Non-silicate nanoparticles for improved nanohybrid resin composites

Area of Science:

• Materials Science
• Biomaterials Engineering
• Dental Materials

Background:

• Nanohybrid resin composites are widely used in dentistry.
• Optimizing nanofiller composition is crucial for improving composite performance.
• Existing commercial composites face challenges with long-term stability and mechanical properties.

Purpose of the Study:

• To develop and characterize novel nanohybrid resin composites using silica-coated zirconia and alumina nanoparticles (ALSI and ZRSI).
• To compare the properties of these experimental composites against a commercial control (Filtek Z350 XT) and nanosilica-based composites.
• To evaluate the impact of nanofiller modification on key physical and mechanical properties.

Main Methods:

• Experimental nanohybrid resin composites were prepared using ALSI and ZRSI nanoparticles, alongside nanosilica references and a commercial control.
• Evaluated properties included viscosity, conversion of components (CC), depth of cure, surface topography, hardness, opacity, radio-opacity, and edge chipping resistance (ReA).
• Mechanical properties, specifically flexural strength (σf) and fracture toughness (KIC), were tested after aging (15 K thermal cycles).

Main Results:

• ALSI and ZRSI composites exhibited lower viscosity and more irregular nanoagglomerates than nanosilica composites.
• ZRSI composites showed lower CC conversion and depth of cure but higher opacity, radio-opacity, and hardness.
• ALSI and ZRSI composites demonstrated stable flexural strength and fracture toughness after aging, unlike the control and nanosilica composites which degraded significantly.

Conclusions:

• ALSI and ZRSI nanohybrid resin composites offer improved and more stable physical properties compared to nanosilica-based and commercial alternatives.
• Modifying nanofiller composition is an effective strategy for enhancing the performance of nanohybrid resin composites.
• These findings suggest a promising direction for developing next-generation dental restorative materials.