全文获取类型
收费全文 | 90篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
基础医学 | 10篇 |
口腔科学 | 34篇 |
内科学 | 1篇 |
神经病学 | 13篇 |
特种医学 | 3篇 |
外科学 | 11篇 |
综合类 | 7篇 |
预防医学 | 5篇 |
药学 | 7篇 |
中国医学 | 1篇 |
肿瘤学 | 1篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 5篇 |
2015年 | 4篇 |
2014年 | 5篇 |
2013年 | 5篇 |
2012年 | 3篇 |
2011年 | 6篇 |
2010年 | 3篇 |
2009年 | 5篇 |
2008年 | 2篇 |
2007年 | 2篇 |
2006年 | 4篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 2篇 |
2001年 | 6篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1993年 | 2篇 |
1990年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1973年 | 2篇 |
1968年 | 1篇 |
排序方式: 共有93条查询结果,搜索用时 0 毫秒
1.
Effect of surface conditioning methods on the bond strength of luting cement to ceramics 总被引:9,自引:0,他引:9
OBJECTIVES: This study evaluated the effect of three different surface conditioning methods on the bond strength of a Bis-GMA based luting cement to six commercial dental ceramics. METHODS: Six disc shaped ceramic specimens (glass ceramics, glass infiltrated alumina, glass infiltrated zirconium dioxide reinforced alumina) were used for each test group yielding a total number of 216 specimens. The specimens in each group were randomly assigned to one of the each following treatment conditions: (1) hydrofluoric acid etching, (2) airborne particle abrasion, (3) tribochemical silica coating. The resin composite luting cement was bonded to the conditioned and silanized ceramics using polyethylene molds. All specimens were tested at dry and thermocycled (6.000, 5-55 degrees C, 30 s) conditions. The shear bond strength of luting cement to ceramics was measured in a universal testing machine (1 mm/min). RESULTS: In dry conditions, acid etched glass ceramics exhibited significantly higher results (26.4-29.4 MPa) than those of glass infiltrated alumina ceramics (5.3-18.1 MPa) or zirconium dioxide (8.1 MPa) (ANOVA, P<0.001). Silica coating with silanization increased the bond strength significantly for high-alumina ceramics (8.5-21.8 MPa) and glass infiltrated zirconium dioxide ceramic (17.4 MPa) compared to that of airborne particle abrasion (ANOVA, P<0.001). Thermocycling decreased the bond strengths significantly after all of the conditioning methods tested. SIGNIFICANCE: Bond strengths of the luting cement tested on the dental ceramics following surface conditioning methods varied in accordance with the ceramic types. Hydrofluoric acid gel was effective mostly on the ceramics having glassy matrix in their structures. Roughening the ceramic surfaces with air particle abrasion provided higher bond strengths for high-alumina ceramics and the values increased more significantly after silica coating/silanization. 相似文献
2.
氧化铝-羟基磷灰石修复兔骨腔隙性骨缺损的CT观察 总被引:1,自引:1,他引:0
目的通过CT摄片观察致密型氧化铝-羟基磷灰石人工骨材料修复兔骨腔隙性骨缺损的效果。方法采用放电等离子烧结(SPS,SparkPlasmaSintering)技术制备氧化铝-羟基磷灰石(Al2O3-HA)人工骨,植入兔股骨腔隙性骨缺损模型中,术后1天、12周通过CT摄片,观察人工骨与兔骨结合状况。结果术后12周宿主骨缺损完全愈合。结论SPS技术烧结的氧化铝-羟基磷灰石人工骨具有良好的生物相容性,是一种理想的承重骨人工骨替代材料。 相似文献
3.
Guess PC Schultheis S Bonfante EA Coelho PG Ferencz JL Silva NR 《Dental clinics of North America》2011,(2):333-352
Several all-ceramic systems have been developed in dentistry to meet the increased expectations of patients and dentists for highly aesthetic, biocompatible, and long-lasting restorations. However, early bulk fractures or chippings have led the research community to investigate the mechanical performance of the all-ceramic systems. This overview explores the current knowledge of monolithic and bilayer dental all-ceramic systems, addressing composition and processing mechanisms, laboratory and clinical performance, and possible future trends for all-ceramic materials. 相似文献
4.
氧化铝/羟基磷灰石修复兔桡骨缺损模型的手术方法学研究 总被引:1,自引:0,他引:1
目的通过对运用两种方法建立氧化铝/羟基磷灰石纳米陶瓷骨替代材料修复兔桡骨缺损模型研究,探讨因手术方式、材料的固定模式等因素对实验建模的影响。方法把20只成年中国家兔随机分为A、B两组,采用不同的术式将双侧桡骨制造成10-14mm长的骨缺损模型,分别植入氧化铝/羟基磷灰石纳米陶瓷A、B两型骨替代材料,术后进行一般情况观察和1、2周X线平片检查。结果术式A的建模成功率为60.0%,术式B建模成功率为89.5%,两者有显著性差异(χ2=4.439,P<0.05)。结论术中创伤小,对兔前臂组织结构破坏少的B术式和具有内固定功能B型材料的组合是良好的建模方式。 相似文献
5.
An alumina ball milling method was applied to enhance the adhesiveness and smoothness of the diaphragm-to-housing (D-H) junction. The impact produced by the three rotating alumina balls along the meshed junction made the surface of the junction uniform and smooth. The quality of the D-H junction was evaluated by various methods, such as inspection using an optical microscope and a scanning electron microscope, smoothness examination by an atomic force microscope, and measurement of the tensile strength. All the evaluations revealed marked improvements, and the platelet adhesion test revealed that the alumina ball milling method plays an important role in the blood compatibility enhancement of the D-H junction.Part of this paper was presented at the poster session of the ASAIO (2002) meeting 相似文献
6.
目的 探讨在全瓷冠基牙预备轴壁聚合度偏大的情况下,调整氧化铝内冠轴壁聚合度对全瓷冠抗压强度的影响.方法 将离体的上颌左中切牙制备成轴壁内聚12°的基牙预备体,并制作A、B、C组轴壁聚合度(4°、8°、12°)的氧化铝内冠.内冠上堆筑饰面瓷恢复牙冠形态,通过加载实验测试其抗压强度.结果 A组抗压强度最高,A、B组间无统计... 相似文献
7.
Objectives
The aim of this study was to evaluate the influence of different treatments on the surface roughness of In-Ceram Alumina (VITA, Säckingen, Germany).Methods
The ceramic blocks were polished (4000 grit) and sandblasted (SB) with airborne particle abrasion Al2O3; 110 μm particle size; 2.8 bar; 20 s. The following treatments were performed: (1) no treatment; (2) Rocatec System (RC): after SB treatment, sandblasting with silica powder; 30 μm particle size; 2.8 bar; 20 s. (3) Neodymium:yttrium–aluminium–garnet (Nd:YAG) laser (ND) application of graphite powder (stain) on the ceramic surface and Nd:YAG laser irradiation (distance: 1 mm, 100 mJ, 20 Hz, 2 W, and 141.54 J/cm2). (4) Nd:YAG laser plus Rocatec System: after ND treatments, RC was applied. Digital images (20 μm × 20 μm) from the surfaces were obtained by means of an AFM microscope in taping mode (Nanoscope IIIa, Digital Instruments). Roughness was measured in 10 μm × 10 μm boxes. Roughness (Ra) data (nm) were analyzed by one-way ANOVA (p < 0.05).Results
No differences in ceramic surfaces roughness occurred after any of the tested treatments (p = 0.54).Conclusions
High-alumina ceramic surface roughness was not increased with any of the tested treatments. 相似文献8.
9.
10.
《Biomaterials》2015
In order to fulfill the clinical requirements for strong, tough and stable ceramics used in dental applications, we designed and developed innovative zirconia-based composites, in which equiaxial α-Al2O3 and elongated SrAl12O19 phases are dispersed in a ceria-stabilized zirconia matrix. The composite powders were prepared by an innovative surface coating route, in which commercial zirconia powders were coated by inorganic precursors of the second phases, which crystallize on the zirconia particles surface under proper thermal treatment. Samples containing four different ceria contents (in the range 10.0–11.5 mol%) were prepared by carefully tailoring the amount of the cerium precursor during the elaboration process. Slip cast green bodies were sintered at 1450 °C for 1 h, leading to fully dense materials. Characterization of composites by SEM and TEM analyses showed highly homogeneous microstructures with an even distribution of both equiaxial and elongated-shape grains inside a very fine zirconia matrix.Ce content plays a major role on aging kinetics, and should be carefully controlled: sample with 10 mol% of ceria were transformable, whereas above 10.5 mol% there is negligible or no transformation during autoclave treatment.Thus, in this paper we show the potential of the innovative surface coating route, which allows a perfect tailoring of the microstructural, morphological and compositional features of the composites; moreover, its processing costs and environmental impacts are limited, which is beneficial for further scale-up and real use in the biomedical field. 相似文献