ความสัมพันธ์ระหว่างปัจจัยและจำนวนการขึ้นเฉลี่ย ของฟันกรามแท้ซี่ที่หนึ่งของนักเรียนชั้นประถมศึกษาปีที่หนึ่ง ในเขตอำเภอเมือง จังหวัดอุตรดิตถ์

Abstract

This descriptive study was conducted to achieve two main purposes. The first was to identify a relationship between the factors affecting eruption of the permanent first molars and the average number of permanent first molar erupted in students studying in grade 1 in Mueang District, Uttaradit Province. The second purpose was to investigate the number of permanent first molar erupted in oral cavity of the study samples. The study was performed in a group of 368 students sampled by stratified random selection. Data was collected during August to October 2014. Data analysis was implemented using descriptive statistics, Mann Whitney U Test and Logistic Regression. The result showed that the grade 1 students with sealable permanent first molar had an average of 2.5±1.4 teeth per person. Around 38% of the children had 4 sealable permanent first molars, 16.3% had 3 sealable permanent first molars, 20.1% had 2 sealable permanent first molars, 7.6% had 1 sealable permanent first molar, and 17.1% had no sealable permanent first molar. A significant correlation (p-value<0.05) was found between social status, weight to height nutritional status and number of students who had at least 1 sealable permanent first molars. With other factors controlled, the probability of low socioeconomic status students having at least 1 sealable permanent first molars was 0.48 times less than those with the higher one (OR=0.482; 95%CI=0.279-0.843). Additionally, by controlling other factors, students who were considered as poor nutritional status by weight to height criteria were likely to have 0.4 times less in having at least one sealable permanent first molar than those with normal or high nutritional values (OR=0.40; 95% CI=0.21-0.77). The information obtained from this research underlined that the majority of study samples do not have 4 sealable permanent first molars. The study also indicates that social status and nutritional status influences the number of sealable permanent first molar in the study samples. The conclusions can be used further intervention in Public Health Dentistry.