首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   7909篇
  免费   1032篇
  国内免费   31篇
耳鼻咽喉   156篇
儿科学   40篇
妇产科学   22篇
基础医学   191篇
口腔科学   6610篇
临床医学   203篇
内科学   409篇
皮肤病学   82篇
神经病学   101篇
特种医学   55篇
外科学   614篇
综合类   17篇
预防医学   130篇
眼科学   69篇
药学   100篇
中国医学   28篇
肿瘤学   145篇
  2024年   27篇
  2023年   344篇
  2022年   31篇
  2021年   77篇
  2020年   126篇
  2019年   59篇
  2018年   262篇
  2017年   350篇
  2016年   388篇
  2015年   487篇
  2014年   493篇
  2013年   512篇
  2012年   315篇
  2011年   329篇
  2010年   390篇
  2009年   575篇
  2008年   313篇
  2007年   269篇
  2006年   262篇
  2005年   198篇
  2004年   187篇
  2003年   224篇
  2002年   180篇
  2001年   186篇
  2000年   160篇
  1999年   173篇
  1998年   234篇
  1997年   204篇
  1996年   199篇
  1995年   180篇
  1994年   170篇
  1993年   128篇
  1992年   139篇
  1991年   85篇
  1990年   93篇
  1989年   55篇
  1988年   86篇
  1987年   79篇
  1986年   38篇
  1985年   60篇
  1984年   59篇
  1983年   58篇
  1982年   52篇
  1981年   33篇
  1978年   11篇
  1977年   10篇
  1976年   12篇
  1975年   15篇
  1974年   12篇
  1972年   11篇
排序方式: 共有8972条查询结果,搜索用时 15 毫秒
41.
The popularity of vital tooth whitening has increased significantly over the past two decades. Professionally supervised "in-office" and "at-home" tooth whitening methods have been documented in the literature with evidence of safety and effectiveness. Although the literature includes considerable information about vital tooth whitening in adults, minimal information is available concerning vital tooth whitening in children and adolescents.
The need to provide vital tooth whitening for children might be infrequent owing to the natural whiteness of children's teeth. However, there are circumstances when tooth whitening can be desirable for children, such as fluorosis discoloration, generalized tooth darkening, post-traumatic injury discoloration, and postorthodontic tooth discoloration.
Few well-controlled clinical trials evaluating the safety and effectiveness of vital tooth whitening in children are available in the literature, Furthermore, these published clinical trials were carried out by the same principal investigator. This review examines these trials and offers recommendations accordingly.  相似文献   
42.
43.
44.
The aim was to identify the incidence and types of possible adverse events in the masticatory system after treatment with a mandibular protruding device (MPD) during a 2-year period in patients with obstructive sleep apnea (OSA) or snoring. The subjects comprised 65 middle-aged patients (44 OSA patients, 21 snorers). A clinical examination and a questionnaire concerning signs and symptoms from the masticatory system were performed before, after 6 months, and after 2 years of MPD use. The frequencies of registered signs from the masticatory system, such as muscle and joint tenderness, palpation, and pain during mandibular movement, decreased significantly between baseline and the 2-year follow-up. There were significant changes in the mandibular range of protrusion (+0.7 mm, P < .001), overjet (-0.5 mm, P < .001), and overbite (-0.6 mm, P < .001) compared with the initial examination. Nine patients developed a lateral open bite during treatment, and 2 of them experienced subjective symptoms related to the altered occlusion but still used the MPD every night. No patient reported pain on opening the mouth wide or during jaw movements. Two reported tiredness on jaw function. The reported frequency of headaches was also significantly reduced (P < .01). The high compliance rate in MPD use showed that the therapy is well tolerated, but there is a risk of minor alterations in the occlusion during MPD treatment.  相似文献   
45.
46.
47.
During the treatment of patients with renal failure or renal transplants the most important consideration is to eliminate sources of infection before and after the treatment. Acute or chronic oral infections or bacteraemias resulting from dental procedures may cause serious complications in these patients who already have lowered host resistance caused by immunosuppressant therapy. In order to determine the latest concepts from some international transplantation centres relating to the importance of and the effect of infective sources in the oral cavity, a survey form was prepared which included several questions related to oral foci of infection and renal transplantations.
Results obtained from 22 centres from 12 countries indicated that the majority of the centres included a dental examination in their routine protocol and required completion of any necessary dental treatment before transplantation. However, full agreement among all these centres on the necessity for dental examination as part of the protocol has not yet been reached.  相似文献   
48.
49.
A patient with Type I hypoplastic patterned amelogenesis imperfecta, subtype D, presented for prosthodontic evaluation. This article describes the developmental and pathophysiological background of this disease. A clinical report describing the diagnosis, treatment planning, and dental rehabilitation of the patient is reviewed.  相似文献   
50.
Most cases with recurrent parotitis in childhood (RPC) can be cured before puberty.1–3 A few of them, however, may continue to adulthood.1–4 To distinguish this condition from other types of chronic parotitis in adults, such as chronic obstructive parotitis,5 we suggest that the diagnosis of recurrent parotitis in adults (RPA) be reserved for the cases derived from RPC.6 The pathophysiology and development of RPA is still not well known. To our knowledge, there are few reports of RPA in the literature, especially concerning its histopathology. This report describes a cases of RPA studied with sialography and light and electron microscopy.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号