Studies on etiological epidemiology and preventive procedure for root surface caries.

这些研究是1993年至1995年进行的牙根表面龋病的病因流行病学研究。在此期间，我们的研究项目显示并发展了以下结果。根面龋的原始诊断标准。通过流行病学调查发现，成年男性的根面龋发病率高于成年女性。其患病率在50-59岁的受试者中达到高峰。这种患病率与职业之间也存在明显差异。1994年至1995年还进行了根表面龋病的微生物学研究。1980年以前，大多数研究者报道根表面病变的优势微生物是放线菌。然而，1980年后，变形链球菌被集中作为根损的龋诱导菌。我们的研究结果还表明，变形链球菌和乳酸菌对牙根龋有积极的作用。牙根面龋的病因主要有：不良的氟化物应用、日常生活方式、年龄、牙龈萎缩、口腔卫生行为性别等。此外，咬合状态可能与这种类型的龋齿有关。这些结果表明根面龋与冠状龋具有不同的特征。我们正在计划适当的预防措施。

These studies have been carried out from 1993 to 1995 for etiological epidemiology of root surface caries. During this period, our research project showed and developed the following results.1. Original diagnostic criteria of root surface caries.2. Due to the epidemiological survey of prevalence, adult men had more root surface caries than adult women. The peak of its prevalence was observed among 50-59 year-old-subjects. And this prevalence was also clearly different with their occupation.3. Microbiological studies for root surface caries were also done from 1994 to 95. Before 1980, most of researchers reported that the predominant microorganisms of root surface lesion were Actinomyces species. However, mutans streptococci was focused as caries inducible bacteria of root lesions after 1980. Our results also presented the active role of mutans streptococci and Lactobacilli on root caries.4. Concerning the etiological factors of root surface caries, poor fluoride application and daily life style were mentioned as well as aging, gingival recession, oral hearth behavior gender. Moreover, occlusal status might be related with this type of caries.These results indicated that root surface caries has different character from coronal caries. We are planning the suitable preventive procedure of this lesions.