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弱智学生218名,龋齿患病率为72.9％;对照组学生1363名,龋齿患病率为28.5％,两组间差异非常显著(u=8.1,P<0.01),说明弱智学生易患龋齿。弱智学生的龋齿81.5％发生在第一恒磨牙,8.9％发生于第二恒磨牙,其他牙齿患龋少,龋齿的程度主要是0—2度。弱智学生牙齿开始萌出年龄较正常学生约晚1～3年,其生长发育也低于正常学生。
There were 218 mentally retarded students with a prevalence of dental caries of 72.9%. There were 1363 students in the control group with a prevalence of dental caries of 28.5%. There was a significant difference between the two groups (u = 8.1, P <0.01), indicating that mentally handicapped students were predisposed to dental caries. 81.5% of mentally retarded students' dental caries occurred on the first permanent molars, 8.9% occurred on the second permanent molars, the other teeth suffered from less caries, the degree of dental caries was mainly 0-2 degrees. Mentally handicapped students began to erupt their teeth about 1 to 3 years later than normal students, and their growth and development were also lower than those of normal students.