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   504篇
  免费   86篇
  国内免费   4篇
耳鼻咽喉   17篇
儿科学   3篇
妇产科学   3篇
基础医学   16篇
口腔科学   443篇
临床医学   3篇
内科学   4篇
神经病学   2篇
特种医学   10篇
外科学   38篇
综合类   37篇
预防医学   1篇
药学   4篇
肿瘤学   13篇
  2023年   5篇
  2022年   12篇
  2021年   25篇
  2020年   24篇
  2019年   30篇
  2018年   18篇
  2017年   31篇
  2016年   26篇
  2015年   34篇
  2014年   40篇
  2013年   32篇
  2012年   28篇
  2011年   29篇
  2010年   29篇
  2009年   27篇
  2008年   32篇
  2007年   35篇
  2006年   16篇
  2005年   30篇
  2004年   11篇
  2003年   17篇
  2002年   13篇
  2001年   10篇
  2000年   5篇
  1999年   7篇
  1998年   3篇
  1997年   5篇
  1996年   4篇
  1995年   1篇
  1994年   3篇
  1993年   2篇
  1992年   1篇
  1991年   2篇
  1989年   2篇
  1986年   1篇
  1985年   1篇
  1981年   2篇
  1977年   1篇
排序方式: 共有594条查询结果,搜索用时 15 毫秒
1.
The aim of this retrospective study was to investigate the accuracy of dynamic navigation for the placement of intentionally tilted implants in the posterior maxilla. The study included 12 patients with edentulism or continuous multiple tooth loss, who had 48 implants inserted under dynamic navigation guidance in the posterior maxilla. Twenty-four implants near maxillary sinuses were intentionally tilted. The average platform deviation was 1.3 ± 0.4 mm (range 0.8–2.3 mm), apex deviation was 1.1 ± 0.5 mm (range 0.2–2.3 mm), and axis deviation was 3.1 ± 1.0° (range 1.8–6.7°). The other 24 implants were axially positioned. The average platform deviation was 1.5 ± 0.5 mm (range 0.7–3.1 mm), apex deviation was 1.3 ± 0.7 mm (range 0.5–3.1 mm), and axis deviation was 3.2 ± 1.5° (range 1.5–7.7°). There was no significant difference in platform deviation, apex deviation, or axis deviation between the tilted implants and implants in the axial position (P > 0.05). This analysis indicates that a dynamic navigation system can be used as a method of guidance to place intentionally tilted implants as accurately as axially positioned implants in the posterior maxilla, thereby preventing damage to the maxillary sinuses and the need to graft bone.  相似文献   
2.
3.
The aim of this retrospective study was to evaluate the outcomes of simultaneous LeFort I osteotomy and zygomatic/dental implant placement for oral rehabilitation of patients with extremely atrophic/dysmorphic edentulous maxilla.Simultaneous LeFort I osteotomy and zygomatic/dental implant placement was performed with patient-specific anatomical models and surgical guides produced through three-dimensional virtual planning methods. All patients received their final prosthesis, with immediate loading, on the day after surgery. The primary outcome variables were the implant survival rate, and the incidence of intra/postoperative complications. In total, 15 zygomatic implants and 33 conventional dental implants were inserted in eight patients. The mean follow-up of the patients was 38.5 months. The implant survival rate was 93.3% for zygomatic implants and 100% for dental implants. No intra/postoperative complications were observed.Simultaneous LeFort I osteotomy associated with zygomatic/dental implant surgery can be considered as a valuable treatment option for rehabilitation of patients with extremely atrophic edentulous maxilla and esthetic issues of the face.  相似文献   
4.

Purpose

The number of implants needed to support a maxillary overdenture is still a controversial issue. The aim of this systematic review was to investigate the number of implants required to support a maxillary overdenture in order to obtain optimal treatment outcomes in terms of implant survival, overdenture longevity and patient satisfaction.

Study selection

Pubmed and EMBASE databes were systematically searched and complemented by hand searching from 2000 to 2017. The Prisma statement and a PICOS approach were adopted. All selected articles provided at least two-year follow-up and 10 totally edentulous patients. Survival rate of implants and overdentures were statistically analyzed according to number of implants and according to splitting technique, employing non-parametric Fisher Test for unpaired data. For the pooled analysis of implant failures, the odds ratio between group of 4 splinted implants and group of more than 4 splinted was calculated.

Results

A total of 28 articles were included. Data analysis of the included studies showed that the survival rate of implants appeared higher in ≥ 4 implants group, whereas the high survival rate of overdentures and patient satisfaction were not significantly influenced by the number of implants.

Conclusions

The findings of our analysis indicate that overall the most frequent tendency is to place at least four implants, splinted or unsplinted, in order to ensure a higher survival rate of implants. However, the relationship between overdenture survival, the patient’s quality of life, and the number of implants required to support a maxillary overdenture has yet to be clarified.  相似文献   
5.
张彤媚  杨锟  沈军  刘浩  陈伟  白爽  穆洁  严颖彬 《天津医药》2020,48(3):195-199
目的 总结采用组织瓣进行上颌骨缺损重建的临床效果。方法 回顾 2012年 8月—2018年 12月于我院行上颌骨切除并即刻行缺损重建的 36例患者,分析上颌骨缺损类型与重建方法的关系。结果 按照 Brown分类,上颌骨Ⅱb类缺损 22例,Ⅱc类缺损 3例,Ⅱd类缺损 8例,Ⅲb类缺损 3例。33例(91.7%)Ⅱ类缺损中,采用腓骨瓣修复 2例,颏下岛状瓣修复 17例,前臂皮瓣修复 14例。3例(8.3%)Ⅲb类缺损均采用组织瓣联合预成型的个性化钛网修复。所有患者皮瓣制备时间(64±15)min。手术时间(420.6±75.5)min,术中出血(650.5±172.3)mL,皮瓣最大 12 cm×5 cm,最小 8 cm×4 cm。术后所有组织瓣均完全成活,无一例发生局部坏死或完全坏死。术后平均随访(24.5±13.6)个月,随访期间,3 例死亡(鳞癌 T2N0M0 和 T3N0M0 各 1 例,腺样囊性癌 T3N0M0 1 例),2 例复发(均为腺样囊性癌T3N0M0),其余 31 例均无瘤生存;无一例发生口腔上颌窦瘘,外形满意率 88.9%(32/36),发音清晰率为 91.7%(33/36)。结论 采用血管化组织瓣重建上颌骨Ⅱ类缺损能获得较为满意的外形、发音和口鼻腔封闭,组织瓣联合个性化钛网是修复上颌骨Ⅲ类缺损的适宜方法。  相似文献   
6.
婴儿色素性神经外胚层瘤是一种罕见的起源于神经嵴的色素性神经外胚层瘤,通过本病例分析其临床、CT及病理学特征,旨在提高对本病的认识,为临床诊治提供依据。  相似文献   
7.
8.
9.
The facial malformations of Crouzon syndrome involve the entire cranio-orbito-zygomatic region. The detailed sequence of changes in orbit, zygoma, and maxilla over time, the mutual influence among these three anatomical structures, and their relationship with the cranial base were studied to determine the sequence and timing of deformity. Preoperative CT scans of 36 patients with Crouzon syndrome (mean age 10.84 ± 14.70 years; 14 male, 22 female) and CT scans of 54 control subjects (mean age 8.53 ± 13.22 years; 29 male, 25 female) were divided into five subgroups by age: 0–6 months, 6 months–2 years, 2–6 years, 6–18 years, and 18–62 years. Craniofacial morphometric cephalometrics were analyzed using Materialise software. Crouzon orbit anteroposterior length was shorter before 6 months (P = 0.021) and remained shorter into adulthood (P < 0.001). Globe projection was greater across all age subgroups (P < 0.001), reaching a peak at 6 months to 2 years (P < 0.001). The increased medial orbital width was the most remarkable and persistent secondary deformity (P < 0.001). The zygoma anterior protrusion was retruded before 6 months of age (P < 0.001), but then improved gradually. The width of maxilla was greater by 24% in the Crouzon cohort (P < 0.001), with a difference of 16% before 6 months (P = 0.024), and was developed earlier than the shortened anteroposterior length. Crouzon high and shallow orbital walls are distinctive. Maxillary widening developed before the malformation of sphenoid. The anteroposterior position of zygoma is likely a principal deformity, rather than a reflection of the intrinsic shape of the bone.Level of Evidence: II  相似文献   
10.
The aim of this study was to assess implant retreatment in a group of patients whose maxillary implants were all failing after full arch rehabilitation. Treatment involved implant removal, augmentation, and placement of an overdenture supported by four to six implants. All consecutive patients referred between 2008 and 2018, following multiple late implant failures in the rehabilitated maxilla, were included in the study. Seventy implants in 15 patients were evaluated at 3.3 ± 2.5 years (range 1.1–8.6 years) after loading. Implant survival, complications, clinical parameters, marginal bone loss, and patient-related outcome measures were recorded at the time of evaluation. Overall implant survival was 95.7%. Three implant failures occurred within the first year of function. Marginal bone loss was 0.32 ± 0.46 mm; pocket probing depth was 4.55 ± 1.59 mm. Plaque, calculus, inflammation, and bleeding were hardly seen (median index score 0). Patients scored their satisfaction with their overdentures as high (mean overall score 8.7 ± 1.2, maximum 10). Chewing soft and tough food was scored as ‘good’ and hard food as ‘moderate’. The mean Oral Health Impact Profile score was 29.5 ± 33.3. It can be concluded that the replacement of multiple failing implants in an edentulous maxilla after bone augmentation is a safe and predictable treatment procedure when applied as an implant-supported overdenture.  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