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

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[Reactions at the nonprecious metal-ceramic interface during porcelain firing. (3) A commercial alloy forming much Cr oxide during firing]. [陶瓷烧制过程中非贵金属-陶瓷界面的反应。](3)一种在烧制过程中形成大量氧化铬的商业合金。
Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01
K Watanabe, S Okawa, O Miyakawa, S Nakano, N Shiokawa, M Kobayashi
{"title":"[Reactions at the nonprecious metal-ceramic interface during porcelain firing. (3) A commercial alloy forming much Cr oxide during firing].","authors":"K Watanabe,&nbsp;S Okawa,&nbsp;O Miyakawa,&nbsp;S Nakano,&nbsp;N Shiokawa,&nbsp;M Kobayashi","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>To examine the interface reaction between porcelain and a commercial Ni-Cr dental alloy (containing higher Cr and Mo) during porcelain firing, electron probe microanalyzer (EPMA) and X-ray diffraction have been used to characterize the interface which has emerged by means of selective dissolution of the alloy caused by a bromine-methanol solution. Much Cr oxide was formed at the early stage of firing, and remained in the reaction layer even if the holding time at 960 degrees C was up to 8 minutes. As a result, many Cr atoms diffused into the porcelain layer, most of which was found to form oxides through X-ray diffraction. Moreover, the porcelain layer nearest to the oxide layer was deduced to be modified seriously.</p>","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":"13290055","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
[Safety of restorative composite resins introduced in domestic and foreign literature. Report of the Committee on Inquisitional Research on Dental Materials, Instruments and Equipment]. 国内外文献对修复性复合树脂的安全性进行了介绍。牙科材料、仪器及设备调查研究委员会的报告]。
Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01
{"title":"[Safety of restorative composite resins introduced in domestic and foreign literature. Report of the Committee on Inquisitional Research on Dental Materials, Instruments and Equipment].","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","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":"13290059","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. Chronological change in mechanical properties of matrix resin immersed in MeOH]. 【可见光固化树脂】基质树脂浸泡在MeOH中力学性能的时间变化[j]。
Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01
N Ishibe
{"title":"[Visible light cured resin. Chronological change in mechanical properties of matrix resin immersed in MeOH].","authors":"N Ishibe","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Monomer composition was examined to improve durability of matrix resin of visible light cured composite resin. As a monomer, five kinds of cyclophosphazene monomers, two kinds of commercial monomers and a mixture of commercial monomers were prepared to the visible light cured resins. The mechanical properties of these set products were examined with time after immersion in MeOH, an aging accelerating solvent. Compressive strength of the resins using cyclophosphazene monomers tended to decrease with time, but it increased in accordance with the increase of the number of polymerization group. Compressive strength of the resins using commercial monomers tended to decrease, but that using the BMPEPP monomer tended to increase with time. Yield point of the resins with the cyclophosphazene monomer 4 PN-(EMA)8 tended to increase with the time but that of the resins with other cases monomers decreased. The yield point of all three resins made using commercial monomers tended to decrease with time, but the rate of decrease was small for BMPEPP monomer. Compressive elastic modulus of the resins using cyclophosphazene monomers tended to increase with time when the number of polymerization group was 6-8, while it decreased when the number was 4-5. When commercial monomers were used, it tended to decrease with time, but the rate of decrease was small for the BMPEPP monomer. Transverse strength of the resins using cyclophosphazene monomers showed a tendency to decrease with time. When a commercial monomer was used, cracks appeared in the Bis-GMA+Tri-EDMA monomer after 7 days, and with the other two monomers, the transverse strength tended to decrease with time, though the rate of decrease was small for the BMPEPP monomer. Transverse elastic modulus tended to decrease with time, but the rate of decrease was small for the BMPEPP monomer.</p>","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":"13290173","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
[Durability of commercial composite resin. Chronological change in transverse strength and transverse elastic modulus of composite resin immersed in MeOH]. 商用复合树脂的耐久性。复合树脂浸泡在MeOH中横向强度和横向弹性模量的时间变化[j]。
Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01
M Anzai
{"title":"[Durability of commercial composite resin. Chronological change in transverse strength and transverse elastic modulus of composite resin immersed in MeOH].","authors":"M Anzai","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The durability of visible light-cured composite resin was examined. Five kinds of commercial redox type composite resin and 7 kinds of visible light-cured composite resin were used and their base monomers were analyzed by HPLC. After the set products were immersed in MeOH, transverse strength and transverse elastic modulus were measured. Furthermore, the MeOH sorption, solubility in MeOH and main soluble component were examined. The main component of the base monomer in all 5 kinds of redox type was Bis-GMA. Seven kinds of visible light-cured composite resin consisted of 4 kinds of Bis-GMA (including BMPEPP) and 3 kinds of UDMA. Both cases of redox type and visible light-cured type of composite resin, when they were immersed in MeOH, transverse strength and transverse elastic modulus decreased. In the case of redox type (Clearfil posterior new bond), the decrease of transverse strength and transverse elastic modulus was small, that is, its base monomer was Bis-GMA, and large quantities of hybrid type filler were mixed. In the case of redox type, transverse strength and transverse elastic modulus showed a tendency to decrease with the increase of MeOH sorption. Solubility of 12 kinds of these composite resins was 0.25-4.78% and its main component in Pyrofil light bond A was BMPEPP, the residual were coincident with the main component of base monomer.</p>","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":"13305687","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
[Fracture toughness of human enamel irradiated by CO2 laser]. CO2激光辐照人牙釉质断裂韧性研究。
Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01
K Okazaki, F Nishimura
{"title":"[Fracture toughness of human enamel irradiated by CO2 laser].","authors":"K Okazaki,&nbsp;F Nishimura","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The fracture toughness (KIC) of human enamel irradiated by CO2 laser was examined by means of indentation microfracture method (IM method). The irradiation of laser from 1.5 watt (16 J/cm2) to 12.3 watt (133 J/cm2) was applied to enamel for 0.2 s, and the diamond cone of micro vickers hardness tester was pressed down by the 2.45 N (250 gf) under ordinary circumstances. At the irradiated spot, KIC was 0.24-0.86 MPam1/2 and Hv was 3.6 x 10(3)-4.3 x 10(3)MPa (370-440). At the non-irradiated spot, KIC was 0.83-0.9 MPam1/2 and Hv was 3.9 x 10(3)-4.3 x 10(3)MPa (400-440). A decreasing tendency of KIC was seen in all irradiated spots. The marked decrease of KIC started at the irradiation of 4.4 watt (47 J/cm2) and the rate of decrease was 22%, and 54% when exposed to the irradiation of 5.7 watt (61 J/cm2). The rate of the lowering of the KIC of 0.05 seconds' irradiation x 4 times was less than that of 0.2 s x 1 time, while cumulative total irradiation energy was equal. The measurement of KIC by the low force of 0.98 N (100 gf) seemed to be possible when KIC was 0.41 MPam1/2 and less.</p>","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":"13290058","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
[Angle reproducibility and surface roughness of stone casts obtained from combined agar-alginate impressions]. [从组合的琼脂-海藻酸盐印痕中获得的石模的角度再现性和表面粗糙度]。
Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01
T Ohta
{"title":"[Angle reproducibility and surface roughness of stone casts obtained from combined agar-alginate impressions].","authors":"T Ohta","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Angle reproducibility and surface roughness were compared among stone casts obtained from two agar-alginate impression methods; 1) conventional method in which an alginate mix was applied before gelation of agar, and 2) improved method in which an alginate mix was applied to gelled agar. Impressions of the rectangular parallel piped metal mold with a high accurate point angle was taken according to the above methods, and stone casts were obtained. Enlarged images of the angles of the casts were projected with an optical projector, and the defects of the point angle were traced. The area, the length and the circular-degree coefficient of the defects were determined using an image analysis system. The surface roughness of the stone casts was also measured. The stone casts prepared by the improved agar-alginate method had better angle reproducibility and the same surface roughness as that prepared by the conventional method.</p>","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":"13290172","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
[A development of FRP frame for crown and bridge resin. (2) Rigidity and adaptability of FRP frame]. 玻璃钢冠架和桥树脂的研制。(2) FRP框架的刚度和适应性。
Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-05-01
H Kimura, F Teraoka
{"title":"[A development of FRP frame for crown and bridge resin. (2) Rigidity and adaptability of FRP frame].","authors":"H Kimura,&nbsp;F Teraoka","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Retainer and pontic of FRP frame for crown and bridge resin were constructed with two different prepregs, used glass cloth and roving as reinforcement. Rigidity and adaptability of the FRP frame and bonding strength of jointing of retainer and pontic were investigated. The glass content was about 50 wt% for both kinds of prepregs. Bonding strength and modulus of FRP plate reinforced with glass roving were about 1.5 times larger than that of the FRP plate reinforced with glass cloth. Bonding strength of FRP specimen constructed by curing the prepreg put on the FRP plate was about 3 kgf/mm2. However, the bonding strength of specimen constructed by curing simultaneously the two prepregs was about 12 kgf/mm2. Though discrepancy of the FRP frame to stone cast of abutment tooth was proportional to the length of pontic, that of the FRP frame with a 50 mm pontic was less than 0.05 mm.</p>","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":"13290176","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
[The effect of filler content on properties of polyaddition-type silicone impression material]. [填料含量对聚加成型硅酮压印材料性能的影响]。
Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01
M Hosotani, N Katakura, M Kawakami, K Iijima, H Honma
{"title":"[The effect of filler content on properties of polyaddition-type silicone impression material].","authors":"M Hosotani,&nbsp;N Katakura,&nbsp;M Kawakami,&nbsp;K Iijima,&nbsp;H Honma","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The effect of quartz filler content on viscosity, dynamic viscoelasticity and tensile stress of polyaddition-type silicone impression materials were investigated. A hydrogen polydimethylsiloxane (H-silicone) and two vinyl polydimethylsiloxane (V-silicone) silicone prepolymers were prepared. Quartz fillers were mixed to them at contents between 0 and 50% by weight. The viscosity of these rubber compounds and mechanical properties of set materials were measured by a cone and plate viscometer, the dynamic shear test and the tension test, respectively. Viscosity eta storage modulus G' and tensile stress sigma increased with the amount of filler increase. G' and sigma were decreased by use of a V-silicone prepolymer which had a high average molecular weight and the material was more flexible. This suggests that the characteristics of the silicone prepolymer greatly affect the mechanical properties of the impression materials. Therefore, the appropriate molecular design for silicone prepolymer and reasonable filler content should be considered to make impression materials that have suitable properties for clinical use.</p>","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":"13289579","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
[Effect of various pretreatments for dentin bonding on dentin permeability]. [牙本质结合预处理对牙本质渗透性的影响]。
Shika zairyo, kikai = Journal of the Japanese Society for Dental Materials and Devices Pub Date : 1990-03-01
J Tagami, J Sugizaki, H Hosoda
{"title":"[Effect of various pretreatments for dentin bonding on dentin permeability].","authors":"J Tagami,&nbsp;J Sugizaki,&nbsp;H Hosoda","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Pretreatment of the dentinal surface with acidic solution is now considered to be necessary to obtain strong bonding between dentin and resin materials. Effects of various surface treatments for dentin bonding on dentinal smear removal have been reported by SEM observation. In this study, changes of dentin permeability after the surface treatments were measured using Pashley's technique. Forty-second treatments with either phosphoric acid gel, aqueous phosphoric acid, 10-3 solution or aqueous 10-20 Ca solution (10% citric acid containing 20% CaCl2) produced greater increases in dentin permeability compared with the treatments using either 10-20 Ca gel, Tenure Conditioner, Scotchprep or Gluma 2 for 40 seconds. Treatments with primers including adhesive monomers such as Scotchprep and Mirage Conditioner also increased the dentin permeability by removal of the smear layers and smear plugs. Application of a bonding agent (Clearfil Photobond) for 1 minute did not remove the smear plugs and the dentin permeability remained the same as before the treatment. The changes in dentin permeability were not predictable by SEM observation in some cases.</p>","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":"13290343","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 properties and cure depth of UDMA-based composite resins]. [udma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 : 1990-03-01
M Kawaguchi, T Fukushima, T Horibe
{"title":"[Mechanical properties and cure depth of UDMA-based composite resins].","authors":"M Kawaguchi,&nbsp;T Fukushima,&nbsp;T Horibe","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Mechanical properties and cure depth of visible light-cured composite resins based on six types of UDMA (IP-HEMA, IP-HPMA, XY-HPMA, MC-HPMA, UEDMA and UPDMA) monomers were investigated. Under wet conditions, the mechanical properties of the composite resins based on aliphatic UDMA (UEDMA and UPDMA) monomers were inferior to those based on the other UDMA monomers containing aromatic or cyclohexane rings in their chemical structures. The cure depth for these UDMA-based composite resins increased with increasing irradiation time. The composite resin based on the XY-HPMA monomer showed a cure depth and transmission coefficient superior to the other composite resins.</p>","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":"13290346","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
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