The Bulletin of Tokyo Medical and Dental University最新文献_第5页

Joint epidemiological longitudinal dental survey in Nigeria, especially in comparison with that of Japanese. 尼日利亚联合流行病学纵向牙科调查，特别是与日本的比较。

The Bulletin of Tokyo Medical and Dental University Pub Date : 1993-03-01

K Kubota, N O Hollist, A O Olusile, M Yonemitsu, S Minakuchi, H Watanabe, K Ohsawa, M Ohnishi, Y Ono, S O Ajayi-Obe

{"title":"Joint epidemiological longitudinal dental survey in Nigeria, especially in comparison with that of Japanese.","authors":"K Kubota, N O Hollist, A O Olusile, M Yonemitsu, S Minakuchi, H Watanabe, K Ohsawa, M Ohnishi, Y Ono, S O Ajayi-Obe","doi":"","DOIUrl":"","url":null,"abstract":"Since 1980 we carried out a longitudinal dental survey in Ile-Ife, as a joint study with the dental school of Ife University, Nigeria, being supported by A Grant under The Monbusho International Scientific Research Program for ten years. One thousand one hundred seventy-one children and adults were examined in the 1991 survey. The data were compared with the data in the previous survey and Japanese survey. Results were as follows: 1) Caries prevalence rate and the average number of DMFT were still very low, especially showing that both the caries prevalence and the average number of DMFT decreased in the rural areas because the attrition proceeded faster than the caries, 2) Nigerian deciduous and permanent dentition were larger than in the Japanese in all items measured, 3) the condylar head was transformed from the round shape to the ultra-flat shape with age, 4) there was a fewer incidence of severe periodontal diseases despite of the marked deposition of calculus, 5) with respect to Nigerian foods, there was no difference between the rainy and dry seasons in both the urban and rural communities, 6) the weaning period of the baby is decided by their mother, taking care of the health of the baby, almost all babies at one year to two years and a few at three years and 7) the menu for the breakfast, lunch and supper of the baby was made considering the nutritional aspect of the baby.","PeriodicalId":22311,"journal":{"name":"The Bulletin of Tokyo Medical and Dental University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19445991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical properties of artificial teeth. 人工牙的机械性能。

The Bulletin of Tokyo Medical and Dental University Pub Date : 1993-03-01

K Shimoyama, T Uchida, M Nagao, K Odagiri, Y Shirasaki, T Tateishi

{"title":"Mechanical properties of artificial teeth.","authors":"K Shimoyama, T Uchida, M Nagao, K Odagiri, Y Shirasaki, T Tateishi","doi":"","DOIUrl":"","url":null,"abstract":"In selecting the teeth for fabrication of complete or partial dentures, each patient's anatomic and physiologic requirements and the properties of the artificial teeth themselves should be taken into consideration. The purpose of this study was to evaluate the mechanical properties of the artificial teeth by the static compression test and the impact test. Specimens were the lower first molar porcelain and resin teeth (Livdent FB-20 teeth by G. C. Co., Tokyo, Japan). All were of the same shape. In the static compression test, the fracture load and deformation of the artificial teeth were measured with an Instron-type universal testing machine at a cross-head speed of 1.0 mm/min. Elastic modulus, ultimate strength and absorbed energy were calculated. In the impact test, the acceleration of a falling impactor was measured with a drop impact apparatus. The load applied to the specimen was equivalent to 300N. Absorbed energy and deformation were calculated. The resin teeth showed a lower elastic modulus, higher fracture toughness and shock-absorbing ability than the porcelain teeth. Resin teeth should be selected when the first requisite is high shock-absorbing ability, and porcelain teeth should be selected when the first requisite is high masticating efficiency.","PeriodicalId":22311,"journal":{"name":"The Bulletin of Tokyo Medical and Dental University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19445989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on morphology of mandibular corpus and ramus influencing the eruption of mandibular first permanent molar. 下颌骨体支形态对下颌第一恒磨牙出牙影响的研究。

The Bulletin of Tokyo Medical and Dental University Pub Date : 1993-03-01

Y F Lin

{"title":"Study on morphology of mandibular corpus and ramus influencing the eruption of mandibular first permanent molar.","authors":"Y F Lin","doi":"","DOIUrl":"","url":null,"abstract":"The mandibular first permanent molar has been reported to be the first permanent tooth to erupt. However, according to the recent reports, a considerable increase in the number of children has been observed with the eruption of the mandibular first permanent molar after the eruption of the mandibular central incisor. The purpose of this study is to investigate whether there is any morphological difference in the mandible including the mandibular corpus and the ramus between the subjects with the mandibular first permanent molar erupting prior to the mandibular central incisor (Group A) and the subjects with the mandibular central incisor erupting prior to the mandibular first permanent molar (Group B). Lateral, posteroanterior, 45-degree oblique cephalometric radiographs and dental plaster models were used as the materials. Based on the data statistically analyzed, the results are summarized as follows: 1. No significant differences were found in the conventional angular lateral cephalometric measurements between the two groups. 2. No significant difference was found in the mandibular length between the two groups. 3. Significant differences were found in the mandibular corpus and the ramus between the two groups. In other words, the children in Group A have a narrower ramus, longer corpus and a larger eruption space for the mandibular first permanent molar than the children in Group B. These results indicate that even though there was no significant difference in the anteroposterior dimension of the mandible between the two groups, the internal proportion of the mandible represented as the ratio between the corpus and ramus was significantly different. This may suggest that the different proportional constituents of the mandible have a close relationship with the eruption timing of the mandibular first permanent molar.","PeriodicalId":22311,"journal":{"name":"The Bulletin of Tokyo Medical and Dental University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19445990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on morphology of mandibular corpus and ramus influencing the eruption of mandibular first permanent molar. 下颌骨体支形态对下颌第一恒磨牙出牙影响的研究。

The Bulletin of Tokyo Medical and Dental University Pub Date : 1993-03-01 DOI: 10.11501/3094698

Y. F. Lin

{"title":"Study on morphology of mandibular corpus and ramus influencing the eruption of mandibular first permanent molar.","authors":"Y. F. Lin","doi":"10.11501/3094698","DOIUrl":"https://doi.org/10.11501/3094698","url":null,"abstract":"The mandibular first permanent molar has been reported to be the first permanent tooth to erupt. However, according to the recent reports, a considerable increase in the number of children has been observed with the eruption of the mandibular first permanent molar after the eruption of the mandibular central incisor. The purpose of this study is to investigate whether there is any morphological difference in the mandible including the mandibular corpus and the ramus between the subjects with the mandibular first permanent molar erupting prior to the mandibular central incisor (Group A) and the subjects with the mandibular central incisor erupting prior to the mandibular first permanent molar (Group B). Lateral, posteroanterior, 45-degree oblique cephalometric radiographs and dental plaster models were used as the materials. Based on the data statistically analyzed, the results are summarized as follows: 1. No significant differences were found in the conventional angular lateral cephalometric measurements between the two groups. 2. No significant difference was found in the mandibular length between the two groups. 3. Significant differences were found in the mandibular corpus and the ramus between the two groups. In other words, the children in Group A have a narrower ramus, longer corpus and a larger eruption space for the mandibular first permanent molar than the children in Group B. These results indicate that even though there was no significant difference in the anteroposterior dimension of the mandible between the two groups, the internal proportion of the mandible represented as the ratio between the corpus and ramus was significantly different. This may suggest that the different proportional constituents of the mandible have a close relationship with the eruption timing of the mandibular first permanent molar.","PeriodicalId":22311,"journal":{"name":"The Bulletin of Tokyo Medical and Dental University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86017524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis of immunodominant antigens of Porphyromonas gingivalis 381 in high responder patients. 高应答患者牙龈卟啉单胞菌381免疫优势抗原分析。

The Bulletin of Tokyo Medical and Dental University Pub Date : 1993-03-01

E A Boutsi

{"title":"Analysis of immunodominant antigens of Porphyromonas gingivalis 381 in high responder patients.","authors":"E A Boutsi","doi":"","DOIUrl":"","url":null,"abstract":"The purpose of this study was to determine the immunodominant antigens of P. gingivalis 381 and to examine their composition and molecular weight. Fourteen periodontal patients, with high antibody titers to P. gingivalis 381 sonicated extract, were selected. Whole cell fraction, sonicated extract and outer membrane protein of P. gingivalis 381 were used as antigens in the untreated form as well as in the heated form and treated with papain. Total volume of sugar, protein and lipopolysaccharide (LPS) was estimated in each one of the three antigens. Antibody binding capacity to the three antigens was evaluated, before and after heat and papain treatment, by an enzyme-linked immunosorbent assay (ELISA). In addition, the immunoblotting analysis was performed. The quantitative assays showed that the whole cell fraction contained about ten times more LPS than the other two preparations while the outer membrane protein contained twice the amount of carbohydrates than the other two preparations. The 14 sera were classified into three groups according to the rate of reduction of antibody binding under heat and papain treatment. Concerning heat treatment, most of the sera showed a high reduction of antibody binding when reacting with the sonicated extract. However, antibody binding to the outer membrane protein antigen was hardly decreased by heat treatment in three sera. Also, these three sera showed almost the same response to the whole cell fraction antigen under heat treatment. Under papain treatment, almost all sera showed a moderate reduction of antibody binding when they reacted with the sonicated extract and whole cell fraction while they showed a low reduction of antibody binding when they reacted with the outer membrane protein. From the present study it could be concluded that a main proteinaceous antigen of P. gingivalis was recognized by the majority of the patients suggesting that the proteinaceous portion is an important part of the antigen, while some patients seemed to recognize the LPS or carbohydrate as the antigenic determinant.","PeriodicalId":22311,"journal":{"name":"The Bulletin of Tokyo Medical and Dental University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19369895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of immunodominant antigens of Porphyromonas gingivalis 381 in high responder patients. 高应答患者牙龈卟啉单胞菌381免疫优势抗原分析。

The Bulletin of Tokyo Medical and Dental University Pub Date : 1993-03-01 DOI: 10.11501/3103439

E. Boutsi

{"title":"Analysis of immunodominant antigens of Porphyromonas gingivalis 381 in high responder patients.","authors":"E. Boutsi","doi":"10.11501/3103439","DOIUrl":"https://doi.org/10.11501/3103439","url":null,"abstract":"The purpose of this study was to determine the immunodominant antigens of P. gingivalis 381 and to examine their composition and molecular weight. Fourteen periodontal patients, with high antibody titers to P. gingivalis 381 sonicated extract, were selected. Whole cell fraction, sonicated extract and outer membrane protein of P. gingivalis 381 were used as antigens in the untreated form as well as in the heated form and treated with papain. Total volume of sugar, protein and lipopolysaccharide (LPS) was estimated in each one of the three antigens. Antibody binding capacity to the three antigens was evaluated, before and after heat and papain treatment, by an enzyme-linked immunosorbent assay (ELISA). In addition, the immunoblotting analysis was performed. The quantitative assays showed that the whole cell fraction contained about ten times more LPS than the other two preparations while the outer membrane protein contained twice the amount of carbohydrates than the other two preparations. The 14 sera were classified into three groups according to the rate of reduction of antibody binding under heat and papain treatment. Concerning heat treatment, most of the sera showed a high reduction of antibody binding when reacting with the sonicated extract. However, antibody binding to the outer membrane protein antigen was hardly decreased by heat treatment in three sera. Also, these three sera showed almost the same response to the whole cell fraction antigen under heat treatment. Under papain treatment, almost all sera showed a moderate reduction of antibody binding when they reacted with the sonicated extract and whole cell fraction while they showed a low reduction of antibody binding when they reacted with the outer membrane protein. From the present study it could be concluded that a main proteinaceous antigen of P. gingivalis was recognized by the majority of the patients suggesting that the proteinaceous portion is an important part of the antigen, while some patients seemed to recognize the LPS or carbohydrate as the antigenic determinant.","PeriodicalId":22311,"journal":{"name":"The Bulletin of Tokyo Medical and Dental University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73806680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An ultrastructural study of mitotic chondrocytes in the Swarm rat chondrosarcoma. 蜂群大鼠软骨肉瘤有丝分裂软骨细胞超微结构研究。

The Bulletin of Tokyo Medical and Dental University Pub Date : 1993-03-01

S Shibata, M Niikura, S Suzuki, T Terashima, Y Yamashita, T Ichijo

引用次数: 0

Ultrasonic diagnosis of oral and neck malignant lymphoma. 口腔及颈部恶性淋巴瘤的超声诊断。

The Bulletin of Tokyo Medical and Dental University Pub Date : 1992-12-01

J Ishii, E Fujii, H Suzuki, K Shinozuka, N Kawase, T Amagasa

引用次数: 0

Observations on the structural features and characteristics of biological apatite crystals. 2. Observation on the ultrastructure of human enamel crystals. 生物磷灰石晶体结构特征及特性观察。2. 人牙釉质晶体超微结构的观察。

The Bulletin of Tokyo Medical and Dental University Pub Date : 1992-12-01

T Ichijo, Y Yamashita, T Terashima

{"title":"Observations on the structural features and characteristics of biological apatite crystals. 2. Observation on the ultrastructure of human enamel crystals.","authors":"T Ichijo, Y Yamashita, T Terashima","doi":"","DOIUrl":"","url":null,"abstract":"In a series of studies to investigate the structural features of biological crystals, using an electron microscope, we examined the ultrastructure of human enamel crystals at near atomic resolution through the cross and longitudinal sections of the crystals. The materials used for this study were the middle layer of the noncarious enamel from freshly extracted human erupted permanent molars. The small cubes of the enamel were fixed in glutaraldehyde and osmium tetroxide and embedded in epoxy resin using the routine methods. The ultrathin sections were cut with a diamond knife without decalcification. The sections were examined with HITACHI H-500 and H-700 types of transmission electron microscopes operated at 125-200 kV. Each crystal was observed at the initial magnification of 300,000 times and at the final magnification of 10,000,000 times and over. Using this approach, the authors have been able to show the configuration of the hydroxyapatite in the cross and longitudinal sections of the enamel crystals and observe the basic hexagonal pattern of the unit cell viewed down the c-axis. The authors sincerely believe that the electron micrograph shown in this report is the first atomic image to be obtained from a hydroxyapatite crystal from the human enamel, using the sections.","PeriodicalId":22311,"journal":{"name":"The Bulletin of Tokyo Medical and Dental University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12507638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reliability of Doppler echocardiographic stroke volume measurement. 多普勒超声心动图脑卒中容积测量的可靠性。

The Bulletin of Tokyo Medical and Dental University Pub Date : 1992-09-01

T Yajima, M Nitta, S Nakamura, M Ishimine, H Ito, T Takamoto, M Hiroe, F Marumo

{"title":"Reliability of Doppler echocardiographic stroke volume measurement.","authors":"T Yajima, M Nitta, S Nakamura, M Ishimine, H Ito, T Takamoto, M Hiroe, F Marumo","doi":"","DOIUrl":"","url":null,"abstract":"To evaluate the accuracy and utility of the echocardiographic Doppler method of determining the stroke volume, the stroke volume was measured in 64 instances in 15 patients and compared to the simultaneous thermodilution stroke volume determinations. Stroke volume, varied by atrial pacing at various heart rates, was calculated noninvasively by the product of the cross-sectional area of the aortic orifice determined by echocardiography and the flow velocity integral measured by continuous wave Doppler. While the cardiac output was increased moderately by atrial pacing, the stroke volume was decreased in relation to the increase in the heart rate. The stroke volume calculated by the echo-Doppler method exhibited a significant linear relationship to the stroke volume determined by thermodilution (r = 0.84) and to the cardiac output (r = 0.75, p less than 0.01). Inter-observer and intra-observer variability was 7 +/- 4% and 5 +/- 4%, respectively. The noninvasive echo-Doppler method of estimating the stroke volume is concluded to be accurate, specifically, to be comparable to the values obtained by thermodilution and with a low inter- and intra-observer variability.","PeriodicalId":22311,"journal":{"name":"The Bulletin of Tokyo Medical and Dental University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12690813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0