Assessing the Color and Surface Characteristics of Additively Fabricated Denture Base Resins Containing Nanoparticles

Area of Science:

• Materials Science
• Biomaterials Engineering
• Dental Materials

Background:

• Additively fabricated (AF) denture base resins require evaluation for long-term stability.
• Nanoparticle incorporation aims to enhance mechanical and aesthetic properties of dental materials.

Purpose of the Study:

• To compare the effects of nanodiamond (ND) and silicon dioxide (NS) nanoparticles on color stability and surface properties of two AF denture base resins.
• To assess the influence of nanoparticle concentration (0.25% and 0.5%) after thermal cycling.

Main Methods:

• Two hundred specimens of NextDent and ASIGA denture base resins were additively fabricated.
• Specimens were divided into groups with ND (0.25%, 0.5%), NS (0.25%, 0.5%), or no nanoparticles (control).
• Color change (ΔE_Lab), surface roughness (Ra), and hardness (VHN) were measured after 5000 thermal cycles.

Main Results:

• Nanoparticle type and resin material significantly affected color change (ΔE_Lab), but concentration did not.
• Nanodiamonds resulted in higher color change with NextDent compared to silicon dioxide nanoparticles.
• NextDent with 0.5% silicon dioxide nanoparticles exhibited the highest hardness and lowest surface roughness.

Conclusions:

• Nanoparticle effects on denture base resin properties are dependent on nanoparticle type, concentration, and base material.
• Careful selection of nanoparticles and resin materials is crucial for optimizing additively fabricated nanocomposite denture bases.