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Mandibular movements are produced by a combination of condylar translation and rotation. The relationship between condylar translation and rotation during opening jaw movement and border movement was studied in 10 controls (4 men and 6 women), aged 20 to 26, without signs or symptoms of masticatory disorders and 61 patients (5 men and 56 women), aged 19 to 64 (average age 37.5), with closed lock of the temporomandibular joint (TMJ). The patterns of condylar movement and clinical findings were evaluated by means of multivariate analysis. Mandibular movements were recorded with an electronic jaw tracking system (JKN-1) consisting of 5000-pixel linear charge-coupled-device (CCD) cameras that register the position of six light-emitting diodes (LEDs) muted on two facebows separately attached to the upper and lower jaws. A computer produced plots of the opening angle versus the anterior condylar translation as well as the condylar path in the sagittal plane.The condylar translation/rotation patterns were analyzed visually for differences in trace patterns. The patterns on visual analysis could by classified into six types. Type I: At the begining and at the end of opening, rotation was more pronounced than translation. Type II: At the end of opening, translation was more pronounced than rotation. Type III: At the begining of opening, rotation was more pronouced than translation. Type IV: The condylar translation/rotation patterns were almost linear. Type V: At the end of opening, rotation was pronounced and translation was severely limited. Type VI: At opening, rotation was pronounced and translation was completely limited. These patterns in the patients with closed lock of the TMJ differed from those in the controls. Of the controls, 50% were found to be type I, and 30% were type II. In contrast, 44% of the patients with closed lock were found to be Type V, and 33% were Type VI.As for opening movement of patients with closed lock of the TMJ, abnomalities of condylar movement were more pronounced than those of movements at the incisive point. The results indicate that it is possible to diagnose the condition of closed lock disease. Moreover, our statistical evidence shows that it is possible to predict the patterns of condylar movement depending on age, degree of pain at opening, and deformity of the condyle.

Eosinophilic granuloma of soft tissue mainly appeares as a tumor-like nodule in the subcutanous head and neck region. Histopathologically, it is characterized oy the presence of lymphoid follicles, and marked infiltration of eosinophils, as well as fibrosis and vascular proliferation.We reported 4 cases of cosinophilic granuloma of soft tissue in the parotid-massetcr region, inferior surface of the tongue and buccal region. We obtained successful results by surgical procedures and/or radio therapy.

1. We experienced a basal cell nevus syndrome with huge multiple jaw cyst as major symptom and reported the case with other 4 experienced cases in our department.2. Ocular hyperterorism, broadened nasal root, frontal and biparietal bossing, jaw cyst, bridging of sella turcica and family appearance were observed at all cases.3. Basal cell nevi and pits were observed in cases 1, 2 and 5, but were unknown in cases 3 and 4.4. Keratocyst was the histological diagnosis of all jaw cysts.5. Treatment methods with jaw cysts were: Encleation after murspalization in case 1, presently murspalization and in the future enucleation in case 2, encleation alone in cases 3 and 4, and murspalization alone in case 5. Yet, cases 2 and 5 were recurrence by murspalization alone, therefor it was thought necessary to do complete enucleation including the surrounding healthy bone tissues.6. As jaw cysts were keratocyst, they were apt to recur, and the importance of long term progress observation is important.

In order to reconstruct the perfect shape of jaw bones, we developed the new operation procedures by using reimplantation of resected jaw portion treated by freezing and warming. The operation procedures which we developed are as follows.One is the one-stage procedure in which immediate reconstruction is performed intraorally, indicated for benign tumors and tumorlike conditions. The other is the two-stage procedure in which late reconstruction is performed extraorally, indicated for malignant tumors.We resect the affected jaw bone with the intact part included, and remove the affected parts from the resected jaw portion under direct observation, then decorticate the inner layer of the cortical bone and drill small holes on the cortical bone to prevent the cracking by deep freezing and to ensure the revascularization from the surrounding soft tissue.In order to kill the tumor cells within the resected jaw bones totally, we use two different freezing and warming treatments. The resected jaw portion is put into the freezing chamber at-85 degrees C for 45 minutes, and then immersed into physiological saline solution at+ 45 degrees C for 15 minutes. When the freezing apparatus is not available, the resected jaw portion is immersed into liquid nitrogen at-195 degrees C for 5 minutes, and then immersed into phisological saline solution at 45 degrees C for 10 minutes. These treatments are repeated three times respectively. After the treatment the cells in the lesion decreased in number and became low staining drastically.In the malignant cases the resected jaw portion is treated by the freezing and warming mentioned above, then lyophilized and stored in a vacuous bottle at the room temperature for over 18 months.The combination of resected jaw portion and fresh autogenous marrow and cancellousbone are used for reconstruction. The former is expected to play a role as an anatomical template, and the latter is used as a material capable of inducting osteogenesis.The one-stage procedure was performed in 6 cases and two-stage procedure in 2 cases. The mandibular reconstruction was performed in 7 eases and maxillary reconstruction in 1 case. No tumor recurrence was observed and satisfactory results without complication were obtained. At the postoperative biopsy of time reimplanted area, a large number of bone cells were observed in the bone that presented layers and remodelling, implying the absorption and new bone formation in the reimplanted bone.