Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials最新文献_第8页

[Age--hardening in Au-8wt%Pd alloys containing small quantities of indium (part 1) (author's transl)]. [含少量铟的Au-8wt%Pd合金的时效硬化(第1部分)[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1980-07-01

H Sasaki, H Honma, M Kawakami

{"title":"[Age--hardening in Au-8wt%Pd alloys containing small quantities of indium (part 1) (author's transl)].","authors":"H Sasaki, H Honma, M Kawakami","doi":"","DOIUrl":"","url":null,"abstract":"Age-hardening was produced by the additions of minor amounts of indium to a Au-Pd-base alloy for metal-ceramics, as in the Au-Pt-based ternary alloys. (1) The age-hardening, detected from the electrical resistance measurement and hardness test, increased with increasing indium contents in the Au-Pd-In ternary alloys, but was not responsible in a Au-Pd-base alloy. (2) Photomicrographs of the ternary alloys demonstrated the characteristic microstructures in the age-hardened state, but did not appear the intragranular precipitations in the as-casted and the solution-annealed state. A nodular reaction at the grain boundary was shown in the initial aging stage, subsequently the precipitations in the matrix resulted with increasing in hardness. The typical Widmannstätten's structure was developed with the over-aged stage. (3) The matrix phase in the Au-Pd-base ternary alloys containing indium was indexed by X-ray diffraction to a face-centered cubic structure. The lattice parameters were found within a=4.05 A to a=4.06 A, and then increased with indium contents. (4) The cause of the age-hardening has been implied during to the formation of intermetallic compounds, i.e. Pd-In system, but the structures can not been identified in the age-hardening state.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 55","pages":"201-8"},"PeriodicalIF":0.0,"publicationDate":"1980-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17985569","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

[ADA Specification No. 4. Revision of dental inlay casting waxes]. [ADA规范第4号]牙嵌体铸造蜡的改良[j]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1980-07-01

S Takahashi

引用次数: 0

Testing of color stability of composites. 复合材料颜色稳定性试验。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1980-07-01

Y Miyagawa, J B Dennison, J M Powers

引用次数: 0

[Mixing time of zinc phosphate cement (author's transl)]. [磷酸锌水泥搅拌时间(作者简介)]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1980-07-01

M Takeuchi, Y Shiozawa, K Shimizu, T Watanabe, J Hasegawa

引用次数: 0

[Study on the setting reaction of the zinc phosphate dental cement (2). The setting reaction of cement substituted magnesia clinker for zinc oxide (author's transl)]. [磷酸锌牙水泥固化反应的研究(2).水泥用氧化锌取代氧化镁熟料的固化反应(作者译)]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1980-07-01

K Jyoshin

引用次数: 0

The possibility of dental applications on pressure measuring sheet. 牙科压力测量片应用的可能性。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1980-07-01

S Hirano, T Hirasawa, N Hanamura, S Fukushima, T Toyohara, N Kohyama

引用次数: 0

[The effects of high copper amalgams upon L strain fibroblasts in vitro (author's transl)]. [高铜汞合金对L株体外成纤维细胞的影响[作者译]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1980-04-01

S Isomura

{"title":"[The effects of high copper amalgams upon L strain fibroblasts in vitro (author's transl)].","authors":"S Isomura","doi":"","DOIUrl":"","url":null,"abstract":"To investigate the cytotoxicity of three high copper amalgams (HA 1, HA 2 and HA 3) which are currently available in Japan, and compare with that of the conventional amalgams, i. e., fine cut, spherical and copper amalgams, a cell culture system with L strain fibroblasts was used. Results were assessed by cell multiplication rate calculated from cell nuclei counting and cell morphology. The results obtained were as follows: 1. Amalgam alloys of two of the high copper amalgams tested (HA 3 and HA 1) as well as two of the conventional amalgams, i. e., fine cut and spherical amalgams did not give adverse effects to the cells. However, the alloys of the other high copper amalgam, HA 2, and copper amalgam yielded intense cytotoxicity. 2. As to the triturated amalgams, two of the high copper amalgams (HA 3 and HA 1) showed a very similar effects to the cell to the fine cut and spherical amalgams. At three hours after trituration, depression of cell growth diminished in two of the high copper amalgams(HA 3 and HA 1). However, the other high copper amalgam, HA 2, yielded intense and persistent cytotoxicity even at 24 hours after after trituration. 3. Cell morphology of the experimental groups confirmed the above result of the rate of cell multiplication. 4. A similar biological effect to the results in several previous reports with three conventional amalgams in vitro was confirmed. It was discussed that difference of biological effects in vitro among the three high copper amalgams might be attributed to the alloy composition. It is considered that the present results will be able to lend suggestions to the use of the high copper amalgams.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 54","pages":"129-42"},"PeriodicalIF":0.0,"publicationDate":"1980-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17985762","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 the mechanical properties of a metal-ceramic restoration. (Part I) Estimation of the bond strength by pull-out test (author's transl)]. 金属-陶瓷修复体力学性能研究。(第一部分)通过拉出试验估算粘结强度[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1980-04-01

K Asaoka, N Kuwayama

{"title":"[Studies on the mechanical properties of a metal-ceramic restoration. (Part I) Estimation of the bond strength by pull-out test (author's transl)].","authors":"K Asaoka, N Kuwayama","doi":"","DOIUrl":"","url":null,"abstract":"Metal-ceramic composite materials as a porcelain fused to metal restoration, have been used for biomaterials. But the chief objection, to use of these materials as restorative materials, is its lack of strength, particularly tensile and shear strength. And the materials to have strong bond strength have been studied. On the other hand, the bond strength along metal-ceramic interface have usually measured by a pull out test. At the same time, the objection of the pull out test are pointed out. So, the deformation of metal-ceramic composite materials by the pull out test were simulated to use the axi-symmetric finite element method. And shear stress distribution along the interface and the principal stress distribution in ceramic were calculated. The following results were obtained. (1) Shear stress along the interface and maximum principal stresses in ceramic and in metal decrease rapidly along the interface. (2) The stress concentration factor as the case of the alloy with high Young's modulus is smaller than that of the alloy with low Young's modulus. So, the former would be stronger about the pull out test. (3) Metal-ceramic interface length is not affected for shear stress concentration. If the specimen has more than the critical interface length, the initial crack in ceramic would be occurred at the same pull out force.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 54","pages":"103-8"},"PeriodicalIF":0.0,"publicationDate":"1980-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18055969","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

[Preparation of hard crown and bridge resin without PMMA powder (III) (author's transl)]. [无PMMA粉末硬冠桥树脂的制备(III)[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1980-04-01

S Suzuki, K Nagata, N Nakabayashi, E Masuhara

引用次数: 0

[The influence of surface treatments on non-precious metal-ceramics alloys (author's transl)]. [表面处理对非贵金属陶瓷合金的影响(作者译)]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1980-04-01

E Kawada

{"title":"[The influence of surface treatments on non-precious metal-ceramics alloys (author's transl)].","authors":"E Kawada","doi":"","DOIUrl":"","url":null,"abstract":"In this study, the author attempted to find out the suitable methods of surface treatments for non-precious metal-ceramics alloys. Three Ni-Cr system alloys in the market, (Gemini II, Euro-ceram and Wiron S) were used. The shear bond strength was measured under the various conditions, varying the heating temperatures of pre-oxidation treatment and finishing methods of the metal surface. A specially designed apparatus which had been improved by the author, was used to measure the shear bod strength of the metal-ceramics. The following results were obtained. 1. The testing method improved was found better as a means of measuring the bond strength. Because the shear bond strength which was obtained by this testing method was hardly affected by the compressive force originating from porcelain contraction or the strength of alloys. 2. In the case of Gemini II and Euro-ceram, the influence of the finishing treatment on the properties was great. The coarser the surface roughness, the greater the value of the shear bond strength. 3. In the case of Wiron S, the influence of the pre-oxidation treatment was great. The higher the temperature of treatment, the greater the value of shear bond strength. 4. The optimum surface treatment of metal was obtained among three alloys respectively. The shear bond strength of Gemini II was greater than the others under any condition. In the case of Euro-ceram, the highest bond strength was obtained under the coarser surface condition regardless of the temperature of pre-oxidation treatment. In the case of Wiron S, the highest bond strength was obtained by the surface which was finished by the #600 emerypaper and the higher temperature of pre-oxidation treatment.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 54","pages":"150-62"},"PeriodicalIF":0.0,"publicationDate":"1980-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18055971","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