Pub Date : 1996-12-30DOI: 10.11516/DENTALMEDRES1981.16.377
K. Egawa, N. Nonaka, Takahisa Chiba, Y. Ogura, R. Takiguchi
To examine the three-dimensional arrangement of bone matrix fibrils at their attachment with Sharpey's fibers or muscle tendons, we observed the surface of the body of the mandible, the angle of the mandible, and the coronoid process with a scanning electron microscope. Materials were three male crab-eating macaques (three years old). The fibrous layers of the ectoperiosteum were dissected free. Specimens were incubated in 1% trypsin solution for 72 hours at 37°C to digest both osteoblasts and amorphous organic matrix. At the external and internal surfaces of the body of the mandible, collagen fibril bundles ran horizontally. Spindle-shaped openings were observed between collagen fibril bundles, and we believe that the Sharpey's fibers entered the spindle-shaped openings. At the uneven area of the body of the mandible, collagen fibril bundles crossed each other. Many openings into which tendons of the masseter muscle entered were observed at the external surface of the angle of the mandible. The collagen fibril bundles organizing the surface matrix surrounded the places where the tendons entered. At the external surface of the coronoid process, collagen fibril bundles ran up and down in parallel. Tendons of the temporal muscle entered between collagen fibril bundles.
{"title":"Three Dimensional Arrangement of Matrix Fibrils and Tendon Attachment of Mandible","authors":"K. Egawa, N. Nonaka, Takahisa Chiba, Y. Ogura, R. Takiguchi","doi":"10.11516/DENTALMEDRES1981.16.377","DOIUrl":"https://doi.org/10.11516/DENTALMEDRES1981.16.377","url":null,"abstract":"To examine the three-dimensional arrangement of bone matrix fibrils at their attachment with Sharpey's fibers or muscle tendons, we observed the surface of the body of the mandible, the angle of the mandible, and the coronoid process with a scanning electron microscope. Materials were three male crab-eating macaques (three years old). The fibrous layers of the ectoperiosteum were dissected free. Specimens were incubated in 1% trypsin solution for 72 hours at 37°C to digest both osteoblasts and amorphous organic matrix. At the external and internal surfaces of the body of the mandible, collagen fibril bundles ran horizontally. Spindle-shaped openings were observed between collagen fibril bundles, and we believe that the Sharpey's fibers entered the spindle-shaped openings. At the uneven area of the body of the mandible, collagen fibril bundles crossed each other. Many openings into which tendons of the masseter muscle entered were observed at the external surface of the angle of the mandible. The collagen fibril bundles organizing the surface matrix surrounded the places where the tendons entered. At the external surface of the coronoid process, collagen fibril bundles ran up and down in parallel. Tendons of the temporal muscle entered between collagen fibril bundles.","PeriodicalId":77624,"journal":{"name":"Showa Shigakkai zasshi = The Journal of Showa University Dental Society","volume":"16 1","pages":"377-380"},"PeriodicalIF":0.0,"publicationDate":"1996-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64475004","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}
Pub Date : 1996-12-30DOI: 10.11516/DENTALMEDRES1981.16.337
T. Kodaka, M. Abe, S. Higashi
The inner enamel of human permanent teeth has been reported to be divided into three zones: I, II, and III. In this study, we observed the inner enamel in the lingual side of deciduous incisor teeth with a scanning electron microscope. All transverse ground sections were treated with chromium sulfate. The about 10-,um-thick innermost enamel consisting of prism-like structures was deeply and almost entirely etched. This zone, which was similar to Zone I in permanent teeth, was suggested to contain a smaller amount of organic material and to show a lower calcification. The inner enamel except for the innermost zone may be divided into Zone II and III, because the prisms in the inner enamel adjacent to the innermost zone, about 30 to 40 ,u m in thickness, contained a larger amount of organic material than the outer-side inner enamel. However, the inner enamel can not be divided into two zones, when the outer-side inner enamel showing an arrangement of Pattern 3 prisms is contained in the middle enamel. Abnormal-shaped prisms were observed in the middle enamel as well as in the inner enamel. The lamella-like stalks of enamel tufts, insoluble with chromium sulfate, ran through the prism bodies surrounded by chromium sulfate-insoluble sheaths for a short or a longer distance towards the enamel surface and then ran together with the prism sheath regions. Many of the tuft stalks appeared discontinuously in the prisms, and some of them had fine branches within prisms. Discontinuous structures of the tuft stalks suggest that the lamella shows a fenestrated membrane.
{"title":"Scanning Electron Microscopy of the Inner Enamel in the Lingual Side of Human Deciduous Teeth Followed by Chromium Sulfate Treatment","authors":"T. Kodaka, M. Abe, S. Higashi","doi":"10.11516/DENTALMEDRES1981.16.337","DOIUrl":"https://doi.org/10.11516/DENTALMEDRES1981.16.337","url":null,"abstract":"The inner enamel of human permanent teeth has been reported to be divided into three zones: I, II, and III. In this study, we observed the inner enamel in the lingual side of deciduous incisor teeth with a scanning electron microscope. All transverse ground sections were treated with chromium sulfate. The about 10-,um-thick innermost enamel consisting of prism-like structures was deeply and almost entirely etched. This zone, which was similar to Zone I in permanent teeth, was suggested to contain a smaller amount of organic material and to show a lower calcification. The inner enamel except for the innermost zone may be divided into Zone II and III, because the prisms in the inner enamel adjacent to the innermost zone, about 30 to 40 ,u m in thickness, contained a larger amount of organic material than the outer-side inner enamel. However, the inner enamel can not be divided into two zones, when the outer-side inner enamel showing an arrangement of Pattern 3 prisms is contained in the middle enamel. Abnormal-shaped prisms were observed in the middle enamel as well as in the inner enamel. The lamella-like stalks of enamel tufts, insoluble with chromium sulfate, ran through the prism bodies surrounded by chromium sulfate-insoluble sheaths for a short or a longer distance towards the enamel surface and then ran together with the prism sheath regions. Many of the tuft stalks appeared discontinuously in the prisms, and some of them had fine branches within prisms. Discontinuous structures of the tuft stalks suggest that the lamella shows a fenestrated membrane.","PeriodicalId":77624,"journal":{"name":"Showa Shigakkai zasshi = The Journal of Showa University Dental Society","volume":"69 1","pages":"337-344"},"PeriodicalIF":0.0,"publicationDate":"1996-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64474928","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}
Pub Date : 1996-09-30DOI: 10.11516/DENTALMEDRES1981.16.204
T. Kodaka, M. Abe, S. Higashi
{"title":"Abnormal-Shaped Prisms in the Occlusal Enamel of Human Premolar Teeth","authors":"T. Kodaka, M. Abe, S. Higashi","doi":"10.11516/DENTALMEDRES1981.16.204","DOIUrl":"https://doi.org/10.11516/DENTALMEDRES1981.16.204","url":null,"abstract":"","PeriodicalId":77624,"journal":{"name":"Showa Shigakkai zasshi = The Journal of Showa University Dental Society","volume":"16 1","pages":"204-208"},"PeriodicalIF":0.0,"publicationDate":"1996-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64474880","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}
Pub Date : 1996-06-30DOI: 10.11516/DENTALMEDRES1981.16.159
Mohammad M. R. Khan, A. Funato, Koukichi Matsumoto
{"title":"Morphological Comparative Study on Human Enamel and Dentin Lased by Er : YAG, Nd : YAG and CO2 Lasers","authors":"Mohammad M. R. Khan, A. Funato, Koukichi Matsumoto","doi":"10.11516/DENTALMEDRES1981.16.159","DOIUrl":"https://doi.org/10.11516/DENTALMEDRES1981.16.159","url":null,"abstract":"","PeriodicalId":77624,"journal":{"name":"Showa Shigakkai zasshi = The Journal of Showa University Dental Society","volume":"29 1","pages":"159-163"},"PeriodicalIF":0.0,"publicationDate":"1996-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64474824","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}
Pub Date : 1996-06-30DOI: 10.11516/DENTALMEDRES1981.16.113
T. Kodaka, M. Abe, S. Higashi
The tangentially polished surfaces of the outer enamel under the projections of the marginal ridges and the basal tubercle in the lingual side of maxillary incisor teeth, extracted from elderly periodontic patients, were observed by scanning electron microscopy after EDTA etching. In general, EDTA selectively erodes the prism sheath regions; however, our observations reversed this. It indicates that the prism sheath regions may have been penetrated by organic materials with minerals derived from saliva due to an exposure of the old teeth to the oral cavities for a longer duration since eruption and also the attrition for a longer period. The etched surfaces more or less showed a disordered orientation of enamel prisms. At the junctions of such disorders, there were scattered abnormal-shaped prisms including a spiral, a circle, and double borders. Moreover, the 'inner' prism-like sheaths of the double bordered prisms occasionally showed a circle or a dotted remnant other than an arcade, whereas the circular prisms frequently contained an arcade, a spiral, or a smaller circle in the 'outer' sheaths. These abnormal-shaped prisms are probably formed by the prism orientation disorders following the variable morphological changes of Tomes' processes during the formation of their enamel projections.
{"title":"Abnormal-Shaped Prisms in the Lingual Enamel of Human Permanent Incisor Teeth","authors":"T. Kodaka, M. Abe, S. Higashi","doi":"10.11516/DENTALMEDRES1981.16.113","DOIUrl":"https://doi.org/10.11516/DENTALMEDRES1981.16.113","url":null,"abstract":"The tangentially polished surfaces of the outer enamel under the projections of the marginal ridges and the basal tubercle in the lingual side of maxillary incisor teeth, extracted from elderly periodontic patients, were observed by scanning electron microscopy after EDTA etching. In general, EDTA selectively erodes the prism sheath regions; however, our observations reversed this. It indicates that the prism sheath regions may have been penetrated by organic materials with minerals derived from saliva due to an exposure of the old teeth to the oral cavities for a longer duration since eruption and also the attrition for a longer period. The etched surfaces more or less showed a disordered orientation of enamel prisms. At the junctions of such disorders, there were scattered abnormal-shaped prisms including a spiral, a circle, and double borders. Moreover, the 'inner' prism-like sheaths of the double bordered prisms occasionally showed a circle or a dotted remnant other than an arcade, whereas the circular prisms frequently contained an arcade, a spiral, or a smaller circle in the 'outer' sheaths. These abnormal-shaped prisms are probably formed by the prism orientation disorders following the variable morphological changes of Tomes' processes during the formation of their enamel projections.","PeriodicalId":77624,"journal":{"name":"Showa Shigakkai zasshi = The Journal of Showa University Dental Society","volume":"16 1","pages":"113-118"},"PeriodicalIF":0.0,"publicationDate":"1996-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64474769","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}
Pub Date : 1996-03-31DOI: 10.11516/DENTALMEDRES1981.16.1
T. Kodaka, M. Abe, S. Higashi
{"title":"Alternative Appearance of Spiral Prisms in the Gnarled Enamel of Human Teeth","authors":"T. Kodaka, M. Abe, S. Higashi","doi":"10.11516/DENTALMEDRES1981.16.1","DOIUrl":"https://doi.org/10.11516/DENTALMEDRES1981.16.1","url":null,"abstract":"","PeriodicalId":77624,"journal":{"name":"Showa Shigakkai zasshi = The Journal of Showa University Dental Society","volume":"16 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"1996-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.11516/DENTALMEDRES1981.16.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64474692","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}
Pub Date : 1995-12-31DOI: 10.11516/DENTALMEDRES1981.15.297
T. Kodaka, S. Higashi
Usually, Tomes' process pits on the intact enamel surfaces show a circular or a cross-sectioned prism-shaped outline. In this scanning electron microscopic study, we found that smaller Tomes' process pits showed various irregular outlines including incompletely closed pits on the supracervical enamel surface in a premolar tooth. The crystal density in these pit margins was lower than that of the surrounding enamel. These results suggest that the final matrix deposition by ameloblasts occasionally continues for a short time after the formation of Tomes' process pits which have shown a usual outline. Such a formation differs from the formation of a small dome-shaped projection within the pit.
{"title":"Incompletely Closed Tomes' Process Pits on the Enamel Surface along the Perikymata","authors":"T. Kodaka, S. Higashi","doi":"10.11516/DENTALMEDRES1981.15.297","DOIUrl":"https://doi.org/10.11516/DENTALMEDRES1981.15.297","url":null,"abstract":"Usually, Tomes' process pits on the intact enamel surfaces show a circular or a cross-sectioned prism-shaped outline. In this scanning electron microscopic study, we found that smaller Tomes' process pits showed various irregular outlines including incompletely closed pits on the supracervical enamel surface in a premolar tooth. The crystal density in these pit margins was lower than that of the surrounding enamel. These results suggest that the final matrix deposition by ameloblasts occasionally continues for a short time after the formation of Tomes' process pits which have shown a usual outline. Such a formation differs from the formation of a small dome-shaped projection within the pit.","PeriodicalId":77624,"journal":{"name":"Showa Shigakkai zasshi = The Journal of Showa University Dental Society","volume":"15 1","pages":"297-299"},"PeriodicalIF":0.0,"publicationDate":"1995-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64474901","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}
Pub Date : 1995-12-31DOI: 10.11516/DENTALMEDRES1981.15.303
Masako Nakamura
{"title":"Changes in the Expression of Transforming Growth Factor-α and Lewis^y Antigen with the Malignant Transformation of Oral Leukoplakia into Squamous Cell Carcinoma","authors":"Masako Nakamura","doi":"10.11516/DENTALMEDRES1981.15.303","DOIUrl":"https://doi.org/10.11516/DENTALMEDRES1981.15.303","url":null,"abstract":"","PeriodicalId":77624,"journal":{"name":"Showa Shigakkai zasshi = The Journal of Showa University Dental Society","volume":"15 1","pages":"303-310"},"PeriodicalIF":0.0,"publicationDate":"1995-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64474963","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}
Pub Date : 1995-12-31DOI: 10.11516/DENTALMEDRES1981.15.311
A. Shinya, J. Ohsawa, N. Kobayashi, K. Warita, R. Furuya, T. Kawawa
{"title":"A Comparative Study on the Marginal Discrepancies of Full Cast Crowns","authors":"A. Shinya, J. Ohsawa, N. Kobayashi, K. Warita, R. Furuya, T. Kawawa","doi":"10.11516/DENTALMEDRES1981.15.311","DOIUrl":"https://doi.org/10.11516/DENTALMEDRES1981.15.311","url":null,"abstract":"","PeriodicalId":77624,"journal":{"name":"Showa Shigakkai zasshi = The Journal of Showa University Dental Society","volume":"15 1","pages":"311-314"},"PeriodicalIF":0.0,"publicationDate":"1995-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64474976","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}
Pub Date : 1995-12-31DOI: 10.11516/DENTALMEDRES1981.15.300
T. Kodaka, S. Higashi
{"title":"Fine Incremental Lines Observed on the Surface-Overlapping Projections of Human Enamel after EDTA Etching","authors":"T. Kodaka, S. Higashi","doi":"10.11516/DENTALMEDRES1981.15.300","DOIUrl":"https://doi.org/10.11516/DENTALMEDRES1981.15.300","url":null,"abstract":"","PeriodicalId":77624,"journal":{"name":"Showa Shigakkai zasshi = The Journal of Showa University Dental Society","volume":"15 1","pages":"300-302"},"PeriodicalIF":0.0,"publicationDate":"1995-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64474950","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}
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