全文获取类型
收费全文 | 1435篇 |
免费 | 102篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 66篇 |
儿科学 | 13篇 |
妇产科学 | 5篇 |
基础医学 | 19篇 |
口腔科学 | 385篇 |
临床医学 | 170篇 |
内科学 | 132篇 |
皮肤病学 | 1篇 |
神经病学 | 25篇 |
特种医学 | 21篇 |
外科学 | 243篇 |
综合类 | 203篇 |
预防医学 | 81篇 |
眼科学 | 45篇 |
药学 | 100篇 |
中国医学 | 31篇 |
肿瘤学 | 23篇 |
出版年
2024年 | 2篇 |
2023年 | 36篇 |
2022年 | 40篇 |
2021年 | 65篇 |
2020年 | 66篇 |
2019年 | 57篇 |
2018年 | 52篇 |
2017年 | 58篇 |
2016年 | 43篇 |
2015年 | 50篇 |
2014年 | 124篇 |
2013年 | 100篇 |
2012年 | 101篇 |
2011年 | 103篇 |
2010年 | 86篇 |
2009年 | 65篇 |
2008年 | 44篇 |
2007年 | 71篇 |
2006年 | 46篇 |
2005年 | 50篇 |
2004年 | 35篇 |
2003年 | 28篇 |
2002年 | 29篇 |
2001年 | 25篇 |
2000年 | 19篇 |
1999年 | 18篇 |
1998年 | 16篇 |
1997年 | 12篇 |
1996年 | 9篇 |
1995年 | 12篇 |
1994年 | 14篇 |
1993年 | 11篇 |
1992年 | 14篇 |
1991年 | 7篇 |
1990年 | 8篇 |
1989年 | 6篇 |
1988年 | 3篇 |
1987年 | 8篇 |
1986年 | 7篇 |
1985年 | 6篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1978年 | 3篇 |
1976年 | 1篇 |
排序方式: 共有1563条查询结果,搜索用时 15 毫秒
11.
Wood dust is an irritant and is carcinogenic to the nasal mucosa. It inhibits its own clearance from the nose. It therefore makes sense to lavage retained wood dust from the nose following exposure. To our knowledge this is the second study conducted to determine whether the procedure of nasal lavage reduces nasal symptoms in woodworkers. Forty-six woodworkers from 150 approached volunteered to trial nasal lavage using gravity fed, home-made unbuffered isotonic saline for 2 months in a crossover trial and then be followed-up a year later. The group reported significantly decreased nasal symptoms and over half continued to use nasal lavage voluntarily after 1 year. Results support the findings of the previous study that nasal lavage improves nasal symptoms and supplements those findings with data indicating patterns of voluntary usage following the study's conclusion. It is concluded that nasal lavage is an acceptable, effective and inexpensive option with minimal side effects for woodworkers who experience nasal symptoms and who wish to try the procedure. 相似文献
12.
13.
��������� 《中国实用口腔科杂志》2017,10(8):488-492
??Objective To study the effect of different irrigation regimens and methods of activation on smear layer removal in root canals. Methods Thirty-two mandibular premolar roots were divided into 4 groups??with 8 teeth in each . In group A??the teeth were instrumented and irrigated by lateral opening syringe. In group B??irrigation was done using passive ultrasonic irrigation??PUI?? system. In group C RinsEndo root canal irrigation system was used and in group D??Vibringe sonic irrigation system. Scanning electron microscope evaluation was done for assessment of smear layer removal in the coronal??middle??and apical thirds. Results In each group??there was a smear layer covering the dentinal tubule in apical thirds??and the score was higher than that in the coronal and middle ??P??0.05??. The scores of B??C and D groups were lower than those in group A??P??0.05??. Among A??B??C??D groups in the area of the root canal wall??difference of smear layer score was not statistically significant. Conclusion Better removal of smear layer of the middle and apical thirds of root canal can be achieved by using RinsEndo??Vibringe and PUI system than by lateral opening syringe. 相似文献
14.
Arpana Arthi Devi
BDS PGDIP Paul V. Abbott
BDSc MDS FRACDS 《Australian endodontic journal : the journal of the Australian Society of Endodontology Inc》2012,38(2):50-54
The objectives of this study were to determine the direction and pattern of flow of irrigating solutions inside simulated root canals with different irrigation needles; and to determine whether different needle designs increase the likelihood of irrigating solution passing through the apical foramen. Two types of needles were compared: a standard needle with a bevel and an open end, and a needle with a side opening and closed rounded tip. Observations of irrigant flow within the canals indicated that the side‐venting needle can be dangerous if the needle gauge is small and it reaches the full length of the canal, since this allowed irrigants to flow into the periapical area. With the standard needle, the fluid did not go beyond the tip of the needle when minimal irrigating pressure was employed. As the size of canal increased, the fluid did not extrude beyond the tip of both needles. However, if the needles bound in the canals, then the fluid was forced away from the needle tip, and the pressure applied to the syringe was directly proportional to the distance the fluid flowed away from the needle tip. Both side‐venting and standard needles can be used for irrigation safely and effectively if a dynamic irrigation technique (moving the needle up and down inside the canals while irrigating) is employed. 相似文献
15.
上颌窦穿刺冲洗治疗儿童急慢性鼻窦炎的效果分析 总被引:1,自引:0,他引:1
尹世芬 《临床和实验医学杂志》2011,10(13):1015-1015,1017
目的分析上颌窦穿刺冲洗治疗儿童急慢性鼻窦炎的临床疗效。方法将320例儿童(7~12岁)急慢性鼻窦炎患者采用随机平行试验设计,分为实验组160例和对照组160例,两组均服用鼻窦炎口服液1次10 m l,每日3次,实验组在鼻腔黏膜麻醉下行上颌窦穿刺,用0.9%氯化钠溶液加甲硝唑注射液反复冲洗后,窦腔内注入地塞米松5mg,每周一次;鼻腔内滴1%呋喃西林麻黄素液,3次/d,15 d为一个疗程。对照组口服广谱抗生素+鼻腔内滴1%呋喃西林麻黄素液,3次/d,15 d为一个疗程。治疗结束后每月复查1次,6个月后进行疗效评定。结果实验组的治愈率84.38%,总有效率98.75%,均显著高于对照组,两组间比较有显著性差异(P<0.01)。结论上颌窦穿刺冲洗结合鼻窦炎口服液治疗儿童急、慢性鼻窦炎疗效可靠,穿刺前充分评估患儿病情,实施健康教育,加强心理护理是上颌窦穿刺治疗顺利进行的基础,也是上颌窦穿刺成功的重要保证。 相似文献
16.
17.
18.
Natalie Leow BDSc Paul Abbott BDSc MDS FRACDS Jacqueline Castro Salgado Odont Spec Endo Laura Firth BSc 《Australian endodontic journal : the journal of the Australian Society of Endodontology Inc》2012,38(3):107-112
Various methods are used to evaluate irrigants. The primary aim was to develop a model for preliminary testing of potential irrigants. The second aim was to investigate the effect of bicarbonate soda on smear layer by comparing it with ethylenediamine tetraacetic acid with cetrimide (EDTAC) and sodium hypochlorite (NaOCl). Extracted human single‐canal teeth were halved, and a uniform filing method was used to create smear layer. The following solutions were then applied – distilled water (control), 1% NaOCl, 17% EDTAC and bicarbonate soda at concentrations of 1%, 5%, 10% and 15%. Some samples had multiple solutions in different sequences. Samples were examined by scanning electron microscopy. Representative images were scored based on the degree of smear layer remaining. Results were analysed with the SAS system, using the GENMOD procedure. Complete smear layer was found in samples treated with all solutions except EDTAC used alone. There were no significant differences between the sequences, EDTAC/NaOCl/EDTAC and NaOCl/EDTAC/NaOCl. There were no significant differences between groups with and without bicarbonate soda. In conclusion, the model was effective for testing chemical effects on solutions on smear layer. Bicarbonate soda did not remove smear layer and provided no additional cleaning effects after EDTAC and NaOCl. 相似文献
19.
针对滴灌中侧翼迷宫式滴灌带的流量、灌水均匀度、肥料堵塞等问题,对4种不同规格的侧翼迷宫滴灌带进行试验,测定在清水和加肥灌水时滴头的流量及灌水均匀度。结果表明:加肥灌水时滴头流量比清水时减少,灌水均匀系数也较清水减小,4种不同结构滴头的灌水均匀度系数减小了5%~9.9%;随着灌水间隔增长,灌水次数增加,由于溶解在水中化学肥料结晶析出造成的堵塞程度逐渐增加;迷宫流道结构不同滴头的化学堵塞程度也不同。 相似文献
20.
Gisele Alborghetti Nai Denis Aloísio Lopes Medina Cesar Alberto Talavera Martelli Mayla Silva Cayres de Oliveira Maria Júlia Schadeck Portelinha Bruno Carvalho Henriques Isadora Delfino Caldeira Mrcia de Carvalho Almeida Lizziane Kretli Winkelstroter Eller Fausto Viterbo de Oliveira Neto Maringela Esther Alencar Marques 《Medicine》2021,100(13)
Surface treatment of medical devices may be a way of avoiding the need for replacement of these devices and the comorbidities associated with infection. The aim of this study was to evaluate whether pre- and postcontamination washing of 2 prostheses with different textures can decrease bacterial contamination.The following microorganisms were evaluated: Staphylococcus aureus, Staphylococcus epidermidis, Proteus mirabilis and Enterococcus faecalis. Silicone and expanded polytetrafluoroethylene vascular prostheses were used and divided into 3 groups: prostheses contaminated; prostheses contaminated and treated before contamination; and prostheses contaminated and treated after contamination. Treatments were performed with antibiotic solution, chlorhexidine and lidocaine. After one week of incubation, the prostheses were sown in culture medium, which was incubated for 48 hours. The area of colony formation was evaluated by fractal dimension, an image analysis tool.The antibiotic solution inhibited the growth of S epidermidis and chlorhexidine decrease in 53% the colonization density for S aureus in for both prostheses in the pre-washing. In postcontamination washing, the antibiotic solution inhibited the growth of all bacteria evaluated; there was a 60% decrease in the colonization density of S aureus and absence of colonization for E faecalis with chlorhexidine; and lidocaine inhibited the growth of S aureus in both prostheses.Antibiotic solution showed the highest efficiency in inhibiting bacterial growth, especially for S epidermidis, in both washings. Lidocaine was able to reduce colonization by S aureus in post-contamination washing, showing that it can be used as an alternative adjuvant treatment in these cases. 相似文献