Bio-Alcamid: an alternative to fat transfer Ellis, David; Sardesai, Maya G
Facial plastic surgery clinics of North America,
11/2008, Letnik:
16, Številka:
4
Journal Article
Recenzirano
The recent evolution of the philosophy of rejuvenation therapy toward addressing soft tissue loss with aging has prompted growing interest in fat transfer procedures as a means of volume replacement. ...However, fat transfer has several undesirable characteristics, including the need for a donor site and lack of predictability of fat uptake and volume retention. Injectable fillers are gaining popularity as an alternative to fat transfer because of their lack of donor site morbidity, instant effects, predictability, and vastly reduced recovery period. Because temporary fillers require inconvenient repeat visits, patients have been requesting permanent options. This article describes the author's experience with a permanent adjustable large-volume filler based on polyalkylimide (Bio-Alcamid) and suggests that it could be a preferred and reliable alternative to fat transfer in appropriate patients. Permanent is defined as no decrease in volume of the product over time. However, because the area augmented may eventually decrease from further aging and fat atrophy, more product may need to be reinjected years later.
This paper is the third in a series of papers in which we examine both theoretically and experimentally the motion of the common line (three-phase line of contact) formed by a deforming viscoelastic ...fluid and air on a solid surface and its role in polymer extrusion. In this paper, the wetting behavior in the exit region of a die are shown experimentally to be responsible for the onset of the sharkskin instability in the LLDPE extrusion. The results of parts I and II are used to suggest a mechanism for the instability. Die drool is also discussed.
Die Drool and Polymer Degradation Hoy, Geoffrey S.; Giacomin, A. Jeffrey; Gilbert, Peter H.
Polymer-plastics technology and engineering,
02/2016, Letnik:
55, Številka:
3
Journal Article
Odprti dostop
Die drool is an operational problem associated with polymer extrusion. The extrudate collects outside of the die, necessitating periodic disruptions for cleaning. There is a debate over the mechanism ...that produces die drool: stress induced fractionation or thermal degradation. This article examines the latter. In cohesive failure, a slip discontinuity develops in the velocity profile, where frictional heating occurs. This slip heating can contribute to resin degradation, resulting in lower molecular weight fragments in the die drool. This article examines resin degradation kinetics and its influence on die drool rates and on the resulting drool layer and bulk polymer concentration profiles.
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