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   6793篇
  免费   974篇
  国内免费   17篇
耳鼻咽喉   152篇
儿科学   24篇
妇产科学   7篇
基础医学   34篇
口腔科学   6555篇
临床医学   116篇
内科学   135篇
皮肤病学   67篇
神经病学   42篇
特种医学   20篇
外科学   469篇
预防医学   69篇
眼科学   4篇
药学   6篇
肿瘤学   84篇
  2024年   26篇
  2023年   341篇
  2021年   24篇
  2020年   103篇
  2019年   18篇
  2018年   218篇
  2017年   320篇
  2016年   356篇
  2015年   433篇
  2014年   445篇
  2013年   434篇
  2012年   223篇
  2011年   226篇
  2010年   338篇
  2009年   535篇
  2008年   223篇
  2007年   186篇
  2006年   179篇
  2005年   142篇
  2004年   131篇
  2003年   185篇
  2002年   142篇
  2001年   181篇
  2000年   157篇
  1999年   169篇
  1998年   232篇
  1997年   203篇
  1996年   196篇
  1995年   176篇
  1994年   169篇
  1993年   126篇
  1992年   141篇
  1991年   86篇
  1990年   92篇
  1989年   57篇
  1988年   84篇
  1987年   78篇
  1986年   37篇
  1985年   60篇
  1984年   59篇
  1983年   57篇
  1982年   52篇
  1981年   32篇
  1978年   11篇
  1977年   10篇
  1976年   11篇
  1975年   15篇
  1974年   12篇
  1973年   9篇
  1972年   12篇
排序方式: 共有7784条查询结果,搜索用时 15 毫秒
51.
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   
52.
53.
54.
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   
55.
56.
57.
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   
58.
59.
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   
60.
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