Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices最新文献_第4页

[The direct tensile test of composite resins using the small specimen--effect of the preparation of specimen, the size of specimen and the testing condition on the tensile properties]. 【复合树脂小试件直接拉伸试验——试样制备、试样尺寸及试验条件对拉伸性能的影响】。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-09-01

A Fujishima, T Miyazaki, H Kuneshita, E Suzuki, T Miyaji

引用次数: 0

[Mechanical properties and curing depth of urethane tetramethacrylate-based composite resins]. [聚氨酯四甲基丙烯酸酯基复合树脂的力学性能和固化深度]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-09-01

M Kawaguchi, T Fukushima, T Horibe, T Watanabe

引用次数: 0

[Experimental development of a chitosan-bonded hydroxyapatite bone filling paste]. [壳聚糖键合羟基磷灰石骨填充膏的实验研制]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-07-01

M Ito, T Yamagishi, T Sugai

{"title":"[Experimental development of a chitosan-bonded hydroxyapatite bone filling paste].","authors":"M Ito, T Yamagishi, T Sugai","doi":"","DOIUrl":"","url":null,"abstract":"Chitosan, a naturally occurring high molecule or weight polymer which is stable in vivo like collagen, has proved a useful biomaterial in applications such as suture thread and artificial skin. A hydroxyapatite bone-filling material was developed with chitosan sol as a binder. Measurements were made of the solubility of chitosan, and of the setting time, compressive strength, and pH value of the material. X-ray microanalysis and diffraction analysis of the material were also conducted. Chitosan is freely soluble in malic acid and succinic acid, but insoluble in citric acid and oxalic acid. The setting time of the bone-filling material tended to decrease with increase in the amounts of its CaO and ZnO components. The setting time increased with increasing ratio of sol to other (powdered) ingredients. The pH value decreased with increasing ratios of chitosan sol to the powdered ingredients. High pH values resulted from increases in both CaO and ZnO. The time between the preparation of the chitosan sol and the onset of kneading significantly affected the compressive strength of the material when set. The strength measured roughly 50% more for times between 90 and 150 minutes than for times shorter or longer than that range. Greater compressive strength was generally observed for increases in both CaO and ZnO. The results of the X-ray microanalysis of the hardened paste showed calcium crystals other than hydroxyapatite.","PeriodicalId":77622,"journal":{"name":"Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices","volume":"9 4","pages":"608-16"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288916","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

[Application of gypsum-bonded investment containing niobium carbide on casting of alloy for metal-ceramic restoration]. [含碳化铌石膏粘结熔模在金属陶瓷修复用合金铸造中的应用]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-07-01

S Tsuruta, S Ban, J Hasegawa, S Hayashi, K Iiyama, Y Yamamura

引用次数: 0

[Determination of titanium flow by the tracer element molten method in the dental precision casting. 1. The principle of flow visualization and application to simple castings]. 用示踪元素熔融法测定牙齿精密铸造中钛的流动。1. 流动可视化原理及其在简单铸件中的应用[j]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-07-01

K Watanabe, S Okawa, O Miyakawa, S Nakano, N Shiokawa, M Kobayashi

引用次数: 0

[Adaptability of composite resin inlays. 1. Adaptability to the experimental MOD cavity prepared in an acrylic block]. 复合树脂镶嵌体的适应性。1. 在丙烯酸块中制备实验模腔的适应性]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-07-01

T Suzuki, S Hosoki, S Wakumoto

引用次数: 0

[Thermal properties of human teeth and dental cements]. [人类牙齿和牙水泥的热特性]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-07-01

Y Minesaki

引用次数: 0

[Influences of composition on brush wear of composite resins. Influences of particle size and content of filler]. 复合树脂成分对电刷磨损的影响。填料粒径及含量的影响[j]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-07-01

S Yuasa

{"title":"[Influences of composition on brush wear of composite resins. Influences of particle size and content of filler].","authors":"S Yuasa","doi":"","DOIUrl":"","url":null,"abstract":"The influences of the composition on abrasion resistance of composite resins were examined using various experimental composite resins which had various matrix resin, filler size and content. The abrasion test was conducted by the experimental toothbrush abrasion testing machine developed in our laboratory. Three series of heat-curing composite resins were tested. One series was made from a Bis-MPEPP or UDMA monomer, and a silica filler with an average particle size of 0.04, 1.9, 3.8, 4.3, 7.5, 13.8 and 14.1 microns. The filler content of this series was constant at 45 wt%. The second series contained a silica filler of 4.3 microns in a content ranging from 35 to 75 wt%. The third series contained a microfiller (0.04 microns) and macrofiller (4.3 microns) in total content of 45 wt%. In this series, the microfiller was gradually replaced by 5, 15, 25 and 45 wt% of the macrofiller. The results obtained for these three series indicated that the abrasion resistance of composite resins was controlled by the inorganic filler, mainly filler size and content. The abrasion loss did not vary with the difference of matrix resin. When the particle size of the filler was below about 5 microns, the abrasion resistance decreased markedly with the decrease in filler size. The composite resin which contained a 0.04 or 1.9 micron filler was less resistant to toothbrush wear than the unfilled matrix resin. However, the microfiller also contributed to abrasion resistance when used in combination with the macrofiller, although abrasion resistance decreased with the increase in the microfiller concentration. The increase of filler content clearly improved the abrasion resistance when used the macrofiller. The analysis of these results and SEM observations of the brushed surfaces of samples suggested that the toothbrush abrasion was three-body abrasion caused by the abrasive in the toothpaste, and affected by the difference in the particle size between abrasive and filler, and between the abrasive size and the interparticle distance of the filler.","PeriodicalId":77622,"journal":{"name":"Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices","volume":"9 4","pages":"659-78"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13288922","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

[Strength and transparency of dental porcelain consisting of high refractive germanate-glass and alumina crystal]. [由高折射锗酸玻璃和氧化铝晶体组成的牙科瓷的强度和透明度]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-07-01

M Kon

{"title":"[Strength and transparency of dental porcelain consisting of high refractive germanate-glass and alumina crystal].","authors":"M Kon","doi":"","DOIUrl":"","url":null,"abstract":"A translucent aluminous porcelain was developed for dentistry. The effects of refractive indexes and sintering behaviors on transparency and strength of the aluminous porcelains consisting of high refractive germanate-glass (Na2O-TiO2-GeO2) and alumina crystal powders were examined. The various germanate-glass specimens with a high refractive index were made by fusion at about 1,300 degrees C. The refractive indexes of fused Na2O-TiO2-GeO2 glass specimens were 1.64-1.76, heightened with an increasing TiO2 content. The sintered aluminous porcelains were made from the mixed compacts consisting of 80 wt% germanate-glass and 20 wt% alumina at the densification temperature of 580-820 degrees C. Sintered aluminous porcelains prepared with high refractive germante-glass had a high transparency compared with the other aluminous porcelains, with almost the same transparency as a commercial feldspathic porcelain (body). Aluminous porcelains had lower transparency with different refractive index due to generation of crystals following the crystallization of glass matrix than that without crystallizing property. Bending strength value was 120 MPa, which is similar to that for the glass-alumina ceramics with the same content of alumina volume as germanate-glass aluminous porcelains. Non-crystallized aluminous porcelain had a higher strength compared with the crystallized one.","PeriodicalId":77622,"journal":{"name":"Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices","volume":"9 4","pages":"600-7"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289651","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

[Physical properties of light-cured opaque resin. (1) Influence of monomer composition]. 光固化不透明树脂的物理特性。(1)单体组成的影响]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-07-01

K Yoshida, H Matsumura, T Tanaka, M Atsuta

{"title":"[Physical properties of light-cured opaque resin. (1) Influence of monomer composition].","authors":"K Yoshida, H Matsumura, T Tanaka, M Atsuta","doi":"","DOIUrl":"","url":null,"abstract":"Light-cured opaque resins with excellent physical properties were prepared using five types of monomer liquid and titanium dioxide as the powder. The five opaque resin monomer liquid had the following monomer compositions. Methyl methacrylate (MMA)/di(methacryloxyethyl) trimethylhexamethylene diurethane (UDMA) = 70/30 (M-U), MMA/neopenthylglycol dimethacrylate (NPG)/UDMA = 45/45/10 (M-N-U), UDMA/MMA = 70/30 (U-M), 2,2-bis (4-methacryloxypolyethoxy phenyl) propane (2.6 E)/2,2-bis [4-(3-methacryloxy-2-hydroxy propoxy) phenyl] propane (Bis-GMA)/triethyleneglycol dimethacrylate (3 G) = 60/35/5(2.6-B-3) and 3 G/UDMA = 70/30 (3-U) by weight. The bond strength, photo-curability and handling properties of the opaque resin were improved. Three MMA-based opaque resins showed nearly the same values in Knoop hardness number, diametral tensile strength and shear bond strength. The depth of cure increased with the decrease in MMA content of monomer composition, while the amount of residual monomer decreased. The 2.6-B-3 opaque resin had nearly the same properties in depth of cure and Knoop hardness number as the 3-U opaque resin. However, the 2.6-B-3 and 3-U opaque resins had a diametral tensile strength more than twice as high as that of the U-M opaque resin. The bond strength of three MMA-based opaque resins showed 0MPa after 5,000 thermocycles, while the 2.6-B-3 opaque resin, about 16 MPa, and the 3-U opaque resin, about 25 MPa. Therefore, the bond strength of the opaque resin was influenced by monomer composition. 3G-UDMA opaque resin showed excellent physical properties and may be clinically acceptable to bond fixed prosthodontic composite.","PeriodicalId":77622,"journal":{"name":"Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices","volume":"9 4","pages":"583-90"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13305681","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