Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices最新文献_第6页

[Transverse strength and acoustic emission characteristics of commercial denture base resins]. 商品义齿基托树脂的横向强度和声发射特性。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01

S Kondo, S Ohkawa, T Hanawa, T Sugawara, M Ota

引用次数: 0

[In vitro metal dissolution under various extraction conditions]. 【不同提取条件下的金属体外溶出度】。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01

H Doi, S Takeda

{"title":"[In vitro metal dissolution under various extraction conditions].","authors":"H Doi, S Takeda","doi":"","DOIUrl":"","url":null,"abstract":"Dissolution of components from pure Ni, pure Ti, NiTi alloy and 316 L stainless steel was examined in Eagle's minimum essential medium to evaluate the effects of dynamic condition, pH, extraction period and filtration on the corrosion behaviour. Extraction medium was pH 3.5, 7.0 and 9.5. Extraction was done under static and gyrating conditions of 160 rpm, 200 rpm and 230 rpm for 3 and 7 days. Under static conditions, nickel was eluted from pure Ni and NiTi alloy at pH 3.5. Nickel and iron were slightly eluted from 316 L stainless steel at pH 3.5. However, dissolution of components from alloys was greater under dynamic conditions and with longer extraction periods. Dissolution of components, particularly of nickel at pH 3.5, was the highest from pure Ni, NiTi alloy and 316 L stainless steel. Following filtration with a 0.22 micron filter, the amount of metal decreased. Titanium was not detected in the filtrate under the conditions tested. The finding that a considerable amount of nickel was detected in the extract and filtrate indicated that the element was present in both a soluble and particulate form, especially at pH 3.5. The present results demonstrate that extraction under dynamic conditions is useful for investigating the degradation of metallic materials for medical and dental use.","PeriodicalId":77622,"journal":{"name":"Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290170","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

[Study on disintegration of glass ionomer cements. Effect of the starting time of immersion on the dissolution of Ca, Al and Si]. 玻璃离子水合物的崩解研究。浸液起始时间对Ca、Al和Si溶解的影响。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01

H Nomata

引用次数: 0

[Basic studies on radiopaque monomer. (3) Synthesis of monomers having Di-, tri-bromophenoxy groups, their properties, radiopacity and physical properties of their bulk polymers]. 不透射线单体的基础研究。(3)二、三溴苯氧基单体的合成及其性质、不透光性和本体聚合物的物理性质。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01

M Kobori

{"title":"[Basic studies on radiopaque monomer. (3) Synthesis of monomers having Di-, tri-bromophenoxy groups, their properties, radiopacity and physical properties of their bulk polymers].","authors":"M Kobori","doi":"","DOIUrl":"","url":null,"abstract":"Radiopaque monomers were synthesized to examine their properties and the physical properties of their bulk polymers, to obtain basic data for new radiopaque filling composite resin. Octachlorocyclotetraphosphazene (P4N4Cl8) was used as material to be synthesized, and 2,4,6-tribromophenol, (Br3C6H2OH) and 2,4-dibromophenol (Br2C6H3OH) were selected as organic compounds having radiopacity. As a polymerizing functional group, 2-hydroxyethylmethacrylate (HEMA) was used. Radipaque monomers were synthesized as follows: 1 Cl of P4N4Cl8 was replaced by 1 mol of 2,4,6-tribromophenol, or 2 Cls by 2 mols of 2,4-dibromophenol, and the remaining 7 or Cls were replaced by HEMA, polymerizing functional group, to obtain 2 kinds of radiopaque monomers; 4 PN-(Br3Ph)1-(EMA)7 and 4 PN-(Br2Ph)2-(EMA)6. The specific gravity of these monomers was 1.4629 and 1.4978, refractive index 1.5315 and 1.5423 and viscosity, 70 and 80 poise respectively. Radiopacity was measured by an X-ray apparatus. Al equivalent, of specimen, 10 phi x 3 mm, 4 PN-(Br3Ph)1-(EMA)7 was 5.8 mm and 4 PN-(Br2Ph)2-(EMA)6 7.0 mm. 4 PN-(Br3Ph)1-(EMA)7 and 4 PN-(Br2Ph)2-(EMA)6, both wet specimens, had compressive strength of 83.7 and 81.3 MPa, in transverse strength of 45.5 and 53.0 MPa and knop hardness of 25.8 and 22.6 respectively. After 7 days, 4 PN-(Br3Ph)1-(EMA)7 had water sorption of 1.46 wt%, and 4 PN-(Br2Ph)2-(EMA)6, 0.84 wt%, and solubility of 0.15 and 0.14 wt%, respectively.","PeriodicalId":77622,"journal":{"name":"Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290174","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

[Visible light cured resin. Change of quantity of remaining double bonds in the surface low conversion layer by FT-IR method]. 【可见光固化树脂】表面低转化层剩余双键数量的变化[FT-IR]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01

T Takahashi

{"title":"[Visible light cured resin. Change of quantity of remaining double bonds in the surface low conversion layer by FT-IR method].","authors":"T Takahashi","doi":"","DOIUrl":"","url":null,"abstract":"The quantity of the remaining double bonds (RDB) in polymerized visible light cured resins has been determined. Five trial unfilled resins, eight commercial composite resins and three commercial crown and bridge resins were investigated by Fourier transform infrared spectrophotometer with the liquid-film method. Infrared absorbance was measured before irradiation and at various times after irradiation. The quantity of RDB was determined and the data expressed as percentage of the total amount of double bonds in the unpolymerized resins. The quantity of RDB of five trial unfilled resins decreased linearly corresponding to the logarithmic time after the start of irradiation. The difference in the quantity of RDB at 5 min and decreasing rate of RDB could be seen in accordance with the kind of monomer. Among five trial unfilled resins, one with BMPEPP (BPE-200) used as monomer gave the smallest RDB, and one with 4 PN-(TF)2-(EMA)6 used as monomer gave the largest value. The quantity of RDB in the unfilled resin with Tri-EDMA at 5 min decreased in accordance with the irradiation time, but after 1 month, it showed almost the same value irrespective of the irradiation time. The quantity of RDB of commercial composite resins and crown and bridge resins decreased linearly corresponding to logarithmic time. In all commercial resins, the quantity of RDB became small when the base monomer was Bis-GMA but large when it was UDMA.","PeriodicalId":77622,"journal":{"name":"Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13305686","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

[Electron-probe microanalysis examination of acid-proof dentin layer]. [防酸牙本质层的电子探针显微分析检查]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01

T Fukushima, Y Inoue, M Kawaguchi, T Horibe

引用次数: 0

[Studies on gallium alloys for dental restorations. 2. Electron probe microanalysis for hardened gallium alloys]. 镓合金在口腔修复中的应用研究。2. 硬化镓合金的电子探针显微分析[j]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01

T Horibe, Y Okamoto, K Miyazaki

引用次数: 0

[Novel method to observe the interface between adhesive resin and dentin by staining Fe3+ with tannic acid]. [单宁酸染色Fe3+观察粘接树脂与牙本质界面的新方法]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01

K Takarada, T Nikaidou, M Kojima, N Nakabayashi

引用次数: 0

[Effect of 3-mercaptopropyltrimethoxysilane coupling agent on stainless steel and silica surface]. [3-巯基丙基三甲氧基硅烷偶联剂对不锈钢和二氧化硅表面的影响]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01

K Umemoto, S Kurata, K Shimoyama, A Yamanaka

引用次数: 0

[The development of visible light-cured composite resin. Kinds of fillers to be mixed with cyclophosphazene system monomers and its amount and its physical properties]. 可见光固化复合树脂的研制。[环磷酰胺体系单体混合填料的种类及其用量及其物理性能]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01

H Kikuchi, H Hirose, K Yoshihashi, M Anzai, M Ohashi

引用次数: 0