The principal subjects discussed in this paper are the effects of cold rolling reduction on secondary recrystallization and magnetic properties of Fe-3%Si alloy. One-stage cold rolling process, which ...is known as a production method of high permeability grain-oriented silicon steel containing AlN precipitates, induced very unstable secondary recrystallization with too high cold reduction above 87%. Sharp deterioration of magnetic properties because of high reduction is related to the presence of fine grains, which mean poorly oriented grains deviating widely from the {110} grains. This incomplete secondary recrystallization is supposed to be caused by the steps as follows: The higher cold rolling reduction causes the weaker {110} orientation in primary recrystallized texture, and the secondary recrystallization temperature increases. The surface grains coarsen prior to secondary recrystallization. The larger surface grains, which are poorly oriented, consume the subsurface grains of the {110} nuclei. Therefore the more fine grains were observed in the finally annealed structure with the higher reduction. The two-stage cold rolling process was studied to clarify the effects of the first and second cold rolling reduction on secondary recrystallization. The second cold rolling affected magnetic properties rather than the first cold rolling in the two-stage cold rolling process.
Cleidocranial dysplasia is an autosomal dominant disorder characterized by skeletal anomalies such as patent fontanels, late erupting secondary dentition, short stature, and rudimentary clavicles.The ...locus for this disease was mapped to chromosome 6p21. Mutations in the RUNX2 gene has been shown to cause cleidocranial dysplasia. RUNX2 is a member of the runt family of transcription factors and its expression is found in developing osteoblasts and chondrocytes. An 8-year-old Japanese male with the clinical diagnosis of cleidocranial dysplasia was the subject of this study. His clinical description included delayed closure of sutures, late erupting secondary dentition, and hypoplastic clavicles.We did not discover any past history of cleidocranial dysplasia in his family. We performed mutational analysis for RUNX2 to determine if there was a m utation in RUNX2 in this patient. A missense mutation was detected in the coding region of the RUNX2. Arginine 225 (R 225) which was located at the C-terminal end of the runt domain was mutated and a replacement by tryptophan (R225W) was identified in the patient. This mutation, which results in premature termination in the runt domain, may produce a cleidocranial dysplasia phenotype by abolishing transactivation of the mutant protein. We studied the clinical evaluations of phenotypes of previous cases with R225W mutation in RUNX2. We could not, however, find any significant correlation of genotype and phenotype.
In pediatric dental clinics, soldering is generally used, but this is not a convenient method as it cannot be used in the oral cavity. Focus is now on recent laser development. The purpose of this ...study was to evaluate whether laser welding using an Nd-YAG laser could be used for appliances with an auxiliary spring. It was suggested that the tensile bond strength for laser welding irradiated with a 900 mJ Nd-YAG laser beam and with an irradiation angle of between 45°Cand 60°C was the beat combination compared to other combinations of the 600 mJ and 1200 mJ beams, with angles of 30°C and 90°C. It was further suggested that the tensile bond strength causes the laser beam to overlap continuously so that the irradiation is effective. The tensile bond strength for laser welding using the Nd-YAG laser was significantly lower than that of argentums soldering using a flame. We feel, however, that the tensile strength of laser welding is sufficient for clinical purposes. In addition, we feel that laser irradiation based on the Nd-YAG laser is useful in clinic because laser welding can be employed for procedures in the oral cavity.
The authors encountered a 9 year 3 month old girl with fibrous dysplasia who had undergone checked up the concerning oral health since she was 3 years 5 months old at the Pediatric Dental Clinic at ...Nihon University School of dentistry in Matsudo. At first her mother complained about the asym metry of her face with alveolar bone protrusion around right buccal area above the maxillary 1 st and 2 nd primary molars when she was 9 years 3months old. The panorama X-ray photograph indicated impermeable frosted glass images with a width of 3×3cm around right the maxillary bone. When she was 10 years and 5 months of age, Apon iwspection the bone protrusion area was seen to be enlarged and was increased in density with suspected maturation of abnormal bone at the frosted glass images with 5×5cm width of using panorama X-ray photograph. Differential diagnosis in bone disease such as this case should be performed not based on clinical manifestation and X-ray findings but also histopathological findings and bone scintigram etc. As the bone protrusion was diagnosed temporally as Based on these findings, we will observe the bone size, function and esthetics, and have to choose the treatment method of either total or partial surgical resection.
We experienced endodontic treatment for the upper central incisor with malformed process contiguous to the cleft plate. The sharp pain on the ulcer at the oral mucosa of the inner upper lip was ...caused by continuous stimulation by the malformed tooth. We conducted an examination of the malformed tooth using 3 DXTM (Morita Co.) in order to understand the complex form of the pulp chamber. The following results were obtained. 1. From the 3 DXTMim ages, we confirmed that the pulp chamber in the labial process was connected to the pulp chamber of the original central incisor. 2. Pulp exposure was found in the labial process when we adjusted the crown form of the malformed tooth we therefore performed pulpectomy and root canal filling with the gutta-percha point on the complex form of pulp chamber. 3. We are continuing to observed progress of the malformed tooth, and inserted a temporary crown. The patient had no ulcer and sharp pain after treatment, and maintained a good oral state.
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