Question: What is the best known brand name of the material other than dacron often used to replace the aneurysmal portion of the aorta in OAS?

Context paragraphs:
Agrotissa: Agrotissa or in Greek Αγρότισσα is the brand name for a range of products sold in Greece.  It literally means "farmer-girl".  This is a well-known brand in Greece, a common variety being the condensed milk, which is marketed in tins of 410 g, or 387 ml.  It is designed to be used with water, in the ratio of 1:1.  One tin will produce 4 glasses of milk, with 3.75% fat content.  Due to its easy dry storage, this milk is often used in making Frappe which is known sometimes as "Greek coffee", especially economical for canteens.

Open aortic surgery: Open aortic surgery ("OAS", also known as Open aortic repair, "OAR") describes a technique whereby an abdominal or retroperitoneal surgical incision is used to visualize and control the aorta for purposes of treatment.  OAS is used to treat aneurysms of the abdominal and thoracic aorta, aortic dissection, acute aortic syndrome, and aortic ruptures.  Aortobifemoral bypass is also used to treat atherosclerotic disease of the abdominal aorta below the level of the renal arteries.  In 2003, OAS was surpassed by endovascular aneurysm repair (EVAR) as the most common technique for repairing abdominal aortic aneurysms in the United States.  In OAS for abdominal aortic aneurysm, the aneurysmal portion of the aorta is replaced with a graft, usually made of dacron or PTFE.

Bescherelle: A Bescherelle is a French language grammar reference book best known for its verb conjugations volumes.  It is named in honour of the 19th-century French lexicographer and grammarian Louis-Nicolas Bescherelle (and perhaps his brother Henri Bescherelle).  It is often used as a general term, but the "Collection Bescherelle" is in fact a brand name, used by Éditions Hatier for Metropolitan French, and by Éditions Hurtubise for Canadian French.

Brand equity: 'Brand equity' is a phrase used in the marketing industry which describes the value of having a well-known brand name, based on the idea that the owner of a well-known brand name can generate more revenue simply from brand recognition; that is from products with that brand name than from products with a less well known name, as consumers believe that a product with a well-known name is better than products with less well-known names.

All Metal Products Company: All Metal Products Company was an American toy company founded in 1920 and based in Wyandotte, Michigan for most of its history.  It produced inexpensive pressed metal toys under the Wyandotte brand name, and was the largest manufacturer of toy guns in the US for several decades in the 20th century.  The company's slogan was "Wyandotte Toys are Good and Safe."  To keep costs down, the company used scrap and surplus raw materials whenever possible, often manufacturing their toys from scrap metal obtained from local auto factories.

Polytetrafluoroethylene: Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications.  The best known brand name of PTFE-based formulas is Teflon by Chemours.  Chemours is a 2015 spin-off of DuPont Co., which discovered the compound in 1938.

Solid-state electronics: Solid-state electronics are those circuits or devices built entirely from solid materials and in which the electrons, or other charge carriers, are confined entirely within the solid material.  The term is often used to contrast with the earlier technologies of vacuum and gas-discharge tube devices, and it is also conventional to exclude electro-mechanical devices (relays, switches, hard drives and other devices with moving parts) from the term solid state.  While solid-state can include crystalline, polycrystalline and amorphous solids and refer to electrical conductors, insulators and semiconductors, the building material is most often a crystalline semiconductor.  Common solid-state devices include transistors, microprocessor chips, and RAM.  A specialized type of RAM called flash memory is used in flash drives and, more recently, solid-state drives to replace mechanically rotating magnetic disc hard drives.  A considerable amount of electromagnetic and quantum-mechanical action takes place within the device.  The expression became prevalent in the 1950s and the 1960s, during the transition from vacuum tube technology to semiconductor diodes and transistors.  More recently, the integrated circuit (IC), the light-emitting diode (LED), and the liquid-crystal display (LCD) have evolved as further examples of solid-state devices.

Perforated hardboard: Perforated hardboard is tempered hardboard which is pre-drilled with evenly spaced holes.  The holes are used to accept pegs or hooks to support various items, such as tools in a workshop.  Pegboard is a brand name of this product that is often used as a generic term for perforated storage boards made of hardboard, wood, metal, or other material.  It is commonly used in retail settings along with steel rods sticking out to hold peggable products such as bagged potato chips, printer ink, and action figures.

Nerf Blaster: Nerf Blaster is a toy gun made by Hasbro that fires foam darts, discs, or, in some cases, foam balls.  The term "Nerf gun" is often used to describe the toy; however, it is often used as a blanket term for any foam dart blaster, regardless of whether or not it has the Nerf brand name.  Nerf blasters are manufactured in multiple forms, including pistols, rifles, and light machine guns.  The first Nerf blasters emerged in the late 1980s with the release of the Nerf Blast-a-Ball and the Arrowstorm.

Syncros: Syncros is a brand of bicycle components, with an emphasis on off-road bicycle parts.  Founded by Peter Hamilton and Pippin Osborne in 1986 and originally based in Vancouver, British Columbia, Syncros had its heyday in the early 1990s as one of the earliest and most sought-after brands of high end aftermarket off-road bicycle parts.  In the late 1990s, the company had financial difficulties and was sold to the large U.S. based bicycle company GT.  Shortly thereafter, GT itself was purchased by Schwinn, which in turn was purchased by Pacific Bicycle Group, a large Taiwanese conglomerate known mainly for low end, mass market bicycles and parts.  Pacific was quick to try to capitalize on the Syncros brand name, and used the Syncros label on many cheaply produced OEM parts, severely damaging the brand's reputation.  Due to a lapse in trademark registration in the early 2000s, the Syncros brand name was briefly grabbed in the UK by Super Cycles of Nottingham.  However, a settlement was reached between Super Cycles and Pacific, resulting in Pacific regaining control of the brand name.

Supporting paragraphs: Open aortic surgery Polytetrafluoroethylene
Answer: Teflon