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Volume 47, Issue 1
Displaying 1-17 of 17 articles from this issue
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Takeshi Sueda1980 Volume 47 Issue 1 Pages 1-8
Published: 1980
Released on J-STAGE: October 08, 2010
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Shuichiro Fuse1980 Volume 47 Issue 1 Pages 9-21
Published: 1980
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSTo define the functional significance of the disc of the temporomandibular joint, 80 rats aged 2, 5, 12, 20, 30, 40, 60 days were used in this study. After weaning they were separately fed on solid and powder diet. After perfusion, the condyle with the articular disc was removed. The specimens were treated by the orthodox procedures for electron microscopy. Fiber architecture of the developing discs was examined electron microscopically.
1. Scanning electron microscopically, the primordial ridge, which is the foundation of the typical ridge on the upper surface of the adult disc, appeared 12 days after birth in the sucking rats, and its formation was completed 40 to 60 days after birth in the rats fed on solid diet.
2. Transmission electron microscopically, in the fiber arrangement the disc was observed to be a tendon-like tissue in the 40 to 60-day-old rats fed on solid diet.
3. In the 40 to 60-day-old rats fed on powder diet, the disc was still in the suckling stage.
4. The developing disc changed its surface structure adapting itself to the properties of the different kinds of diet after birth, and also its arrangement of the collagen fibers responding to the mechanical stress applied to the joint during mastication.View full abstractDownload PDF (11142K) -
Yu Hashimoto1980 Volume 47 Issue 1 Pages 22-56
Published: 1980
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe histological changes of the epithelial attachment after the preparation of the abutment tooth were investigated to make clear the relationship between the dental restoration and the gingiva.
In this study, four monkeys were used, and the shoulderless type preparation was carried out according to the routine clinical procedures. After the tooth preparation, the animals were sacrificed at 0 hour, 1, 2, 4, 7 and 14 days. Histological sections of the gingiva with the tooth were observed light and electron microscopically.
It was observed that the epithelial attachment was injured in various degrees at 0 hour. After 1 day, it showed that there was almost no difference compared with that at 0 hour. However after 2 days, the epithelium began to attach to the surface of the prepared tooth where the epithelium was not seriously injured.
From after 4 days, by transparent electron microscopic investigation, the epithelial cell became attached to the surface of the prepared enamel or dentin via the amorphous layer and hemidesmosomes were observed in this area of the cell membrane.
The epithelium healed and covered completely the marginal gingiva within 4 to 7 days except for the epithelium which was injured seriously.View full abstractDownload PDF (31678K) -
Hiroyuki Kaneda1980 Volume 47 Issue 1 Pages 57-97
Published: 1980
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was to investigate the relation between the gap existing around the hydroxyapatite ceramic implant and bone formation.
In the adult dogs, in which P3, P4, M1 had been extracted, holes were made in the mandibles of the dogs 3 months after the extraction and apatite ceramics were inserted so as to have the size of the gaps between the apatite ceramics and the mandibular tissue become 50, 100, 200 and 400μm. The dogs were sacrificed at 5, 10, 15, 30, 60 and 120 days after insertion. The mandibles were isolated and histologically examined. In the gaps over 100 μm, the bone formation begins in the lower part at 5 days after insertion and in the entire part at 10 days. At 15 days the bone formation begins in every gap and all of the surface of the apatite ceramics is covered with the new bone. At 30 days most of the gaps are filled with the new bone which becomes a compact bone after 30 to 60 days. And in the gaps over 100μm the lamellar bone is formed. As the result of this study, in the gaps over 100μm, the tissue differentiation and bone formation proceed more rapidly than in the gaps of less then 100μm.View full abstractDownload PDF (28468K) -
Koji Kino1980 Volume 47 Issue 1 Pages 98-134
Published: 1980
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSSince 1974, with Dr. Ohnishi the author has been trying to develop a method for the endoscopic examination of the temporomandibular joint for clinical application.
The aim in this paper is to elucidate the histological characteristics of the inner surface, especially the synovial folds, of the temporomandibular joint through the endoscopy. Eleven upper joint cavities of fresh human cadavers were examined endoscopically, macroscopically and histologically.
There were many folds on the posterior surface of the disc adjacent to the mandibular fossa. Generally, the synovial membrane was composed of fine collagenic fibers, and some of these fibers were arranged in a wave-like configuration and were visible as small folds protruding from the large folds.
Many fine folds were observed on the posteriomesial region of the disc when the jaw opened, but when the jaw closed they accumulated to form large ridge-like folds. At the subsynovial layer of these regions, the fibrous layer which was abundant in elastic fibers extended from the petro-tympanic fissure to the mesial side of the condyle with the opening of the jaw, but became U-shaped with the closing of the jaw.
The subsynovial layer in the anterior region of the disc was generally dense, but was observed to be somewhat looser beneath the folds.View full abstractDownload PDF (18583K) -
Kunimichi Soma, Miyoko Hatate1980 Volume 47 Issue 1 Pages 135-144
Published: 1980
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was to examine the usefulness of the application of the Fourier Series for the morphological analysis in orthodontics.
The sample consisted of serial cephalograms of 50 Japanese children taken at 7, 11 and 15 years of age. The shape of the mandible was expressed by the length and the angle from the midpoint of Me.-Ar. to each point along the lower border of the mandible. In order to eliminate the size factor, each mandible was standardized by using Me.-Ar.
The suitability of the application of the Fourier Series for the analysis of the cephalometric data was proven to be effective from the following standpoint;
1) Screening of the amount of information of the raw data series by using minimal coefficients.
2) Statistically obtaining a mean curve representing a certain age, sex or type of occulusion, etc.. It can be a great advantage in making a comparative study.
3) Classification of several different patterns with the pentagon diagram composed of five independent minimal coefficients.View full abstractDownload PDF (956K) -
(Part 2) Examination of Its Clinical ApplicationHiroshige Kato1980 Volume 47 Issue 1 Pages 145-159
Published: 1980
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSIn the previous study, the author reported that the DC-4978 thermosetting polyurethane was the most efficient material for orthodontic ringlets.
The purpose of this paper was to examine the clinical application of the newly produced ringlets made from DC-4978.
Four different forms of this new material were compared with the same kind of currently available commercial material.
Using these five samples, the following tests were carried out:
1) Basic examination for tensile strength, aging effect, and permanent elongation; 2) Clinical examination of the amount of tooth movement after four weeks, time course changes of tooth movement during the four weeks, and physical properties after clinical use.
The findings were as follows: 1) The DC-4978 series proved to be of better quality than the commercial material as an orthodontic ringlet from all the basic physical property tests, especially the aging effect; 2) Among the DC-4978 series, the amount of tooth movement after four weeks was dependent on the thickness of the ringlet; 3) The degree of tooth movement using these two different materials showed a great difference after two weeks of clinical use due to the residual stress.View full abstractDownload PDF (6520K) -
Masami Yonemitsu, Keiichi Takei, Shuji Suizu1980 Volume 47 Issue 1 Pages 160-166
Published: 1980
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSMinamidaito Island is a rural village and it is difficult for the villagers to have a chance to receive dental treatment because of transportation difficulty.
So the Department of Health of the Okinawa prefecture and eight dental shcools in Japan proper work in close cooperation to provide dental treatment using mobile units to the people of the islands in Okinawa. We compared the oral state of the schoolchildren in 1979 with that in 1968 when the staff of the dental mobile units visited the Minamidaito Island for the first time and found the following findings:
1) No marked difference was found in the prevalence of DMF.
2) Decayed tooth rate was decreased and the filled tooth rate was increased in 1979.
3) The number of schoolchildren who answered “I have a toothache now” was decreased remarkably in 1979 compared with eleven years ago, and this was supposed to be the result of 2) .
4) We feel keenly that primary prevention was needed in the isolated islands where dental care was difficult to receive like in the Minamidaito Island.View full abstractDownload PDF (1982K) -
Yoshiaki Ono, Hiroshi Ono1980 Volume 47 Issue 1 Pages 167-174
Published: 1980
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSWhen the cephalograms are taken, the child's head is, as a rule, immobilized on the Cephalostat with his Frankfort horizontal plane being parallel to the floor. But it sometimes happens that the exposure is made while the head tilts somewhat upward or downward around the transmeatal axis. So it is necessary to study the influence of the head positioning on the image of the cephalogram in order to evaluate the growth changes with series of 45-degree oblique cephalograms.
The horizontal and vertical measurements were made mainly on the mandible of two dried skulls of Hellman's dental age IIA and IIIB. The measurements of the space posterior to the dental arch by three reference planes for measurements were also compared. The results were as follows:
1) In the horizontal measurements, the influence of the head position on the image of the 45-degree oblique cephalogram was negligible and the enlargement and distortion can be regarded as uniform.
2) In the vertical measurements, the influence of the head position was obvious and some kind of correction or relative evaluation will be needed.
3) In the measurements of the space posterior to the dental arch by the three reference planes, the influence of the head position was negligible.View full abstractDownload PDF (812K) -
Minoru Takagi, Tadao Soda1980 Volume 47 Issue 1 Pages 175-181
Published: 1980
Released on J-STAGE: October 08, 2010
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[in Japanese]1980 Volume 47 Issue 1 Pages 182
Published: 1980
Released on J-STAGE: October 08, 2010
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[in Japanese]1980 Volume 47 Issue 1 Pages 183
Published: 1980
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (161K) -
[in Japanese]1980 Volume 47 Issue 1 Pages 184
Published: 1980
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (137K) -
[in Japanese], [in Japanese]1980 Volume 47 Issue 1 Pages 185
Published: 1980
Released on J-STAGE: October 08, 2010
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[in Japanese]1980 Volume 47 Issue 1 Pages 186
Published: 1980
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese]1980 Volume 47 Issue 1 Pages 187
Published: 1980
Released on J-STAGE: October 08, 2010
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1980 Volume 47 Issue 1 Pages 188-198
Published: 1980
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (1628K)
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