Tsurumi shigaku. Tsurumi University dental journal最新文献

{"title":"[Immunohistochemical study in pleomorphic adenomas of human parotid gland--with special reference to cytoskeletal filamentous proteins].","authors":"A Matsumori","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The purpose of this immunohistochemical study was to know the degree and direction of differentiation, the mechanism of mesenchymal appearance, and histogenesis in pleomorphic adenomas which were obtained from surgical removed specimens. All specimens were fixed in 10% neutral phosphoate buffered formalin, and embedded in paraffin. Sections were steined with the avidin-biotin peroxidase complex method for keratin, vimentin, desmin and S-100 protein, the peroxidase-antiperoxidase method for lysozyme, and the direct immunoperoxidase method for IgA and secretory component. Normal salivary glands were employed as controls. 1. Solid portion of pleomorphic adenomas were consisted of the focal hypline cells and scattered the duct cell-like cells. The hyaline cells were positive for vimentin and S-100 protein, and the duct cell-like cells were positive for keratin. But one case was found the bundles of spindle-shaped cells which was similar to myoepithelial cells were positive for actin and another case was consisted of the focal duct cell-like cells were observed. 2. In the tubular portion, the duct-like structures were classified into three types. One type was mono-layered structure, another type was double-layered structure and the other type is duct-like structure in the solid portion. Any inner layer of the duct-like structure were positive for keratin. 3. Double-layered duct-like structures were most common type. Among the double-layered structures, hyaline cells mostly made up the outer layered structures. At times, the spindleshaped cells of the outer layer were found. This structures were similar to intercalated portion of normal salivary glands. In one case, inner and outer layer was consisted of keratin positive cells, but outer layer was steined for keratin stronger than inner. This structure was similar to excretory duct of normal salivary glands. 4. IgA and sc were seen at inner cells and in luminal accumulation of the duct-like structures. 5. In the myxoid regions, stellate cells or spindle cells were positive for vimentin, S-100 protein and partial positive for desmin. In the chondroid regions, chondrocyte-like cells were positive for vimentin and S-100 protein. These results seemed to suggest that pleomorphic adenomas were composed of duct cell-like cells and hyaline cells. Duct cell-like cells consisted of the duct-like structure in order to transport secretion which was similar to the duct of normal salivary glands.(ABSTRACT TRUNCATED AT 250 WORDS)</p>","PeriodicalId":76770,"journal":{"name":"Tsurumi shigaku. Tsurumi University dental journal","volume":"15 3","pages":"443-60"},"PeriodicalIF":0.0,"publicationDate":"1989-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13629698","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}

{"title":"[Study on composite resin cores. Part 2. Effect of pressing composite resin].","authors":"Y Nagano,&nbsp;S Miyamoto,&nbsp;Y Kokubo,&nbsp;T Kamiyama,&nbsp;S Noghuchi,&nbsp;N Hanamura","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In this study, we investigated effects of pressing in building composite resin cores on compressive strength, retention of prefabricated post and sealing ability. 1. Compressive strength increased by pressing in composite resin cores. 2. Prefabricated post to the retentive forces was not influenced by pressing, but increased when bonding agent was used. 3. Pressing was very effective to improve sealing ability of composite resin to tooth structure. 4. Sealing ability of light-cured composite resin was not influenced by pressing but by curing types of bonding agent.</p>","PeriodicalId":76770,"journal":{"name":"Tsurumi shigaku. Tsurumi University dental journal","volume":"15 3","pages":"433-42"},"PeriodicalIF":0.0,"publicationDate":"1989-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13631758","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}

{"title":"[Restoration of four missing upper-incisors with fixed bridges. I. A survey of fifty fixed bridges].","authors":"S Mukai","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Four missing upper-incisors are usually restored in practice by both ways, fixed bridges and removable partial dentures. A survey of fifty fixed bridges for this type of missing teeth was conducted, in order to find out some points of caution when bridges are selected. The following results were obtained: 1. The average age of patients was 47 years old and the average life span of bridges was about 10 years. 2. Six-tooth fixed bridges extending from cuspid to cuspid, that is, bridges with two abutment teeth made up 70% of all bridges. 3. Band-crowns were used in the highest frequency (50%) retainers. 4. Various kinds of disorders were detected in the gathered bridges. Particularly recurrent caries and alveolar bone loss around the abutment teeth were remarkable. 5. Three-quarter crowns became uncemented in high frequency and therefore seemed to provide inadequate retention. 6. Regarding the contact of pontic with the ridge tissue, the effect of the material used was predominant to the form. 7. The upper incisors of pontic could play the role of guidance during protrusive movements with very little occurrences of disorder. 8. The occlusal support index of under 8 indicated a high possibility of various disorders afterwards.</p>","PeriodicalId":76770,"journal":{"name":"Tsurumi shigaku. Tsurumi University dental journal","volume":"15 3","pages":"461-76"},"PeriodicalIF":0.0,"publicationDate":"1989-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13631759","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}

{"title":"[Effect of soft laser on pain].","authors":"S Aoyama,&nbsp;K Tange,&nbsp;F Kobayashi,&nbsp;N Hanamura","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Two kinds of semiconductor laser, STOMA-LASER and Four-Luck, were used for patients having pain in the mouth and their effective rates were compared in 93 patients (133 cases). As a result, the following results were obtained. 1. The effective rate was 70.7% at the stage just after radiation. 2. Age, sex and oral hygiene were not significant for the effective rate. 3. The kinds of diseases were remarkably significant. 4. The kind of apparatus did not play any role in the effective rate as a whole, but was significant for the kinds of disease.</p>","PeriodicalId":76770,"journal":{"name":"Tsurumi shigaku. Tsurumi University dental journal","volume":"15 3","pages":"529-37"},"PeriodicalIF":0.0,"publicationDate":"1989-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13633860","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}

{"title":"[Case of sialolithiasis with severe fatty change of the submandibular salivary gland].","authors":"R Hiramoto,&nbsp;K Ishibashi,&nbsp;K Asada,&nbsp;Y Nakagawa,&nbsp;S Yamachika,&nbsp;M Jibiki,&nbsp;Y Naruse,&nbsp;T Adachi,&nbsp;S Tochihara","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>We encountered a 57-year-old female with sialolithiasis associated with severe fatty change in the submandibular salivary gland. The submandibular salivary gland was removed under general anesthesia, and the postoperative course was uneventful. Histopathological changes observed in submandibular salivary glands with sialoliths are mainly inflammatory cell infiltration or connective tissue infiltration. On the other hand, increase in fat cells with age has been reported, but these age-related fatty changes are not severe. It was considered that the cause of the fatty change in this case was related to anoxia, which increased with long-term stasis of the duct system that was brought on by the development of the sialolith.</p>","PeriodicalId":76770,"journal":{"name":"Tsurumi shigaku. Tsurumi University dental journal","volume":"15 3","pages":"427-31"},"PeriodicalIF":0.0,"publicationDate":"1989-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13631757","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}

{"title":"[Solvent power of new denture cleaner for denture calculus and the influence of this cleaner on the denture materials].","authors":"C Ishikawa,&nbsp;T Hosoi,&nbsp;M Morito,&nbsp;E Miwa,&nbsp;F Tsuchida,&nbsp;M Ohtsuki,&nbsp;I Hirono,&nbsp;O Sawada","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In order to chemically remove the calculus adhering to a denture, new denture cleaner was prepared on an experimental basis. The principal ingredient of this solution was a chilating agent which contained the phosphoric acid. This study consisted of the fundamental and the clinical examinations of this solution the purpose of which was to test the solvent power of this solution on the calculus and to evaluate its influence on the denture materials and its effectiveness in clinical practice. 1. the fundamental study 1) method (1) The test for the solvent power of this solution. The powder of tricalcium phosphate (T.C.P. powder: Wakohjunyaku Co.) was substituted for the calculus adhering to a denture. (1) The influence of the solution temperature on the solvent power. The T.C.P. powder was dissolved at 20 degrees C, 30 degrees C, 40 degrees C, 50 degrees C and 60 degrees C temperature in 10 g of the solution within 10 minutes and the amount of dissolved powder was weighted. The time was measured with a stop watch (Seiko Co.) until 0.5 g of T.C.P. powder had been dissolved in 10 g of the solution. (2) The effect of using it with an ultrasonic cleaner. The time to dissolve 0.1 g of T.C.P. powder in 10 g of this solution was compared with that of the 15% EDTA solution. The measurement was repeated 5 times and the arithmetic mean of the 5 sample values was calculated in order to show the experimental results. The room temperature was 19 +/- 2 degrees C, the humidity was 56 +/- 3%. (2) The influence of this solution on the denture materials. (1) resin specimen. In order to test the transverse strength, transverse deflection, Young's modulus and Knoop hardness, resin specimens were processed in the manner specified in I.S.O. 1567. The data were compared the resin specimens steeped in this solution and with the control sample that was steeped in water. The specimens were immersed up to 24 hours. Furthermore the existence of tarnish was observed with a 40 times microscope. (2) metal specimen. In order to test the corrosion, metal specimens were produced according to the manner of a corrosion test. The metal specimens were held vertically and the end immersed to 20 mm in this solution for 24 hours and 120 hours each. After steeping, each specimen was measured for loss in weight. The data were calculated as the loss in weight per hour (mg/cm) and the depth of corrosion per year (mm/yr).(ABSTRACT TRUNCATED AT 400 WORDS)</p>","PeriodicalId":76770,"journal":{"name":"Tsurumi shigaku. Tsurumi University dental journal","volume":"15 3","pages":"515-27"},"PeriodicalIF":0.0,"publicationDate":"1989-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13631762","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}

{"title":"[Restoration of four missing upper-incisors with fixed bridges. II. Fabrication of fourteen fixed bridges].","authors":"S Mukai","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In the previous study, fifty fixed bridges with four missing upper-incisors were gathered and analysed. As a result, several points of caution for restoring this type of missing teeth were obtained. In this study, the relationship of b/a ratio and marginal leakage was first investigated as a preliminary study and then fourteen fixed bridges were newly made upon these results. In addition, a follow-up study within 3.5 years was conducted. 1. Marginal leakage was closely correlative to marginal fit of crowns, that is, marginal leakage occurred at the portion of the crown margin having the thick layer of cement, and expanded to the lingual and/or distal side. 2. As b/a ratio became smaller, marginal leakage increased and especially expanded in the incisal direction. 3. Ceramometal crowns were estimated to be strong enough as retainers for restoring four missing incisors. 4. Ni-Cr alloy cast as one-piece manifested frictional fit just as with a precious alloy. 5. In the follow-up study, fracture of porcelain facing and excessive wear of occluding natural teeth were detected in one case each and gingival retraction or swelling of gingiva were perceived in three cases.</p>","PeriodicalId":76770,"journal":{"name":"Tsurumi shigaku. Tsurumi University dental journal","volume":"15 3","pages":"477-86"},"PeriodicalIF":0.0,"publicationDate":"1989-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13631760","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}

{"title":"[Mineralization patterns in the dentine of the floor of the pulp chamber of porcine molars].","authors":"H Sawamura","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The relationship between the arrangement of the matrix fibre bundles and the shape of the mineralization front (mineralization pattern) were observed in the dentine of the subpulpal wall of porcine molars. The observations were made using mainly light microscopy and scanning electron microscopy on the primary dentine excluding the secondary dentine. The results obtained shows that the dentine of the subpulpal wall consists of two parts, a surface layer and the circumpulpal dentine. The surface layer can be divided into two sublayers according to the arrangement of it's matrix fibres. The mineralization pattern was also observed to have another two sublayers which did not correspond with the two fibrous subdivisions. Adjacent to the dentine-cement junction, there is a layer, measuring about 3 microns in thickness, in which the matrix fibres run parallel to the junction. The second layer is characterized by two types of fibre bundles which run perpendicularly to the dentine-cement junction. These outer radially oriented fibres are about 1-2 microns in diameter, and the inner radially oriented fibre bundles are coarse, 10 microns in diameter. In the outermost 10 microns, mineralization begins as an aggregation of mineral granules, and forms a hypermineralized layer which overlays the junctional region between the fibres which are oriented parallel and perpendicular to the dentine-cement junction. Except for the most-superficial layer, mineralizing cones surround the radial fibre bundles at the mineralizing front. The circumpulpal dentine, which forms the floor of the pulp chamber, can also be divided into two layers by the differences in their fibrous matrix. The fibres of both of these layers lay in the plane of the predentine surface. However, in the outer layer the fibres of the matrix are randomly arranged around and between the dentinal tubules, whereas in the inner layer the fibres have a preferred orientation extending radially from a central region between the roots. In the outer layer, calcospherites, which are the units of the mineral aggregation, appear at the mineralizing front. In the inner layer, at the mineralizing front, ridges, measuring approximately 10-15 microns in width, 10 microns in height and 100 microns in length, also have a preferred orientation, 90 degrees to the fibre direction. Microradiographs show that a higher mineralized \"lamellae-like' region exists in the center of each ridge-crest. X-ray diffraction indicates two preferred crystallite orientation, one is parallel to the matrix fibres and the other perpendicular to the predentine surface. The latter seems to be situated in the highly mineralized lamellae. In the circumpulpal dentine, therefore the mineralizing units have a spheritic shape in the outer layer, and a columner shape in the inner layer. As far as the author is aware the columnar mineralization unit in mammalian dentine has not been described before.</p>","PeriodicalId":76770,"journal":{"name":"Tsurumi shigaku. Tsurumi University dental journal","volume":"15 3","pages":"487-513"},"PeriodicalIF":0.0,"publicationDate":"1989-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13631761","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}

{"title":"[Surface accuracy of hydrophilic impressions. 1].","authors":"L Bai,&nbsp;M Mizuno","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The purpose of this study was to examine detail reproducibility and surface roughness of stone models made from silicone, polysulfied rubber, alginate and agar impression materials using stainless steel test block (ISO). In addition, the influence of artificial saliva was studied. The following results were obtained: 1. Silicone impression materials showed the best detail reproducibility of all materials. 2. When artificial saliva was dropped on the stainless steel test block, hydrophilic silicone impression material showed the best detail reproducibility. 3. In the test using artificial saliva, alginate and agar impression materials showed better surface roughness, but poorer detail reproducibility than silicone impression ones. 4. Hydrophilic silicone material indicated the highest detail reproducibility, and the lowest surface roughness in the test using artificial saliva.</p>","PeriodicalId":76770,"journal":{"name":"Tsurumi shigaku. Tsurumi University dental journal","volume":"15 2","pages":"343-8"},"PeriodicalIF":0.0,"publicationDate":"1989-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13782694","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}

{"title":"[Experimental studies on properties of mouth protector: evaluation of various materials dynamic energy absorption test with electrical shock sensor].","authors":"T Yamamoto","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>During contact sports, mouth protectors are very effective in protecting teeth from traumatic forces, which are usually great enough to fracture teeth or at least to damage their supporting structures. In addition, they reduce the force transmitted through the temporomandibular joint to the base of the skull. Athletes select mouth protectors from various view points, that is, energy absorption, comfortable seating, retention, durability, speech facility, lack of taste, and cleanliness. In this study, the physical properties of various highly polymerized compound materials were investigated in an attempt to select a suitable material for use as a mouth protector and to develop a new relevant mechanical test. Dynamic energy absorption tests were performed by positioning a specimen on the board and allowing a 12.7 mm diameter steel ball to fall from a predetermined height and measuring by electrical shock sensor. The following results were obtained: 1. Materials such as Rabaron S 371 C, Exaflex, Flexicon and Sorbosene (soft type), indicated highest value of energy absorption rate. 2. As the thickness of inner materials increased the energy absorption rate also increased and the logarithmic decrement decreased.</p>","PeriodicalId":76770,"journal":{"name":"Tsurumi shigaku. Tsurumi University dental journal","volume":"15 2","pages":"335-42"},"PeriodicalIF":0.0,"publicationDate":"1989-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13782693","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}