TY - JOUR
TI - BOUNDARY LUBRICATION AND MAXILLOFACIAL PROSTHETIC POLYDIMETHYLSILOXANES
AU - POLYZOIS, GL
AU - WINTER, RW
AU - STAFFORD, GD
JO - BIOMATERIALS
PY - 1991
VL - 12
TODO - 1
SP - 79-82
PB - Elsevier Sci Ltd, Exeter, United Kingdom
SN - 0142-9612
TODO - 10.1016/0142-9612(91)90137-Y
TODO - WETTABILITY; PROSTHESES; MAXILLOFACIAL SURGERY; POLYDIMETHYLSILOXANE
TODO - Polydimethylsiloxanes exhibit hydrophobic behaviour and poor
wettability.  These features impose some problems with the clinical
performance of the material when used for the construction of intraoral
and extraoral facial prostheses.  Surface active agents were added to
modify the surface energy of the polydimethylsiloxane and contact angle
measurements were carried out to observe wetting characteristics.  Five
siloxane-alkene oxide block copolymers, one organosilicon quaternary
ammonium chloride and an epoxyalkyl silane ester were used as
surfactants.  The best surfactant in terms of permanency and contact
angle lowering achieved a value of 24-degrees when added at 10% level
compared with 57-degrees for the unmodified silicone.  The fairly high
viscosity, combined with a comb-like structure, together with the high
hydroxyl number of 75 provided the correct balance of permanence and
wetting characteristics.
ER -