Investigation of Aged Dispersion Ceramics by Means of Hip Simulator

2007 ◽  
Vol 361-363 ◽  
pp. 771-774 ◽  
Author(s):  
Thomas Oberbach ◽  
Sabine Begand ◽  
Wilfried Glien ◽  
Christian Kaddick
Keyword(s):  
Life Expectancy ◽  
Ceramic Materials ◽  
Alumina Ceramic ◽  
Zirconia Ceramic ◽  
Tribological Behaviour ◽  
Artificial Joints ◽  
Hip Simulator ◽  
Zirconia Toughened Alumina ◽  
Ceramic On Ceramic

Wear of hip implants is a significant problem for the life expectancy of artificial joints. By using alumina ceramic on ceramic couplings the wear can be decreased. But for further improvement of the safety of THR the aim is the development of new ceramic materials. For orthopaedic applications an Alumina Toughened Zirconia Ceramic ATZ (80% ZrO2-20%Al2O3) and a Zirconia Toughened Alumina ZTA (25% ZrO2-75%Al2O3) were tested regarding their tribological behaviour by means of hip simulator testing after hydrothermal treatment. The absolute wear amount for the aged samples after 5 million cycles is slightly increased on a very low level, but even less wear than for common alumina pairings. In consideration of these excellent results both dispersion ceramics are highly suitable for long term applications.

Surface Resistance of Dispersion Ceramics against Third Body Abrasion

2008 ◽  
Vol 396-398 ◽  
pp. 161-164 ◽  
Author(s):  
Thomas Oberbach ◽  
Sabine Begand ◽  
Christian Kaddick
Keyword(s):  
Alumina Ceramic ◽  
Wear Behaviour ◽  
Third Body ◽  
Worst Case ◽  
Artificial Joints ◽  
Joint Gap ◽  
Hip Joint Simulator ◽  
Zirconia Toughened Alumina ◽  
Ceramic On Ceramic

Wear of the articulation partners in artificial joints for hip or knee is known to influence the in vivo survival rate of the implants. Wear amount can be strongly increased if third body wear occurs in the joint gap. Alumina ceramic is noted for a good wear resistance even under these worst case conditions. We tested the wear behaviour of the new dispersion ceramics ZTA (Zirconia Toughened Alumina) and ATZ (Alumina Toughened Zirconia) in comparison to alumina for the couplings ceramic on PE and ceramic on ceramic in a hip joint simulator in presence of third body particles.

The Characteristics of the New Ceramic Material for Artificial Joints

2006 ◽  
Vol 309-311 ◽  
pp. 1235-1238 ◽  
Author(s):  
Takefumi Nakanishi ◽  
Kunihide Shikata ◽  
Yu Cong Wang ◽  
Mikio Iwamoto ◽  
Makoto Kondo
Keyword(s):  
Fracture Toughness ◽  
Phase Stability ◽  
Crystalline Phase ◽  
Hip Replacement ◽  
Alumina Ceramic ◽  
Artificial Joints ◽  
Hip Prostheses ◽  
Artificial Hip ◽  
Zirconia Toughened Alumina ◽  
Ceramic On Ceramic

A new zirconia-toughened alumina ceramic (JMM-ZTA) for a ceramic-on-ceramic hip replacement has been developed. The JMM-ZTA has a fracture toughness superior to zirconia, and the JMM-ZTA/JMM-ZTA combination has superior wear-resistant performance to alumina/alumina. Moreover, the JMM-ZTA shows an excellent crystalline phase stability. Therefore, the JMM-ZTA is believed to be useful for artificial hip prostheses.

scholarly journals Dilemmas in zirconia bonding: A review

2013 ◽  
Vol 141 (5-6) ◽  
pp. 395-401 ◽  
Author(s):  
Kosovka Obradovic-Djuricic ◽  
Vesna Medic ◽  
Slobodan Dodic ◽  
Dragan Gavrilov ◽  
Djordje Antonijevic ◽  
...  
Keyword(s):  
Bond Strength ◽  
Glass Ceramics ◽  
Ceramic Materials ◽  
The Other ◽  
Zirconia Ceramic ◽  
Bonding Mechanism ◽  
Luting Cements ◽  
Esthetic Dentistry ◽  
Selection Of

This article presents a literature review on the resin bond to zirconia ceramic. Modern esthetic dentistry has highly recognized zirconia, among other ceramic materials. Biocompatibility of zirconia, chemical and dimensional stability, excellent mechanical properties, all together could guarantee optimal therapeutical results in complex prosthodontic reconstruction. On the other hand, low thermal degradation, aging of zirconia as well as problematic bonding of zirconia framework to dental luting cements and tooth structures, opened the room for discussion concerning their clinical durability. The well known methods of mechanical and chemical bonding used on glass-ceramics are not applicable for use with zirconia. Therefore, under critical clinical situations, selection of the bonding mechanism should be focused on two important points: high initial bond strength value and long term bond strength between zirconia-resin interface. Also, this paper emphases the use of phosphate monomer luting cements on freshly air-abraded zirconia as the simplest and most effective way for zirconia cementation procedure today.

Ceramic-On-Ceramic Implants in Total Hip Arthroplasty

2005 ◽  
Vol 284-286 ◽  
pp. 1003-1006
Author(s):  
Clifford W. Colwell ◽  
J.A. D'Antonio ◽  
W.N. Capello ◽  
M.E. Hardwick
Keyword(s):  
Ceramic Materials ◽  
Clinical Results ◽  
Alumina Ceramic ◽  
Harris Hip Score ◽  
X Rays ◽  
Cobalt Chromium ◽  
Ceramic Implants ◽  
Receive System ◽  
Clinical And Radiological Results ◽  
Ceramic On Ceramic

Alumina ceramic is an excellent material for biologic implantation. Decreased particulate wear debris should increase implant longevity. The purpose of this study is to examine clinical and radiological results of ceramic-on-ceramic hip implants compared to cobalt chrome on polyethylene. Four cementless systems were compared, three alumina-on-alumina bearing systems: System I, porous coated cup; System II, hydroxyapatite-coated cup; Trident system, hydroxyapatite-coated cup with metal sleeve backing on ceramic cup liner; and System III (control), porous-coated cup with polyethylene and cobalt chromium bearing system. Patients were randomized to receive System I, II, or III. Trident patients were not randomized. Examinations are performed at 6 months, 1 year and yearly thereafter including x-rays, clinical exam and Harris Hip Score (HHS). Minimum 24-month followup was performed in 562 ceramic hips and 154 control hips. Age, height, weight, gender and diagnosis were similar in all groups. HHS was rated good/excellent by 95 percent of ceramic hips and 97 percent of control hips. Radiographic results demonstrated radiolucency in Femoral Gruen Zone 1 in 3.8 percent (18/474) of ceramic hips and in 8 percent (10/128) of control hips. Unstable acetabular components were reported in none of ceramic hips and in 3.2 percent (5/154) of control hips. Revision was performed in 7 (1.2 percent) ceramic hips, none due to failure of ceramic materials, and in 9 (5.8 percent) control hips. Alumina ceramic materials show promise, but continued evaluation of long-term clinical results is needed.

scholarly journals Alumina-on-Polyethylene Bearing Surfaces in Total Hip Arthroplasty

2010 ◽  
Vol 4 (1) ◽  
pp. 56-60 ◽  
Author(s):  
Jung Yup Lee ◽  
Shin-Yoon Kim
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Polyethylene Wear ◽  
Alumina Ceramic ◽  
Total Hip ◽  
Advantages And Disadvantages ◽  
Hip Simulator ◽  
Simulator Study

The long-term durability of polyethylene lining total hip arthroplasty (THA) mainly depends on periprosthetic osteolysis due to wear particles, especially in young active patients. In hip simulator study, reports revealed significant wear reduction of the alumina ceramic-on-polyethylene articulation of THA compared with metal-on-polyethylene bearing surfaces. However, medium to long-term clinical studies of THA using the alumina ceramic-on-polyethylene are few and the reported wear rate of this articulation is variable. We reviewed the advantages and disadvantages of ceramicon- polyethylene articulation in THA, hip simulator study and retrieval study for polyethylene wear, in vivo clinical results of THA using alumina ceramic-on-polyethylene bearing surfaces in the literature, and new trial alumina ceramic-onhighly cross linked polyethylene bearing surfaces.

Strengthening of occupational health promotion by the German Prevention Health Care Act

2019 ◽  
pp. 188-190
Author(s):  
Diana Hart
Keyword(s):  
Public Health ◽  
Health Care ◽  
Health Promotion ◽  
Primary Prevention ◽  
Occupational Health ◽  
Life Expectancy ◽  
Prevention And Control ◽  
Occupational Health Promotion ◽  
And Control

All countries are faced with the problem of the prevention and control of non-communicable diseases (NCD): implement prevention strategies eff ectively, keep up the momentum with long term benefi ts at the individual and the population level, at the same time tackling hea lth inequalities. Th e aff ordability of therapy and care including innovative therapies is going to be one of the key public health priorities in the years to come. Germany has taken in the prevention and control of NCDs. Germany’s health system has a long history of guaranteeing access to high-quality treatment through universal health care coverage. Th r ough their membership people are entitled to prevention and care services maintaining and restoring their health as well as long term follow-up. Like in many other countries general life expectancy has been increasing steadily in Germany. Currently, the average life expectancy is 83 and 79 years in women and men, respectively. Th e other side of the coin is that population aging is strongly associated with a growing burden of disease from NCDs. Already over 70 percent of all deaths in Germany are caused by four disease entities: cardiovascular disease, cancer, chronic respiratory disease and diabetes. Th ese diseases all share four common risk factors: smoking, alcohol abuse, lack of physical activity and overweight. At the same time, more and more people become long term survivors of disease due to improved therapy and care. Th e German Government and public health decision makers are aware of the need for action and have responded by initiating and implementing a wide spectrum of activities. One instrument by strengthening primary prevention is the Prevention Health Care Act. Its overarching aim is to prevent NCDs before they can manifest themselves by strengthening primary prevention and health promotion in diff erent sett ings. One of the main emphasis of the Prevention Health Care Act is the occupational health promotion at the workplace.

scholarly journals Long-term survival benefit of ramipril in patients with acute myocardial infarction complicated by heart failure

Heart ◽  
2021 ◽  
Vol 107 (5) ◽  
pp. 389-395
Author(s):  
Jianhua Wu ◽  
Alistair S Hall ◽  
Chris P Gale
Keyword(s):  
Myocardial Infarction ◽  
Heart Failure ◽  
Acute Myocardial Infarction ◽  
Life Expectancy ◽  
Survival Benefit ◽  
Ace Inhibition ◽  
Survival Times ◽  
Term Survival ◽  
Long Term Survival

AimsACE inhibition reduces mortality and morbidity in patients with heart failure after acute myocardial infarction (AMI). However, there are limited randomised data about the long-term survival benefits of ACE inhibition in this population.MethodsIn 1993, the Acute Infarction Ramipril Efficacy (AIRE) study randomly allocated patients with AMI and clinical heart failure to ramipril or placebo. The duration of masked trial therapy in the UK cohort (603 patients, mean age=64.7 years, 455 male patients) was 12.4 and 13.4 months for ramipril (n=302) and placebo (n=301), respectively. We estimated life expectancy and extensions of life (difference in median survival times) according to duration of follow-up (range 0–29.6 years).ResultsBy 9 April 2019, death from all causes occurred in 266 (88.4%) patients in placebo arm and 275 (91.1%) patients in ramipril arm. The extension of life between ramipril and placebo groups was 14.5 months (95% CI 13.2 to 15.8). Ramipril increased life expectancy more for patients with than without diabetes (life expectancy difference 32.1 vs 5.0 months), previous AMI (20.1 vs 4.9 months), previous heart failure (19.5 vs 4.9 months), hypertension (16.6 vs 8.3 months), angina (16.2 vs 5.0 months) and age >65 years (11.3 vs 5.7 months). Given potential treatment switching, the true absolute treatment effect could be underestimated by 28%.ConclusionFor patients with clinically defined heart failure following AMI, ramipril results in a sustained survival benefit, and is associated with an extension of life of up to 14.5 months for, on average, 13 months treatment duration.

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