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Study on Acoustic Emission Characteristics of Deformation Damage Process of Zirconia Ceramics
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作者 Qingchuan Fu Yushu Lai 《Journal of Materials Science and Chemical Engineering》 2024年第2期61-72,共12页
Zirconia ceramics have become increasingly widely used in recent years and are favored by relevant enterprises. From the traditional dental field to aerospace, parts manufacturing has been used, but there is limited r... Zirconia ceramics have become increasingly widely used in recent years and are favored by relevant enterprises. From the traditional dental field to aerospace, parts manufacturing has been used, but there is limited research on the deformation and damage process of zirconia ceramics. This article analyzes the acoustic emission characteristics of each stage of ceramic damage from the perspective of acoustic emission, and explores its deformation process characteristics from multiple perspectives such as time domain, frequency, and EWT modal analysis. It is concluded that zirconia ceramics exhibit higher brittleness and acoustic emission strength than alumina ceramics, and when approaching the fracture, it tends to generate lower frequency acoustic emission signals. 展开更多
关键词 zirconia Ceramics Acoustic Emission Monitoring Crack Damage
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Progress on grain growth dynamics in sintering of nano-powders 被引量:2
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作者 LIU Chunjing WANG Xin JIANG Yanfei WANG Yongming HAO Shunli 《Rare Metals》 SCIE EI CAS CSCD 2006年第z1期471-475,共5页
Nanostructured materials, characterized by an ultrafine grain size, have stimulated much research interest by virtue of their unusual mechanical, electrical, optical, and magnetic properties. In this paper, the sinter... Nanostructured materials, characterized by an ultrafine grain size, have stimulated much research interest by virtue of their unusual mechanical, electrical, optical, and magnetic properties. In this paper, the sintering process of nano-powders were reviewed, to which sintering of the traditional materials compared. The microstructural development, i.e., grain growth and densification during sintering as well as the mechanism of crystal surface diffusion and boundary migration were analyzed, and the dynamic models on sintering process were summarized by the relationship of grain growth and pores size, interface diffusion, densification rate, and sintering temperature. Finally, the research tendency of this major on the basis of above models was discussed. 展开更多
关键词 nano-powders SINTERING grain boundary grain growth DYNAMICS
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ITO nano-powders prepared by microwave-assisted co-precipitation in aqueous phase 被引量:2
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作者 朱协彬 姜涛 +1 位作者 邱冠周 黄伯云 《中国有色金属学会会刊:英文版》 CSCD 2009年第S3期752-756,共5页
By using microwave-assisted co-precipitation in aqueous phase, adding surface activation agent PEG-6000 into the mixture of InCl3 solution and SnCl4 solution, and dropping the ammonia solution with the density (volume... By using microwave-assisted co-precipitation in aqueous phase, adding surface activation agent PEG-6000 into the mixture of InCl3 solution and SnCl4 solution, and dropping the ammonia solution with the density (volume ratio) of 1-0 to 1-4, ITO precursor was prepared at different reaction system temperatures of 35 ℃-85 ℃, then ITO nano-powder was obtained after it was calcinated at 800 ℃ for 1 h. The morphology of ITO nano-powder was characterized by SEM and its electrical conductivity was determined by conductivity meter. The effects of different temperatures and ammonia concentration in microwave-assisted reaction system on its morphology and electric conductivity were discussed. The experimental results indicate that with the dilution of the ammonia solution or the rise of reacting system temperature, the morphology of ITO particles is transformed from spherical to rod-like one with the decline of its electric conductivity. And the electric conductivity of ITO nano-powders with spherical morphology is higher than that of ITO nano-powders with rod-like morphology. 展开更多
关键词 ITO nano-powdER surface activation agent PEG-6000 microwave assistance CO-PRECIPITATION aqueous phase
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Effects of Yb ^(3+)-Doping on Phase Transformation and Photocatalytic Activities of TiO_2 Nano-Powders
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作者 姜洪泉 王鹏 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第S1期58-64,共7页
Yb 3+-doped TiO_2 composite nano-particles were prepared by the acid-catalyzed sol-gel method using Ti(OC_4H_9)_4 and Yb(NO_3)_3 as precursors. The effects of the amount of Yb 3+ doping and calcination temperature on ... Yb 3+-doped TiO_2 composite nano-particles were prepared by the acid-catalyzed sol-gel method using Ti(OC_4H_9)_4 and Yb(NO_3)_3 as precursors. The effects of the amount of Yb 3+ doping and calcination temperature on the phase transformation, crystallite size, surface texture of the nanopowders were investigated by XRD and BET specific surface area. Their photocatalytic activities were evaluated using the photocatalytic degradation of methylene blue in aqueous solution as a probe reaction. At the interface, titanium ions substitute for ytterbium ions in the lattice of Yb_2O_3 to form Ti-O-Yb bonds, which cause distortion and inhibit the anatase to rutile phase transformation in TiO_2. The results indicate that Yb 3+-doping can enhance the photocatalytic activity of TiO_2 nano-powders as compared with pure TiO_2. 0.125%(mass fraction) Yb 3+ doped TiO_2 nano-powders calcined at 600 ℃ for 2 h show the highest photocatalytic activity. The increase in photoactivity is due to the effects of the factors such as crystal phase, crystallite size, surface chemical property, surface density of OH groups, and surface texture properties of the TiO_2 nano-powders. 展开更多
关键词 TITANIA Yb 3+-doping nano-powders phase transformation photocatalytic activity
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Influence of current injection ways on efficiency and size of powders in preparation of nano-powders with electrical explosion
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作者 张爱华 吴龙 +2 位作者 杨富龙 周爱武 朱亮 《China Welding》 EI CAS 2014年第1期51-58,共8页
Wire electrical explosion may result in the existence of micro-sized large particles in powders while current injection ways may influence the size and content of micro-sized large particles. Therefore, two kinds of e... Wire electrical explosion may result in the existence of micro-sized large particles in powders while current injection ways may influence the size and content of micro-sized large particles. Therefore, two kinds of electrical explosion devices with different electrodes by gas discharge were designed in this paper. The pole-board electrodes and the cone electrodes were used respectively for studying copper wire electrical explosion process. The current and voltage data were measured with the Rogowski coil and high voltage probe. The results show that the pulverizing process of electrical explosion is more efficient when the wire electrode current density injected into the cone electrodes is approximately twice as much as the pole-board electrodes. The content of micro-sized large particles is the least among the products of the electrical explosion, when the total deposition energy of the wire prior to vaporization stage is 2. 5 times larger than that of the theoretical value of the completed vaporization. 展开更多
关键词 nano-powders wire electrical explosion gas discharge energy density
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Replacement of Unesthetic Posterior Metal Crowns with Monolithic Zirconia Crowns: A Case Report
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作者 Mitsunori Uno Hajime Ishigami 《Open Journal of Stomatology》 2023年第10期334-341,共8页
Advances in metal-free materials and the popularization of Computer-Aided Design and Manufacturing (CAD/CAM) have led to the wide clinical use of all-ceramic crowns for esthetic restorations. A 72-year-old woman prese... Advances in metal-free materials and the popularization of Computer-Aided Design and Manufacturing (CAD/CAM) have led to the wide clinical use of all-ceramic crowns for esthetic restorations. A 72-year-old woman presented to our hospital with unesthetic restorations on the right upper and lower posterior teeth. Intraoral examination revealed poorly fitting metal crown margins. Defective prostheses were removed, and provisional restorations were provided to stabilize the mandibular position. Optical impressions and the maxillomandibular relationship were recorded using an intraoral scanner, and monolithic zirconia crowns were fabricated using CAD/CAM technology for complete veneer crown restorative treatment. Occlusal examination revealed an improvement in occlusal force distribution at initial examination (right side: 33.5%, left side: 66.5%) after placement of the zirconia crowns (right side: 54.9%, left side: 45.1%). Occlusal force and occlusal force distribution area also showed an increasing trend. The Oral Health Impact Profile short form (OHIP-14) score decreased from 7 points at initial examination to 0 points after prosthodontic treatment. Appropriate diagnosis and treatment planning contributed to the increased occlusal force and balanced occlusal force distribution. Therefore, the present case indicates the potential of monolithic zirconia crowns to achieve both esthetic and stable functional outcomes. 展开更多
关键词 Monolithic zirconia Crown Intraoral Scanner Computer-Aided Design and Manufacturing
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Nacre-inspired Zirconia/Carbon Nanocomposites with High Strength and Toughness
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作者 刘泽星 PING Hang 王堃 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第4期771-777,共7页
Inspired by structures of natural shells,zirconia-carbon nanocomposites were obtained by using natural chitin from shrimp shells as templates via the sol-gel route in this study.Chitin was dispersed in the water and c... Inspired by structures of natural shells,zirconia-carbon nanocomposites were obtained by using natural chitin from shrimp shells as templates via the sol-gel route in this study.Chitin was dispersed in the water and chelated with the zirconia precursors by amidogen.After a heat treatment for carbonization,nacre-like structures of carbon-zirconia nanocomposites were successfully synthesized.Due to the toughening mechanism of tetragonal zirconia,the mechanical properties of carbon-zirconia composites are further improved.The as-received zirconia/carbon nanocomposite with best mechanical property has a hardness of 5.88GPa and an elastic modulus of 80.6 GPa,which is even stronger than natural shells.This work might facilitate a versatile platform for developing green nanocomposites with reasonably good mechanical properties. 展开更多
关键词 zirconia/carbon nanocomposites SOL-GEL CHELATION hardness elastic modulus
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Machine learning potential for Ab Initio phase transitions of zirconia
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作者 Yuanpeng Deng Chong Wang +1 位作者 Xiang Xu Hui Li 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2023年第6期408-414,共7页
Zirconia has been extensively used in aerospace,military,biomedical and industrial fields due to its unusual combination of high mechanical,electrical and thermal properties.However,the fundamental and critical phase ... Zirconia has been extensively used in aerospace,military,biomedical and industrial fields due to its unusual combination of high mechanical,electrical and thermal properties.However,the fundamental and critical phase transition process of zirconia has not been well studied because of its difficult first-order phase transition with formidable energy barrier.Here,we generated a machine learning interatomic potential with ab initio accuracy to discover the mechanism behind all kinds of phase transition of zirconia at ambient pressure.The machine learning potential precisely characterized atomic interactions among all zirconia allotropes and liquid zirconia in a wide temperature range.We realized the challenging reversible first-order monoclinic-tetragonal and cubicliquid phase transition processes with enhanced sampling techniques.From the thermodynamic information,we gave a better understanding of the thermal hysteresis phenomenon in martensitic monoclinic-tetragonal transition.The phase diagram of zirconia from our machine learning potential based molecular dynamics simulations corresponded well with experimental results. 展开更多
关键词 Machine learning Molecular dynamics Enhanced sampling Phase transition zirconia
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Effect of Zirconia Corundum Addition on Properties of Chrome Corundum Castables
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作者 GUO Peng CHEN Lu +2 位作者 YU Tongshu ZHANG Hui WANG Dongdong 《China's Refractories》 CAS 2023年第2期41-44,共4页
In order to investigate the effect of zirconia corundum on the preparation of chrome corundum castables,samples were prepared using tabular corundum,white fused corundum,active alumina micropowder,chromium oxide micro... In order to investigate the effect of zirconia corundum on the preparation of chrome corundum castables,samples were prepared using tabular corundum,white fused corundum,active alumina micropowder,chromium oxide micropowder and fused ziconia corundum particles as the main raw materials,and pure calcium aluminate cement as the binder.The effects of the fused zirconia corundum particles addition(1-0.5 mm,0,4.5%,9%,and 18%,by mass)on the linear change rate,the apparent porosity,the cold modulus of rupture,and the thermal shock resistance of chrome corundum castables were studied,and the microstructure of the samples was analyzed.The results show that:(1)with the zirconia corundum addition increasing,the permanent linear change on heating of the samples gradually increases,the apparent porosity gradually increases,the cold modulus of rupture gradually decreases,and the thermal shock resistance gradually increases;(2)according to SEM,it can be found that the phase transformation of ZrO2 after heat treatment leads to a large number of microcracks in the material.On one hand,the cold modulus of rupture of the material is reduced;on the other hand,the thermal shock resistance of the material is improved. 展开更多
关键词 fused zirconia corundum-chrome corundum CASTABLE thermal shock resistance MICROCRACK
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Preparation and Mechanical Properties of Zirconia Ceramics Doped with Different Y_(2)O_(3)Contents
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作者 SONG Yanwei ZHAO Xiaoqing +3 位作者 WANG Aiyang XIONG Yan DONG Yanling WANG Weimin 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第6期1287-1292,共6页
The sintering behavior and mechanical properties of zirconia doped with 2.0mol%-3.0mol%Y_(2)O_(3)were studied by pressure-less sintering.The experimental results show that the densification temperature of zirconia cer... The sintering behavior and mechanical properties of zirconia doped with 2.0mol%-3.0mol%Y_(2)O_(3)were studied by pressure-less sintering.The experimental results show that the densification temperature of zirconia ceramics increases gradually with the decrease of Y_(2)O_(3)doping content by which decreases the sintering driving force due to the lower oxygen vacancy concentration of the systems.Furthermore,the bending strength and fracture toughness of the prepared zirconia ceramics increase with the decrease of Y_(2)O_(3)doping content.It can be attributed to the fact that the phase stability of tetragonal zirconia decreases with the decrease of Y_(2)O_(3)doping content,which is easier to induce"phase transformation toughening"and dissipate impact energy.The relative density,bending strength and fracture toughness of 2.0 mol%Y_(2)O_(3)doped zirconia ceramics(2.0Y-ZrO_(2))sintered at 1525℃are 99.00%,1256.65±20.82 MPa and 9.85±0.13 MPa·m^(1/2),respectively. 展开更多
关键词 yttria-stabilized tetragonal zirconia polycrystal(Y-TZP)ceramics sintering behaviors mechanical properties
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二氧化锆全瓷冠修复前牙的效果及对局部炎症状态的影响 被引量:1
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作者 蒋俊豪 张侬 +1 位作者 杨雅 李娟 《中国医学创新》 CAS 2024年第3期65-68,共4页
目的:探究及观察二氧化锆全瓷冠修复前牙的效果及对局部炎症状态的影响。方法:选取2019年1月—2021年1月深圳市龙岗区妇幼保健院口腔科的100例需进行前牙冠修复的患者为研究对象,根据随机数字表法分为对照组(镍铬合金烤瓷冠组)和观察组... 目的:探究及观察二氧化锆全瓷冠修复前牙的效果及对局部炎症状态的影响。方法:选取2019年1月—2021年1月深圳市龙岗区妇幼保健院口腔科的100例需进行前牙冠修复的患者为研究对象,根据随机数字表法分为对照组(镍铬合金烤瓷冠组)和观察组(二氧化锆全瓷冠组),每组50例。比较两组的修复效果(颜色匹配度、完整度及边缘密合度)、不良情况发生率、局部炎症状态指标[龈沟液炎症因子白介素-1β(IL-1β)及白介素-6(IL-6)、炎症介质前列腺素E2(PGE2)]、炎症趋化因子[调节活化正常T细胞表达和分泌因子(RANTES)]、患者满意度。结果:观察组的颜色匹配度、完整度及边缘密合度均显著优于对照组,不良情况发生率显著低于对照组,差异均有统计学意义(P<0.05)。治疗前,两组的局部炎症状态指标比较,差异均无统计学意义(P>0.05);治疗后3、6个月,观察组的局部炎症状态指标均显著优于对照组,患者满意度显著高于对照组,差异均有统计学意义(P<0.05)。结论:二氧化锆全瓷冠修复前牙的效果较好,且可有效控制患者的局部炎症状态,更受患者认可。 展开更多
关键词 二氧化锆全瓷冠 前牙 局部炎症状态
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极薄氧化锆贴面的研究进展 被引量:1
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作者 孙玉春 沈妍汝 +1 位作者 陈虎 王相 《口腔颌面修复学杂志》 2024年第1期1-5,共5页
全瓷贴面修复是改善牙齿形态、色泽和排列的常用方法。随着口腔陶瓷材料和修复体加工方式的不断发展,微创/无创贴面修复是医生和患者对牙齿修复提出的共同要求。本文回顾了全瓷贴面的发展历程和应用现状,对极薄氧化锆贴面相关的新材料... 全瓷贴面修复是改善牙齿形态、色泽和排列的常用方法。随着口腔陶瓷材料和修复体加工方式的不断发展,微创/无创贴面修复是医生和患者对牙齿修复提出的共同要求。本文回顾了全瓷贴面的发展历程和应用现状,对极薄氧化锆贴面相关的新材料、新工艺做一介绍,并对其技术前景和临床效果进行展望。 展开更多
关键词 极薄贴面 氧化锆 面投影微立体光固化 微创/无创修复技术
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二氧化锆髓腔固位冠修复低牙合龈距磨牙的临床效果 被引量:1
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作者 章雯 庞敏 +1 位作者 张海帆 杜劲英 《转化医学杂志》 2024年第2期235-238,共4页
目的 评估二氧化锆髓腔固位冠修复低牙合龈距磨牙的临床效果。方法 对2020年1月—2022年1月就诊的46例(50颗)根管治疗后的低牙合龈距磨牙采用二氧化锆髓腔固位冠修复。分别于修复完成后1、6、12个月复查,对修复体完整性、邻接紧密度、... 目的 评估二氧化锆髓腔固位冠修复低牙合龈距磨牙的临床效果。方法 对2020年1月—2022年1月就诊的46例(50颗)根管治疗后的低牙合龈距磨牙采用二氧化锆髓腔固位冠修复。分别于修复完成后1、6、12个月复查,对修复体完整性、邻接紧密度、边缘密合情况、基牙情况、牙周状况及修复体松动或脱落情况进行评估。结果 1个月复查,50颗磨牙修复后各项评价指标均达到临床可接受水平。6个月复查,6颗患牙牙龈轻度充血,修复体及基牙牙体无异常。12个月复查,仅2颗患牙修复体邻接关系欠佳;2颗患牙牙龈轻度充血,未发现修复体及基牙牙体问题。结论 对根管治疗后的低牙合龈距磨牙采用二氧化锆髓腔固位冠修复既可保护牙体避免折裂,又可提升黏结效果且兼具美观,临床应用效果良好。 展开更多
关键词 二氧化锆 髓腔固位冠 低牙合龈距磨牙 根管治疗 修复 整体外形 邻接紧密度
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氧化锆和氧化镧共掺杂对堇青石多孔陶瓷性能的影响
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作者 张会 柴倩 +3 位作者 张红 王艺兴 郝晨曦 王星雨 《耐火材料》 CAS 北大核心 2024年第2期99-103,共5页
为实现堇青石相的低温合成,采用粒度为≤0.044 mm的煅烧高岭土、粒度为≤0.074 mm的烧结镁砂和d_(50)=2.6μm的二氧化硅微粉为主要原料,以分析纯的氧化锆和氧化镧为烧结助剂,以聚乙烯醇PVA溶液为结合剂,按照堇青石理论配比,在60 MPa压... 为实现堇青石相的低温合成,采用粒度为≤0.044 mm的煅烧高岭土、粒度为≤0.074 mm的烧结镁砂和d_(50)=2.6μm的二氧化硅微粉为主要原料,以分析纯的氧化锆和氧化镧为烧结助剂,以聚乙烯醇PVA溶液为结合剂,按照堇青石理论配比,在60 MPa压力下成型为φ30 mm×30 mm的试样,干燥、煅烧后制备了堇青石多孔陶瓷。研究了烧结助剂氧化锆添加量(外加质量分数为0、8%)、氧化镧添加量(外加质量分数分别为0、0.2%、0.4%、0.6%、0.8%)和煅烧温度(分别为1200、1250及1300℃)对堇青石多孔陶瓷常温物理性能、物相组成和显微结构的影响。结果表明:1)在1300℃下,当试样中引入8%(w)氧化锆和0.6%(w)氧化镧时,试样的物理性能较优;2)氧化锆和氧化镧共掺杂可在显气孔率变化较小的情况下,提高试样的力学性能,且促进堇青石相的生成;3)氧化锆和氧化镧共掺杂可一定程度上降低堇青石相的合成温度,提高试样的综合性能。 展开更多
关键词 堇青石 多孔陶瓷 烧结助剂 氧化锆 氧化镧
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皮秒激光不同图案化处理氧化锆陶瓷对其粘接性能的影响
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作者 周巧珍 陈锐 +4 位作者 骆怡璇 朱莉 王思钱 刘祝成 麻健丰 《温州医科大学学报》 CAS 2024年第6期431-437,445,共8页
目的:研究皮秒激光在牙科氧化锆表面不同图案化扫描处理的结果,以及对氧化锆表面粘接性能的影响。方法:选取160例烧结氧化锆陶瓷试件,随机分为8个研究组,分别为空白对照组(A组)、喷砂对照组(B组)、皮秒激光处理组(C-H组,分别为:皮秒激... 目的:研究皮秒激光在牙科氧化锆表面不同图案化扫描处理的结果,以及对氧化锆表面粘接性能的影响。方法:选取160例烧结氧化锆陶瓷试件,随机分为8个研究组,分别为空白对照组(A组)、喷砂对照组(B组)、皮秒激光处理组(C-H组,分别为:皮秒激光蜂窝状扫描、喷砂后皮秒激光蜂窝状扫描、皮秒激光横线状扫描、喷砂后皮秒激光横线状扫描、皮秒激光井字格状扫描、喷砂后皮秒激光井字格状扫描)。扫描电镜观察表面微观组织形貌;激光共聚焦显微镜观察3D形貌,原子力显微镜测量表面粗糙度Ra;X射线衍射仪观测表面晶相组成的转变;电子万能试验机测量抗弯强度,测定氧化锆陶瓷与自粘型树脂水门汀的剪切强度;光学体式显微镜下观察断裂模式;采用SPSS26.0对所得结果进行单因素方差分析及多重检验。结果:皮秒激光在氧化锆表面扫描后,可分别得到蜂窝状、平行的等间距横线状及等间距井字格状图案;不同图案化处理后氧化锆表面粗糙度不同,横线状B组最大,为14.92μm;激光表面处理不会导致表面晶相转变;经过皮秒激光处理后,剪切粘接强度明显增加(P<0.05),C组的粘接强度最大,为(26.86±1.53)MPa,约为A组的7.4倍;断裂模式由A组与B组的完全粘结破坏转变为内聚破坏和混合破坏;激光处理后的氧化锆陶瓷抗弯强度满足临床应用要求。结论:皮秒激光对氧化锆表面进行图案化处理能够提高氧化锆与树脂水门汀的粘接强度,是一种有前景的氧化锆表面改性方法。 展开更多
关键词 皮秒激光 图案化 显微组织 氧化锆陶瓷 粘接性能
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前牙高透氧化锆全瓷冠修复单颗前牙缺损的美学效果分析 被引量:1
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作者 徐菁 李敏 《中国美容医学》 CAS 2024年第6期162-165,共4页
目的:探究高透氧化锆全瓷冠修复单颗前牙缺损的美学效果。方法:选取2018年1月-2020年10月笔者医院收治的单颗前牙缺损患者80例(共80颗患牙),按随机数表法分为观察组(高透氧化锆全瓷冠修复)和对照组(钴铬烤瓷冠修复),每组40例(40颗患牙)... 目的:探究高透氧化锆全瓷冠修复单颗前牙缺损的美学效果。方法:选取2018年1月-2020年10月笔者医院收治的单颗前牙缺损患者80例(共80颗患牙),按随机数表法分为观察组(高透氧化锆全瓷冠修复)和对照组(钴铬烤瓷冠修复),每组40例(40颗患牙),比较两组的修复效果,修复前、修复后1个月的牙周指标及龈沟液指标[碱性磷酸酶(Alkaline phosphatase,ALP)、白介素6(Interleukin-6,IL-6)、白介素8(Interleukin-8,IL-8)]水平,对比两组修复后1年的满意度及并发症发生情况。结果:修复后1年,两组颜色对比、边缘着色、解剖外形、边缘密合度、龋齿等修复效果评估观察组均高于对照组(P<0.05)。修复后1个月,两组牙周探诊深度、菌斑指数、出血指数均升高,但观察组低于对照组(均P<0.05);两组龈沟液ALP、IL-6、IL-8水平均降低,且观察组均低于对照组(均P<0.05)。修复后1年,观察组修复总满意度高于对照组(P<0.05);修复后1年期间,两组均未发生牙体腐蚀,疼痛、牙龈炎、根折发生率差异无统计学意义,观察组并发症总发生率低于对照组(P<0.05)。结论:采用高透氧化锆全瓷冠修复单颗前牙缺损的美学效果较好,可减轻牙周组织炎症,值得临床推广应用。 展开更多
关键词 前牙缺损 高透氧化锆全瓷冠 钴铬烤瓷冠 牙齿修复 美学效果 牙周指数
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不同清洁方法对高透氧化锆粘接强度和表面润湿性的影响
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作者 焦纪兰 叶心仪 +4 位作者 邓璐 江辉 李霄夏 曾利伟 谭建国 《上海口腔医学》 CAS 2024年第1期36-39,共4页
目的:研究不同清洁方法对唾液污染的高透氧化锆与自粘接树脂水门汀间剪切粘接强度和表面润湿性的影响。方法:制备80个高透氧化锆试件,随机分为5组(n=16),即对照组(无污染处理)、75%乙醇组、喷砂组、清洁剂组和大气压冷等离子体处理组等... 目的:研究不同清洁方法对唾液污染的高透氧化锆与自粘接树脂水门汀间剪切粘接强度和表面润湿性的影响。方法:制备80个高透氧化锆试件,随机分为5组(n=16),即对照组(无污染处理)、75%乙醇组、喷砂组、清洁剂组和大气压冷等离子体处理组等。测量表面接触角,测试剪切粘接强度,观察断裂模式。采用SPSS 26.0软件包对数据进行统计学分析。结果:大气压冷等离子体组的接触角最小(P<0.05);喷砂组、清洁剂组及大气压冷等离子体组的剪切粘接强度与对照组相比,无统计学差异(P>0.05),但均显著大于75%乙醇组(P<0.05);大气压冷等离子体组混合断裂模式增多。结论:喷砂、清洁剂及大气压冷等离子体清洁唾液污染的高透氧化锆,可获得与未被唾液污染前相当的粘接强度;大气压冷等离子体可显著提高高透氧化锆的表面润湿性。 展开更多
关键词 氧化锆 唾液污染 大气压冷等离子体 表面润湿性 粘接强度
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改良垂直型牙体预备技术在后牙区全锆冠修复治疗效果评价
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作者 许晓波 龚语林 +3 位作者 沈丽丽 王冕 王玉婷 吴映燕 《安徽医科大学学报》 CAS 北大核心 2024年第10期1881-1885,共5页
目的评价改良垂直型牙体预备在后牙区全锆冠修复治疗效果。方法采用随机数法对照研究,收集就诊并完成后牙区全瓷冠修复的84例患者共90颗全冠修复体,随机分组,其中实验组45颗全瓷冠修复治疗时,运用改良垂直型牙体预备基牙,对照组45颗患... 目的评价改良垂直型牙体预备在后牙区全锆冠修复治疗效果。方法采用随机数法对照研究,收集就诊并完成后牙区全瓷冠修复的84例患者共90颗全冠修复体,随机分组,其中实验组45颗全瓷冠修复治疗时,运用改良垂直型牙体预备基牙,对照组45颗患牙采用常规水平型牙体预备后完成全锆冠修复治疗。在患者戴牙时,分别评价两组修复体的修复效果,再采用硅橡胶复制法测量两组修复体冠的边缘和内部适合性;戴牙后6个月记录修复体周围的牙周指标牙龈指数(GI)和龈沟出血指数(SBI)评分值。结果两组修复体椅旁评价结果是实验组修复体的边缘适合性A级评价优于对照组修复体,差异有统计学意义(P=0.036);实验组修复体边缘适合性测量值优于对照组修复体,差异有统计学意义(P<0.001);6个月后复查时,两组修复体无机械并发症出现,牙周软组织指标GI和SBI评分值差异无统计学意义。结论改良垂直型牙体预备基牙能显著提升全瓷冠的边缘适合性,不会改变冠周牙龈健康状况。 展开更多
关键词 后牙区 垂直型牙体预备 无肩台牙体预备 单层氧化锆冠 适合性
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钨钼烧结炉用氧化锆质顶盖结构的优化研究
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作者 张涛 冯志源 +3 位作者 王晗 谭清华 范沐旭 刘鹏程 《工业加热》 CAS 2024年第8期63-66,71,共5页
结合当前钨钼烧结炉用氧化锆顶盖砖的使用情况,利用ANSYS软件,模拟分析了氧化锆顶盖砖异常损坏的原因,并通过对不同厚度、不同体积密度顶盖砖使用过程中应力场的模拟研究,对顶盖砖结构优化进行了探索。结果表明:顶盖砖在使用过程中的最... 结合当前钨钼烧结炉用氧化锆顶盖砖的使用情况,利用ANSYS软件,模拟分析了氧化锆顶盖砖异常损坏的原因,并通过对不同厚度、不同体积密度顶盖砖使用过程中应力场的模拟研究,对顶盖砖结构优化进行了探索。结果表明:顶盖砖在使用过程中的最大拉应力为27MPa,远远超过了材料的结合强度,从而造成“断裂”和“龟裂”,导致寿命降低;顶盖砖的体积密度和厚度对其使用过程中的热应力有着显著的影响,当氧化锆顶盖砖的体积密度在3.0~4.6g/cm^(3)时,降低体积密度可以减小顶盖砖使用过程中的热应力,综合体积密度对氧化锆空心球砖其他性能的影响,将当前用顶盖砖的体积密度提高至3.3g/cm^(3),厚度减薄至50mm时,顶盖砖使用过程中的最大热应力只有10.27MPa,而顶盖砖的抗折强度达到13.6MPa,从而有效改善其使用寿命。 展开更多
关键词 钨钼烧结炉 氧化锆空心球砖 ANSYS模拟
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氧化锆增强铝基复合材料的制备及性能研究
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作者 张鹏 祖祥博 +3 位作者 娄东阁 蒋烨倩 章冰 张柯 《有色金属材料与工程》 CAS 2024年第4期25-32,共8页
铝合金由于其强度高、质量轻、价格低等多重优势,在汽车制造、航空航天、水下装备等各个领域都极具应用前景。利用机械搅拌铸造方法制备了不同质量分数纳米氧化钇稳定氧化锆(yttrium oxide stabilized zirconia,YSZ)的Al-YSZ复合材料,... 铝合金由于其强度高、质量轻、价格低等多重优势,在汽车制造、航空航天、水下装备等各个领域都极具应用前景。利用机械搅拌铸造方法制备了不同质量分数纳米氧化钇稳定氧化锆(yttrium oxide stabilized zirconia,YSZ)的Al-YSZ复合材料,研究纳米YSZ质量分数对铝基复合材料组织和性能的影响。研究结果表明,添加的纳米YSZ均匀分布在Al基体中,不与Al基体发生反应。同时能够作为异质形核剂细化晶粒,并通过Orowan强化机制提升复合材料的力学性能。添加质量分数为8%的纳米YSZ的复合材料具有较好的强度和塑性。同时,在受到外力作用时,纳米YSZ会发生从四方到单斜的相变,并产生一定的体积膨胀,在吸收能量的同时改善了复合材料内部的晶格畸变,从而提高了铸态复合材料的塑性。 展开更多
关键词 铝基复合材料 氧化钇稳定氧化锆 铸造 力学性能
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