Joint Dental Survey in Nigeria (Follow-up Research)

久保田组织了一个由7名牙医和尼日利亚同事Hollist教授、Olusile博士组成的调查小组。ajyhai - ohe博士和名誉教授Grillo对尼日利亚人民生活及其周围地区的牙病进行流行病学调查。该调查从1980年开始每5年在同一地区的同一所学校进行一次，1981年是第一次，1986年是第二次，1991年是第3次。通过这些纵向调查得到的结果如下：尼日利亚人的口腔卫生状况较低，但龋齿发生率较低，无错牙合，恒牙列由32颗牙齿组成，磨耗严重。本研究的目的是证明咀嚼是如何通过他们的传统食物生活影响咀嚼系统的出生后生长的。对象与方法本研究的时间为1991年10月28日至11月22日。对3、5、6、8、10、12岁的儿童、14 ~ 70岁的儿童和成人进行了为期5年的随访，共检查了1560名儿童（780名农村儿童，780名城市儿童）和300名农村成人。检查龋齿、牙周病、颌面石膏印模、咬合力、磨耗、颌关节x线片、口腔x线片。对19岁以下的孩子进行x光检查时得到了他们父母的许可。通过访谈对130个家庭的饮食生活、断奶期和家庭成员进行了调查。结果1)与10年前和5年前相比，有龋病经验者的比例没有增加；2)采用藻酸盐印模材料制作556只口腔静压模型278只。按牙龄分为lla期（89例）、lla期（44例）、lVa期（57例）、Va期（88例）4类，分别测量牙槽间宽度、牙弓长度等。3)对130个尼日利亚家庭的饮食习惯、断奶期和家庭组成进行分析。4)根据全牙列的强烈磨损，检查下颌关节的x线图像作为关节头的重塑。5)通过对咬合力的对比分析x线体位图。6)分析CPITN对牙周病的治疗需求等级及牙菌斑、牙结石、牙龈炎的影响。牙龈炎、牙菌斑和牙石的发生率较高，但不向牙周炎转移。恒牙弓x线片（100）显示，牙槽骨吸收随年龄增长有增加的趋势，但牙周炎却相当压抑。少

Kubota organized a surveying team with seven dentists and Nigerian co-workers, Prof. Hollist, Dr. Olusile, . Dr. Ajyai-Ohe and Emeritus Prof. Grillo to perform the epidemiological survey of dental diseases of Nigerian people in lie-ife and its environs. This survey has been doing at the same schools in the same place longitudinally every five-year, first in 1981, second in 1986 and third in 1991 since 1980. The results obtained through these lorigitudinal surveys were as follows ; the oral hygenic situation of Nigerian people is quite low, but is low in the caries experience and they have no malocclusion and the permanent dentition is composed of 32 teeth which showed intensive attrition. The purpose of the present investigation is to certify that how a chew affects the postnatal growth of the masticatory system through their traditional food life.Subjects and MethodsThe present longitudinal research was performed during the period from October 28 to November 22, in 1991. Each 60 child … More ren of 3, 5, 6, 8, 10, 12 years age, the five-year follow-up children and adults from 14 to 70 years old were examined totally 1560 (780 in rural, 780 in urban) in children and 300 rural adults. the dental caries, periodontal diseases, plaster impression of the jaws to make plaster model, biting force, attrition, X-ray image of jaw joint, dental X-ray were examined. Permission of their parent was given for X-ray examination of children below the 19 years old. The food life, weaning period and member of a family were questioned by an interview in 130 families.RESULTS OBTAINED1) The percentage of caries experienced person did not increase in comparison with that of ten or five years ago. 2) 556 gnathostatic medels of 278 subjects were made using Alginate impression material. The models were classified by a dental age into 4 categories, lla stage (89), llla stage (44), lVa stage (57) and Va stage(88), in which the measurement of breadth between canies, length of dental arch etc. are to measure. 3) Nigerian food habit, weaning period and family composition are analyzed in the 130 families. 4) X-ray image of the jaw joint is examined as a remodeling of the joint head according to the intensive attrition of the full dentition. 5) The roentogenographic cephalogram is analyzed in comparison of the biting force. 6) The treatment need grade of periodontal diseases by CPITN and dental plaque, dental calculus and gingivitis are analyzed. The gingivitis, plaque and calculus were seen in a high frequency and it does not move to the periodontitis. The dental X-ray films of the permanent dental arch (100) showed that the alveolar bone absorption showed an tendency of increase with age, but the periodontitis was quite repressive. Less