Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials最新文献_第10页

[Studies on the thinning of the upper acrylic resin complete denture with the reinforced palate. (Part 2) Influence of the different palate forms on the thin plate dentures (author's transl)]. 强化上颚丙烯酸树脂全口义齿减薄的研究。(第二部分)不同上颚形态对薄钢板义齿的影响[作者简介]。

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

Y Takayama

{"title":"[Studies on the thinning of the upper acrylic resin complete denture with the reinforced palate. (Part 2) Influence of the different palate forms on the thin plate dentures (author's transl)].","authors":"Y Takayama","doi":"","DOIUrl":"","url":null,"abstract":"In this paper, succeeding the study of the part 1 on the thinning of the upper acrylic resin complete denture with the reinforced palate, it was investigated to keep the same stiffness and strength as the normal resin dentures, and to make the patient comfortable. Besides, many different palate forms exist in the patient's mouth in clinical cases, and so, influence of these forms on the thin plate dentures comes into question. Therefore, 3 types of the palate forms (the standard shape, the extremely large torus and the generally shallow shape) were established, and then the flexural stiffness and strength, and the deformation of the denture bases were scrutinized in this paper. The results obtained in this investigation are as follows: 1) The maxillary torus with sheer bulk had little influence on the flexural stiffness and strength. But, about the generally shallow-shaped denture bases, the mechanical properties dropped a little as compared the normal resin denture bases. The reinforced thin denture bases of which thickness was 60% of the normal one, showed the excellent mechanical properties in spite of the difference of the palate forms. 2) In the upper complete denture base, in spite of the palate forms, anteriority and posteriority of the one were deformed against the load direction around the frontal section through the bilateral canines, and the bilateral ridges of the one were deformed to the load direction around the midline of the denture base. The deformation was extremely decreased by not only the palate but also the whole of the denture base as the reinforced one.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"21 53","pages":"48-63"},"PeriodicalIF":0.0,"publicationDate":"1980-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17980199","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

[Changes in electrical capacitance of silicone rubber impression materials during setting process (author's transl)]. 【硅橡胶压印材料在定型过程中电容的变化(作者简介)】。

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

K Seito

引用次数: 0

[Studies on Pd base ternary alloys for dental amalgam. (Part 1) Effect of size and shape of particle on dimensional change and mechanical properties (author's transl)]. 牙科用银汞合金钯基三元合金的研究。(第1部分)颗粒尺寸和形状对尺寸变化和力学性能的影响[作者译]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1979-10-01

I Yasumura

{"title":"[Studies on Pd base ternary alloys for dental amalgam. (Part 1) Effect of size and shape of particle on dimensional change and mechanical properties (author's transl)].","authors":"I Yasumura","doi":"","DOIUrl":"","url":null,"abstract":"Although much efforts have been paid to improve the properties of silver-tin amalgam, some clinical problems are not resolved yet. Palladium alloys have good properties for dental material, and they react on mercury well. So they are considered to be good amalgam alloys. In this paper, palladium base ternary alloys are studied for dental amalgam. The effect of size and shape of particle on dimensional change, compressive strength and hardness is studied. Main results obtained are as follows. (1) The dimensional change of spherical particle amalgam is smaller than that of fine cut particle. The finer the particle size is, the smaller the dimensional change is both for spherical and fine cut particles. (2) The dimensional change of amalgam of 60 wt% Pd-40 wt% Ag alloy decreased by addition of Sn or Cu, and these values under 20 micrometer/cm by addition of more than 5 wt% Cu or 10 wt% Sn. (3) Compressive strength of Pd alloy amalgam scatter so widely that the effects of alloying element are not able to be evaluated. Both maximum compressive strengths are 22 kg/mm2 and 28 kg/mm2 for the alloys containing Cu and Sn respectively. (4) Vicker's hardness of palladium alloy amalgam increased by addition of Sn and ranged 80 approximately 120 for spherical amalgam, which is higher than that of commercial alloy. Significant difference is not found in Cu added alloys. (5) From the analysis by XMA, it is found that matrix is composed of one phase and there is compositional difference between center of matrix and near the particle. Silver is rich in the center of matrix and palladium is rich near the alloy particle. Cu and Sn are seemed to distribute uniformly.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"20 52","pages":"240-54"},"PeriodicalIF":0.0,"publicationDate":"1979-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11508866","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

[Mechanical and dimensional properties of thermosetting resins for crown (author's transl)]. [冠用热固性树脂的机械性能和尺寸性能[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1979-10-01

T Hirasawa, S Hirano, I Harashima, S Hirabayashi, R Mori

{"title":"[Mechanical and dimensional properties of thermosetting resins for crown (author's transl)].","authors":"T Hirasawa, S Hirano, I Harashima, S Hirabayashi, R Mori","doi":"","DOIUrl":"","url":null,"abstract":"The various mechanical and dimensional properties of seven thermosetting methacrylic resins for crown and one heat-curing methacrylic resin as the control were investigated. The obtained results were as follows. 1. The water sorption, namely amount of sorption water and linear expansion by water sorption of hydrophobic poly-bis-MEPP resins were 50 to 70% of that of the control. But hydrophilic poly-EDMA resins indicated the water sorption about 1 to 1.5 times as much as the control. And a poly-UDMA resin was also hydrophilic as poly-EDMA resins, indicated about 1.3 times as much as the control. 2. The properties of poly-bis-MEPP resins were more excellent than that of poly-EDMA resins especially in the wet condition, at least were equal. 3. A poly-UDMA resin contained so-called organic composite fillers, indicated more excellent properties than other resins on hardness, abrasion resistance, linear coefficient of thermal expansion, compressive strength and bending strength in the dry condition. But, in the wet condition, some of these properties of a poly-UDMA resin were approximately equal to those of other resins.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"20 52","pages":"209-16"},"PeriodicalIF":0.0,"publicationDate":"1979-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11509056","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 4-META on adhesive opaque resin. (Part 2) Improvement of adhesive stability (author's transl)]. [4-META在胶粘剂不透明树脂上的应用](第二部分)粘合剂稳定性的提高(作者简介)。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1979-10-01

T Tanaka, K Nagata, N Nakabayashi, E Masuhara

引用次数: 0

[Literature on dental engineering, 1978. (XX)]. 牙科工程文献，1978。(XX)]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1979-10-01

引用次数: 0

[A study of the ageing process in dental Ag-Pd-Cu-Au alloys by anisothermal annealing method (author's transl)]. [牙科用Ag-Pd-Cu-Au合金的不等温退火时效过程研究[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1979-10-01

K Hisatsune, M Ohta, M Yamane

引用次数: 0

[Retention of crowns as affected by film thickness of zinc phosphate cement and taper angle of crowns (author's transl)]. [磷酸锌胶结膜厚度和冠锥角对冠固位的影响[作者译]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1979-10-01

H Otani, T Goto

{"title":"[Retention of crowns as affected by film thickness of zinc phosphate cement and taper angle of crowns (author's transl)].","authors":"H Otani, T Goto","doi":"","DOIUrl":"","url":null,"abstract":"Dependence of the retention of crowns at their axial wall on the film thickness of zinc phosphate cement and the taper angle was investigated. Stainless steel dies, composed of a preparation and an occlusally perforated crown the taper angle of which was 2.9, 5.7, 8.5 and 11.3 degrees respectively (Fig. 1, (a) and (b)), were cemented within three min. after the start of mix with a Shofu Micro Cement having a powder-liquid ratio of 1.5 g/0.5 cc. The thickness of the cement layer at the axial wall was regulated to a given value between 9 and 55 mu through the use of a discrepancy measurer. A Shimazu Autograph tensile test machine was employed to measure 48-hr retention (kg/cm2). The retention of the crowns was strongly dependent on the cement film thickness and the taper angle when the film thickness was below a critical value (15 mu in this experiment), but not when the film thickness was above this value (Fig. 3). This may be explained by the term of mechanical interlocking of either of the unreacted powder grains and the matrix phase in the luting cement, as schematically drawn in Fig. 6. The same findings were more evidently appeared on the semilogarythmic diagram in Fig. 4. In this diagram, the critical value was shown as intersection of two straight lines which could be drawn through all the measurements for four taper angles, using the least squares.","PeriodicalId":76541,"journal":{"name":"Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials","volume":"20 52","pages":"217-20"},"PeriodicalIF":0.0,"publicationDate":"1979-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11509057","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 Au-Ag-Pd-Cu alloys. (Part 1) Effects of Au component on some properties of alloys (author's transl)]. Au-Ag-Pd-Cu合金的研究。(第一部分)Au组分对合金某些性能的影响[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1979-10-01

K Okazaki

引用次数: 0

[Preparation of hard crown and bridge resin without PMMA powder (II) (author's transl)]. [无PMMA粉末硬冠桥树脂的制备(II)[作者简介]。

Shika rikogaku zasshi. Journal of the Japan Society for Dental Apparatus and Materials Pub Date : 1979-07-01

K Nagata, S Suzuki, N Nakabayashi, E Masuhara

引用次数: 0