Clinically, there are many diseases that provoke disturbance of mouth opening. Among them, disturbance of mouth opening by fibrous dysplasia of the mandibular condyle is very rare. We report a case of fibrous dysplasia with chief complaint of disturbance of mouth opening who experienced complication of the osteitis of the mandible during the course. The patient was a 30-year-old man, who was referred to our hospital. Panoramic radiography findings suggested fibrous dysplasia. We carried out further examination by CT and biopsy of the mandible, and diagnosed it as fibrous dysplasia. During the course, the patient sometimes complained of pain and swelling of the mandible, so we considered a complication of the osteitis of the mandible, and took a blood sample, and CT and MR images. The results for the blood sample were almost within normal limits, but CT and MR images partially revealed inflammation of the mandible. We prescribed antibiotics, and the pain and swelling of the mandible decreased. From the above, complication of the osteitis and fibrous dysplasia were suggested. As acute pain and swelling in fibrous dysplasia is considered to be a sign of malignant conversion, we should follow the patient with close observation.

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We investigated the association between the direction of disc displacement and intermittent lock in the temporomandibular joints.
The subjects were 26 patients (26 joints) with intermittent lock, who underwent magnetic resonance imaging (MRI). As the control group, we randomly selected 26 patients (26 joints) without intermittent lock. The group with intermittent lock consisted of 20 females and 6 males, with a median age of 18 years (range: 14 to 80 years). The group without intermittent lock consisted of 22 females and 4 males, with a median age of 22 years (range: 14 to 71 years).
Imaging of sagittal and coronary sections was performed using a 1.5 Tesla superconducting MRI device, and the direction of disc displacement was investigated.
In the group with intermittent lock, the incidence of lateral displacement of the disc was significantly higher than that in the group without intermittent lock.

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Purpose: Temporomandibular disorder (TMD) is frequently related to disk displacement and condylar deformity. Generally, maintenance of disk translation does not accompany trismus. However, few studies have been reported on the relationship between disk translation and patients with advanced-stage TMD. Therefore, the present study assessed the influence of disk and condylar mobility on TMD severity.
Method: One-hundred and ninety-three TMD patients who received MRI from 1992 to 2000 in Kanazawa University were enrolled. They were assessed and classified into 12 groups in accordance with MRI findings. Measurement of maximum mouth open range (MMO) was corresponded to the time of taking MRI, and then the values of each group were observed.
Results: MMO values in the mild-OA+anterior disk displacement with reduction group were significantly higher than those in the mild-OA+anterior disk displacement with fibrous adhesion group (p<0.05).
Conclusion: Severity of TMD was significantly correlated with disk translation in mild-OA cases.

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The author divided 40 patients into a palatal splint group and a stabilization splint group at random to clarify the effect of splint therapy an masticatory muscle disorders, and examined the rate of improvement and validity of the splint therapy.
The rate of improvement of the palatal splint therapy group was 40%, and the rate of improvement of the stabilization splint therapy group was 75%. The value of Fisher's exact probability test turned out to be 0.027 and the direction of stabilization splint therapy was improved more than that of palatal splint therapy. Therefore, it is suggested that splint therapy with stabilization type is an effective method.

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