest finger grasp teckniques principles periodontal instrumentation classification of periodontal instruments periodontal instruments fidelity beneficence non-maleficence patient autonomy ethics felt need expressed need normative need community demands types of need prevention of occupational hazards in dentistry musculoskeletal hszard