The relationship between dental diseases in deciduous and permanent dentition of the same indivisuals

这项研究的材料是基于从一岁半到三岁半的相同个体中的纵向牙齿状况。在这些受试者中，54名儿童在12岁时接受了复查，40名儿童在13岁时连续复查，32名儿童在14岁时复查。每次检查时，根据DEF和DMF指数、PMA指数、前牙牙合的诊断标准和Cariostat的龋活度试验检查牙病和龋病活动性。分析乳牙期与恒牙期患龋率、患龋率及患龋率之间的关系。对于龋病，计算出乳牙期和恒牙期各指标之间的相关系数。3岁时的龋病活跃度与12岁、13岁和14岁的DMFT之间存在显著的统计学相关性。在3岁时，DIFT与12岁、13岁和14岁的DMFT之间存在显著的相关性。3岁时的DIFT与12岁至14岁期间的龋齿增长之间没有显著的相关性。1岁半至3岁半期间的龋齿增量与12岁、13岁、14岁的DMFT显著相关。正常组和错(牙合)组分别有1/3的患者在恒牙期转为其他咬合状态。乳牙期的上颌前突和深覆牙合与恒牙的咬合情况有相同的趋势。受试者在3岁时牙周炎的患病率非常低，而在12岁、13岁和14岁时牙周炎的患病率却非常高。

The materials for this study are based on longitudinal of dental conditions in the same indivisuals which carried out from the age of one and a half to three and a half. Of these subjects, 54 children were reexamined at the age of twelve, continuously 40 at the age of thirteen and 32 at the age of fourteen for the present study. They were examined on dental diseases and caries activity at each investigation, according to def and DMF index, PMA index, diagnostic criteria for the assessment of occlusion in the anterior segment and caries activity test by Cariostat. The relationship between the prevalence of dental diseases, caries incremnet and caries activity in the deciduous dentition and those in the permanent dentition were analyzed. With respect to dental caries, coefficients of correlation between each indices of the deciduous dentition and permanent dentition were computed.Result1. Statistically significant correlations were obtained between the caries activity at the age of three and DMFT at the age of twelve, thirteen and fourteen.2. Significant correlations were obtained between deft at the age of three and DMFT at the age of twelve, thirteen and fourteen3. Significant correlations were not obtained between deft at the age of three and caries increment during the period from the age of twelve to fourteen.4. Significant correlations were obtained between caries increment during the period from the age of one and a half to three and a half and DMFT at the age of twelve, thirteen and fourteen.5. One third of both normal occlusion and malocclusion groups changed to the other occulusal conditions respectively in the permanent dentition.6. The maxillary protrusion and deep overbite in deciduous dentition had a tendency to have the same occlusal conditions in the permanent dentition.7. The prevalence of gingivitis in the subjects at the age of three was very low while they were remarkably high at the age of twelve, thirteen and fourteen.