Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Prosthesis Coloring”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,333 records · Page 74Linked to original sources
PubMed2003

How direct bonding satisfies an esthetic need.

The patient was more than satisfied with his appearance and with the cost of the procedure. After the wedding, he was ready to begin a more conventional series of treatments with orthodontia. Within the past several years, we have significantly progressed in our ability to provide complete in-office, long-term comprehensive dentistry. This article was written to help dentists visualize the potential of both materials and techniques for direct, in-mouth restorative dentistry. As more composites or composite replacement materials become available, practitioners will learn to perform direct-placement techniques even more skillfully. The majority of patients appear to covet white, bright teeth--sometimes to a degree that is beyond their normal color. This patient was no different. As a dentist, I have learned to give in to patients' demands. After all, it is their teeth.

Adult↗
PubMed2005

Internal iliac artery coil embolization in the prevention of potential type 2 endoleak after endovascular repair of abdominal aortoiliac and iliac artery aneurysms: effect of total occlusion versus residual flow.

PURPOSE: To evaluate whether the presence of type 2 endoleak after internal iliac artery (IIA) coil embolization in patients with residual antegrade flow through the coils is more frequent than in patients who presented with total occlusion of the IIA after embolization. MATERIALS AND METHODS: Records were reviewed of 45 patients who underwent unilateral (n = 37) or bilateral (n = 8) IIA coil embolization between 1998 and 2004 for endovascular repair of aortoiliac aneurysms (n = 32), iliac artery aneurysms (n = 12), pseudoaneurysm (n = 1), or distal type 1 endoleak after placement of an aortoiliac stent-graft (n = 8). A total of 53 IIAs were embolized by means of coils and/or microcoils. Computed tomography (CT) was used for follow-up in 40 patients, angiography was used in three, and color Doppler ultrasonography was used in three. RESULTS: At the end of the embolization procedure, 23 IIAs were occluded and 30 IIAs demonstrated residual antegrade flow through the coils. Control CT demonstrated two type 2 endoleaks after endovascular stent-graft placement resulting from retrograde blood flow into the left IIA main branch via a patent iliolumbar artery. One of these two patients showed residual antegrade flow through the coils at the end of the IIA embolization procedure, and the other patient underwent complete coil embolization of the ostia of the anterior and posterior division but not of the main trunk of an aneurysmal IIA. CONCLUSION: IIA coil embolization with residual antegrade flow through the coils causes no greater incidence of type 2 endoleak after aortoiliac or iliac stent-graft placement. However, care must be taken in case of a proximal postostial origin of the iliolumbar artery on the IIA, which may cause type 2 endoleak if not embolized.

Aged↗
PubMed1996

Processed bovine pericardium as patch angioplasty for carotid endarterectomy: a preliminary report.

Although the routine use of a patch for closure of the arteriotomy after carotid endarterectomy is still debated, patch angioplasty is frequently used to avoid residual stenosis and to lower the incidence of later restenosis. Several materials are widely used for carotid patching, notably, autologous vein, Dacron and polytetrafluorethylene (PTFE). During recent years a heterologous stabilized graft made from bovine pericardium has been introduced. This paper reports the authors' experience of 52 carotid endarterectomies in which a patch of bovine pericardium was used to close the arteriotomy. The patients were followed with colour-duplex scanning over 12-30 months. This biograft did not require preclotting and proved to be easy to suture. Follow-up did not uncover any complications related to graft use. Although this is a preliminary report, it is concluded that bovine pericardium is a promising material for carotid patch angioplasty.

Animals↗
PubMed1996

Processed bovine pericardium as patch angioplasty for carotid endarterectomy: a preliminary report.

Although the routine use of a patch for closure of the arteriotomy after carotid endarterectomy is still debated, patch angioplasty is frequently used to avoid residual stenosis and to lower the incidence of later restenosis. Several materials are widely used for carotid patching, notably, autologous vein, Dacron and polytetrafluorethylene (PTFE). During recent years a heterologous stabilized graft made from bovine pericardium has been introduced. This paper reports the authors' experience of 52 carotid endarterectomies in which a patch of bovine pericardium was used to close the arteriotomy. The patients were followed with colour-duplex scanning over 12-30 months. This biograft did not require preclotting and proved to be easy to suture. Follow-up did not uncover any complications related to graft use. Although this is a preliminary report, it is concluded that bovine pericardium is a promising material for carotid patch angioplasty.

Animals↗
PubMed1999

[Percutaneous closure of ostium secundum atrial septal defects using the Amplatz device. Preliminary study on 29 patients].

The aim of the study was to assess the results of percutaneous closure of ostium secundum atrial septal defects (ASD) by the Amplatz device and to compare them with those obtained by other methods. Over a one year period, closure of ASD was performed in 28 patients aged 7 to 66 years (mean of 32 years) with exclusive left-to-right shunts. The selection of patients was made by transthoracic echocardiography. Cardiac catheterisation was performed to measure the stretched diameter of the defect. After patient or parental consent, the procedure was performed under general anaesthesia. The implantation was performed under transoesophageal echocardiographic control. The diameter of the Amplatz device corresponded to the stretched diameter of the ASD. The patients were discharged from hospital 48 hours later under platelet anti-aggregant therapy for 6 months. Clinical, electrocardiographic, radiological and echocardiographic examinations were performed at 1 month, 3 months and 1 year after implantation. The stretched diameter was 12-27 mm (mean 22 mm). The device was withdrawn in one case because of a double ASD and, in another patient, failure was due to embolisation of the obturator to the pulmonary artery before its implantation. The closure was complete in 21 of the 26 cases immediately after the procedure; at one month, two residual shunts were observed but they had disappeared at 3 months and at 1 year. Out of 46 ASD closed by the Sidéris button prosthesis, occlusion was total in 29 cases and partial in 17 cases. The authors conclude that the Amplatz device is an effective prosthesis for closure of ostium secundum ASD. With strict selection procedures, the results are excellent.

Adolescent↗
PubMed2000

Peripheral arterial obstruction: prospective study of treatment with a transluminally placed self-expanding stent-graft. International Trial Study Group.

PURPOSE: To evaluate the safety and efficacy of an endoluminal prosthesis for treatment of peripheral arterial occlusive disease (PAOD). MATERIALS AND METHODS: A self-expanding endoprosthesis with an expanded polytetrafluoroethylene tube inside a nitinol support structure was implanted in 127 patients with symptomatic PAOD in the iliac (61 limbs) and femoral arteries (80 limbs). Clinical category status, ankle-brachial index, and color duplex flow imaging results were recorded before treatment, at discharge, and at 1, 3, 6, and 12 months after treatment. Aspirin was administered throughout the study, and heparin was administered during and for 2 days after the procedure. RESULTS: Endoprosthesis deployment was technically successful in all patients. Complications occurred in 24 of 141 procedures and included three major complications. Early thrombosis (within 30 days) occurred in one iliac and three femoral arteries. Late restenosis or reocclusion was observed in five iliac and 14 femoral arteries within the 1st year. Primary patency rates in iliac arteries were 98% +/- 3% (standard error) and 91% +/- 4%, respectively, at 6 and 12 months after treatment. Primary patency rates in femoral arteries were 90% +/- 3% and 79% +/- 5%, respectively, at 6 and 12 months. Secondary patency rates were 95% and 93% for iliac and femoral arteries, respectively, at 12 months after treatment. CONCLUSION: The device used in this study can be implanted without additional risks to the patient and provided encouraging patency rates up to 1 year.

Adult↗
PubMed1995

Assessment of feasibility for endovascular prosthetic tube correction of aortic aneurysm.

Abdominal aortic aneurysm (AAA) can now be corrected by perfemoral introduction of a prosthetic tube graft with fixation using expandable metal stents. This technique requires a satisfactory iliac system, through which the graft can reach its destination, and suitable lengths of non-aneurysmal aorta below the renal arteries and above the aortic bifurcation for stent attachment. The feasibility for placement of endovascular grafts was assessed in 44 consecutive patients admitted for transabdominal AAA repair. The proximal and distal aneurysmal necks and the iliac arteries were assessed before operation by colour flow Doppler ultrasonography (duplex scanning), computed tomography and intravenous digital subtraction angiography, using intraoperative measurements as the 'gold standard'. At operation 32 of 44 patients had a suitable proximal neck and five of 44 a suitable distal neck for endovascular grafting. Duplex scanning was the most accurate modality for preoperative assessment of the aneurysm necks. According to this technique 32 of 44 patients had a satisfactory iliac system for introduction of an endovascular graft. Overall only four of 44 patients were considered suitable for endovascular correction of AAA using a tube graft-stent combination.

Aged↗
PubMed2003

Clinical and Doppler ultrasonography data of a polyurethane vascular access graft for haemodialysis: a prospective study.

BACKGROUND: Absence of a permanent vascular access in most patients starting haemodialysis remains a cause of high morbidity and costs. This study obtained new clinical and colour Doppler ultrasound (CDU) data of a polyurethane vascular access graft (PVAG) proposing early post-operative cannulation. METHODS: Baseline characteristics were determined in 15 patients and the PVAGs were evaluated prospectively including first cannulation, patency and complications. CDU was used post-operatively and after 1 year for assessing graft morphology and access blood flow. RESULTS: PVAGs were cannulated at a median of 4 days post-operatively. The 1-year primary patency of the PVAG was 66.7%. During the 15 months observation three grafts thrombosed, one was replaced because of infection and one because of ischaemia. CDU measurements at the feeding brachial artery revealed a mean initial access volume flow of 773+/-89 ml/min, being significantly higher in patients without thrombosis compared to patients with thrombotic events (930+/-90 vs 375+/-143 ml/min, P<0.05). The initial inability to directly monitor PVAGs by CDU changed at sites of frequent centesis, where Doppler signals and luminal morphology could be evaluated in the follow up examination. CONCLUSIONS: The PVAG offers early access for urgent haemodialysis. CDU for access volume flow measurement at the feeding brachial artery contributes to predict access thrombosis. Direct non-invasive graft imaging is limited and the ultrasonographical changes in the polyurethane material enabling graft monitoring after repeated cannulation might indicate an injury of the graft with increased risk for access failure.

Adult↗
PubMed2003

Vertebral artery origin angioplasty and primary stenting: safety and restenosis rates in a prospective series.

OBJECTIVES: To report a single centre ongoing experience of endovascular treatment for atherosclerotic vertebral artery origin stenosis in a series of symptomatic patients, with follow up imaging to determine the incidence of restenosis. METHODS: 14 patients with vertebral artery origin stenosis on catheter angiography were treated. Angioplasty without stenting was undertaken in the first four patients, all of whom had follow up catheter angiography at one year. Subsequently, patients were treated by primary stenting and followed up with colour Doppler ultrasound examination. RESULTS: The procedure was technically successful in all treated arteries, with no immediate complications. The degree of stenosis was reduced from (mean (SD)) 73 (18)% before treatment to 21 (26)% immediately after treatment in the angioplasty alone group (p = 0.059). In the primary stenting patients, the severity of stenosis was reduced from 82 (8)% to 13 (13)% immediately after treatment (p < 0.001). Restenosis to 70% or greater occurred at one year in all four patients initially treated by angioplasty without stenting. One patient subsequently developed further symptoms and was retreated by stenting. One of the 10 patients treated by primary stenting developed restenosis. None of the remaining patients had further posterior circulation ischaemic symptoms during a mean follow up period of 33.6 months (range 1 to 72 months). CONCLUSIONS: Restenosis occurs often after vertebral artery origin balloon angioplasty without stenting but is uncommon after stenting. Primary stenting is therefore recommended to maintain patency at this site, and had a low complication rate in this series.

Adult↗
PubMed1993

Transesophageal color flow Doppler features of aorta to right ventricle fistula.

A patient developed aortic-to-right ventricular fistula after aortic valve replacement surgery and infective endocarditis. The fistula was not detected by transthoracic two-dimensional echocardiography and color flow Doppler. The transesophageal study, however, was instrumental in diagnosing this entity and prompting surgical resection of the fistula.

Aortic Diseases↗
PubMedDate not supplied

In vitro evaluation of a stentless porcine aortic bioprosthesis. A preliminary study.

Currently available aortic bioprosthetic heart valves are all relatively suboptimal due to the constraints placed on leaflets by stenting. The constraints on the stenting mechanism may directly or indirectly cause turbulence in the orifice neighborhood, be nidi of tissue calcification, and impart transleaflet stress differentials. To address all these deficiencies, we undertook the development of a stentless porcine aortic bioprosthesis (SPAB). This study evaluates the hemodynamic performance and durability of this design in special chambers with near physiologic compliance. The results are compared to those shown by a stented porcine aortic bioprosthesis. The pressure measurements under steady flow conditions showed that the hemodynamic performance (including pressure gradient and effective orifice area) of SPAB is superior to that of its stented counterpart, especially in the smaller sizes. In addition, it is expected that this stentless design should minimize the mechanical stress to which the leaflets are subjected throughout the cardiac cycle, thus enhancing the durability of the bioprosthesis. In our accelerated durability study for up to 2 equivalent years, no valve failure has been observed. More in vitro studies under pulsatile flow conditions, including color Doppler flow visualization, are currently being conducted.

Aortic Valve↗
PubMed1979

Repair of porcelain-fused-to-metal restorations.

Three techniques have been described which may be used to repair many porcelain-fused-to-metal restorations. These techniques provide an avenue of repair for extensive porcelain-fused-to-metal restorations without remaking the entire prosthesis. The success of the overlay and pin-retained ceramo-metal repairs should be comparable to that of a newly constructed porcelain-fused-to-metal restoration. The composite resin bonded to porcelain repair technique will not have as favorable a prognosis, as composite resins are more subject to wear and are not color stable, and the chemical bond created with silance bonding agents is much weaker than the bond created when porcelain is fused to metal. Success of silance-bonded repairs should not be expected for periods longer than 2 to 3 years.

Composite Resins↗
PubMed2001

Decreased recurrent carotid stenosis by routine patching and intraoperative scanning.

Our objective was to review the results of carotid endarterectomies (CEAs) with Dacron patch angioplasty and intraoperative color-flow duplex scanning (CFS). In a 3-year period, patients who underwent CEA with Dacron patch angioplasty and intraoperative CFS were studied. We excluded patients who had primary closure, vein patch, and redo endarterectomy. Serial CFS was obtained first in the early postoperative period (one day to 3 weeks), then at 6 months, and then yearly. Intraoperative CFS abnormalities were classified as major, requiring immediate revision, or minor, which were observed. The diagnosis of recurrent stenosis by US was based on the detection of an increased peak systolic frequency (>8000 MHz) or velocity (>250 cm/second) in the internal carotid artery. There were 212 CEAs performed in 200 patients (128 men and 84 women) included in this study. Three patients (1.4%) awoke with a stroke, two (0.94%) had transient ischemic attacks, and three (1.4%) developed transient hypoglossal nerve paresis. Intraoperative CFS showed a major defect that required an immediate revision in six patients (2.8%). Minor abnormalities were detected in another 41 patients (19.3%), but no revision was necessary. In follow-up three patients were identified with a severe recurrent carotid stenosis (>80%) and they underwent redo CEA. This rate of recurrence (1.4%) is significantly lower than the rate we had previously reported in a larger study (82 of 1209, 6.8%; P = 0.003). We conclude that the combined use of Dacron patch angioplasty and intraoperative CFS after CEA is associated with a low perioperative morbidity and a low incidence of recurrent stenosis in the first 2 years after operation.

Aged↗
PubMed2003

Macrophages at the skeletal tissue-device interface of loosened prosthetic devices express bone-related genes and their products.

Aseptic loosening of prosthetic arthroplasty is the most common reason for implant failure in adult orthopaedic reconstruction. At the interface of aseptic loosened prostheses, there is an abundance of particle-activated macrophages and other inflammatory cells. The role of these particle-laden macrophages in the osteogenic arm of the remodeling skeleton in this pathological condition is poorly understood. Molecular signaling by mesenchymal cells and mononuclear inflammatory cells residing in the interfacial tissues between bone and cement or prosthetic material of aseptically loosened joint prostheses was studied using in situ hybridization and immunohistochemical techniques. We found that a range of collagenous and noncollagenous matrix proteins, including osteopontin, osteocalcin, bone sialoprotein, and type I collagen, were produced in the periprosthetic tissue by foamy macrophages, as well as nearby osteogenic cells. The former accumulated in profusion in the three zones of interfacial tissues: pseudomembranous, fibrous, and osseous. Spindle mesenchymal cells in the fibrous zone failed to express any of the osteogenic mRNAs or proteins sought. The expression of bone-related genes and proteins by foamy macrophages at the interface of an aseptic loosened prosthesis may contribute to the disturbance of bone remodeling at this site.

Adult↗
PubMed1985

Effective measures to reduce xylene exposure.

Several effective measures to reduce xylene exposure of clinicians during the extrinsic coloring of facial prostheses have been described. These measures can be used to modify the xylene exposure problem until an adequate ventilation system can be installed in the treatment room.

Environmental Exposure↗
PubMed1997

Intraoperative and early postoperative colour Doppler sonography after carotid artery reconstruction: follow-up of technical defects.

We studied 50 patients with intraoperative colour-coded Doppler sonography (CCDS) after carotid artery reconstruction. Technical defects could be detected in 19 cases (38 %): residual plaques in 9, flaps in 8 and strictures in 2. In 9 cases (18 %) the carotid endarterectomy was revised. One residual plaque and one residual stricture caused thrombosis at the operative site a few hours postoperatively. One of the patients with residual plaques developed a high-grade stenosis within the follow-up period. Of the patients with residual plaques two had a medium-grade stenosis at follow-up. Six flaps decreased in size or disappeared within 1 week after operation. No patient with a flap developed a stenosis within the follow-up period. Our findings seem to indicate that correction of intimal flaps less than 10 mm in size is not necessary.

Aged↗