2口腔流行病学龋病流行病学-武大《预防口腔医学》课件.pptVIP

The Epidemiology of Dental Caries Types of study Descriptive studies: cross-sectional, longitudinal, historical Analytical studies: case-control, cohort Experimental study: Clinical trials, Intervention, fields trials An Index is a graduated, numerical scale with upper and lower limits, with scores in the scale corresponding to specific criteria 指数:表明某种现象变动的程度。指标作用或 批示作用的标识。 用数值级差作标准，测量和比较疾病的扩展范围和严重程度。 An Ideal Index 简单 Simplicity 价廉 Acceptability 有效 Validity 可靠 Reliability 敏感 Sensitivity 统计学方法处理 Quantifiability 可逆性指数: reversible 菌斑指数 gingivitis 累积性指数: cumulative DMF, dental caries Scale for measurement Nominal scale：Orthodontic angles classification Marital status: single, married, divorced, windowed Colour of hair: red, yellow, black, green Types of Blood: O, A, B , AB Ordinal scale： plaque index; Gingival Index, CPI Years of education: 0, 1-5, 6-9, 10 Severity of disease: mild, moderate, severity Interval： temperature in Celsius temperature 22 and 26, 32 and 36 Ratio： weight, mortality rate, DMFT Examine equipment Artificial light Dental mirror CPI probe Oral Health Surveys 4th Edition Code Conditions Primary teeth Permanent teeth Crown Crown Root A 0 0 Sound B 1 1 Decayed C 2 2 Filled, with decay D 3 3 Filled, no decay E 4 - Missing 一、龋病常用指数 恒牙龋失补指数 DMF指数是指龋、失、补牙数或牙面数之和 乳牙龋失补指数 dmft，dmfs指乳牙的龋、失、补牙数或牙面数之和 龋均和龋面均 Mean DMFT：指受检查人群中每人口腔中平均龋、失、补牙数 龋、失、补牙之和 龋均＝ 受检人数 患龋率（caries prevalence rate） 患龋病