Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices最新文献_第8页

[Diffusion bonding of hydroxyapatite ceramics and biometals]. 羟基磷灰石陶瓷与生物金属的扩散键合。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01

F Yamane

引用次数: 0

[Classification and several mechanical properties of core composite resins]. [芯型复合树脂的分类及几种力学性能]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01

T Yamada, H Hosoda, T Tsurugai

引用次数: 0

[Study on visible-light curing soft resins consisting of fluoropolymers. 1. Effect of fluoroalkyl methacrylate monomers]. 含氟聚合物软树脂的可见光固化研究。1. 甲基丙烯酸氟烷基单体的影响[j]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01

Y Ohe, Y Kadoma, Y Imai

引用次数: 0

[Pre-treatment of porcelain surface for adhesive restorations]. 【粘接修复瓷面预处理】。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01

M Imai

{"title":"[Pre-treatment of porcelain surface for adhesive restorations].","authors":"M Imai","doi":"","DOIUrl":"","url":null,"abstract":"The effects of pre-treatment of porcelain surfaces, such as etching and treatment with a silane coupling agent, for obtaining firm adhesion between the adhesive resin, Panavia EX, and the porcelain were examined. The effects of heating treatment (100, 150 and 200 degrees C) in applying the silane coupling agents to porcelain surfaces were examined. Infrared spectra and energy dispersive X-ray spectra were obtained for the porcelain surface, on which a silane coupling agent was applied. A stable shearing adhesive strength, such as 450-520 kgf/cm2, was obtained even after a 24-hour immersion in 37 degrees C water, when with the etching the porcelain surface was pretreated with a 30% HF solution (60 sec) or heating treatment (150 degrees C, 10 min) when applying the silane coupling agent (2% gamma-MPTS). Then the adhesive durability was examined by a thermal cycling test (4-60 degrees C, 60 sec). After the thermal cycling test (20,000 times), the adhesive strength to the porcelain surface polished by #600 sand-paper was strong and only when the 2% gamma-MPTS was used did detachment occur. However, the adhesive strength was maintained at about 70-80% of the early strength with the etching treatment by the pre-treatment with 30% HF for 60 sec and the heating treatment (150 degrees C, 10 min) when applying the 2% gamma-MPTS.","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":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289576","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 dental cements. 1. The cored structure of three luting cements obtained by using Cryo-SEM and image analyzer]. 牙水泥的研究。1. 采用冷冻扫描电镜(Cryo-SEM)和图像分析仪(image analyzer)获得了三种luting胶结物的核芯结构。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01

H Hosoda, T Yamada, M Nakajima, L Perinka

引用次数: 0

[Estimation of fatigue parameter and life-time prediction using SPT diagram for hydroxyapatite coating layer in 37 degrees C distilled water]. [37℃蒸馏水中羟基磷灰石涂层SPT图疲劳参数估算及寿命预测]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01

N Wakamatsu, T Goto, M Adachi, S Imura, K Hayashi, H Kamemizu, M Iijima, T Gyotoku, S Shibata, T Horiguchi

{"title":"[Estimation of fatigue parameter and life-time prediction using SPT diagram for hydroxyapatite coating layer in 37 degrees C distilled water].","authors":"N Wakamatsu, T Goto, M Adachi, S Imura, K Hayashi, H Kamemizu, M Iijima, T Gyotoku, S Shibata, T Horiguchi","doi":"","DOIUrl":"","url":null,"abstract":"Lifetime and survival probability of brittle materials under given conditions of stress distribution, environment and component size can be predicted using an SPT (Strenght-Probability-Time) diagram. The SPT diagram for sintered hydroxyapatite (HAP) coated on the metal substrate via the fused glass was drawn and the safe working stress in 37 degrees C distilled water was estimated. The dynamic fatigue test carried out in 37 degrees C distilled water gave the fatigue parameter n = 19 for sintered HAP. This parameter is constant except that it depends on material and environment, and the greater the value of n, the greater the resistance to fatigue failure. For sintered HAP, therefore, the resistance to fatigue failure under this wet condition is low. To draw the SPT diagram, anchor points were taken from the fracture stress and time-to-failure data measured at 1 mm/min. The SPT diagram obtained suggested that a lifetime of 20 years with survival probability of 99.9% required the safe working stress of less than 3.2 MPa. The effects of accuracy of fatigue parameter on the uncertainty in SPT diagram were estimated.","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":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290469","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

[Finite element analysis on physiological mobility of individual teeth]. 个体牙齿生理活动性的有限元分析。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01

T Miki, K Asaoka, N Kuwayama, T Kawata

{"title":"[Finite element analysis on physiological mobility of individual teeth].","authors":"T Miki, K Asaoka, N Kuwayama, T Kawata","doi":"","DOIUrl":"","url":null,"abstract":"The initial movement of the tooth was investigated by the finite element method. The mechanical properties of the periodontal membrane were estimated from the results of the simulation. The analysis was made by using an 8 point isoparametric finite element method. The upper central incisor with an axial directional load was simulated. The concept of the apparent elastic modulus was introduced to the stress-strain relation of the soft tissue, that is, soft tissue such as the periodontal membrane and the gingiva was considered to have stress dependent elastic moduli. At the first stage of the simulation, the stress and strain distributions in the paradentium were calculated by the conventional method. From the next stage, the apparent elastic moduli for the soft tissue were introduced to the calculation, that is, the elastic moduli for the soft tissue were computed from the calculated equivalent stresses of the previous stage. The calculations were repeated until the displacement values converged. The initial displacement of the tooth was not proportional to the applied load but showed a non-linear relationship. The relationship between load and displacement was approxiated by the n-th power equation. These results were in agreement with the clinical experimental results. The periodontal membrane is built up of different elastic moduli. The elastic moduli were low at the alveolar edge and the root apex. The equivalent stresses of the periodontal membrane were marked low in the alveolar edge and the root apex. In conclusion, the concept of the apparent elastic modulus is useful to investigate the initial movement of the tooth and estimate the mechanical properties of the periodontal membrane.","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":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13290470","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 of pure titanium electrolytic polishing]. 【纯钛电解抛光研究】

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01

N Morita

引用次数: 0

[Development of dental quick casting with zircon-phosphoric acid investments]. 锆-磷酸熔模牙科快速铸造的研究进展。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01

R Fukumoto

{"title":"[Development of dental quick casting with zircon-phosphoric acid investments].","authors":"R Fukumoto","doi":"","DOIUrl":"","url":null,"abstract":"The application of zircon (ZrSiO4) that has high refractoriness, high thermal conductivity and a low coefficient of thermal expansion, to quick casting investment was studied. Various zircon powders and phosphoric acid solutions were tested with respect to the higher thermal shock resistance. The formulation and properties of zircon-phosphoric acid investment materials such as water/powder ratio, fluidity of slurry, setting time, setting expansion, thermal expansion, thermal analysis, green and fired compressive strength were measured. Formulation of zircon slurry for coating was zircon flower #600 30%, zircon flower #350 10%, and zircon sand CP 60%, and that for sanding was zircon flower #200. The mixing liquid was 15% phosphoric acid and liquid/powder ratio was 0.1. The slurry using phosphoric acid had good fluidity and good workability. The 24-hour green strength was 1 MPa, fired strength was 10 MPa, 24-hour setting expansion was -0.04% and the thermal expansion at 1000 degrees C was 0.31%. Immediately after coating with zircon slurry, the coating layer was dried, sintered and dewaxed by thermal shock. The thermal shock consisted of the following four-step manipulations. The first is hot air drying (50 degrees C, 5 minutes), the second is heat shock (900 degrees C, 3 seconds), the third is redrying (220 degrees C, 3 minutes) and the fourth is dewaxing (550 degrees C, 3 minutes). Small casting of pure titanium and K-metal could be done successfully by the quick casting method using the zircon-phosphoric acid investments. It was found that the total expansion of the secondary investments influenced the casting adapatability.","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":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13289580","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

[Gypsum temporary filling material containing HY-agent. The effects of the HY-agent on the dentin]. 石膏临时填充材料含hy -剂。hy -剂对牙本质的影响[j]。

Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01

N Ishizuka, T Yamaga

引用次数: 0