Water sorption, solubility, and bond strength of two autopolymerizing acrylic resins and one heat-polymerizing acrylic resin.
BACKGROUND
Because water sorption of autopolymerizing acrylic reline resins is accompanied by volumetric change, it is a physical property of importance. As residual monomer leaches into the oral fluids and causes tissue irritation, low solubility of these resins is desired. Another requirement is a satisfactory bond between the autopolymerizing acrylic resins and the denture base acrylic resin.


OBJECTIVE
This study compared the water sorption, solubility, and the transverse bond strength of 2 autopolymerizing acrylic resins (Duraliner II and Kooliner) and 1 heat-polymerizing acrylic resin (Lucitone 550).


METHODS
The water sorption and solubility test was performed as per International Standards Organization Specification No. 1567 for denture base polymers. Bond strengths between the autopolymerizing acrylic resins and the heat-polymerizing acrylic resin were determine with a 3-point loading test made on specimens immersed in distilled water at 37 degrees C for 50 hours and for 30 days. Visual inspection determined whether failures were adhesive or cohesive.


RESULTS
Duraliner II acrylic resin showed significantly lower water sorption than Kooliner and Lucitone 550 acrylic resins. No difference was noted in the solubility of all materials. Kooliner acrylic resin demonstrated significantly lower transverse bond strength to denture base acrylic resin and failed adhesively. The failures seen with Duraliner II acrylic resin were primarily cohesive in nature.


CONCLUSIONS
Autopolymerizing acrylic reline resins met water sorption and solubility requirements. However, Kooliner acrylic resin demonstrated significantly lower bond strength to denture base acrylic resin.
Cucci
A L
AL
Department of Removable Prosthodontics, Araraquara Dental School, São Paulo State University, Brazil.
Vergani
C E
CE
Giampaolo
E T
ET
Afonso
M C
MC
D000042:Absorption; D000180:Acrylic Resins / Q000737:chemistry*; D000327:Adsorption; D000704:Analysis of Variance; D001840:Dental Bonding; D003819:Denture Bases; D003823:Denture Rebasing; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D012995:Solubility; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014867:Water / Q000737:chemistry*
D000180:Acrylic Resins; C103362:duraliner II; D014867:Water; C103363:kooliner; C040291:Lucitone