DOI: 10.36347/sjds.2016.v03i09.003

Pages: 251-256

Abstract: Immersion in chemical solutions used for cleansing and disinfecting prostheses can decrease the strength of denture base resins, making them more prone to fracture during use. The aim of the present study was to assess the effect of two chemical disinfectants and time of immersion on the transverse strength of 3 heat-polymerized acrylic resins. A total of 120 rectangular specimens (65 x 10 x 3 mm), 40 per resin (Meliodent, Trevalon HI, DPI.), were fabricated using short curing polymerization cycle. One side of each specimen was not polished and the other was mechanically polished, and immersed for 15 or 30 minutes in either 0.525% sodium hypochlorite or 2% glutaraldehyde. The control specimens were immersed only in distilled water. The transverse strength (N/mm2) was tested for failure in a universal testing machine, at a crosshead speed of 5 mm/min. Multiple comparison using tukey test identified significant differences (P<0.05) in transverse strength between the three resins tested. No significant differences were observed between resins submitted to both types of disinfectants for different immersion periods (15 and 30 minutes), or interaction. Trevalon HI resin presented the greatest transverse strength values followed by Meliodent and DPI Transverse strength of each resin was not affected significantly after immersion in the disinfectants for the immersion periods tested (15 and 30 minutes).