The Effect of Chemical Disinfectants and Repair Materials on The Transverse Strength of Repaired Acrylic Resin Denture Base Material

This study compared the effect of various repair materials and the effect of various chemical disinfectants on the transverse strength of the repaired heat polymerized acrylic resins.

120 specimens (65×10×3mm) (ISO 1567 standard) of heat-polymerized acrylic resin (ADA specification 12) were randomly divided into 12 groups coded A to L. All the 12 groups were immersed in the following disinfectants 1%, 2.5% and 5.25% Sodium Hypochlorite, 2% Glutaraldehyde and 3.78% Sodium Perborate for 10 minutes. Heat-polymerized acrylic resin was used for repairing the specimens from Group A to Group F, while autopolymerizing acrylic resin was used for repairing the specimens of Group G to L. Specimens of Group A and Group G were taken as control groups. Specimens of groups B to F and Groups H to L were again immersed in the same disinfectants. The transverse strength of the specimens were determined using a 3-point bending testing device in a Universal Testing Machine. Results were analyzed using Statistical Package for Social Sciences Version 15.0. Intergroup comparisons were made using ANOVA and independent samples "t"-test at significance level of "p" >0.05.

The results of the present study demonstrated that, the flexural strength of the repaired acrylic resin specimens were not significantly (p>0.05) affected by immersion in any of the five types of immersion disinfectant solutions used.

The flexural strength of the repaired acrylic resin specimens were not significantly affected by immersion in any of the five types of immersion disinfectant solutions used.