Surface reproduction was evaluated for epoxy resin and polyether resin dies as well as for gypsum dies by observing the changes in roughness. Significant differences were found by the interaction of the impression and the dies. The resin dies generally showed better results than the gypsum dies when the elastomeric impressions were used. Especially the resin dies were both excellent in surface ...

Silicone rubber in power transmission and transformation equipment is subjected to considerable temperature changes under different application environment conditions operational states. In tropical areas the Turpan region of China, surface temperatures silicone insulators may reach or exceed 70°C. During situ testing rubber, spectral signal fluctuate even be distorted when changes, consequentl...

This opinion article has been written on request because of the recent public controversy over silicone breast implants produced by a now-defunct company, Poly Implant Prosthese (PIP) in France. More than 300,000 PIP devices have been implanted. The purposes of my article are to (1.) provide a general overview of silicone breast implant materials, (2.) to describe the general safety of these ma...

Abstract In recent decades, high dielectric constant ( k ) polymer nanocomposites have proved excellent potential in and energy storage applications. Epoxy/silicon rubber composite materials shown promising properties applications such as high-voltage insulation. Three types of nanomaterials (SiO 2 , TiO @SiO with distinct intrinsic are carefully chosen to build high- epoxy/silicone this study....

Recently, considerable research efforts have focused on increasing the biocompatibility a nd bactericidal activity of biomedical polymeric devices (e.g., catheters, etc.) through incorporation of nitric oxide (NO) releasing molecules. NO is an important endogenous molecule that is well known for enhancing blood flow via its vasodilatory activity, but it also exhibits potent antithrombotic and a...

Abstract As the key components of sealing applications, rubber seals are subject to complicated environmental conditions during service lifetime. In this study, aging three typical materials, ethylene–propylene–diene monomer rubber, liquid silicone and fluorine was tested under different high- low-temperature cycle environments. The experimental results confirm that reciprocating temperature ca...

Between 1971 and 1976 eight patients underwent excision of the carpal lunate for pain from Kienböck's disease. The bone was replaced by a silicone rubber implant. An average of 84 months had elapsed when they were reviewed in December 1980. All eight were very satisfied with their operations. Objectively, the clinical results were good, but radiographs showed the presence of degenerative change...

In this paper, the authors describe the design of a bendable robotic tip for semi-autonomous colonoscopy called COLOBOT. It is a flexible robotic manipulator made of silicone rubber in view of the compact size and safety compatibility in the medical context. The outer diameter of the tip is 17 mm which is lesser than the average diameter of colon (20mm). Three servo-valves are used to control t...

BACKGROUND Prosthetic infections are a major problem, requiring complex and lengthy management. The role of blood proteins in the pathogenesis of implant infection has been investigated, but research into the role of CSF protein in shunt infections has not been undertaken, even though a high CSF protein has been assumed to increase the risk of such infections. METHODS New shunt catheters were...