全文获取类型
收费全文 | 396803篇 |
免费 | 25888篇 |
国内免费 | 2929篇 |
专业分类
耳鼻咽喉 | 5409篇 |
儿科学 | 8489篇 |
妇产科学 | 10329篇 |
基础医学 | 55627篇 |
口腔科学 | 12322篇 |
临床医学 | 31360篇 |
内科学 | 83189篇 |
皮肤病学 | 8857篇 |
神经病学 | 28330篇 |
特种医学 | 14488篇 |
外国民族医学 | 82篇 |
外科学 | 63515篇 |
综合类 | 10050篇 |
现状与发展 | 1篇 |
一般理论 | 65篇 |
预防医学 | 18035篇 |
眼科学 | 9935篇 |
药学 | 32144篇 |
1篇 | |
中国医学 | 2221篇 |
肿瘤学 | 31171篇 |
出版年
2021年 | 2990篇 |
2019年 | 3001篇 |
2018年 | 4901篇 |
2017年 | 3729篇 |
2016年 | 3898篇 |
2015年 | 4389篇 |
2014年 | 6176篇 |
2013年 | 7961篇 |
2012年 | 10920篇 |
2011年 | 11236篇 |
2010年 | 6741篇 |
2009年 | 6303篇 |
2008年 | 10298篇 |
2007年 | 11245篇 |
2006年 | 11143篇 |
2005年 | 10244篇 |
2004年 | 9682篇 |
2003年 | 9445篇 |
2002年 | 9029篇 |
2001年 | 28740篇 |
2000年 | 29248篇 |
1999年 | 24163篇 |
1998年 | 5390篇 |
1997年 | 4426篇 |
1996年 | 4036篇 |
1995年 | 3646篇 |
1994年 | 3246篇 |
1993年 | 2980篇 |
1992年 | 16398篇 |
1991年 | 15131篇 |
1990年 | 14442篇 |
1989年 | 14290篇 |
1988年 | 12856篇 |
1987年 | 12323篇 |
1986年 | 11361篇 |
1985年 | 10557篇 |
1984年 | 7076篇 |
1983年 | 5736篇 |
1982年 | 2808篇 |
1979年 | 5619篇 |
1978年 | 3469篇 |
1977年 | 3066篇 |
1976年 | 2305篇 |
1975年 | 2700篇 |
1974年 | 3133篇 |
1973年 | 2944篇 |
1972年 | 2886篇 |
1971年 | 2868篇 |
1970年 | 2581篇 |
1969年 | 2617篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
T.-Y. Huang Y.-J. Hsia M.-Y. Sung Y.-T. Wu P.-C. Hsu 《International journal of oral and maxillofacial surgery》2021,50(8):1100-1106
Zygomatic implant treatment is widely applied for severe maxillary atrophy to help rehabilitate the maxillary dentition. This retrospective study was performed to evaluate the actual radiographic bone–implant contact (rBIC) lengths of zygomatic implants. The records of 28 patients who underwent zygomatic implant surgery and subsequent follow-up examinations between August 2013 and September 2018 in the Department of Oral and Maxillofacial Surgery, Taipei Tzu Chi Hospital were reviewed. The surgeries were performed by a single surgeon using the same treatment protocol. All patients had a computed tomography scan at 1 year after the surgery. Using three-dimensional imaging software, an investigator measured the rBIC lengths of 66 implants and documented their clinical status. The implant survival rate was 100%. The mean rBIC length was significantly longer in male patients than in female patients (20.80 ± 5.88 mm versus 17.79 ± 6.34 mm; P = 0.028). The mean rBIC length of double zygomatic implants was significantly longer when compared to that of single implants (21.11 ± 6.23 mm versus 17.75 ± 5.85 mm; P = 0.027). This article is novel in reporting the exact rBIC lengths of zygomatic implants in a clinical setting. The results showed that zygomatic implants are a viable treatment modality for full-mouth rehabilitation. 相似文献
32.
33.
34.
Y. Ermias I.A. Morgan K.M. Curtis M.K. Whiteman L.G. Horton L.B. Zapata 《Contraception》2019,99(5):300-305
ObjectiveIdentify factors associated with healthcare providers' frequency of depot medroxyprogesterone acetate (DMPA) provision to adolescents.Study designWe analyzed data from surveys mailed to a nationally representative sample of public-sector providers and office-based physicians (n=1984). We estimated adjusted odds ratios (aORs) and 95% confidence intervals (CIs) of factors associated with frequent DMPA provision to adolescents in the past year.ResultsAlthough most providers (>95%) considered DMPA safe for adolescents, fewer reported frequent provision (89% of public-sector providers; 64% of office-based physicians). Among public-sector providers, factors associated with lower odds of frequent provision included working in settings without Title X funding (aOR 0.44, 95% CI 0.30–0.64), reporting primary care as their primary clinical focus versus reproductive or adolescent health (aOR 0.42, 95% CI 0.28–0.61), and providing fewer patients with family planning services. Among office-based physicians, factors associated with lower odds of frequent provision included specializing in obstetrics/gynecology (aOR 0.50, 95% CI 0.27–0.91) and family medicine (aOR 0.21, 95% CI 0.09–0.47) versus adolescent medicine, completing training ≥15 versus <5 years ago (aOR 0.27, 95% CI 0.09–0.83), and reporting that 0–24% of patients pay with Medicaid or other government healthcare assistance versus ≥50% (aOR 0.23, 95% CI 0.09–0.61). The reason most commonly reported by providers for infrequent DMPA provision was patient preference for another method.ConclusionsWhile most providers reported frequently providing DMPA to adolescents, training on evidence-based recommendations for contraception, focused on subgroups of providers with lower odds of frequent DMPA provision, may increase adolescents' access to contraception.ImplicationsAlthough >95% of providers considered depot medroxyprogesterone (DMPA) a safe contraceptive for adolescents, only 89% of public-sector providers and 64% of office-based physicians reported frequently providing DMPA to adolescents. Provider training on evidence-based recommendations for contraception counseling and provision may increase adolescents' access to DMPA and all methods of contraception. 相似文献
35.
Prevention Science - This study aimed to evaluate the effectiveness of the drug and violence resistance educational program (PROERD) on short-term secondary outcomes, such as intentions to use... 相似文献
36.
37.
38.
K. Miura S. Yamaoka K. Arizono S. Ohba T. Koga T. Kawasaki N. Yoshida I. Asahina 《The British journal of oral & maxillofacial surgery》2019,57(6):529-535
Our aim was to evaluate the long-term skeletal stability of the mandible in 21 patients after orthognathic surgery with physiological positioning. The measurement points SNB, B point (X, Y), Pog (X, Y), and the angle of the ramus were measured on cephalometric photographs to assess skeletal stability preoperatively, immediately after operation, and one and two years postoperatively. In addition, we evaluated the clinical symptoms of disorders of the temporomandibular joint (TMJ). The analysis of the cephalometric photographs showed that SNB, B point X, and Pog X showed no significant differences among the postoperative time points. On the other hand, B point Y and Pog Y showed no significant differences throughout the study period. We compared the angle of the ramus before operation and two years postoperatively, and no significant difference was found. In addition, no cases showed any pathological symptoms of disorders of the TMJ two years postoperatively. The long-term stability after orthognathic surgery with physiological positioning was confirmed, and it seems to be a reliable orthognathic treatment in patients with mandibular prognathism. 相似文献
39.
40.