Comparative Analysis of the Effects of Different Disinfection Methods on the Mechanical Properties of Valplast and Acrylic Resin Denture Base Materials
DOI:
https://doi.org/10.15218/edj.2026.11Keywords:
Heat-cured acrylic resin, Valplast, Flexural strength, Flexural modulus, chemical disinfectantAbstract
Background and objective: Dental prostheses should be disinfected effectively without damaging the denture base.
Aim: This in vitro study evaluates the effect of three commonly used chemical disinfectants, 4% chlorhexidine, 2% glutaraldehyde, and 5.25% sodium hypochlorite, on the mechanical properties of two widely used denture base materials: Heat-cured acrylic resin and Valplast.
Methods: A total of 160 rectangular specimens were fabricated and equally divided into two main material groups (80 specimens of Heat-cured acrylic resin and 80 specimens of Valplast). Each group was further subdivided into four subgroups (n=20) according to the disinfectant applied, including a control group with distilled water. Disinfection protocols involved immersing each specimen in distilled water for 3 minutes, followed by a 10-minute exposure to the designated disinfectant, and concluding with a 3-minute washing in distilled water. Flexural strength and flexural modulus were assessed using a universal testing machine based on the three-point bending test according to ISO 178:2019 standards.
Results: Statistical analysis was conducted using one-way ANOVA, Dunnett’s post hoc, and an independent t-test at a significance level of P ≤ 0.05. The flexural strength test indicated that, for both main groups, the control group exhibited the highest mean values, while specimens immersed in 5.25% sodium hypochlorite recorded the lowest mean values and showed no significant differences between Heat-cured acrylic resin and Valplast materials under corresponding treatment conditions.
Conclusion: These findings suggest that disinfection protocols do not impact the mechanical properties of denture base materials, and Valplast consistently exhibited lower values in both parameters compared to Heat-cured acrylic resin.
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