STUDIES ON FACTOR ANALYSIS AND PREVENTION OF ROOT SURFACE CARIES AND DEFECT

本研究的目的是在成人和老年人流行病学调查的基础上，分析根面龋病和楔状缺损的病因。根据这些结果，我们将尝试制定适用于根面龋病和楔状缺损症的预防指南。对根面龋病和楔状缺损的流行病学分析表明，二者的发病年龄基本一致。然而，这些疾病的发病部位不同。结果：1.不同年龄组各疾病的发病因素各有不同。根面龋病的微生物学研究表明，变形杆菌、链球菌和乳杆菌的水平与龋损有很好的相关性。相反，楔状缺损处没有发现微生物之间的联系。细菌细胞的Zeta电位也用ELS-800，Otsuka Electronics电泳法测定。这些数据表明，致龋性变形链球菌具有显著的吸附作用。牙合与牙根表面病变，如龋齿、楔状缺损区等有一定关系。然而，没有任何证据表明牙根表面损伤是由咬合力引起的。对于根面病变的预防指南，应使用氟化物和防腐剂，促进唾液分泌，改善口腔健康行为。

The aim of this study was to analyse the etiological factors of root surface caries and wedge shaped defect based on the epidemiological surveys for adults and elderly. Due to these results we will try to plan the suitable preventive guidelines on root surface caries and wedge shaped defect.1. The epidemiological analysis of root surface caries and wedge shaped defect showed that age of occurrence for both caries and defect was almost same. However, site of these diseases was different. There results indicated the specific factors of each diseases without aging.2. The microbiological study of root surface caries reavealed that the level of mutans streptococci and Lactobacilli was well related to caries lesions. On the contrary, relation of microorganisms was not find in wedge shaped defect. The zeta potential of the bacterial cells was also determined by Electrophoretic Light Scattering (ELS-800, Otsuka Electronics). These data indicated that cariogenic mutans streptococci had a significant factor for adsorption.3. Occlusion and root surface lesions, such as caries and wedge shaped defect, was partially related. However, it did not follow from any evidence that root surface lesion was caused by occlusal forces.4. For the preventive guideline of root surface lesions, applications of fluoride and anti-septic agents, accelerate of salivary secretion and improvement of oral health behavior were expected.