Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials最新文献

[Studies on new superelastic NiTi orthodontic wire. (Part 1) Tensile and bend test (author's transl)]. 新型超弹性镍钛正畸丝的研究。(第1部分)拉伸和弯曲试验[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1982-01-01

K Watanabe

{"title":"[Studies on new superelastic NiTi orthodontic wire. (Part 1) Tensile and bend test (author's transl)].","authors":"K Watanabe","doi":"","DOIUrl":"","url":null,"abstract":"NiTi alloy has attracted the most public interest in recent years. This alloy has two unique properties, one is \"shape memory effect\" and the other is \"outstanding elasticity\". NiTi wire with the property of outstanding elasticity suggested it could be useful in orthodontics. Recently new NiTi alloy which had other characteristics of \"superelasticity\" was developed. In this study, new superelastic NiTi wire was examined to evaluate for use in orthodontics, in tensile and bend tests, compared with stainless steel, Co-Cr alloy and work hardened NiTi wire. The results obtained are as follows: (1) New superelastic NiTi wire showed unique stress-strain curve with a plateau from the strain of 2% to 5%, the unique deformation behavior was caused by stress induced transformation, and returned to almost zero strain as stress was reduced. (2) New superelastic NiTi wire showed an elongation of about 11%. In the cyclic tensile tests to the strain of 8%, new superelastic NiTi wire showed little permanent deformation of 0.5% after 10 cycles. (3) In bend tests, new superelastic NiTi wire showed lower than half load compared with stainless steel and Co-Cr alloy wires. Its permanent deformation was very little after 2 mm deflection. (4) The load-deflection curve of new superelastic NiTi wire showed almost constant load in the wide range of deflection. The results of this study indicate that new superelastic NiTi wire must be considered as a promising candidate for orthodontic arch wire.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"23 61","pages":"47-57"},"PeriodicalIF":0.0,"publicationDate":"1982-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18002249","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

[Studies on sintering of dental porcelain. (Part 2) Binary system sintering of quartz and low fusing frit (author's transl)]. 牙用瓷的烧结研究。(第二部分)石英和低熔块的二元烧结[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1982-01-01

N Kuwayama, M Kon

引用次数: 0

[A fundamental study of the fabrication of a medical prosthesis by slip casting (author's transl)]. [滑移铸造制造医用假体的基础研究[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1982-01-01

S Ohkawa

{"title":"[A fundamental study of the fabrication of a medical prosthesis by slip casting (author's transl)].","authors":"S Ohkawa","doi":"","DOIUrl":"","url":null,"abstract":"Sintered 316 L stainless steel, made by slip casting, was studied in the present work for its potential use as a medical prosthesis. The physical and mechanical properties were scrutinized to determine characteristics of the specimens. Corrosion tests were conducted in boiling 5% H2SO4. Microstructures of the specimens were examined. The samples were implanted for 31 days in the dorsolateral subcutaneous site of living rats. The results were as follows. The shrinkage during heating varied from 10.3 to 33.0%, the relative density from 0.41 to 0.78, and porosity from 20.4 to 58.2%. Tensile strength varied from 2.3 to 24.6 kg/mm2, yield strength from 2.8 to 11.6 kg/mm2, elastic modulus from 1 075 to 7 400 kg/mm2, elongation from 9.1 to 19%, hardness of Brinell scale from 7.5 to 53.1. Mechanical properties as mentioned above decreased with increasing porosity. Pore size distribution varied 4.4 to 44 mu. Both Si and ferrite, or either of the two were observed in the matrix of austenite. Corrosion resistance were effected greatly by the porosity. Blood vessels, fibroblasts, fibrous tissues were found surrounding the sintered specimens and in the interior pores. No degeneration or necrosis were noted. Based on the tentative findings of the present studies, I can say that sintered stainless steel have a potential for medical application.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"23 61","pages":"116-34"},"PeriodicalIF":0.0,"publicationDate":"1982-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18002248","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

[Adhesion of polysulfide rubber impression material to dental metals (author's transl)]. [聚硫橡胶印模材料与牙科金属的附着力[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1982-01-01

T Kawai, T Iwata, K Nishimoto, Y Aida, Y Aoki, M Yamauchi, J Hasegawa

{"title":"[Adhesion of polysulfide rubber impression material to dental metals (author's transl)].","authors":"T Kawai, T Iwata, K Nishimoto, Y Aida, Y Aoki, M Yamauchi, J Hasegawa","doi":"","DOIUrl":"","url":null,"abstract":"In order to investigate the adhesiveness of polysulfide rubber impression material to dental metals, we performed the tension test on the sample specimens which had been prepared by injecting the impression material into the gap between opposite metal surfaces finished brightly, thereafter observed the fractured surfaces. Pure metals decreased their adhesive strength to the impression material in order of Au, Pd greater than Ag greater than Cu. Some noble metal alloys containing gold and palladium in a large amount showed the good adhesiveness. In clinical using of 14 carat gold and gold-palladium-silver alloys for core metal, it should be noticed that polysulfide rubber adheres tightly to these alloys. Adhesive strength of copper was not so great comparing with noble metals, therefore the surface of copper tray should be roughned by emery paper above #500, aiming the mechanical bonding forth to increase. The surface of many metals which had left in regulated atmosphere for many hours showed the tendency to decrease their adhesiveness to the impression material. This tendency was not recognized on the metals which had appeared the failure of adhesion bond on the bright finished surfaces.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"23 61","pages":"40-6"},"PeriodicalIF":0.0,"publicationDate":"1982-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18090349","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

[The cushion ability of lining materials for the setting and heating expansion of plaster bonded investment in casting ring. Part I: For casting mold cavity of inlay type (author's transl)]. 衬里材料对石膏粘接熔模铸造环的凝固和加热膨胀的缓冲能力。第一部分:用于铸造镶嵌型模腔[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1982-01-01

T Nasu, H Noguchi

{"title":"[The cushion ability of lining materials for the setting and heating expansion of plaster bonded investment in casting ring. Part I: For casting mold cavity of inlay type (author's transl)].","authors":"T Nasu, H Noguchi","doi":"","DOIUrl":"","url":null,"abstract":"We measured the dimensional change of mold cavity in casting ring and casting accuracy for inlay type casting using two kinds of lining materials in various conditions. These lining materials were asbestos ribbon and ceramic fiber. In the comparison of cushion ability for the expansion of investment in casting ring of these two lining materials, following results were obtained. 1. Compressibility of ceramic fiber was twice as much as asbestos. And, two sheets of ceramic fiber ribbons had enough ability for free expansion of investment in casting ring. 2. More than two sheets of asbestos ribbons in dry state had the ability of compensation for casting shrinkage in heating process. 3. Asbestos ribbon in wet state made a setting expansion of investment larger, but had not any ability of cushion for heating expansion of investment. 4. If the cushion ability of lining materials was not enough, the mold cavity shrank. The order of this shrinking inclination were no lining material state, two sheets, one sheet of wet asbestos, and one sheet of dry asbestos. 5. This shrinking inclination of smaller cavity was greater than that of larger cavity. That meant that the larger thickness of investment in ring made this shrinking inclination greater. 6. In case of without mold cavity, the heating expansion of the investment toward the casting ring were same value at any position in casting ring.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"23 61","pages":"65-75"},"PeriodicalIF":0.0,"publicationDate":"1982-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18090351","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

[Thermal behavior of phosphate-bonded investment. Part 1. Thermal behavior of MgNH4PO4.6H2O (author's transl)]. 磷酸盐键合投资的热行为。第1部分。MgNH4PO4.6H2O的热行为[作者译]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1982-01-01

H Higuchi, S Matsuya, M Yamane

{"title":"[Thermal behavior of phosphate-bonded investment. Part 1. Thermal behavior of MgNH4PO4.6H2O (author's transl)].","authors":"H Higuchi, S Matsuya, M Yamane","doi":"","DOIUrl":"","url":null,"abstract":"Thermal behavior of MgNH4PO4.6H2O was investigated by means of TG-DTA and X-ray diffraction. Two endothermic peaks (90 degrees C and 230 degrees C) and a exothermic peak (660 degrees C) were observed in a micro-DTA curve. Weight loss occurred at two stages corresponding to the two endothermic peaks. Values of weight loss were about 38% and 53%, respectively, at the end of each stage. These values were nearly equal to theoretical weight losses in the formation of Mg2P2O7 from MgNH4PO4.6H2O via MgNH4PO4.H2O. The intermediate, MgNH4PO4.H2O was identified by X-ray diffraction. The second weight loss continued till about 600 degrees C. The product during the second stage was amorphous and Mg2P2O7 began to crystallize above about 600 degrees C. The exothermic peak was thought to correspond to the crystallization. On the other hand, the first endothermic peak separated into two peaks in a macro-DTA curve. The first corresponded to removal of crystal water from MgNH4PO4.6H2O and the second to evaporation of the condensed water. Moreover the exothermic peak also separated into two peaks and the peak temperatures lowered. It was considered that the crystallization was affected by the atmosphere.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"23 61","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"1982-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18002246","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

Microstructure change and segregation distribution in dental 32 Ni-23 Cu-25 Mn casting alloy. (Part 1) Effect of air-vent system. 牙科32ni - 23cu - 25mn铸造合金组织变化及偏析分布(1)通风系统的效果。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1982-01-01

K Wakasa, M Yamaki

引用次数: 0

[Studies on dental self-curing resins (22) - adhesion of 4-META/MMA-TBB resin to enamel (author's transl)]. [牙齿自固化树脂的研究(22)- 4-META/MMA-TBB树脂与牙釉质的粘附性[作者译]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1982-01-01

N Nakabayashi, M Takeyama, K Kojima, M Mogi, F Miura, E Masuhara

引用次数: 0

[Thermal behavior of phosphate-bonded investment. Part 2. Reactions in the systems of MgO-MgNH4PO4.6H2O and MgO-NH4H2PO4 (author's transl)]. 磷酸盐键合投资的热行为。第2部分。MgO-MgNH4PO4.6H2O和MgO-NH4H2PO4体系中的反应[作者译]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1982-01-01

H Higuchi, S Matsuya, M Yamane

{"title":"[Thermal behavior of phosphate-bonded investment. Part 2. Reactions in the systems of MgO-MgNH4PO4.6H2O and MgO-NH4H2PO4 (author's transl)].","authors":"H Higuchi, S Matsuya, M Yamane","doi":"","DOIUrl":"","url":null,"abstract":"Reaction process in the equimolar mixtures of MgO-MgNH4PO4.6H2O and MgO-NH4H2PO4 were investigated by TG-DTA and X-ray diffraction. In the MgO-MgNH4PO4.6H2O system, MgNH4PO4.6H2O was changed by heating in the following way. The formation of MgNH4PO4.H2O by dehydration about 100 degrees C and of amorphous Mg2P2O7 by dehydration and removal of NH3 above 200 degrees C and the crystallization of Mg2P2O7 above 600 degrees C. A part of the amorphous Mg2P2O7 reacted with MgO to form Mg3(PO4)2 above 600 degrees C. The crystallized Mg2P2O7 also reacted with MgO to form Mg3(PO4)2 at higher temperature. In the MgO-NH4H2PO4 system, MgNH4PO4.H2O was formed by the reaction between them, which was corresponded to an exothermic peak about 140 degrees C in the DTA curve. MgNH4PO4.H2O, an unknown phase Y and an amorphous phase were formed at 200 degrees C. The crystalline phases almost disappeared and another unknown phase X appeared at 300 degrees C. The phase X also disappeared and Mg(PO3)2 appeared at 400 degrees C. In the TG-DTA curve for this system, an exothermic peak, which was corresponded to crystallization of Mg(PO3)2, was observed about 550 degrees C and the decomposition of NH4H2PO4 ceased after the crystallization. Mg(PO3)2 reacted with MgO to form Mg2P2O7 at higher temperature.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"23 61","pages":"6-11"},"PeriodicalIF":0.0,"publicationDate":"1982-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17999627","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

[Studies on dental self-curing resins (20) - adhesion mechanism of 4-META/MMA-TBB resin to dentine (author's transl)]. [口腔自固化树脂的研究(20)- 4-META/MMA-TBB树脂与牙本质的粘附机理[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1982-01-01

N Nakabayashi, M Takeyama, K Kojima, E Masuhara

引用次数: 0