Takatoki Ono

Recapturing the persistent anteriorly displaced disk by mandibular manipulation after pumping and hydraulic pressure to the upper joint cavity of the temporomandibular joint.

AbstractMandibular manipulation assisted by pumping and hydraulic pressure in the upper joint cavity were successful in treating patients with persistent closed lock after nonsurgical treatment failed to be beneficial. This paper reports the clinical procedure and short-term results.

Temporomandibular joint arthroscopy by inferolateral approach

A clinically successful technique for temporomandibular joint (TMJ) arthroscopy by the inferolateral approach is reported. The outline of the superior and inferior articular cavities of the TMJ except for the lower anterior pouch could be visualised; arthroscopy could be performed on most patients under local anesthesia in the out-patient operating room. Clinical usefulness and security of the TMJ arthroscopy based upon anatomical understanding is described.

Diagnostic Arthroscopy of the TMJ: Differential Diagnoses in Patients with Limited Jaw Opening

AbstractArthroscopy of the temporomandibular joints was performed in patients with limited jaw movement, locking, and trismus. Three different groups of intra-articular pathological characteristics were observed. Traumatic arthritis showed features of synovitis and/or abnormal vascular network on the joint surface. Significant fibrous changes in the artcular disk, with occasional adhesive changes among the intermediate articular spaces, suggested fibrosis of the articular capsule. The last group was suspected of having anterior disk displacement; excessive stretching and occasional rupture on a part of the synovial membrane in the upper posterior pouch were frequently observed. This study indicates a higher differentiation of diagnostic value of arthroscopy for certain TM disorders.

Osteoma in mandibular condyle

A case of peripheral osteoma occurring in the mandibular ramus in a 26-year-old man is reported. Radiographic examination revealed a pedunculated, protruding globular, bone-like opaque mass around the notch of the right mandibular ramus. Histopathological examination showed a lamellar bone structure with irregular arrangement. Wide trabeculae, narrow interstitial areas, and many fibrovascular channels were detected by scanning electron microscopy. Thus, characteristic findings of a compact osteoma were obtained clinically and histopathologically.

Evaluation of gray-scale ultrasonography in the investigation of oral and neck mass lesions

The clinical applicability of gray-scale ultrasonography to oral and neck mass lesions was investigated. Ultrasonographic findings of pattern, boundary echo, internal echo, and posterior wall echo were correlated with pathologic findings in 22 surgically treated cases. Using this method, the solid or cystic nature, the size, the shape, and the location of the lesions could be determined preoperatively. Because it lacks radiation hazard, ultrasonography appears to be the diagnostic method of choice for patients with enlarged oral and neck tumors.

Tuberculous submandibular lymphadenitis

Abstract Two cases of tuberculous submandibular lymphadenitis were reported. Painless, gradually enlarging masses that did not respond to antibiotic therapy were noticed. Histologic examination of surgically extirpated specimens disclosed tuberculous lymphadenitis in both cases.

A new material (single crystal sapphire screw) for internal fixation of the mandibular ramus

A new single crystal sapphire bone screw which has favourable properties such as chemical stability, mechanical strength and biocompatibility, was applied for rigid internal fixation of the sagittal split osteotomies in 86 cases since 1982. Radiographic findings supported the excellent biocompatibility of the material; there was no noticeable bone loss around the screw and the excellent bone adaptation to the threaded portion was observed. The screws can mechanically support the split mandibular rami until bone union occurs. Complications due to the screw were not encountered in follow-up periods of 0.5-3.5 years.