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Volume 22 (1955)
- Issue 4 Pages 207-
- Issue 3 Pages 135-
- Issue 2 Pages 67-
- Issue 1 Pages 1-
Volume 22, Issue 3
Displaying 1-14 of 14 articles from this issue
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Yoshitoshi Yamagata1955 Volume 22 Issue 3 Pages 135-145
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESS1) An attempt to make an artificial cyst of oral mucous membrane was succeeded in Hamster. After narcotizing by Ouropan-Soda, the cheek pouch of the Hamster was pulled out and disinfected. Then, the neck of the cheek pouch was thread in parallel at two points. The surface layer of the mucosa between two threads was cut in a ring, and it was separated rated from the submucosa. Since then, the end of the cheek pouch was replaced as it wasand sewed up. Consequently the end portion of the cheek pouch becomes an isolated cyst.
By utilizing above-mentioned artificial cyst, the author made an experiment on absorption power of oral mucous membrane as follows.
2) The mucous membrane appeared to be not absorbable to trypan blue when the mixed solution of saturated sodium Bicarbonate, hyaluronidase and trypan blue, a lipoidd unsoluble acid dyestuff, was injected into the artificial cyst.
3) The radioactive phosphorus P32 (15μc) was injected into the artifical cyst andft radioactivity of every viscera was calculated by means of Geiger-Mueller Counter. As the results obtained, radioactivity could be recognized and P32 was proved to have been absorbed from the mucous membrane in every viscera of every Hamster in 4 hours after injection.View full abstractDownload PDF (7860K) -
Kunitake Kimura1955 Volume 22 Issue 3 Pages 145-149
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSTooth extraction was made in 82 cases, while 20 cases without extraction at random Mwere used as a control. About 4 cc of blood was taken from V. mediana within 15 minutes after extraction and examined bacteriologically. As the results obtained bacteria were positive in 17 among 82 cases : streptococcus in 8 cases, staphylococcus in 8 cases and hay bacillus in one case.
Then the relationships of bacteria-positivity to tooth diseases, such as pericoronitis, periodontoclasia, etc., to the number of extracted tooth, to localization of the tooth, and to difficulty of extraction were statistically considered and summarized.
No difference could be seen between positive and negative cases in appearance of Postexodontic troubles, such as chill, fever, and headache.View full abstractDownload PDF (607K) -
II. Compression Test of Alginate Impression MaterialsMichio Kawakami1955 Volume 22 Issue 3 Pages 149-153
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe consequence of the compression test in Alginase impression materials was informe in former paper (1), but the test needs more time than handling in clinic. As the result of measurements in various way, the reported method is confirmed that it is effective way for quality determination.
Changing the ratio of impression paste-plaster has little effect for compressive strength.View full abstractDownload PDF (503K) -
Katsumi Yoshizawa, Tamotsu Osada1955 Volume 22 Issue 3 Pages 153-159
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSElectric phenomen of dental metal in mouth have been described and discussed in many papers, and the E. M. F. of dissimilar metals have been determined. On the other hand, it is well known that when a metal is immersed in electrite solution, electric current does occur between the tissues of high potential and those of low potential and corrosion of the metal is increased. We have determined the electric potential of similar dental metals and alloys in various condition of them as follows :
(1) Potential in physiological salt solution
1) Between polished and unpolished metals
2) Between polished and rough polished surfaces of metals
3) Between polished and corrosive surfaces of metals
(2) Potential in oral saliva
1) Between polished and rough polished surfaces of metals
2) Between polished and corrosive surfaces of metals
The results are as follows:
1) Our experiments appear to demonstrate conclusively that electric current will exist in the mouth even if the mouth contains similar dental metals alone.
2) The phenomen of polarization undoubtly reduces the current somewhat, but not to zero.
3) The potential difference is higher in physiological salt solution than in oral saliva.
4) The value of potential difference is due to the difference of surface fineness and the condition of corrosive substances.View full abstractDownload PDF (728K) -
Setsuo Hara1955 Volume 22 Issue 3 Pages 160-164
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe threshold of two points discrimination about touch sensation on the surface of human body shows the minimum at the tip of the tongue, and neither at the back nor margin of the tongue.
Generally speaking, the condition necessary for two points discrimination is the separa-tion of two sensory circles, so that the threshold depends primarily upon the extent of condensation of touch spots distribution.
The author made an experiment on the distribution of the touch spots on the tongue of the toad, taking, as the index, the action currents of the glossopharyngeal nerve which are initiated when a very small area of the tongue surface is stimulated.
The toad is kept in the back position, and the action currents are led off by a pair of silver wire electrodes, connected to a Braun tube through a R. C. coupled amplifier.
The tongue is flatly fixed with a pin outside the mouth. Touch stimulation is given by closing the circuit of an electro-magnet, to the movable iron piece of which a pin of about 0.2 mm diameter is fixed.
Thus twenty-five points in 1 mm2 of the tongue surface, were stimulated by using a manipulator for adjusting the stimulating pin at every 0.25 mm distance.
Stimulation was repeated three times at every point, and the points which gave impules in every stimulation were considered to have a touch spot.
As a consequence, touch spots could be found in 12 out of 25 points on average in all of the above-mentioned three regions of the tongue, and not particulary abandunt on the tip.
Therefore, if the condition is the same on the human tongue, the deciding factors of the threshold of two points discrimination are not to be found in the condensed distribution of touch spots but in some differences in physical conditions of the tongue surface and also in the polyinnervation of the nervous system for the receptors (Meissner's corpuscle) .
The central nervous system and psychological factors may be concerned, too.View full abstractDownload PDF (2540K) -
Takao Fusayama, Masumi Ishibashi, Takao Kitazaki1955 Volume 22 Issue 3 Pages 164-169
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe adaptation of the direct acrylic resin fillings filled by various techniques were microscopically examined on their ground section surfaces and the following decisions were obtained.
1. The apertures caused between fillings and cavity walls by curing shrinkage of self curing resin are liable to occure first in the corners around cavity floors, then spread to all cavity floors and cover all cavity walls in the worst cases. Apertures at cavity margins were rather rare.
2. The acrylic resin filled by proper pressure or non-pressvre technique can readily adapt to the detailed hollows or sharp corners of cavity walls. However, the penetration of hardened resin in dentinal tubules was not recognized.
3. Drying cavity wall is quite indispensable for direct acrylic filling. Alcohol or chloroform may be used for drying cavity without significant difference of effect.
4. On filling with pressure technique, it is unadvisable to coat cavity walls with. monomer liquid before packing.
5. On filling with pressure technique, it is desirable to pack the powder liquid mix at doughy stage and press it at once.
6. The brush-on technique is the best way of direct acrylic filling in which no apertures are caused between filling and cavity wall by curing shrinkage of resin.
7. The once-pouring technique is not desirable because of the porocity of filling.View full abstractDownload PDF (4726K) -
Masao Nishibori1955 Volume 22 Issue 3 Pages 170-176
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe biological properties of Silicone resin and its adaptability as a canal filler are studied attempting to use many physical and chemical characteristics of resin for the base of filler and therapeutic material. This paper refers firstly to effect of resin on the activity of Antibiotics, secondly that of Calcium Hydroxyde on the Penicillin contained in Silicone oil and lastly its non affinityship with water.
The results are as follows.
1) Silicone resin has no effect on the potency of Penicillin or Streptomycin.
2) Penicillin in Silicone oil is not influenced by Calcium Hydroxyde.
3) The Silicone resin has remarkable non affinityship with water.View full abstractDownload PDF (5164K) -
Masao Toganau, Masahiro Harasawa, Natsuo Arihisa, Wataru Kondo, Masao ...1955 Volume 22 Issue 3 Pages 177-182
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSIt is strongly requested in dental practice that the anticorrosive measure always has to run parallel with the sterilization of hand instruments in their use. However, a definitive action of the sterilization often spoils their fineness, for instance sharpness of burrs and reamers or smooth rotation of hand peaces. To the anticorrosive agent vapor phase inhibitor (V. P. I.), dicyclohexyl ammonium nitrite, which was recently developed by Shell Oil Company for this purpose was examined for the dental usage.
Concentration of V. P. I. was coordinated with kind and concentration of sterilizing agents with respect of anticorrosive effect to the polished surface of a peace of pure iron as well as sterilizing effect against B. subtilis spore pasted on burrs with fine ground carious dentin. A practical representation found in above was that 10% formalin with 0.1% V. P. T. killed the spore within five minutes but did not rust the iron peace. A lubricator consisted of 330 cc water, 660 cc glycerol, 3.9 g neutral detergent did not inhibit the effect of the above solution in case of sterilization of a hand peace. Single use of 0.01% V. P. I. is still effective only by boiling sterilization.View full abstractDownload PDF (3037K) -
Katsumi Yoshizawa1955 Volume 22 Issue 3 Pages 183-185
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (4042K) -
Hiroshi Yamashita, Chieko Uehara1955 Volume 22 Issue 3 Pages 185-190
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSIn order to apply P-aminomethylbenzene-Methylsulfone (M.S.) to the infected root: canals, which is one of the derivatives of homosulfamine and has the strongest effect among them against anaerobic bacteria, both fundamental, and clinical experiments were conducted.
It was found that 5% concentration was recommendable in the case of local use. However, the effect was obstructed by gelatine at the same degree as homosulfamine was done. As for penetration into the tooth structure, the use of propylen glycol as a solvent was most favorable. It took 2.7 times application on an average to secure the complete negative culture by the compound mixed 10% M. S. solved by propylen glycol with 1% sulfathyazol.View full abstractDownload PDF (703K) -
Takao Fusayama, Setsuko Matsumoto1955 Volume 22 Issue 3 Pages 190-193
Published: 1955
Released on J-STAGE: December 08, 2010
JOURNAL FREE ACCESSThe smoothness of cavity walls prepared with various cutting instruments and methods was microscopically compared in their sections, as follows.
Little difference was observed between the wall finished with the dentate bur and the plain bur of same form. The fineness of the bur blades seemed to be more important for the wall smoothness, and the fine cut tapered fissure bur without crosscut made the best wall. Therefore, it is quite preferable to finish the cavity margins or marginal bevels with such burs (No. 600-602) .
Little difference was observed between the wall finished with chisel and that finished with burs.
The wall finished with the dry carborundum point was much coarser than those finished with burs, but it became a little smoother when the point was used under pouring water.
The walls cut with the diamond point were very rough in both dry and wet use, and so they must be finished with fine cut burs afterward. However, one should consider that the smoothness of the walls cut with carborundum or diamond points depends on the fineness of their crystals.View full abstractDownload PDF (2437K) -
Shigeichiro Matsuda, Yasuo Kobayashi1955 Volume 22 Issue 3 Pages 193-197
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSA 7-moth-old boy visited us, complaining of a swelling of soy-bean size at the alveolar ridge on the left upper incisor portion. It was already noticed since 7 days after his birth. Since then the swelling has not changed its size. The tumor was spherical in shape and attached to the alveolar ridge with a broad pedicle. Radiogram showed that the left upper incisor is located deeper in alveolar bone than other teeth. This was diagnosed as congenital epulis, follwed by surgical extirpation. The tumor has not shown a recurrence for these 5 months after operation.
The crown of the extracted incisor was completed, but the pulp was necrotic. Histo-logic examination of the epulis showed that it consists of a cellular mesenchyma resembling the dental papilla, in which epithelial islands are mingled. Large cell with abundant granular cytoplasm was not presented. It can be cosidered that this tumor belongs to a hamartoma participated with tooth germ, especially its mesenchymal tissue, in its origin.View full abstractDownload PDF (4822K) -
Toru Oka, Hiromi Someya1955 Volume 22 Issue 3 Pages 198-200
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSEither peroral administration or intramusclar injection of Irgapyrin was tried in 20 cases complaining of severe pain chiefly due to oral cancer or temporomandibular arthrosis. Painrelieving effect could be obtained by Irgapyrin in cases of oral cancer with severe pain, in spite of no such effect by other medicine, and in almost all the cases of arthrosis with quite favorable results.
Edema was sometimes obscured as a by-effect, but it disappeared soon by discontinuing its administration.View full abstractDownload PDF (326K) -
[in Japanese], [in Japanese]1955 Volume 22 Issue 3 Pages 201-202
Published: 1955
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (3300K)
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