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<p>The prolonged post-processing duration weakens the benefits of selective laser melting (SLM) technology in dental framework fabrication. To address this issue, we have innovatively introduced the infrared radiation heating (IRH) technique for post-processing SLM parts. This study investigated the effects of IRH on the microstructure and metal-ceramic bond properties of SLM Co-Cr-Mo-W dental alloys and also assessed the potential applications of IRH in dental restorations. These findings reveal that, regardless of the IRH or general furnace heating (GFH) treatments, significant differences are not found in the bond strength, but are found in the area fraction of adherence porcelain. The IRH-treated specimens demonstrate finer grains, more evenly distributed precipitates, a higher volume fraction of the γ phase, a higher coefficient of thermal expansion value, and comparable chemical diffusion layers compared with GFH-treated counterparts. However, the thinner native oxide film in IRH-treated specimens is the principal factor contributing to unchanged bond strength. This study presents a superior alternative for the post-processing of SLM dental restorations, achieving over 60% production efficiency enhancement without compromising their bond properties.</p>

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Infrared Radiation Heating for Annealing Selective Laser Melted Co-Cr-Mo-W Dental Alloy: Microstructure and Bond Properties

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Huwei Du,
  • Jinhao Liu,
  • Kun Wang,
  • Qianpeng Lyu,
  • Shaohui Xu,
  • Songyang Han,
  • Jie Jiang,
  • Jiuyang Zhao,
  • Jianxin Li,
  • Yanan Zhou

摘要

The prolonged post-processing duration weakens the benefits of selective laser melting (SLM) technology in dental framework fabrication. To address this issue, we have innovatively introduced the infrared radiation heating (IRH) technique for post-processing SLM parts. This study investigated the effects of IRH on the microstructure and metal-ceramic bond properties of SLM Co-Cr-Mo-W dental alloys and also assessed the potential applications of IRH in dental restorations. These findings reveal that, regardless of the IRH or general furnace heating (GFH) treatments, significant differences are not found in the bond strength, but are found in the area fraction of adherence porcelain. The IRH-treated specimens demonstrate finer grains, more evenly distributed precipitates, a higher volume fraction of the γ phase, a higher coefficient of thermal expansion value, and comparable chemical diffusion layers compared with GFH-treated counterparts. However, the thinner native oxide film in IRH-treated specimens is the principal factor contributing to unchanged bond strength. This study presents a superior alternative for the post-processing of SLM dental restorations, achieving over 60% production efficiency enhancement without compromising their bond properties.