A Physico-Chemical Study of Soft Lining Materials for Acrylic Dentures
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Although soft lining materials are inadequate to their requirements,
their use is widespread. - This investigation has been undertaken in an
attempt to determine which are the better materials and how they may be
evaluated. In addition some new materials have become available which
may have advantages over existing materials.
A representative selection of thirteen commercially available soft
lining materials were chemically analysed. These, together with four
experimental materials, were subjected to laboratory investigation of
their water absorption and water solubility; their visco-elastic
properties and the effect on these properties of bonding the materials
to poly (methyl methacrylate); their rupture properties; their
wettability and their effect on the growth of Candida albicans. An
attempt was made to relate these properties to the chemical composition
of the materials.
Their water absorption and water solubility was in general
unacceptably high with the exception of two silicone rubber materials
and an experimental acrylic resin material. Conversely their
compliance was generally satisfactory, two experimental acrylic resin
materials being the exceptions. Two extremes of resilience were
recorded but either may prove clinically satisfactory.
With the exception of three of the silicone rubber materials their
rupture properties were satisfactory, and only an experimental natural
rubber material demonstrated completely unsatisfactory adhesion to
poly (methyl methacrylate), although other materials may be unreliable
in this respect.
Eleven of the materials demonstrated satisfactory wettability, the
OTHclZ
Femaining six including four of the rubber materials. Only four
materials inhibited the growth of Candida albicans and the constituents
responsible were identified. Concern was expressed regarding the tissue
compatibility of some of the constituents.
In conclusion, only three of the materials investigated merit
further study, two silicone rubber materials and an experimental
acrylic resin material which utilises a polymerisable plasticiser.
Authors
Wright, Paul StanleyCollections
- Theses [3827]