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積分球診寮室の光学的研究 : 第1報,積分球診療室の作製とその照度について
Get PDFapplication/pdf1) A clinic room in an integral calculus globe was made according to the basic experiments. By measuring the illuminance it was found that a diffused natural light having no shadows and soft light equally to daylight was succeeded to obtain. The light showed the same illuminance as the light from a north window in the daytime (1800～2000Lx) which is the best condition to observe the color tone of the teeth. This light is also suitable for the health of the eyes during long-time treatment. It is, moreover, good for the psychological stability of the patients. 2) Results of a comparison measurement of the illuminance showed that the lightest was the whole circuit, followed by Light A, Daylight, Light D. 3) Individually used, Light A, Daylight, Light D showed a fixed and homogeneous illuminance in all parts, but when the all Lights were used together, the illuminance value changed to unstable. 4) When medical instruments were carried in the room the illuminance of the integral calculus globe declined. 5) As for the floor, P-tiles had a lighter illuminance in comparison to grey carpet. 6) It was interesting that when medical instruments were carried into the integral calculus globe, the value of daylight fluorescent light became unstable. 7) The average illuminance of the preventive treatment room, which was used for the control, was 563 Lx when it was measured in 6 defferent places.journal articl
Bacteroides melaninogenicusのblak pigment (hematin)の抗菌活性
Get PDFapplication/pdfFrom cells of Bacteroides melaninogenicus, isolated from human gingival crevice deposits, the black pigment was extracted by the established methods. The extracted pigment was identified as hematin upon examination of its various properties. Extracted hematin from five different strains inhibited the growth of the many kinds of Gram positive bacterial species, in which Actionmyces viscosus and Barterionema matruchotii were very susceptible (Minimum Inhibitory Concentration=MIC, 25.0μg/ml) as Streptococcus mutans. In other species, Actinomyces, Strep, mitts, Corynebacterium parvlum, and Propionibacterium acnes were moderately sensitive. They were inhibited at a concentration of 50.0μg/ml. The same results were shown with the use of authentic hematin. There was a proportional relationship between hematin concentration and the squares of diameters of inhibitory zones on agar plates. Other tested strains grew almost normally even if they were exposed to hematin at concentration over 200μg/ml. A similar antimicrobial activity as hematin was detected, if not so markedly, in the pus obtained from inflammatory lesion produced by experimental mixed infection including B. melaninogenicus.journal articl
ヒ素化合物による赤血球膜浸透圧抵抗の変化
Get PDFapplication/pdfCoil planet centrifugation was used to measure osmotic fragility in rat erythrocytes treated with arsenic compounds in vitro and in vivo. Arsenic trioxide given orally to rats caused a significant increase in the osmotic fragility at a dose level of 20-120mg As/kg of body weight. However, in vitro tests on the erythrocytes, which were treated with 2-500μgAs/ml of blood for 1 hr. incubation at 37℃, no significant changes were observed. Monomethylarsonic acid and dimethylarsinic acid, known as metabolites of inorganic arsenic, induced no significant changes in the osmotic fragility in vitro tests on the erythrocytes. Moreover, these compounds did not show any changes even when rats received i. p. injection of 20mg As/kg of body weight. In case of sodium arsenate, oral administration of 60mg As/kg of body weight caused a significant increase in the osmotic fragility. In inducement of the osmotic fragility in the erythrocytes sodium arsenate appeared to be less active than arsenic trioxide.journal articl
積分球標準光源に関する研究
Get PDFapplication/pdfFor the dental clinic, the accurate evaluation of color tones of the teeth and of the oral mucous membrane is very significant. Using Model SF65 D-A and a large integral globe model, made by the author, the inner illuminance was measured. The result that the source of light within the integral calculus globe and the reflection were soft and homogeneous was successful. The details were as follows: 1) On the integral calculus globe Model SF65 D-A, the average value of the source of light D was 1176 Lx, and the average value of the source of light A was 838 Lx. The average value of D_ and A together was 2020 Lx. The illuminance was homogeneous on all parts. 2) D_ was a daylight lamp and A was reddish one. By adding light A to light D_, a reddish daylight, being diffused and soft, was obtained. 3) The reflection light on an integral calculus globe model, painted the surface with a titanium-dioxide (rutile type) emulsion paint, from 11 lamps was 1500～2000 Lx and was completely diffused and homogeneous. 4) The integral calculus globe did not cause any special noise but a little resound was felt at the center. 5) The calculation formula of the illuminance in the integral calculus globe is E (a, b)=2πI/√ ln (1+√/1+√) and with the exception of the places near the wall, the illuminance is approximately homogeneous. 6) Based upon above mentioned results a clinic room in an integral calculus globe was built. The source of light will be D_ daylight and A light. On the inner side a titanium-dioxide (rutile type) emulsion paint will be painted. As a result, the source of light will be a soft and homogeneous reflection light.journal articl
下顎骨前歯部にみられたAdenomatoid odontogenic tumor の1症例付,本邦74例の文献的考察
Get PDFapplication/pdfA case of adenomatiod odontogenic tumor appeared in the incisor region of the mandible of a 15-year-old girl was descrived in this paper. The lesion consisted of multilobular nest differently from the ordinary one, and was considered to recurrence because she had a past history of extraction of the embedded canine and the surrounding tumor 2.5 years ago. The whole tumor was resected with jaw bone intraorally, and palstic surgery was performed with the patient by transplantion of a piece of the ilium to the defect. No recurrence has been observed 3 years after the operation. An analysis of 74 cases of this tumor reported in Japan, including our own case, revealed the following data. The youngest is 8-year-old and the oldest 44-year-old, average age is 17.9-year-old. The tumor is much more common in females (58 cases out of 71 cases, 81.7%) than in males (13 cases, 18.3%). The mandible (39 cases out of 67 cases, 58.1%) is affected more often than the maxilla (28 cases, 41.9%). The tumor is predominant in the anterior region (46 cases out of 67 cases, 68.6%) than the molar region (18 cases, 26.9%), and very often accompanied with embedded teeth (47 cases out of 59 cases, 79.7%). The recurreuce has been documented in only 2 cases.journal articl
下顎骨にみられる歯間孔の数と大きさ
Get PDFapplication/pdfIn the observation of the interdental foramina and the small foramina on the internal surface of the alveolar process of the mandibular anterior teeth of 141 Indians, the following results were obtained: 1. The number of the foramina on the right side of the mandible was one or two in 36.17% respectively. The greatest number was 6, with the average of 2.03. Similar results were obtained on the left side. In the midline, the foramina were absent in 72.34%, while only one was found in 20.57% of those examined. The greatest number observed was 4, with the average of 0.38. 2. The foramina of right alveolar process were most frequently observed between the central and lateral incisors (96.46%), between the canine and premolar in 24% and on the lingual alveolar bone of the central incisor in 22%. Between the central incisor and lateral incisor, 2 foramina were found in 27 specimens (19.15%), and 3 foramina in 3 specimens (21.3%). 3. Small foramina found in the upper third of the interdental alveolar process between the central and lateral incisors in most of the specimens (93.62%). 4. The size of the foramina on the right side was most frequently 0.45mm in 20.98%, followed by 0.25mm in 20.28%, The largest diameter measured 0.85mm, with an average of 0.39mm. The foramina on the left side were also of similar size, the largest measuring 0.95mm. At the midline, the majority of the foramina (50.94%) measured 0.15mm, with the largest measuring 0.75mm and an average of 0.23mm. 5. The diameters of the foramina of the interdental alveolar process between the central and lateral incisors were largest on the right side of the mandible, with an average size of 0.46mm. The foramina of the upper third were especially large, averaging 0.47mm. Foramina on the lingual side of the lateral incisor were the next largest in diameter, with the average of 0.37mm, while those between the canine and first premolar averaged 0.32mm. 6. In the upper third of the internal surface of the alvenlar process of the mandibular anterior teeth, foramina were observed between both the right and left central and lateral incisors in 123 specimens (87.23%), on the right side only in 7 (4.96%), and on the left side only in 6 (4.26%). 7. Based on these observations, the foramina noted in the upper third of the interdental alveolar process between the central and lateral incisors of the mandible were called interdental foramina.journal articl
Gigantiform Cementomaの1症例
Get PDFapplication/pdfThe lesion appeared at the lower right first molar region of a 53-year-old woman. Radiographically, main radiopaque mass was well defined by radiolucent zone. Clinical diagnosis was odontoma. Histopathological findings from removed specimen were as follows: The irregular tumorous cementum resembling primary cementum was proleferrated, and there was no findings of mosaic-like structures in the cementum. Therefore, the lesion was diagnosed as gigantiform cementoma.journal articl
市販コンポジットレジンおよびグラスアイオノマーの機械的性質の検討
Get PDFapplication/pdfMechnical properties of two composite resins and a glass ionomer were evaluated. Composite resins were used to commercial products, such as Adaptic and Concise. A glass ionomer was Fuji ionomer. This report was described on the compressive strength and the hardness affecting by the elapsed time after setting, the ratio of universal and catalyste pastes, and the mixing time. Results were as follows; 1. The compressive strength of two commercial composite resins was 2,300kg/cm^2 at a day after setting. But, that of the glass ionomer was 1,800kg/cm^2 at 4 days. 2. Although the manufacture's directions have consulted to use a part of universal paste with a part of catalyste paste, on the Adaptic, mixing two parts of universal paste with catalyste paste and on the Concise, mixing a part of universal with two parts of catalyste, the compressive strength of composite resins was decreased. 3. The hardness of composite resins was unaffected by the proportioning the amounts of the pastes. 4. Vicker's hardness numbr of three products was from 85 to 105. 5. The influence of the mixing time to the compressive strength was unrecognized. But, the standerd deviations of the measurements for the compressive strength of specimens prepered by mixing for 60 seconds, were decreased to a half of them which were prepered by mixing for 30 seconds.journal articl
