Biocompatible porous titanium scaffolds produced using a novel space holder technique

Area of Science:

• Biomaterials Engineering
• Tissue Engineering
• Orthopedic Implants

Background:

• Bone defects require effective repair strategies.
• Current methods for creating porous scaffolds have limitations.
• Titanium's biocompatibility makes it suitable for skeletal implants.

Purpose of the Study:

• To develop a new fabrication strategy for porous titanium scaffolds.
• To optimize scaffold structure for mechanical performance and osseointegration.
• To create scaffolds mimicking human bone properties for hard tissue engineering.

Main Methods:

• Utilizing pharmaceutical sugar pellets as space holders during titanium powder sintering.
• Controlling sugar pellet size fractions for desired porosity and pore size.
• Removing sugar pellets by dissolution before sintering.
• Characterizing scaffold porosity, pore sphericity, and interconnectivity.

Main Results:

• Successfully fabricated porous titanium scaffolds with controlled porosity (40%) and pore size (300-425 µm).
• Scaffolds exhibited high sphericity and interconnectivity, leading to excellent mechanical properties (Young's modulus 16.4 GPa, strength 176 MPa).
• Mechanical properties closely mimic those of human bone.
• Demonstrated support for cell adhesion, viability, and spreading in vitro.

Conclusions:

• The novel sugar pellet method is a promising approach for producing porous titanium scaffolds.
• These scaffolds possess mechanical and biological properties suitable for skeletal repair and hard tissue engineering.
• The fabricated scaffolds show excellent potential for clinical applications in bone regeneration.