Three-dimensional solid model has not been widely used in surgical prediction of orthognathic surgery because freque from occlusal restorations or prosthesis limited the usefulness of simulated surgery involving occlusion. We prepared three-dimensional(3D) solid model from CT data and integrated the 3D solid model with dental cast using a face-bow transfer technique combined with skeletal reference measurement and confirmation with cephalometric radiographs. With this simple and easy method, it was possible to predict bony interference between the proximal and distal segment of the mandible so that we can prevent condylar displacement after sagittal split ramus osteotomy of the mandible with prominent asymmetry. The method error was within 2mm and it seemed to be useful in preoperative planning for maxillofacial surgery with maxillo-mandibular occlusal change
Mandible* ; Orthognathic Surgery* ; Osteotomy, Sagittal Split Ramus ; Prostheses and Implants ; Surgery, Oral

No abstract available.
Animals ; Cisplatin* ; Ditiocarb* ; Epithelium* ; Mice* ; Tongue*

No abstract available.
Angiofibroma* ; Estrogens* ; Progesterone* ; Receptors, Progesterone*

Objective: The optimal treatment for inhomogeneous chronic subdural hematoma (CSH) remains unclear. This study thus aimed to compare single burr hole drainage with minicraniotomy in the treatment of inhomogeneous CSH, including complication and recurrence rates. Methods: The clinical and radiologic data of 240 patients with inhomogeneous CSH who underwent surgery between January 2005 and January 2021 were retrieved. A total of 111 patients were included in this study. Clinical and radiological outcomes were compared between the groups undergoing different surgery types. Results: A total of 102 (91.8%) patients showed clinical improvement after surgery; 81 (93.1%) and 21 (87.5%) patients showed improvements in clinical symptoms in the single burr hole and minicraniotomy groups, respectively. A total of 102 (91.9%) patients showed favorable radiological findings after the surgery, including inhomogeneous CSH disappearance in 64 (73.6%) burr hole and 13 (54.2%) minicraniotomy patients, and inhomogeneous CSH improvement in 17 (19.5%) burr hole and 8 (33.3%) minicraniotomy patients. There were no significant differences in the patient characteristics or surgical outcomes between the groups. Conclusion Single burr hole drainage showed a slightly better improvement in clinical and radiologic findings and lower recurrence and complication rates than minicraniotomy. There were no statistically significant differences between the two groups.

Although penetrating brain injury is rare, it is associated with high morbidity and mortality. In several studies, even if very few patients arrive at the hospital alive, half of them eventually die, and the other half have significant neurological sequelae. Cerebrospinal fluid (CSF) leakage caused by traumatic brain injury is common. Therefore, we should be aware of the complications, prognosis, and follow-up strategies of penetrating brain injuries. A 55-yearold man was brought to our hospital with diffuse cerebral contusion and skull fracture. Three weeks after successful surgery, the patient returned with a large amount of pneumocephalus and pneumoventricle caused by delayed CSF leakage. Fortunately, the patient was discharged without neurological deficits after reoperation. In the urgent situation of penetrating brain injury, the treatment and prognosis vary depending on the initial actions and clinical factors. In addition, we should be aware that a variety of complications, as well as CSF leakage, can occur in patients with penetrating brain injuries.

No abstract available.
Osteoporosis* ; Radionuclide Imaging*

No abstract available.
Humans*

No abstract available.
Humans*

N,N-Dimethylformamide (DMF) is globally used as an organic solvent in the production of synthetic leather and resins because of its low volatility, making it an attractive industrial material. Despite its excellent property as a chemical solvent, utilization of DMF is somewhat controversial nowadays due to its hazardous effects on exposed workers in work places. Many toxification cases are being reported globally and the number of cases of liver damage is still increasing in developing countries. On account of this, a series of epidemiologic surveys are being conducted to understand the degrees of liver damage caused by DMF exposure. Furthermore, many investigations have been performed to clarify the mechanism of DMF-induced liver toxicity using both human and experimental animal models. This review summarizes the current occupational cases reported on liver damage from workers exposed to DMF in industrial work places and the research results that account for DMF-induced liver failure and possible carcinogenesis. The findings reviewed here show the synergistic toxicity of DMF exposure with other toxicants, which might occur through complicated but distinct mechanisms, which may extend our knowledge for establishing risk assessments of DMF exposure in industrial work places.
Developing Countries ; Dimethylformamide ; Humans ; Liver ; Liver Failure ; Models, Animal ; Occupational Exposure ; Risk Assessment ; Toxicology ; Volatilization ; Workplace

The purpose of this study was to evaluate neurosensory disturbance associated with implant surgery performed by implant practitioner (n=47) composed of trained oral surgeon, periodontist, prosthodontist. The incidence, type and duration of sensory disorder were investigated. Anatomical factor of the patient and experience of operator were also evaluated. The result revealed high incidence of inferior alveolar nerve damage (45%) regardless of experience of implant practitioner. The sensory disturbance sustained within 6 months for 61% of cases, which revealed almost normal recovery of nerve function. Initial neurologic sign after nerve damage was not coincide with their consequence of recovery. Half of the practitioners tried surgical intervention to the implants such as removing the fixture, partial unscrewing or re-implant shorter fixture, of which trial regarded as effective measure for 53% of cases. The result indicates that the objective method of sensory nerve evaluation should be introduced to the implant practitioners and the importance of informed consent for possibility of nerve damage in mandibular implant fixation.
Dental Implants ; Humans ; Incidence ; Informed Consent ; Mandibular Nerve ; Neurologic Manifestations ; Prevalence* ; Retrospective Studies* ; Sensation Disorders