The Korea Advanced Institute of Science and Technology (KAIST) in South Korea has announced a breakthrough in 3D printing that promises to revolutionize the fields of dental implants and precision engineering.
The research, led by Professor Kim Miso of the Department of Mechanical Engineering at KAIST, addresses a key weakness of conventional stereolithography (SLA) 3D printing: while it offers high speed and precision, printed products are often brittle and susceptible to impact.
The team’s research, published in July in the journal Advanced Materials and featured as the cover article this month, highlights two key innovations.
First, the researchers created a new material—dynamically bonded polyurethane acrylate (PUA). This resin, due to its elasticity and viscosity, absorbs shock and vibration, enabling the printing of stronger and more durable structures.
Second, they developed a grayscale digital light processing (DLP) technology. By adjusting the light intensity during the printing process, different regions of the same structure can achieve varying strengths—similar to how bone and cartilage work together in the human body.
To further enhance performance, the team applied machine learning to automatically design the optimal strength distribution based on loading conditions. This eliminates the need for expensive multi-material printing, enabling single-material, single-process manufacturing, reducing device costs and development time.
“This technology expands material and design freedom,” said Professor Kim. “Customized dental implants will be more durable and comfortable to wear, and durable, precision components can be produced more cost-effectively. This method has potential applications in biomedical engineering, aerospace, and robotics.”