Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials最新文献_第7页

[Application to dental casting machine of the rapid heating infrared image furnace (author's transl)]. [快速加热红外成像炉在牙科铸造机上的应用[作者简介]。

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

Y Etchu, H Noguchi

{"title":"[Application to dental casting machine of the rapid heating infrared image furnace (author's transl)].","authors":"Y Etchu, H Noguchi","doi":"","DOIUrl":"","url":null,"abstract":"The authors tried to manufacture a casting machine in dentistry by application of the infrared image furnace with a high heating speed and an easy control of a heating temperature. This machine melts an alloy in a carbon crucible set in the furnace, held in the horizontal position. Then, the furnace is turned to the vertical position to drop a melted alloy on the casting mold, and the alloy is cast in the mold by the pressure of Argon gas. The functions of trial casting machine were follows. 1. The trial casting machine was capable of heating to 1250 degrees C within one minute under 4 kW electric power. 2. The castability of the 20% Au-Pd-Ag commercial alloy cast in all casting conditions by the trial casting machine was higher than that of Thermotrol D-2 automatic centrifugal casting machine. 3. Castings of the trial casting machine showed higher tensile strength and elongation than those of the centrifugal casting machine, and the deviation of values got by the trial casting machine was small. In particular, some casting of the trial casting machine showed three times or over elongation values as compared with those of the centrifugal casting machine. 4. When casting conditions (casting temperature, casting pressure) of the trial casting machine changed, the physical properties of castings did not change so much. However, when the mold was not prevented from heating by the furnace in casting, the elongation of castings increased.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 56","pages":"277-87"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18066119","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 and viscoelastic properties and problems on measurement methods of JIS for inlay waxes (author's transl)]. [JIS中嵌蜡的热、粘弹性性能及测量方法中的问题[作者简介]。

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

N Katakura, M Kawakami

引用次数: 0

[Studies on the dynamic durability of dental restorative materials. (Part 2) Properties for the repeated impact compressive load ot composite resins (author's transl)]. 牙体修复材料动态耐久性研究。(第2部分)复合树脂反复冲击压缩载荷的性能[作者简介]。

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

S Kondo, S Okawa, M Ota

{"title":"[Studies on the dynamic durability of dental restorative materials. (Part 2) Properties for the repeated impact compressive load ot composite resins (author's transl)].","authors":"S Kondo, S Okawa, M Ota","doi":"","DOIUrl":"","url":null,"abstract":"Based on the fracture energy form the compression test of composite resins under the repeated impact loads in compression after stored for a period in water at 37 degrees C, the dynamic durability of commercially used composite resins was evaluated. The results obtained were summarized as follows. (1) The fracture energy of composite resins under the repeated impact compressive loads after stored in water at 37 degrees C is clearly lower than the initial fracture energy. Particularly the decrement of the initial fracture energy for Concise, Epolite 100 and Superlux after stored for 30 days in water at 37 degrees C is influenced considerably both by the physicochemical degradation caused by water and the mechanical deterioration caused by the repeated impact compressive loads, but Clearfil is superior to the mechanical deterioration. (2) In each composite resins, there is a close correlation between fracture energy and compressive strain. In composite resins without Superlux, also a correlation is in fracture energy and compressive strength. (3) In clearfil, concise and Epolite 100, the morphology of fracture in compression test of composite resins which are subjected to and are subjected to the repeated impact loads in compression is classified in a mode of shear fracture, but in Superlux, a mode of crack fracture.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 56","pages":"253-62"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17989845","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

[Effects of Au content on ageing characteristics of Dental AG-Pd-Cu-Au alloys (I). Ageing characteristics of the alloys quenched from 800 degrees C designated by JIS as solution treatment temperature (author's transl)]. [Au含量对牙科AG-Pd-Cu-Au合金时效特性的影响(I).按JIS定溶处理温度800℃淬火合金的时效特性(作者译)]。

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

S Tanaka

{"title":"[Effects of Au content on ageing characteristics of Dental AG-Pd-Cu-Au alloys (I). Ageing characteristics of the alloys quenched from 800 degrees C designated by JIS as solution treatment temperature (author's transl)].","authors":"S Tanaka","doi":"","DOIUrl":"","url":null,"abstract":"Commercial Ag-Pd-Cu-Au alloys of which Au content was changed form 0 to 50 wt. % were quenched from 800 degrees designated by JIS as solution treatment temperature and aged isochronically. The maximum hardness of the alloys by ageing decreased with increasing the Au content. Shape of age-hardening curve of the alloys was divided into two groups, one was of the lower Au content alloys containing below 30 wt. / Au and the other was of the higher Au content alloys containing more than 40 wt. % Au. As quenched structure of the lower Au content alloys was mixture of f.c.c alpha 2 phase and L20 type ordered phase (beta phase), on the other hand, the higher Au content alloys was composed simply by f.c.c alpha phase only. The maximum hardness of the lower Au content alloys given by ageing was caused by precipitates appeared at grain boundary, and of the higher Au content alloys was caused by precipitates in the grain were found. These facts may suggest that the mechanism of age hardening for the alloys change with increasing the Au content.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 56","pages":"263-70"},"PeriodicalIF":0.0,"publicationDate":"1980-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17989846","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

[Japanese and foreign literature on dental engineering (21) 1979]. [牙科工程的日本和外国文献(21)1979]。

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

引用次数: 0

[Effects of au content on ageing characteristics of dental Ag-Pd-Cu-Au alloys (II). Change in ageing characteristics by different solution treatment temperature (author's transl)]. [au含量对牙科Ag-Pd-Cu-Au合金老化特性的影响(II).不同固溶处理温度下老化特性的变化[作者简介]。

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

S Tanaka

引用次数: 0

Biocompatibility of dental amalgams in vitro during 52 week period. 牙用汞合金体外52周的生物相容性。

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

M Nakamura, H Kawahara, Y Kataoka, S Maehara, M Izutani, H Taguchi

引用次数: 0

[Study on the setting reaction of the zinc phosphate dental cement (1). Effects of aluminum in liquid on setting reaction (author's transl)]. [磷酸锌牙水泥固化反应的研究(1).液体中铝对固化反应的影响(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

[Viscoelastic behaviour of inlay waxes (part 1). Physical and dynamic viscoelastic properties of several raw material waxes (author's transl)]. [镶嵌蜡的粘弹性特性(第1部分).几种原料蜡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 : 1980-07-01

N Katakura

{"title":"[Viscoelastic behaviour of inlay waxes (part 1). Physical and dynamic viscoelastic properties of several raw material waxes (author's transl)].","authors":"N Katakura","doi":"","DOIUrl":"","url":null,"abstract":"Several raw material waxes used in the inlay waxes, such as paraffins, carnauba wax, beeswax and dammar 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. The solid-solid phase transition from orthorhombic to hexagonal occurred in paraffins and the difference of the crystal transition temperature was observed between the kinds of paraffins. The viscoelastic properties and the thermal expansion of paraffins changed considerably in the crystal transition temperature region. Carnauba wax was an orthorhombic material, but such a crystal transition as paraffins did not appear. The dynamic modules of carnauba wax was greater than that of paraffin and decreased slowly to 70 degrees C and the loss tangent was small in this region. It was found, therefore, that carnauba wax had an elastic property in the crystal transition region of paraffin. Beeswax was also an orthorhombic material. The dynamic modulus of this was smallest in these waxes and the loss tangent increased relatively slowly with increases in temperature. Dammar was an amorphous solid. The dynamic modulus and the loss tangent were approximately constant in the low temperature region and changed greatly in the glass transition region. The thermal expansion of dammar was smallest in these waxes.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 55","pages":"209-16"},"PeriodicalIF":0.0,"publicationDate":"1980-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17985570","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

Biting pressure measured with pressure measuring sheet. 用测压片测量咬口压力。

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

S Hirano, T Hirasawa

引用次数: 0