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顆頭運動の解析点について
Get PDFapplication/pdfThis article reviews problems in locating the analysis point of condylar movements and suggests the clinical application of the rotation center of the condylar movement during protrusion as a posterior reference point for the articulator. There are mainly three problems in measuring and expressing three-dimensional condylar movements. The first problem is that the condylar movement is hidden under the skin and thus not directly visible. Previously roentgenographic methods, called cinefluorography, were used to study condylar movement, but ethics committee no longer allow the use of X-ray imaging methods for such experimental purposes because of the radiation damage. The recent development of ultra high speed MR imaging method is expected to contribute to the non-invasive study on condylar movement. The second problem is that it is difficult to describe condylar movement because it is the movement of a three-dimensional object. This raises question of what descriptions are suitable for analyzing condylar movements. The third problem is that the path of the condylar point depends on the position of the monitored point because mandibular movements include rotation. To avoid this problem the monitored point of the condyle has to be situated at the rotation center of the condyle. The measuring equipment with six degrees of freedom enables us to accurately locate the position of the rotation center of the condyle using an exploration algorithm. However, it has been demonstratad that the rotation center is positioned in a certain domain. This shows that the movement of the condyle is not like that of an articulator and the position of the rotation center of the condyle cannot be definitively located. If the position of the rotation center must be converged on a limited area and the rotation center of the condyle must be easy to locate, another technique for locating the position of the posterior reference point should be introduced.journal articl
食道憩室に停滞した異物の1例
Get PDFapplication/pdfVarious accidents during dental treatment including aspiration or accidental ingestion of prostheses and fractures or aberrant position of dental devices. Inappropriate measures and management of such foreign bodies sometimes cause risks of serious complications. Here, we report a 68-year-old male with retained foreign body in the esophageal diverticula due to aspiration during dental treatment. This case allowed us to closely reexamine the need for patient reassurance during management as well as preventive measures at the onset of medical accidents during dental treatment.journal articl
Sex determination of the juvenile skull using cephalometric radiography in Japanese children
Get PDFapplication/pdfFacial reconstruction is a technique that allows human skeletal remains to be used to build a facial image of the target individual during life. This technique is based on databases of facial soft tissue thickness. However, application of this technique is facilitated by accurate information such as age, sex and ancestry. Little information is available from the skull alone for building face reconstructions, particularly for skulls from juveniles. This study estimated sex differences from the cranial bases of juvenile skulls and observed significant differences between male and female in the S-N plane for Japanese children at 6-to 18-years-old.journal articl
骨組織形成を伴う多形性腺腫の1症例
Get PDFapplication/pdfWe reported a case of pleomorphic adenoma with bone formation, occurring in the chin of a 34-year-old Japanese man. Histopathology showed the typical pleomorphic adenoma with bone formation. According to the immunohistchemical examination of S-100, we discussed on the origin of the bone forming cells.journal articl
下顎に発生したエナメル上皮腫の1症例 : Runx2の免疫組織化学的検討
Get PDFapplication/pdfA case of ameloblastoma in a 67-year-old male Malay patient was described with immunohistochemical examination of Runx2. After histopathological examination and diagnosis, the immunohistochemical expression of transcription factor Runx2 was examined. Histopathologically, the tumor consisted predominantly of proliferating follicular nests of odontogenic epithelial cells randomly disposed in the fibrous tissue. Some of these ameloblastoma cell nests showed features of central cystic degeneration, squamous metaplasia, and keratinizing pearl formation. Immunohistochemically, positive reactions of Runx2 was observed in some ameloblastoma cells, the peripheral layer cells and some inner cells of the nests. Furthermore, Runx2 positive products were observed in most of cells showing squamous metaplasia in ameloblastoma nests.journal articl
頬横動脈の一例
Get PDFapplication/pdfIn this study, we found an A. transversa buccalis in the cadaver of a 77-year-old Japanese male for anatomy practice at Matsumoto Dental University in 2005. The A. transversa buccalis originated from the external carotid artery at the level of the zygomatic arch. It ran to the anterior face and divided into the superior and inferior labial arteries. Very few reports on the A. transversa buccalis are found in the literature.journal articl
ガンマナイフによる組織変化と臨床応用
Get PDFapplication/pdfGamma knife surgery (GKS) has been increasingly utilized to manage a wide variety of indications including arteriovenous malformations, brain tumors, Parkinson disease, or focal epilepsy. In clinical, practice, GKS is thought to be a safe and effective treatment for these diseases, even if patients are old or at high risk; however, little is understood about the alteration of biological properties induced by gamma irradiation during procedures using this device. In recent studies using animals, it has been shown that low-dose gamma irradiation promotes survival of injured neurons in the central nervous system via homeostasis-driven proliferation of T cells, whereas a high dose causes marked degeneration of the capillary endothelial cells, consequently inducing edema and necrosis in the irradiated area. More recently, GKS has also been employed to treat intractable pain control, such as trigeminal neuralgia, thalamic pain and cancer pain. Some investigators have suggested that gamma irradiation may relieve completely these pains by increasing the levels of β-en-dorphin in both blood and cerebrospinal fluid. Thus, it is very important to conduct further basic experiments to determine the optimal treatment protocol using GKS for various diseases across many fields.journal articl
