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Volume 57 (1990)
- Issue 4 Pages 457-
- Issue 3 Pages 363-
- Issue 2 Pages 273-
- Issue 1 Pages 1-
Volume 57, Issue 2
Displaying 1-9 of 9 articles from this issue
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Imao Sunada1990 Volume 57 Issue 2 Pages 273-280
Published: 1990
Released on J-STAGE: October 27, 2010
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Ikuo Arakida1990 Volume 57 Issue 2 Pages 281-313
Published: 1990
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe purpose of this study was to investigate the movement of the obturator framework and abutment tooth and to find a method to improve its retention, support and stability.
The model and framework in this experimental study simulated the posterior portion of the resected maxilla and obturator framework. The movement of the framework and abutment tooth under loading on the resected side were observed. And the retentive force under loading or pulling on the resected side was measured on each retainer designed by the three different paths of placement.
The findings were as follows:
1. The typical movement of the framework and abutment tooth was seen under loading on the resected side. The framework rotated with a movement of the center of rotation from the middle of the residual palate to the resected and occlusal direction. And sliding on the palate to abutment direction was observed.
2. The abutment tooth inclined to the resected side, and also the mesio-distal and axial movements were observed.
3. The path of placement in designing affected the retentive force under loading or pulling force.
4. The optimum path of placement in designing the obturator and the method of finding it were discussed from the standpoint of retention and stability.View full abstractDownload PDF (6873K) -
Toshiyuki Noma1990 Volume 57 Issue 2 Pages 314-334
Published: 1990
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe purpose of this study is to find the cause of the variation of the occlusion and the shape of the maxillo-facial components in the Japanese children at the IIA stage in comparison with the Japanese monkeys. The human materials consist of lateral and P. A. cephalograms of 26 children with a mean age of approximately 4.5 years. The monkey materials consist of dry skulls and their lateral cephalograms. They are categorized into four classes : 18 juveniles, 16 subadults, 17 female adults, and 17 male adults.
The factor analysis is employed in this study on 17 measurements which reveal the structure of the maxillo-facial components.
The factors of the human children are like those of the Macaca juvenile and female adult. These factors show a tendency that the growth direction of the maxilla is correlated with the cranial base angle and the width of the maxillo-facial components is correlated with its depth. However, as to these factors, human mandibular measurements have a much lower factor loading than those of the Macaca. Contrary to the human, the Macaca's mandibular measurements at every stage and sex are well correlated with the maxillary measurements. These findings suggest that the variation of the human occlusion and the external shape of the maxillo-facial components should be higher than that of the MacacaView full abstractDownload PDF (3562K) -
Shigeyori Inage, Saburoh Kurihara, Toshio Tuchiya, Ikuo Morita, Fujio ...1990 Volume 57 Issue 2 Pages 335-352
Published: 1990
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSelectron microscopies in comparison with that in enchondral ossification. The following results were obtained:
1) In the rat tibial articular cartilage, the extracellular matrix proceeding from the transitional to the hypertrophic zone consisted of the following three layers from the proximal: the first layer in which ruthenium red positive granules were densely populated and thin collagen fibrils diffusely arranged but few matrix vesicles were observed ; the second one containing numerous matrix vesicles and slightly thick collagen fibrils ; and the last one in which the thick collagen fibrils were observed while matrix vesicles and ruthenium red positive granules were few.
2) In the calcified regions in the extracellular matrix of MC3T3-E1 cells, the regions of alveolar new bone formation due to orthodontic tooth movement and the calcified regions in the interparietal suture expanded mechanically in vitro, the number of matrix vesicles was less than those in the regions of enchondral ossification.
3) Ruthenium red positive granules were fewer in the regions of alveolar new bone formation after the orthodontic tooth movement than in the calcified regions of cartilage.
4) The observation on MC3T3-E1 cells revealed the two different possibilities of the processes of calcification: the calcification induced by matriView full abstractDownload PDF (33891K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1990 Volume 57 Issue 2 Pages 353
Published: 1990
Released on J-STAGE: October 27, 2010
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[in Japanese]1990 Volume 57 Issue 2 Pages 354
Published: 1990
Released on J-STAGE: October 27, 2010
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[in Japanese]1990 Volume 57 Issue 2 Pages 355
Published: 1990
Released on J-STAGE: October 27, 2010
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[in Japanese]1990 Volume 57 Issue 2 Pages 356
Published: 1990
Released on J-STAGE: October 27, 2010
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[in Japanese]1990 Volume 57 Issue 2 Pages 357
Published: 1990
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (1992K)
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