Flexural Strength of Different Commercially Available Auto-Polymerizing Acrylic Resins: An In Vitro Study.

Area of Science:

• Materials Science
• Biomaterials Engineering
• Dental Materials

Background:

• Auto-polymerizing acrylic resins, primarily poly(methyl methacrylate), are vital in prosthetic dentistry for their ease of use, cost-effectiveness, and aesthetics.
• Flexural strength is a critical mechanical property for these resins, determining their ability to withstand masticatory forces and resist fracture in dental prostheses.
• Higher flexural strength ensures the long-term integrity, longevity, and reliability of dental restorations, leading to improved clinical outcomes.

Purpose of the Study:

• To evaluate and compare the flexural strength of three commercially available auto-polymerizing acrylic resins: Pyrax, DPI, and Quick Ashvin.
• To determine the suitability of these resins for various dental applications based on their mechanical properties.
• To guide clinicians in selecting appropriate materials for different clinical scenarios, optimizing prosthetic performance and durability.

Main Methods:

• Twenty rectangular bar-shaped specimens (25 mm x 2 mm x 2 mm) of each resin type were prepared following American Dental Association specifications.
• Resins were mixed, poured into molds, and allowed to auto-polymerize at room temperature, followed by immersion in artificial saliva at 37°C for 10 days.
• Flexural strength was measured using a three-point bending test on a universal testing machine, with data analyzed by ANOVA and post-hoc Bonferroni tests.

Main Results:

• DPI resin demonstrated significantly higher flexural strength (mean=482.10 MPa) compared to Pyrax (mean=467.82 MPa) and Quick Ashvin (mean=470.17 MPa).
• Statistical analysis (ANOVA, p=0.004) indicated a significant difference among the resins.
• Post-hoc tests revealed highly significant differences between DPI and Pyrax (p=0.006) and significant differences between DPI and Quick Ashvin (p=0.028).

Conclusions:

• DPI resin is the optimal choice for high-stress dental applications due to its superior flexural strength.
• Quick Ashvin resin provides balanced performance suitable for interim restorations like temporary crowns.
• Pyrax resin is a cost-effective option for less demanding dental applications, highlighting the importance of material selection based on mechanical properties.