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Volume 53 (1986)
- Issue 4 Pages 657-
- Issue 3 Pages 597-
- Issue 2 Pages 377-
- Issue 1 Pages 1-
- Issue supple Pages 9-
Volume 53, Issue 2
Displaying 1-16 of 16 articles from this issue
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Eiichi Masuhara1986 Volume 53 Issue 2 Pages 377-385
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
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Kenichi Yanagiya1986 Volume 53 Issue 2 Pages 386-405
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSAdriamycin (ADM) -silicone elastomer composite which is a delivery system for an anticancer agent was developed by the authors to facilitate local cancer chemotherapy of recurrent and metastasized tumors and chemoembolization of primary tumors. The characteristics of ADM release from this composite and its antitumor effects on Yoshida sarcoma were investigated in this study.
The ADM release in vitro was affected by the external fluids, the amount of ADM embedded in the sillicone elastomer, the surface area of the composite and the temperature of the external fluid, and it was enhanced significantly by the addition of glycine or D-mannitol to the silicone elastomer.
After the inoculation of tumor cells the mean survival period of the 10 rats administered with the composite was more than 46.8 days and their rate of survival for 60 days was 40%. However, the survival period of the 10 rats without the composite was 8.5±1.3 days and all of them died in 10 day.
Flow cytometric analysis showed that, in the tumor cells of the rats administered with the composite, more than 70% of the cells were in the G1 phase and the S, G2+M phase was decreased relatively. This tendency was seen for 5 days after the administration of the composite. Morphologically, vacuole formation, enlargement and the disappearance of mitosis of the tumor cells were observed. These results show that the antitumor effects of the composite actually remained for along time.View full abstractDownload PDF (6508K) -
—Experiment on Onlay Implantation for the Mandible—Mayako Matsumoto1986 Volume 53 Issue 2 Pages 406-452
Published: June 30, 1986
Released on J-STAGE: December 08, 2010
JOURNAL FREE ACCESSExperiment of the onlay implanting porous hydroxyapatite ceramic material (pore ratio: 65%) on the alveolar ridge of the mandible was conducted to investigate the clinical utility of the material for onlay implantation.
Extraction of the P2, P3, P4 and M1 from the adult dog mandible and alveoectomy of about 4.5cm long by 1 cm high and a thickness of the entire buccal-lingual width of the mandible were performed.
Two months later the impression of the superior surface of the mandible was taken and the material was adapted to the model.
Three months later a buccolingual incision was made on the mandible crest about 5mm posteriorly to the P1. Through this incision, an elevator was used to separate the mucoperiosteum, creating a tunnel. The material was inserted into the dissected pockets.
The implants were retrieved 1 week to 1 year after implantation. Histological examination demonstrated: After 1 week, bone formation begins around the mandible surface adjacent to the material; After 2 months, a large amount of bone forms inside the material; After 1 year, the compact bone forms on the inner and outer surface of the material.
These results indicate that the material is useful for onlay implantation in the oral and maxillofacial area.View full abstractDownload PDF (29077K) -
Shinsaku Takei1986 Volume 53 Issue 2 Pages 453-499
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was to investigate whether the implants penetrating the bone and mucosa of the maxillary sinus increased the risk of infection or impeded the normal bone formation.
In 16 adult monkeys, the premolars of the upper jaw were extracted. After 3 months, cylindrical apatite implants were implanted in each side so as to penetrate into the maxillary sinus. The monkeys were killed at 1 and 2 weeks and 1, 3, 6 and 9 months after implantation. The specimens of the maxillae with the implants were histologically examined by light microscopy. The implants were penetrating into the sinus in various conditions according to the site of implantation, the form of the sinus and so on.
Some of the implants introduced into the sinus were coverd with normal mucosa, the others perforating the mucosa.
In all cases, the bone formation around the apatite implants was normal and the bone was formed on almost the entire surface of the implants inside in the jaw bone.
In the case of the implants perforating the mucosa, the mucosa around the implants was more or less injured. But at 3, 6 and 9 months after implantation, no problematical situation was particularly recognized in the mucosa around the implants.View full abstractDownload PDF (29798K) -
Tomohiro Okano, Hau-Jen Huang, Hatsue Shibasaki, Naoyuki Yamada, Tadas ...1986 Volume 53 Issue 2 Pages 500-507
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSMeasures available for the diagnostic value of radiographic images were examined in the detection of the caries-like proximal enamel radiolucency. Systematic variations used in this study were the recording systems, mean density of the proximal enamel and horizontal projection angle. Performance was expressed in terms of a true positive (TP) answer coupled with the true negative (TN) answer and the receiver operating characteristic (ROC) analysis, obtainable by ten observers who were asked to detect the induced lesions in the radiographic phantom. The results showed that the TP value was inversely correlated to the TN value in the systematic changes of the recording systems and density, although both values seemed to express the nature of each observer in detecting the caries-like lesions. The ROC analysis data were correlated to the variations used. An analysis of the variance revealed that the observer variance was significant but had a relatively small effect compared to the other factors within our variations. These findings indicated that the ROC analysis complemented by the TP and TN values was more reliable for the evaluation of this specific diagnostic performance.View full abstractDownload PDF (951K) -
Etsuo Kurokawa1986 Volume 53 Issue 2 Pages 508-535
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSSeven temporomandibular joints from the cadavers were investigated to elucidate the histological structure of the temporomandibular ligament. Serial sections were made and stained for observation by light microscope.
The temporomandibular ligament was separated into the medial horizontal portion (the third layer of the lateral wall of the human temporomandibular joint) and the outer oblique one (the fourth layer) .
Both portions were attached to the outer surface of the articular tubercles and the lateral margin of the mandibular fossa as they entwined with each other.
The third layer was attached to the mandibular condyle somewhat posteroinferiorly of the lateral pole and the fourth was attached over broader area. The temporomandibular ligament was fundamentally composed of thin collagenous fibers called primary fibers (5-12μm in width) . These fibers were formed large bundles secondarily and were called secondary fibers.
In the third layer, the secondary fibers (50-15μm in width) were arranged densely and almost parallely. These secondary fibers were sometimes united with the primary fibers branching from the other secondary fibers. At the attached areas, the secondary fibers branched into primary fibers and these fibers penetrated into the bone in an entangled state.
In the upper region of the fourth layer, wavy primary fibers were arranged relatively densely. In the lower region, the thickness of the secondary fibers increased gradually. These secondary fibers (20-80μm in width) invaded the periosteum of the condyle.View full abstractDownload PDF (21866K) -
Shun-ichi Shibata1986 Volume 53 Issue 2 Pages 536-563
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSIt has been generally accepted that the chondrocytes in the hypertrophic zone degenerate and ultimately die during the endochondral bone formation. But a few authors, on the basis of the histological and experimental examinations, suggested that a small part of the chondrocytes do not die but are transformed into osteoblasts and osteocytes. So there is no agreement on the fate of the chondrocytes in the hypertrophic zone. To make a study on this subject, the author made observations on the structural features of the chondrocytes in the hypertrophic zone of the mandibular condyle.
The mandibular condyles of the S. D. rats (3 weeks old) are used in this study. Most of the chondrocytes of the mandibular condyle progress to hypertrophy, degeneration and ultimately die. But a small part of them survive and are released from the cartilage lacunae into the bone marrow. Moreover, the chondrocytes which survive are classified into two series. In one series, the chondrocytes herdly progress to hypertrophy and become “dark cells” in the bone marrow. In the other series, the chondrocytes progress to hypertrophy to some extent and become “light cells” in the bone marrow.View full abstractDownload PDF (15048K) -
Takehiro Kuroki1986 Volume 53 Issue 2 Pages 564-583
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe previous researches on racial differences in the crown trait and the dental arch morphology have often treated these two factors independently. The purpose of this study was to investigate, recognizing their racial differences, whether there are any association between them.
The sample consisted of plaster casts of dentition obtained from 142 Japanese, 109 Cancasian and 121 inhabitants of the Andes in Peru. The casts were preserved at the Department of Orthodontics of Tokyo Medical and Dental University.
The variations of 30 crown traits, categorized and quantitatively graded, were compared among three races using two methods. Chi-square test analyzed the frequency distribution of each crown trait. The other method analyzed the total variation of 30 crown traits in each sample by the computation of the parameter of similarity.
On the other hand, an interracial comparison of the dental arch morphology was made by superimposing the occlusal outlines of all teeth, each of which had been numerically expressed by polar coordinates of 36 points plotted equi-angulary on the occlusal contour.
The results were as follows:
1. Trait frequencies of shovel-shape, interstitial tubercle, groove pattern of the Y type and Carabelli's cusp were significantly different among the races examined, and the shovel-shape appeared to be a hereditary characteristic.
2. The dental arch morphology, especially in the anterior part, was different among the races.
3. The crown trait, particulary the shovel-shape, was related to factors composing the anterior part of upper dental arch; namely, the arch length, arch width and winging of the central incisors.View full abstractDownload PDF (2020K) -
[in Japanese], [in Japanese]1986 Volume 53 Issue 2 Pages 584
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]1986 Volume 53 Issue 2 Pages 585
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
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[in Japanese]1986 Volume 53 Issue 2 Pages 586
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
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[in Japanese]1986 Volume 53 Issue 2 Pages 587
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese], [in Japanese]1986 Volume 53 Issue 2 Pages 588
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (107K) -
[in Japanese]1986 Volume 53 Issue 2 Pages 589
Published: June 30, 1986
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (112K) -
1986 Volume 53 Issue 2 Pages 591
Published: 1986
Released on J-STAGE: October 08, 2010
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1986 Volume 53 Issue 2 Pages 592
Published: 1986
Released on J-STAGE: October 08, 2010
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