نتایج جستجو برای: کیج peek

تعداد نتایج: 1874  

ژورنال: :دانشور پزشکی 0
دکتر یونس روحانی younos rohani دکتر اشکان دیوان بیگی ashkan divanbeigi دکتر طاهر طاهری taher taheri دکتر فؤاد الهی foad elahi

مقدمه و هدف: بحث های مختلفی در رابطه با نتایج درمانی روش های دیسککتومی قدامی ساده گردن، همراه با فیوژن استخوانی و استفاده از کیج وجود دارد. هدف این مطالعه بررسی نتایج درمانی این سه روش است.   مواد و روش ها: بیمارانی که از سال 80 تا 83 در سه بیمارستان در تهران تحت دیسککتومی قدامی گردن بدون فیوژن، همراه با فیوژن از کرست ایلیاک و فیوژن با کیج peek قرار گرفته بودند، حداقل به مدت یکسال و نیم بعد از ...

Solid alkaline fuel cell is employed by polymer anion exchange membrane (AEM) that is permeable to hydroxide ion. A number of polymers have been proposed for AEM which include polysulfone (PSF), poly (phenylene oxide) (PPO), and poly (ether ether ketone) (PEEK). The purpose of this paper was to conduct a critical review on the development of PEEK polymer as AEM, particu...

2014
Rui Ma Songchao Tang Honglue Tan Wentao Lin Yugang Wang Jie Wei Liming Zhao Tingting Tang

A bioactive composite was prepared by incorporating 40 wt% nano-hydroxyapatite (nHA) into polyetheretherketone (PEEK) through a process of compounding, injection, and molding. The mechanical and surface properties of the nHA/PEEK composite were characterized, and the in vitro osteoblast functions in the composite were investigated. The mechanical properties (elastic modulus and compressive stre...

2017
Nina Lümkemann Marlis Eichberger Bogna Stawarczyk

This study investigated the impact of different light curing units (LCUs) for the polymerization of adhesive system visio.link (VL) on the tensile bond strength (TBS) of different PEEK compositions. For TBS measurements, 216 PEEK specimens with varying amounts of TiO₂ (PEEK/0%, PEEK/20%, PEEK/>30%) were embedded, polished, air abraded (Al₂O₃, 50 µm, 0.4 MPa), conditioned using VL, and polymeriz...

2016
Rui Ma Zhifeng Yu Songchao Tang Yongkang Pan Jie Wei Tingting Tang

Polyetheretherketone (PEEK) exhibits appropriate biomechanical strength as well as good biocompatibility and stable chemical properties but lacks bioactivity and cannot achieve highly efficient osseointegration after implantation. Incorporating bioceramics into the PEEK matrix is a feasible approach for improving its bioactivity. In this study, nanohydroxyapatite (n-HA) and nano-calcium silicat...

2017
T. Anjan Kumar J. Brintha Jei B. Muthukumar

STATEMENT OF PROBLEM Poly-ether-ether-ketone (PEEK), a high-performance semi-crystalline thermoplastic polymer, has been employed to replace the metallic implant components in orthopedics. There were various studies performed in accordance to medical grade PEEK, but the relationship between titanium dioxide (TiO2)-coated PEEK, TiO2-blended PEEK, and untreated PEEK still remains complicated, eve...

2014
Rui Ma Tingting Tang

The synthetic thermoplastic polymer polyetheretherketone (PEEK) is becoming a popular component of clinical orthopedic and spinal applications, but its practical use suffers from several limitations. Although PEEK is biocompatible, chemically stable, radiolucent and has an elastic modulus similar to that of normal human bone, it is biologically inert, preventing good integration with adjacent b...

2017
Takayoshi Shimizu Shunsuke Fujibayashi Seiji Yamaguchi Bungo Otsuki Yaichiro Okuzu Tomiharu Matsushita Tadashi Kokubo Shuichi Matsuda

BACKGROUND Polyetheretherketone (PEEK) is a widely accepted biomaterial, especially in the field of spinal surgery. However, PEEK is not able to directly integrate with bone tissue, due to its bioinertness. To overcome this drawback, various studies have described surface coating approaches aimed at increasing the bioactivity of PEEK surfaces. Among those, it has been shown that the recently de...

2017
Fitria Rahmitasari Yuichi Ishida Kosuke Kurahashi Takashi Matsuda Megumi Watanabe Tetsuo Ichikawa

Polyetheretherketone (PEEK) is a semi-crystalline linear polycyclic thermoplastic that has been proposed as a substitute for metals in biomaterials. PEEK can also be applied to dental implant materials as a superstructure, implant abutment, or implant body. This article summarizes the current research on PEEK applications in dental implants, especially for the improvement of PEEK surface and bo...

2016
William R. Walsh Matthew H. Pelletier Nicky Bertollo Chris Christou Chris Tan

BACKGROUND Polyetheretherketone (PEEK) has a wide range of clinical applications but does not directly bond to bone. Bulk incorporation of osteoconductive materials including hydroxyapatite (HA) into the PEEK matrix is a potential solution to address the formation of a fibrous tissue layer between PEEK and bone and has not been tested. QUESTIONS/PURPOSES Using in vivo ovine animal models, we ...

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