In this epidemiological study, 2121 school children(l050 boys and 1071 girls) that aged 9-16 years were surveyed. The subjects were randomly selected in cities of Jeonbuk, Korea and a questionnaire consists of 30 items including symptoms of craniomandibular disorders (CMD) and contributing factors of CMD were given to them. The author explained the definition of each item to subjects and they checked the answer of each item for themselves. The data were processed with regard to the prevalence of items and difference by Age or Sex with SPSS/PC+ package.
The obtained results were as follows :
1. Among symptoms of CMD, joint pain by hard food chewing showed the highest rate of occurrence (40.8%), and locking sensation during mouth opening showed the lowest rate(5.4%).
Symptoms with consistently increased rate of occurrence with age were joint sound, joint pain by hard food chewing, discomfort and/or spasm of jaw muscle.
2. With regard to prevalence of bad oral habit, about 12% of subjects had bruxism or clenching, respectively, but 35.1% had biting of pencil, ball point pen, 61.0% had lip biting or nail biting.
3. There were some items which always occurred more in one of boys and girls without regard to increase of age. In boys those were clenching first under stress, family and/or friend look like disregarding me, experience of shock or heavy force to jaw, and in girls nail biting, lip biting or chin in hand, getting cross without reason.
4. There was 64.2 % of total subject that have one or more symptoms of craniomandibular disorders.
|