Abstract
To conduct research on the actual condition of the internal derangement in children is quite important for finding methods for prevention and treatment. Internal derangement is highly involved in young children with signs and symptoms of temporomandibular disorders(TMD). It has also been reported that anterior disc displacement is revealed in adults without the signs and symptoms of TMD. Few reports using MR imaging concerning aspects of anterior disc displacement in children without and with the signs and symptoms of TMD have been found.
I studied and compared MR images among children with and without signs and symptoms of TMD. The following results were obtained.
1. In children without signs and symptoms of TMD, anterior disc displacement was found in 16.7%(5/30), of which 20%(1/5) was without reduction.
2. In children with signs and symptoms of TMD, anterior disc displacement was found in 80.3%(53/66), of which 73.6%(39/53) was without reduction.
3. The degrees of disc displacement of 80.0%(4/5) and 20.0%(1/5) among children without TMD signs and symptoms was slight and moderate, respectively, while those of 62.3%(33/53) and 3.8%(2/53) among children with signs and symptoms of TMD, were moderate and severe, respectively.
4. A temporomandibular joint deformed disk was found in 10.0%(3/30) of children without signs and symptoms of TMD and was found in 59.1%(39/66) of children with signs and symptoms of TMD.
5. No joint effusion was found in children without signs and symptoms of TMD, while on the other hand effusion was found in 45.5%(30/66) of children with signs and symptoms of TMD.
In children with signs and symptoms of TMD, the findings of internal derangement did not show a light condition. On the other hand anterior disc displacement was obaerved in 16.7% of the children, disc deformed was 10.0% in spite of chiidren not having signs and symptoms of TMD. From above the facts, it was shown that pedodontists should be a concern and we should be solicitous concerning temporomandibular joints in children.
