Aim and objective: Structural disorders due to an allergic reaction and water absorption of denture base materials have created a negative effect on the patients. This study aimed to evaluate the water sorption values of different base denture base materials [polymethylmethacrylate (PMMA) and polyamide (PA)] which were kept at different immersion times.
Materials and methods: Eighty-eight specimens shaped as a disk with dimensions of (50 mm in length × 0.5 mm in thickness) were used in this study. PMMA and PA denture base materials were prepared according to the manufacturer\'s instructions. The control group was measured and recorded before immersing in solutions, the readings (m0) of each specimen were measured using an electronic balance, and data were recorded. Then, the specimens were immersed for 1, 7, 30, and 45 days (d). The water sorption values of each specimen were measured before and after desiccation. Kolmogorov–Smirnov test and Mann–Whitney U test were used for analyzing data.
Results: The PMMA specimens showed the highest sorption values in distilled water at 30 days (0.30 ± 0.03 mg/mm2), while PA specimens showed the highest sorption values in the tea solution for 30 days (0.51 ± 0.06 mg/mm2). PA and PMMA denture base materials showed statistically significant values (p < 0.05) after 30 days of immersion in water.
Conclusion: The sorption values of the PA materials were higher than those of the PMMA materials.
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