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

本研究旨在通过对成人和老年人的流行病学调查，分析根面龋和楔状缺损的病因。根据这些结果，我们将尝试规划合适的预防准则，对根面龋和楔状缺损.根面龋和楔状缺损的流行病学分析表明，患龋和缺损的年龄基本相同。但发病部位不同。结果表明，各疾病的特异性因素不随年龄增长而变化.根面龋微生物学研究表明，变链菌和乳酸杆菌的水平与龋损密切相关。楔状缺损区与微生物的关系不明显。还通过电泳光散射（ELS-800，Otsuka Electronics）测定细菌细胞的ζ电位。这些数据表明致龋性变形链球菌具有显著的吸附作用.咬合与根面病变如龋病、楔状缺损等部分相关。然而，没有证据表明根面损伤是由咬合力引起的。根面病变的预防应注意应用氟化物和防腐剂，促进唾液分泌，改善口腔卫生行为。

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.