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<p>This study aims to develop a dental restorative material with adjustable mechanical properties to address diverse clinical requirements. Polymer-infiltrated ceramic (sodium aluminum silicate, SAS) network (PICN) composites containing nano-tetragonal zirconia were fabricated by partially sintering SAS scaffolds containing 0–3% (mass fraction) nano-tetragonal zirconia, followed by resin infiltration. The phase composition and microstructure of the composites were characterized using X-ray diffraction and scanning electron microscopy. Mechanical properties, including flexural strength, fracture toughness, hardness, and elastic modulus, were evaluated through three-point bending and indentation tests, with a focus on understanding the reinforcement mechanisms. The incorporation of zirconia significantly improved flexural strength (up to 16.3%) and fracture toughness (up to 43.5%), as well as enhanced the elastic modulus and Vickers hardness. The introduction of nano-tetragonal zirconia enables fine-tuning of mechanical properties at the microstructural level, offering a promising pathway for the development of high-performance dental restorative materials.</p>

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Effect of Nano-Zirconia as a Secondary Phase on the Microstructure and Mechanical Properties of Polymer-Infiltrated-Ceramic-Network (Sodium Aluminum Silicate) Composites

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Jingchao Tao,
  • Taihe Li,
  • Lurun Xu,
  • Jing Liu

摘要

This study aims to develop a dental restorative material with adjustable mechanical properties to address diverse clinical requirements. Polymer-infiltrated ceramic (sodium aluminum silicate, SAS) network (PICN) composites containing nano-tetragonal zirconia were fabricated by partially sintering SAS scaffolds containing 0–3% (mass fraction) nano-tetragonal zirconia, followed by resin infiltration. The phase composition and microstructure of the composites were characterized using X-ray diffraction and scanning electron microscopy. Mechanical properties, including flexural strength, fracture toughness, hardness, and elastic modulus, were evaluated through three-point bending and indentation tests, with a focus on understanding the reinforcement mechanisms. The incorporation of zirconia significantly improved flexural strength (up to 16.3%) and fracture toughness (up to 43.5%), as well as enhanced the elastic modulus and Vickers hardness. The introduction of nano-tetragonal zirconia enables fine-tuning of mechanical properties at the microstructural level, offering a promising pathway for the development of high-performance dental restorative materials.