Polytetrafluoroethylene can be considered as a model for calorimetric studies of complex systems with thermodynamics transitions at ambient temperature. This polymer exhibits two phase transitions of different nature at 292 K and 303 K. We show that sensitive accalorimetry measurements allow us to study the thermodynamic behaviour of polytetrafluoroethylene when it is brought out of thermodynam...

A 56-year-old man presented with progressive lower extremity claudication, rest and night pain, and severe dyspnea on exertion. Past history included chronic back pain, hypertension, coronary artery disease, and obstructive sleep apnea. Cardiac catheterization was performed and showed a diminutive narrow aorta originating at the renal level and extending distally in the midline (A-D). This was ...

This chapter is divided into two sections. The first section compares patient outcomes and Medicare costs for the two primary access types used in hemodialysis patients, the arteriovenous (AV) fistula and a polytetrafluoroethylene (PTFE) graft (USRDS 1994). This study combines the 1990 incident patient data from the USRDS Casemix Adequacy Study with the HCFA billing data. The primary outcomes i...

Oroantral communication (OAC) is a common complication following extraction of maxillary premolar and molar teeth. This is due to the close anatomic proximity of the roots of these teeth to the maxillary sinus. The most frequent methods utilized in the office described in the literature to close an oroantral communication involve the use of a buccal or palatal rotational advancement flap or use...

Blood-contacting medical devices are often associated with shear-induced and contact activation thrombosis. Superhydrophobic materials have shown promise to reduce flow drag forces, but not activation. Here, a strategy of selectively grafting potent anti-thrombin compound on the tips surface microstructures superhydrophobic polytetrafluoroethylene foam, is presented, concurrently achieve reduct...

A 31 year-old man with a biopsy-proved retroperiotoneal yolk sac tumor was referred to our clinic. Physical examination revealed a thum- tip sized left supra-clavicular mass, a huge right abdominal mass and a tiny hard mass of the right testis. On CT scan, the abdominal tumor, 13 cm in diameter, encircled the inferior vena cava. Serum levels of LDH, AFP and hCG-beta were 2,585 U/l, 19,922 ng/ml...

ABSTRACT Guided bone regeneration aims to gain vertical and horizontal volume in atrophic ridges, using different regenerative techniques associated with biomaterials, occasional post-surgical complications. The objective of the case report was describe successive approaches minimize eliminate complications presented postoperative period a patient submitted guided technique. In first surgery, d...