Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials最新文献_第9页

[Studies on Au-Ag-Pd-Cu alloys. (Part 2) Some properties on alloys containing 30 wt% Au (author's transl)]. Au-Ag-Pd-Cu合金的研究。(第二部分)含金30wt %合金的一些性能[作者简介]。

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

K Okazaki

{"title":"[Studies on Au-Ag-Pd-Cu alloys. (Part 2) Some properties on alloys containing 30 wt% Au (author's transl)].","authors":"K Okazaki","doi":"","DOIUrl":"","url":null,"abstract":"In the previous paper, the author reported 30 wt% Au was more favourable content in Au-Ag-Pd-Cu quaternary dental alloys. In this paper, the experiment was carried out to find suitable Pd and Cu content in 30 wt% Au-Ag-Pd-Cu alloy. Pd and Cu content was changed from 5 wt% to 25 wt% and from 10 wt% to 20 wt% respectively. Ag content was balanced, and no other metals was added. Range of solidification temperature, tensile strength, elongation, hardness, corrosion resistivity and castability were tested. Results were as follows. 1) In these alloys, liquidus points were in the range of 880 degree C approximately 140 degree C, but in the majority of alloys, liquidus points were under 1100 degree C. Range of solidification temperature was more narrow in 20 wt% Cu than other Cu content. 2) The tensile strength and elongation of swaged specimens increased as Pd content increased, but in case of cast specimens, mechanical properties were the highest at 15 approximately 20 wt% Pd. The Vicker's hardness was in the range of 116 to 235. 3) The corrosion test in 0.1% Na2S solution indicated that the corrosion resistance was increased with Pd content and alloys contained more than 20 wt% Pd showed good resistance to corrosion. 4) The castability was affected by the Pd content and much decreased between 15 wt% Pd and 20 wt% Pd, but the castability of these alloys is twice as good as the alloys on the market. From these results, it seemed that the alloys containing 15 approximately 20 wt% Pd and 15 approximately 25 wt% Cu were more favourable composition to 30 wt% Au-Ag-Pd-Cu alloys.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 54","pages":"109-21"},"PeriodicalIF":0.0,"publicationDate":"1980-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17983419","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

[Measurement of casting shrinkage with U-type tungsten die (author's transl)]. 用u型钨模测量铸件收缩率[作者简介]。

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

A Nakai, K Nakamura, S Seki, K Kakuta, J Kawashima

{"title":"[Measurement of casting shrinkage with U-type tungsten die (author's transl)].","authors":"A Nakai, K Nakamura, S Seki, K Kakuta, J Kawashima","doi":"","DOIUrl":"","url":null,"abstract":"A simple method was developed for the accurate measurement of casting shrinkage using a U-type tungsten die. A wax pattern was prepared on the die and both were invested together in phosphate bonded investment. Cobalt-chromium alloy, Regalloy shot 2, was cast and its shrinkage was calculated from the distance of the gap created between the die and the cast piece. In order to evaluate the effects of some manipulative variables on the cast shrinkage value of the alloy, mold temperature, kind of liquid for the investment and powder/liquid ratio were varied and shrinkage values were obtained. The results showed that the shrinkage value was not affected by the kind of liquid and the power/liquid ratio, but significantly decreased as the mold temperature raised up to 600 degree C. However, this effect was eliminated by means of substractive correction of the thermal expansion of the tungsten die. Thus, the casting shrinkage of the cobalt-chromium alloy, Regalloy shot 2, was calculated to be 2.08 +/- 0.02%. The casting shrinkage of pure gold was also measured with the same procedure. The casting shrinkage was calculated to be 1.73 +/- 0.04% and highly consistent with the value (1.74%) reported by R. Earnshaw. This suggested that the developed method was sufficiently effective for the accurate measurement of casting shrinkage.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 54","pages":"122-8"},"PeriodicalIF":0.0,"publicationDate":"1980-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18055970","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

[Heat treatment of gold alloy to get adhesion with resin (author's transl)]. [热处理金合金以获得与树脂的附着力(作者简介)]。

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

T Tanaka, K Nagata, M Takeyama, N Nakabayashi, E Masuhara

引用次数: 0

[Study on excellent bending strength and expansibility of carboxylate cement (author's transl)]. [羧酸盐水泥优异抗弯强度和膨胀性能的研究[作者简介]。

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

M Takahashi, O Ishikawa, K Kato

引用次数: 0

[Studies on Pd base ternary alloys for dental amalgam. (Part 2) On the corrosion resistivity (author's transl)]. 牙科用银汞合金钯基三元合金的研究。(第二部分)腐蚀电阻率(作者简介)。

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

I Yasumura

{"title":"[Studies on Pd base ternary alloys for dental amalgam. (Part 2) On the corrosion resistivity (author's transl)].","authors":"I Yasumura","doi":"","DOIUrl":"","url":null,"abstract":"In the previous paper, the author reported the effect of composition of Pd base ternary alloys on the dimensional change, the compressive strength, hardness and microanalysis by EPMA. In this paper, corrosion resistivity of Pd base ternary alloy amalgam was studied by comparison of reflective light intensity, surface roughness and weight change before and after corosion test in 0.1% Na2S, 0.1% lactive acid and 1% NaCl solution. The main results obtained are as follows: (1) Pd base ternary alloy amalgam showed much higher corrosion resistivity than that of on the market silver-tin-copper amalgam. (2) On the (60 Pd-40 Ag)-Sn alloy amalgam, corrosion resistivity was gradually improved by addition of Sn up to 10 wt% Sn, and the best corrosion resistivity was observed in (60 Pd-40 Ag)-10 Sn among Pd base alloy amalgam tested in this study. (3) On the (60 Pd-40 Ag)-Cu alloy amalgam, corrosion resistivity decreased gradually with increment of Cu content. (4) Weight of (60 Pd-40 Ag)-Sn alloy amalgam was a little increased after corrosion test in 0.1% Na2S solution, but that of (60 Pd-40 Ag)-Cu alloy amalgam showed a tendancy to decrease. (5) Corrosion of Pd base alloy amalgam was observed mainly in the matrix. Tarnish on the core was observed a little. Since fine cut amalgam has the smaller rate of area of core than that of spherical amalgam, surface roughness was comparatively large.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 53","pages":"69-77"},"PeriodicalIF":0.0,"publicationDate":"1980-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17980201","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 performance of the dental air turbine handpieces. (Part 3) Torque measurements of the air turbine handpieces (author's transl)]. 牙科空气涡轮机头的性能研究。(第3部分)空气涡轮机头的扭矩测量[作者的翻译]。

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

H Miyairi, M Nagai, H Fukuda, A Muramatsu

引用次数: 0

[Physical properties of resins for veneer crown. (Part 2) Bending strength and retention force of opaque resins (author's transl)]. 贴面冠用树脂的物理性质。(第二部分)不透明树脂的抗弯强度和保持力[作者简介]。

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

T Kashiwada

引用次数: 0

[Studies on the performance of the dental air turbine handpieces. (Part 2) Classification and rotational performance of the dental air turbine handpieces (author's transl)]. 牙科空气涡轮机头的性能研究。(第2部分)牙科空气涡轮机头的分类和旋转性能[作者简介]。

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

H Miyairi, M Nagai, A Muramatsu

引用次数: 0

[Studies on bonding between Ni alloys and porcelain--effect of addition of Cr and Co to Ni alloys (author's transl)]. [Ni合金与瓷的结合研究——在Ni合金中加入Cr和Co的影响[作者简介]。

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

T Kawasaki

引用次数: 0

[Preparation of carbon fiber reinforced fluid type resin denture (author's transl)]. 【碳纤维增强液体型树脂义齿的制备(作者简介)】。

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

H Kasuga, H Sato, N Nakabayashi

引用次数: 0