Abstract:
BACKGROUND:In dental clinics, dentition defects are commonly restored with conventional porcelain-fused-to-metal fixed bridges. However, Ni-Cr alloy ceramic fixed bridges are known to have several drawbacks such as marginal coloration of the neck, low casting precision and, most seriously, poor biocompatibility. These problems could be circumvented by using noble metal ceramic bridges; however, one negative issue related to the conventional noble metal ceramic bridges is its high price due to the use of a large amount of gold for pontic. Therefore, an auro-galvanoforming ceramic bridge would be ideal to retain the advantages of a conventional material, yet reduce the amount of noble metal used. This study aimed to investigate whether any destructive changes occur to the auro-galvanoforming ceramic bridge under a fatigue cyclic loading test. METHODS:On standard models which the left maxillary first premolar is lost and with the cuspid teeth and the second premolar as the fixed bridge abutment teeth, six maxillary auro-galvanoforming ceramic bridges and six corresponding nichrome ceramic jointed crowns were made as group A, six nichrome ceramic bridges and six corresponding nichrome ceramic jointed crowns were made as group B (control group). And then all specimens were fixed and tested on a fatigue cyclic loading machine; the changes occurring to the surfaces of occlusal contact with large functional area and to the porcelain-metal interfaces of the nichrome primary copings margins were observed through a scanning electron microscope (SEM). RESULTS:In 120 hours' continual observation, none of the specimens had porcelain coating fractures or scraping occurrence and all of the porcelain coatings had been kept intact under sinusoidal cyclic loading with the load range of 120 - 200 N and frequency of 5 Hz. CONCLUSIONS:Auro-galvanoforming ceramic bridges exhibited excellent fatigue strength in the fatigue cyclic loading test and may satisfy the clinical demand in theory, while the practical application shall be evaluated by observations in long-term clinical usage.
journal_name
Chin Med J (Engl)journal_title
Chinese medical journalauthors
Zhang XH,Sun F,Wang H,Xu MQsubject
Has Abstractpub_date
2008-10-05 00:00:00pages
1896-9issue
19eissn
0366-6999issn
2542-5641journal_volume
121pub_type
杂志文章abstract:BACKGROUND:The evoked electromyography (EMG) is frequently used to identify facial nerve in order to prevent its damage during surgeries. Partial neuromuscular blockade (NMB) has been suggested to favor EMG activity and insure patients' safety. The aim of this study was to determine an adequate level of NMB corresponde...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2009-02-05 00:00:00
abstract:: ...
journal_title:Chinese medical journal
pub_type: 信件
doi:10.4103/0366-6999.243565
更新日期:2018-10-20 00:00:00
abstract:BACKGROUND:Orthotopic liver transplantation (OLT) has become the therapeutic option of choice for end-stage liver disease. The aim of this study was to investigate the changes of splenic morphology, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), apparent diffusion coefficient (ADC) values and explore their...
journal_title:Chinese medical journal
pub_type: 杂志文章,随机对照试验
doi:
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:Congenital uterine anomalies are associated with the highest incidence of reproductive failure and obstetric complications. This study aimed to summarize the clinical characteristics and prenatal outcome of pregnancy in women with congenital uterine malformations. METHODS:This retrospective study evaluated ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2010-02-20 00:00:00
abstract:BACKGROUND:Patients with elevated admission glucose levels may be at increased risk of death after myocardial infarction, independent of other baseline risk factors and more severe coronary artery disease. However, data regarding admission glucose and epicardial and microvascular flow after primary angioplasty is limit...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2006-01-20 00:00:00
abstract:BACKGROUND:Few clinical studies or randomized clinical trial results have reported the impact of fast track surgery on postoperative insulin sensitivity. This study aimed to investigate the effects of fast track surgery on postoperative insulin sensitivity in patients undergoing elective open colorectal resection. MET...
journal_title:Chinese medical journal
pub_type: 杂志文章,随机对照试验
doi:
更新日期:2012-09-01 00:00:00
abstract::Injections of serotonin (5-HT) into the aortic arch of rats caused greater reductions of blood pressure (BP) and less increases in renal vascular resistance (RVR) than that into jugular veins, in contrast to norepinephrine (NE) which tended to cause larger increases in BP and RVR by the intra-aortic route. Indomethaci...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1989-06-01 00:00:00
abstract:BACKGROUND:Neutrophil/lymphocyte ratio (NLR) has been proposed as a novel marker of systemic inflammation and oxidative stress. The objective of this study was to ascertain the relationship between levels of NLR and recurrence of lone atrial fibrillation (AF) after catheter ablation. METHODS:A total of 379 lone AF pat...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:The Xpert MTB/RIF showed high sensitivity and specificity in previous studies carried out in different epidemiological and geographical settings and patient populations in high-burden tuberculosis (TB) countries. However, there were little data obtained by validation or demonstration study of the assay in Ch...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:Wolf-Hirschhorn syndrome (WHS) is a contiguous gene syndrome that is typically caused by a deletion of the distal portion of the short arm of chromosome 4. However, there are few reports about the features of Chinese WHS patients. This study aimed to characterize the clinical and molecular cytogenetic featur...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.177996
更新日期:2016-03-20 00:00:00
abstract:BACKGROUND:Connective tissue growth factor (CTGF) contributes greatly to renal tubulointerstitial fibrosis, which is the final event leading to end-stage renal failure. This study was designed to investigate the effects of CTGF antisense oligodeoxynucleotides (ODNs) on the expressions of plasminogen activator inhibitor...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2004-07-01 00:00:00
abstract:OBJECTIVE:To evaluate the clinical value of sequential subtraction scintigraphy (SSS) with 99mTc red blood cell (RBC) for the early detection of gastrointestinal (GI) bleeding. METHODS:Ninety patients referred with clinical evidence of GI bleeding underwent 99mTc-RBC scintigraphy with digital gamma camera after labeli...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2001-01-01 00:00:00
abstract:BACKGROUND:Congenital heart disease (CHD) is a common heart condition which does considerable harm to the health of children and adolescents. CHD epidemiological characteristics of Tibetan children whose ages ranged from 4 to 18 years were investigated in Qinghai Province. METHODS:A total of 32 578 Tibetan children, l...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2008-12-20 00:00:00
abstract:OBJECTIVE:To explore the effects of ultrafiltration technique in preventing and relieving pulmonary injury in children undergoing open heart surgery and cardiopulmonary bypass (CPB). METHODS:Thirty cases with congenital heart defects were divided into a control group and an experimental group. In the control group, co...
journal_title:Chinese medical journal
pub_type: 临床试验,杂志文章
doi:
更新日期:2003-10-01 00:00:00
abstract:BACKGROUND:Both cortical and cortical-subcortical (cortex-involved) lesions are typically associated with embolic stroke, of which atrial fibrillation (AF) is the common cause. The aim of this study was to find out the associations between cortex-involved stroke, vascular risk factors, and the subtypes (discovery time ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.1097/CM9.0000000000000390
更新日期:2019-09-05 00:00:00
abstract:BACKGROUND:Whether antibody to myelin oligodendrocyte glycoprotein (MOG) can be a diagnostic marker for multiple sclerosis (MS) is still controversial. Recent studies suggested that serum specific anti-MOG epitope antibody might be an MS specific marker. However, these studies did not include neuromyelitis optica (NMO)...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2012-09-01 00:00:00
abstract:OBJECTIVE:To determine the relationship between remodeling and dysfunction of left ventricle (LV) and the expression of the angiotensin II AT1 receptor mRNA after myocardial infarction (MI) in rats. METHODS:Nine MI rats (Group A) and 8 sham-operated rats (Group B) were studied by both Doppler echocardiography and Dot ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1999-07-01 00:00:00
abstract::From 1949 through 1978, 31 patients with renal metastasis were diagnosed in a total of 448 cases of choriocarcinoma admitted to our hospital, giving an incidence of 6.9%. Renal metastasis was invariably preceded by pulmonary metastases and usually accompanied by other visceral metastases, indicating that renal metasta...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1991-09-01 00:00:00
abstract:BACKGROUND:MicroRNAs (miRNAs) contribute to tumorigenesis by acting as either oncogenes or tumor suppressor genes. In this study, we investigated the role of miR-145 in the pathogenesis of uveal melanoma. METHODS:Expression profiles of miRNAs in uveal melanoma were performed using Agilent miRNA array. Quantitative rea...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:Cesarean scar pregnancy (CSP) is a very rare but life-threatening entity and there is no optimal management strategy. Here we report a successfully conservative treatment of CSP. METHODS:We retrospectively analyzed the clinical data of 54 women with CSP, who underwent uterine artery embolization between Jan...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:The molecular mechanisms of Shenxianshengmai (SXSM), a traditional Chinese medicine, on bradycardia have been incompletely understood. The study tried to investigate the gene expression profile and proteomics of bradycardia rabbits' hearts after SXSM treatment. METHODS:Twenty-four adult rabbits were randoml...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.197999
更新日期:2017-01-20 00:00:00
abstract::1 141 serum samples from various population groups in north China were examined for C100-3Ab by ELISA. Antibody to C100-3 antigen derived from HCV genome (C100-3A) and HBsAg were measured in 438 normal population in Beijing. The C100-3Ab positive rate was 2.1% and the HBsAg positive rate was 2.5%. There is increased o...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1992-03-01 00:00:00
abstract:OBJECTIVE:This review focuses on the role of the large conductance calcium-activated potassium (BKCa) channels in diabetic vascular complications. DATA SOURCES:Relevant articles published in English or Chinese from 1981 to present were selected from PubMed. The search terms were "BKCa channels" and "diabetes". Importa...
journal_title:Chinese medical journal
pub_type: 杂志文章,评审
doi:
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:Gender is one of the risk factors accounting for the high prevalence of adolescent myopia. Considerable research results have shown that myopia incidence of female is higher than that of male. This study aimed to analyze the correlation between ocular parameters and serum estrogen level and to investigate th...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.151669
更新日期:2015-03-05 00:00:00
abstract:BACKGROUND:Volatile anesthetics (VAs) may affect varied and complex physiology processes by manipulating Ca(2+)-calmodulin (CaM). However, the detailed mechanism about the action of VAs on CaM has not been elucidated. This study was undertaken to examine the effects of VAs on the conformational change, hydrophobic site...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2012-09-01 00:00:00
abstract::Sepsis is defined as life-threatening organ dysfunction caused by a dysregulated host response to infection. The heart is one of the most important oxygen delivery organs, and dysfunction significantly increases the mortality of the body. Hence, the heart has been studied in sepsis for over half a century. However, th...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.1097/CM9.0000000000000929
更新日期:2020-09-20 00:00:00
abstract:OBJECTIVE:To analyze the relationship between the proto-oncogene c-fos change and neuronal degeneration in the hippocampus of the patients with Alzheimer's disease. METHODS:The post mortem human hippocampal tissues were divided into three groups, namely, the aged, the young and Alzheimer's disease (AD) groups. Each gr...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1998-01-01 00:00:00
abstract:: ...
journal_title:Chinese medical journal
pub_type: 社论
doi:10.4103/0366-6999.247217
更新日期:2018-12-20 00:00:00
abstract:BACKGROUND:Methylmalonic acidemia (MMA) is a multifactorial autosomal recessive inborn error of organic acid metabolism, often presenting with neurological symptoms. As neurological disorders are often related to white matter injury, diffusion tensor imaging (DTI) is an excellent tool for assessment of white matter inj...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2009-04-20 00:00:00
abstract:BACKGROUND:The effectiveness of neoadjuvant chemoradiotherapy (NCRT) treatment for patients with esophageal carcinoma (EC) remains controversial. The aim of this study was to compare the effect of NCRT followed by surgery (NCRTS) with surgery alone (SA) for EC. METHODS:The PubMed, EMBASE, and the Cochrane Library data...
journal_title:Chinese medical journal
pub_type: 杂志文章,meta分析
doi:10.4103/0366-6999.195464
更新日期:2016-12-20 00:00:00