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BIOCHEMICAL STUDIES OF ALVEOLAR BONE
Get PDF1) From the rabbits injected 45Ca and 32P, various parts of mandible and diaphysis of femur were obtained and the contents of water and organic matters and radioactivties in every bone sample were determined. The diaphysis of femur contained about 10% of water and 26% of organic matters. The alveolar septa contained about 23% of water and 37% of organic matters, and the other parts of mandible contained 11-16% of water and 25-30% of organic matters. The radioactivities of bone reached a maximum at approximately 6 hours after the injection of isotopes and distributed in alveolar septa about twice higher than in the other parts of mandible and diaphysis of femur. The disappearance curves for radioactivities from various parts of bones could be expressed as a series of two exponentials and the curves were almost parallel in each sample. 2) After the administration of 45Ca and 32P the femur, mandible and vertebra were obtained and they were powdered and fractionated by Manly-Hodge’S floatation method. The heavier fractions contained less organic matters but the specific gravities of these fractions were not proportional to organic contents. The specific activities of 1.9-2.0 fraction from mandible and femur were about 10 times higher than those of 2.1-2.2 fraction and 3-4 times higher than those of 2.0-2.l fraction. On the other hand the specific activities of each fraction from vertebra showed less activities than those fraction obtained from femur and mandible, and the specific activities in 1.9-2.0 fraction obtained from vertebra were about twice higher than those of 2.0-2.l fraction. The disappearance curves for radioactivities from each fraction were almost parallel. 3) The fractionated bone powders were extracted by ethylene diamine to remove the organic matters and each extracted bone Sample was used for X-ray diffraction studies. From the data of X-ray diffraction and low angle X-ray scattering, it seemed that the size of crystal in every bone fraction was in order of the specific gravity 2.1-2.2, 2.0-2.1 and 1.9-2.0 fraction according to largeness and in the same specific gravity fraction the size of crystal was in order of the femur, mandible and vertebra
A cross-sectional study on eating behavior of nursery school children and parents’ perceptions of their children’s eating problems
Get PDFObjectives: Although dental support is important for the healthy development of dietary function, stud- ies on eating behavior and oral function in early childhood are limited. This study aimed to clarify dietary problems in nursery school children and parents’ perceptions of their children’s diet.
Materials and Methods: By using a self-administered questionnaire, the survey was conducted on 371 parents of children aged 3–6 years attending seven nursery schools in the Tokyo metropolitan area.
Results: Regarding dietary problems, 55% of the parents reported walking around during the meal, 25% shared chewing with mouth open, and 29% stated difficulty in smooth swallowing with a mouth filled with food. These problems were significantly associated with decreased quantity and longer time of the meal, which were major concerns of the parents. Although no parent consulted dental pro- fessionals regarding dietary problems, 39% of theparents agreed about the need for dentistry sup- port on children’s diet.
Conclusion: This study on young children’s diet indi- cated that oral functional problems in mastication and swallowing underlie dietary problems such as decreased quantity and longer time of the meal, and a considerable ratio of parents expected support from dentistry for their children’s diet
STUDIES ON THE SEPARATION OF VARIOUS HORMONES BY THE HIGH VOLTAGE PAPER-ELECTROPHORESIS I. ON THE PREGNANDIOL GLUCURONIDE IN URINE (PRELIMINARY REPORT)
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DENTAL CARIES AND NUTRITION AMONG JAPANESE
Get PDFDental caries is one of the important national health problem in Japan, especially for school children since long time ago. Method of diagnosis of dental caries is prefered the palpation method with sharp needle tip for inspection method in early stage of the affection 1). According to the national nutrition survey 2) by the Welfare Ministry, the incidence of dental caries reaches already in early infancy such as 2 to4 years old to about 60 per cent for both sexes, increasing gradually with increasing age (Table 1). At the time of teeth exchange the percentage figure drops once a little to increase again thereaftr with growing age (Graph 1)
ROLE OF DENTOGINGIVAL SPLINTER OF ACRYLIC RESIN FOR THE INCREASE OF LACTOBACILLUS IN THE MOUTH
Get PDFDeep learning based denoising algorithm on ¹⁸F-FDG PET/CT for detecting hepatic metastasis
Get PDF¹⁸F-fluorodeoxyglucose positron emission tomogra- phy/computed tomography (¹⁸F-FDG PET/CT) is a widely used imaging modality for the detection of liver metastases. Recently, deep neural networks (DNNs) have demonstrated excellent performance in image denoising. This study aimed to assess the performance of a deep learning-based denois- ing algorithm, the Advanced Intelligent Clear-IQ Engine, for ¹⁸F-FDG PET/CT images in the detection of liver metastases. A total of 14 histopathologi- cally proven cancer patients with liver metastases who underwent ¹⁸F-FDG PET/CT between May 2020 and August 2022 were included in the study. The number and size of liver metastases were recorded to compare the lesion detectability between deep learning-based (DL) images and conventional Gaussian-filtered (GF) images. Quantitative anal- ysis was performed using metrics including the contrast-to-noise ratio (CNR) of the lesion and the signal-to-noise ratio (SNR) of the liver. DL images detected 113 out of 168 lesions. The respective number for GF images was 99. Fourteen lesions that were missed in GF images were detected in DL images. All of these 14 lesions were with a diameter
≤ 10mm. In quantitative analysis, DL images showed significantly higher CNR and SNR than GF images. DL images improved lesion detectability, particu- larly for cases with small lesions