Bioactive ceramic scaffolds for bone regeneration consisting of a three-dimensional mesh of interpenetrating struts with square section were fabricated via Digital Light Processing (DLP). The ability of the technique to manufacture 3D porous structures from β-tricalcium phosphate (β-TCP) powders with different dimensions of struts and pores was evaluated, identifying the possibilities and limitations of the manufacturing process. Small pore sizes were found to seriously complicate the elimination of excess slurry from the scaffold’s innermost pores. The effect of the strut/pore size on the mechanical performance of the scaffolds under compressive stresses was also evaluated, but no significant influence was found. Under compressive stresses, the structures resulted weaker when tested perpendicularly to the printing plane due to interlayer shear failure. Interlayer superficial grooves are proposed as potential failure-controlling defects, which could also explain the lack of a Weibull size effect on the mechanical strength of the fabricated DLP scaffolds.

通过数字光处理（DLP）制作了用于骨骼再生的生物活性陶瓷支架，该支架由带有正方形截面的互穿撑杆的三维网格组成。评估了该技术从具有不同尺寸的支杆和孔的β-磷酸三钙（β-TCP）粉末制造3D多孔结构的能力，确定了制造过程的可能性和局限性。发现小孔径严重地使从支架最内层的孔中消除多余的浆液复杂化。还评估了压杆/孔尺寸对压缩应力下支架的机械性能的影响，但未发现显着影响。在压应力下 当垂直于印刷平面进行测试时，由于层间剪切破坏，导致结构较弱。提出将层间浅槽作为潜在的失效控制缺陷，这也可以解释对制造的DLP支架的机械强度缺乏威布尔尺寸效应的原因。