Color and flexural properties of nanoparticles-modified denture base resin: An in vitro comparative study

• Published in: International journal of health sciences 2024-05, Vol.18 (3), p.23-29
• Main Authors: Emam, Abdel-Naser M, Ahmed, Karim-Eldin Ibrahim, Shaaban, Adel M, Alqhtani, Mohammad Abdullah, Gad, Mohammed M, Helal, Mohamed Ahmed
• Format: Article
• Language: English
• Subjects: Original
• ISSN: 1658-3639; 1658-7774

Reinforcement of polymethylmethacrylate (PMMA) denture base resins (DBRs) with inorganic fillers with superior properties and accepted aesthetics are favored and still a big dilemma. This study was undertaken to evaluate the color change, flexural strength, and modulus of elasticity of heat-polymerized DBR material modified with silver nanoparticles (AgNPs) and zirconium dioxide nanoparticles (ZNPs). Sixty acrylic specimens (30/color test, 30/flexural properties) were fabricated and divided according to nanoparticles type and addition into 3 groups ( = 10). Group-I; unmodified specimens, Group-II; modified specimens with 0.5wt% AgNPs (PMMA/AgNPs), and Group-III; modified specimens with 7.5wt% ZNPs (PMMA/ZNPs). Disc-shape (20 × 3 mm) and bar-shape (65 × 10 × 2.5 mm) specimens were fabricated for color and flexural properties, respectively. The spectrophotometer was used for evaluation of the color change (∆E). The flexural strength and elastic modulus evaluation was carried out using a 3-point bending test (5 mm/min). Tukey's and one-way ANOVA were used to analyze the data at a significant level ≤ 0.05. PMMA/AgNPs group exhibited a significant increase in color change when compared with PMMA/ZNPs. PMMA/ZNPs showed significantly the highest flexural strength value when compared with unmodified and PMMA/AgNPs groups ( < 0.001), however, there was an absence of significant differences in terms of flexural strength values between PMMA/AgNPs and unmodified groups ( > 0.05). PMMA/AgNPs insignificantly increased its modulus of elasticity strength ( = 0.09410) while PMMA/ZNPs significantly increased its modulus of elasticity strength ( = 0.00396). The AgNPs and ZNPs addition to PMMA increased the color change and AgNPs change the color of DBRs. The flexural attributes of DBRs have been increased by ZNPs.