All issues
Volume 21 (1954)
- Issue 4 Pages 153-
- Issue 3 Pages 87-
- Issue 2 Pages 51-
- Issue 1 Pages 1-
Volume 21, Issue 3
Displaying 1-10 of 10 articles from this issue
- |<
- <
- 1
- >
- >|
-
Kinai Tomita1954 Volume 21 Issue 3 Pages 87-92
Published: 1954
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe problem, which dentition the molar teeth belong to, have been studied by many authors without any definite solution. Having found some defects in previous reports, I adopted a new method in research and confirmed the fact that pig's molar teeth develop from the deciduous dental lamina.
Fetuses and newly born pigs were used as materials for my research work. I observed care-fully the specimens which unfixed materials were dissected so as to leave the epithelial part only, serial sections and some reconstruction models.
By the experimental research, I obtained the result that dental lamina, which had developed the deciduous molar teeth, extended backward connecting with the oral epithelium and then developed into the molar teeth in the same process the other deciduous molar teeth had developed.View full abstractDownload PDF (9314K) -
Takatoshi Ohtani1954 Volume 21 Issue 3 Pages 93-102
Published: 1954
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSHistological consideration was made in 244 cases of maxillo-oral cancer which consisted of those described in the author's previous papers and some more cases experienced in other institutions.
According to the histological finding, they were classified into the following four types:
1. Carcinoma simplex,
2. Carcinoma stratum non-differentiatum,
3. Carcinoma stratum differentiatum, and
4. Adenocarcinoma or malignant epithelioma of the salivary gland.
Incidence in their localization and hitological findings of each type were discussed.
Consequently the study on the relationship of each histological type to their prognosis revealed that the prognosis of carcinoma stratum differentiatum and adenocarcinoma or malignant epithelioma of the salivary gland can be considered more favorable in comparison with that of other types.View full abstractDownload PDF (4691K) -
Setsuo Hara1954 Volume 21 Issue 3 Pages 102-108
Published: 1954
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSIt is a well-known fact that the anodal polarization produces the decrease of the excitability of tissues, though the clinical application of this fact has been neglected for a long time.
In 1950, Dr. K. Suzuki succeeded in the clinical application of this fact in the field of the dental practice, naming it “Electro-Anesthesia”. The effect of “Electro-Anesthesia ”, however, has been judged subjectively, mainly based on the statement of the patient.
The present anther measured the spinal reflex time of frogs regarding their prolongation by the “Electro-Anesthesia” as an objective evidence for the effectiveness of the “ Electro-Anesthesia”.
The results obtained in 60 frogs are as follows,
1) The spinal reflex due to the mechanical stimulation (pintching the toe-tip with pincette) was prolonged at the strength of anodal polarization of 12-14μA and 32μA.
2) The spinal reflex time due to the chemical stimulation (dipping the toe-tip into 3% acetic acid solution) was prolonged at the strength of anodal polarization of 12μA and 28μA.
3) The spinal reflex time due to the thermal stimulation (dipping the toe-tip into the hot (43°C) Ringer solution) was prolonged at the strength of anodal polarization of 18μA and 42μA.View full abstractDownload PDF (953K) -
Masumi Ishibashi1954 Volume 21 Issue 3 Pages 108-117
Published: 1954
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSAbout 482 front teeth, the relationship between the resorption of the alveolar-bone and toothmobility were observed by using the measuring apparatus of tooth-mobility appling a dial gauze.
And the fundamental study was made by using acric artificial teeth which have different length of roots.
The results obtained are as follows:
1) Tooth-mobility were gradually increased with nearly same rate as the resorption of the alveolar-bone as far as the resorption were limitted within 1/2-2/3 part of the root fromthe crest, but when the resorption were proceeded more over the tooth-mobility were suddenly increased.
2) Generally in the cases which have the same degree of the absorption from the crests and yet have different length of the roots, it was founded that the longer were the roots of teeth, the smaller the mobility of the teeth became.
3) On the contary, in the cases which have same amount of alveolarbone and their root-length were different (namely their degree of the absorbtion were different), it was founded that the shorter the roots of teeth, the smaller the mobility of the teeth became.View full abstractDownload PDF (4426K) -
Hachiro Nakajima1954 Volume 21 Issue 3 Pages 118-123
Published: 1954
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSMany methods have been described for the preoperative hand disinfection so far, but recently quaternary ammonium compounds and Hexachlorophene are widely used.
First, the bacteriological experiments were made on the scrubbing with lysol and modified technic of Fürbringer's method, which has been being adopted until recently in our clinic.
Next, the comparative experiments were made on various technics of scrubbing with the Hyamine solution and the G-11 soap containing 2 per cent of Hexachlorophene.
The results obtained are as follows:
1. The modified technic of Fürbringer's method is bacteriologically more effective in comparison with various technics of scrubbing with G-11 soap and Hyamine solution. But it irritates the skin, takes much more time and is troublesome.
2. Lysol has little utility value as a hand disinfectant.
3. Single scrubbing with G-11 soap is not so much effective as enthusiastically claimed.
4. The 1: 100 Hyamine solution used carefully is effective by itself. But 5-minute scrubbing with G-11 soap followed by 3-minute washing with the 1: 100 Hyamine solution shows almost the same effect as that of modified technic of Fürbringer's method. Moreover it causes little irritation of the skin.View full abstractDownload PDF (815K) -
Yukihiko Suzuki1954 Volume 21 Issue 3 Pages 123-130
Published: 1954
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe root canal filling with paste has such advantages as continuous germicidal effect, prevention of re-infection of the root canal and promotion of the healing in the apical wound.
However, it is not so easy to fill up a root canal with paste perfectly on account of difficulty of the manipulations, though “ Lentulo stopper” has been used as the most excellent instrument.
Then the author tried to find out more suitable instruments and devised seven types of spiral filling instruments. The efficiency of them were compared.
The types of these instruments were as follows:
No.1 File type with square form in the section.
No.2 Reamer type with triangle form in the section.
No.3 Flat type with rectangle form in the section.
No.4 Lens type with convex lens form in the section.
No.5 Wood drill type with carved spiral.
No.6 and No.7 Lentulo stopper type.
From the data of this experiment, No.3 and No.5 among them showed the most favorable results.View full abstractDownload PDF (7023K) -
Isamu Nakazawa, Takeshi Yamazaki1954 Volume 21 Issue 3 Pages 131-134
Published: 1954
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSNo one of us will not recognize the fact that the retention coefficient of the complete denture has much to do with the weight of denture itself. However, the vulcanite denture base material has quitely given place to the acrylic resin in these ten years, so it will easily be imagined that the mean value of the weight of acrylic complete denture might as much differ from that of the vulcanite complete denture as at least the difference of specific gravities between these two base materials. On the mean weight of the vulcanite complete denture was it reported in 1942 by Nakazawa and others, but none on the acrylic. This reminded us of weighning the finished acrylic complete denture and measuring the sagittal (length) and transverse (breadth) diametre of the artificial dental arch. The“breadth”what we mean, of the artificial dental arch is the distance of a contact point of M1 and M2 on one side from a point on the other side and the“length”is a line drawn from a contact point of both middle incisors to the“breadth”.
The results obtained were as follows:
1b) Mean-Age of patients: Male 61.9 y. and female 52.8 y..
2) Weight and size of dentures were on the average higher in male than in female, and in upper than in lower. (Tab. 1)
1a) 353 acrylic complete dentures (upper 188, lower 165) of 125 patients (male 52, female 73) were examined and studied statisticaly.
3) Mean weight of the acrylic complets denture was less than that of the vulcanite just so much as correspondent to the difference between the specific gravities of resin and vulcanite. (Tab.1 & 2)
4) There was a signiflicant correlation between“weight”and“breadth”but no signifficant correlation between“weight”and“length”. This is probably according to that the“breadth”of artificial dental arch is indicating the comparative size of the alveolar arch, but the“length” does not.View full abstractDownload PDF (526K) -
Takao Fusayama, Katsumi Yoshizawa, Kazuo Kurosu1954 Volume 21 Issue 3 Pages 135-140
Published: 1954
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSAt first the changes of hardness and dimension of the completed hydrocal dies by lubricating with separating medium for wax preparation were measured with the equipment deviced by the author. Water soaking lowered their hardness which was recovered by drying in air for one day, but glycerinsoaking lowered it rather slowly, irreversibly and progressively. Both caused superficial shrinkage during soaking and body expansion for one day after soaking and body expansion for one day after soaking. Vaseline caused little change of both hardness and dimension.
Then, changes by soaking the dies in saturated ZnSO4 solution were measured. This treatment genarally lowered the hardness, more severely in fully hardened and well dried dies which absorbed more ZnSO4. It also caused superficial shrinkage during soaking and body expansion for one day after soaking. Some dies, which absorbed more ZnSO4 or failed to be washed after soaking, were spoiled by crystallization of ZnSO4 on their surfaces.View full abstractDownload PDF (2863K) -
Kenjiro Takahashi, Kinai Tomita, Yoshimitsu Miyakawa1954 Volume 21 Issue 3 Pages 141-144
Published: 1954
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSClinical use of TM-cone was investigated in 231 tooth-extractions of 165 cases and the saliva level of the TM-cone was measured in 15 cases of them.
1. In their clinical use the incidence of discomforts were much less than in P.C. cone precionsly reported and favorable results were obtained.
2. The saliva level of TM could be maintained between 0.18 μg/cc in minimum and 0.85 μg/cc in maximum, chowing the maintenacs of fairly remarleable effective level.
3. As the TM-cone is highly stabile even in pH 2 to 4, oxidized cellulose was applied together in 62 tooth-extractions of 39 cases with excellent results in preventing from hemorrhage.View full abstractDownload PDF (464K) -
Tetsuya Kondo1954 Volume 21 Issue 3 Pages 144-146
Published: 1954
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSA case of trigeminous neualgia appeard in a young student, and it is supposed to be symptomatic. The intense symptoms were disappeard by pulp extripation of 6 and 4, , but the etiology could not be cleared.View full abstractDownload PDF (328K)
- |<
- <
- 1
- >
- >|