Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials最新文献_第6页

[On method of impact test for composite resins (author's transl)]. [关于复合树脂冲击试验方法(作者简介)]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1981-01-01

S Hirabayashi, H Miyake, H Sugita, T Hirasawa

引用次数: 0

[ADA specification No. 19 for non-aqueous, elastomeric dental impression material]. [美国牙科协会规范第19号:非水弹性牙印模材料]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1981-01-01

T Hirasawa, I Harashima

引用次数: 0

Metallographic polishing technique for high-copper amalgam. 高铜汞合金金相抛光技术。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1981-01-01

M B Butts, T Okabe, C W Fairhurst

引用次数: 0

[Viscoelastic behaviour of inlay waxes. (Part 2) Physical and dynamic viscoelastic properties for binary mixtures of waxes (author's transl)]. 镶嵌蜡的粘弹性行为。(第2部分)二元蜡混合物的物理和动态粘弹性特性[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1981-01-01

N Katakura

{"title":"[Viscoelastic behaviour of inlay waxes. (Part 2) Physical and dynamic viscoelastic properties for binary mixtures of waxes (author's transl)].","authors":"N Katakura","doi":"","DOIUrl":"","url":null,"abstract":"Binary mixtures of waxes added carnauba wax, beeswax or dammar to paraffin were investigated by measurements of X-ray diffraction, dilatometry, differential thermal analysis and dynamic viscoelasticity. The relationships between the viscoelastic behaviour and the physical properties of these waxes were discussed. Additions of carnauba wax to paraffin changed drastically viscoelastic properties of paraffin, that is, increased the dynamic modulus, G', and decreased the loss tangent, tan delta, in the region of higher temperatures including the crystal transition temperature region of paraffin. The possible explanation for this change of viscoelastic properties is that the presence of crystals of carnauba wax composed of longer chain molecules than that of paraffin rises interfacial interaction. The temperature dependence of viscoelastic properties for binary mixtures of paraffin and beeswax was approximately the same as that of paraffin. This is because paraffin and beeswax may form a sort of homogeneous phases. Additions of dammar to paraffin increased the elasticity of paraffin in the region of lower temperatures, but did not effected to change of G' and tan delta in the region of higher temperatures. Another effect of additions of dammar was to lower the thermal expansion of binary mixtures.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"22 57","pages":"56-62"},"PeriodicalIF":0.0,"publicationDate":"1981-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17993090","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

Mechanism of the anisotropic dimensional change of the wax pattern prepared by the softened wax technique. (1) Relationship between recovery and crystal orientation. 软蜡工艺制备的蜡样各向异性尺寸变化机理。(1)恢复与晶体取向的关系。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1981-01-01

K Watanabe

{"title":"Mechanism of the anisotropic dimensional change of the wax pattern prepared by the softened wax technique. (1) Relationship between recovery and crystal orientation.","authors":"K Watanabe","doi":"","DOIUrl":"","url":null,"abstract":"In order to obtain information on the behavior of wax pattern distortion and to reveal its mechanism, the following experiments have been conducted: measurements of fundamental properties including distribution of molecular weight, crystal structure, phase transition, and viscosity, and investigation of the crystal orientation and recovery phenomena. If the wax is deformed plastically at higher temperatures, transformation appears to be a smooth transition from an isotropic distribution of the crystal orientation to an arranged structure. In the case of uniaxial compression, the c-axes are rearranged parallel to the compressed direction and the b-axes and a-axes are randomly oriented in the plane normal to the c-axes. This preferred orientation is due to the crystal rotation. The degree of preferred orientation increases with the increase in compression ratio over all temperatures between 35 degrees C and 55 degrees C. Above 45 degrees C, the degree of orientation decreases with an increase in temperature despite the equal compression ratio. From this fact, the degree of orientation is associated with the crystallinity at deformation temperatures as well as the degree of deformation. The preferentially oriented specimen expands greatly in the direction parallel to the molecular chain axis and shrinks to a great extent in the direction perpendicular to the chain axis. This anisotropy is caused mainly by the recovery. Moreover, the extent of recovery is associated closely with the degree of the preferred orientation. The dimensional change due to the recovery is extraordinarily large (30 to 40%) in comparison with the normal thermal expansion from room temperature to 45 degrees C (approximately 1.2%). This large extent of recovery is explained by the rubber-like deformation in the amorphous region.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"22 57","pages":"63-96"},"PeriodicalIF":0.0,"publicationDate":"1981-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18070143","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

[Investigations of sag-resistance of precious alloys for porcelain fusing. (Part 2) The effect of Fe, In, Sn addition on the distortion at high temperature of 85% Au alloys for porcelain fusing (author's transl)]. 熔瓷用贵重合金抗下垂性能的研究。(第二部分)添加Fe、In、Sn对85% Au合金高温熔接变形的影响[作者论文]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1981-01-01

S Kojima

引用次数: 0

[Investigations of Sag-resistance of precious alloys for porcelain fusing. (Part 1) Measuring method and analysis (author's transl)]. 熔瓷用贵重合金抗下垂性能的研究。(第一部分)测量方法与分析[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1981-01-01

S Kojima

引用次数: 0

[Studies on Au-Ag-Pd-Cu alloys. (Part 3) Effects of additional elements to Au-Ag-Pd-Cu alloys (author's transl)]. Au-Ag-Pd-Cu合金的研究。(第三部分)添加元素对Au-Ag-Pd-Cu合金的影响[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1981-01-01

K Okazaki

{"title":"[Studies on Au-Ag-Pd-Cu alloys. (Part 3) Effects of additional elements to Au-Ag-Pd-Cu alloys (author's transl)].","authors":"K Okazaki","doi":"","DOIUrl":"","url":null,"abstract":"In the previous papers, the author pointed out that alloys containing 30 wt% Au, 15-25 wt% Pd and Cu were more favourable for Au-Ag-Pd-Cu quarternary dental alloys. In this paper, the experiments were carried out to find the effects of additional elements and so, Pt, Ir, Os, W, Mo, Cr, Mn, Co, Zn, In, Sn and Si were added to 30 wt% Au-30 wt% Ag-20 wt% Pd-20 wt% Cu alloys ranging 0.1 wt% to 2.0 wt% respectively. Then, tensile strength, elongation, hardness, corrosion resistivity and porosity ratio were tested on these specimen. Results were as follows. 1) The addition of 0.2 wt% Ir, 0.2 wt% Os and 1.0 wt% Co were comparatively effective for the fineness of grain sizes, elongation and tensile strength. 2) The addition of 0.2 wt% W, 1.0 wt% Mo and 0.2 wt% Si showed respectively bad effect for porosities or mechanical properties. 3) The addition of 1.0 wt% Cr, 2.0 wt% Mn, 1.0 wt% Co, 2.0 wt% Zn and 2.0 wt% In were good for the decrease of porosities respectively and showed that the porosity ratio was lower than 0.2%. 4) The additions of 2.0 wt% Zn-1.0 wt% Pt-0.5 wt% Co to Au-Ag-Pd-Cu alloy was especially good and showed 80 kg/mm2 of tensile strength, 5.1% of elongation, 249 of Vicker's hardness number and 0.4% of porosity ratio.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"22 57","pages":"12-20"},"PeriodicalIF":0.0,"publicationDate":"1981-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17991771","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 fluidity of alloys in high temperature. (Part 2) The fluidity of 20% Au-Ag-Pd-Cu alloy (author's transl)]. 合金在高温下的流动性。(第二部分)20% Au-Ag-Pd-Cu合金的流动性[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1981-01-01

H Inaba

引用次数: 0

[Revision for denture base resin: ADA Specification No. 12]. [义齿基托树脂修订:ADA规范第12号]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1980-10-01

T Hirasawa, S Hirabayashi

引用次数: 0