The technical review of metallic powder materials for additive manufacturing in dentistry mainly focus on three aspects: the performance requirements of metallic powder for additive manufacturing in dentistry, the process parameter validation of additive manufacturing and the performance of printed test pieces after additive manufacturing and forming. The performance requirements of metallic powder for additive manufacturing in dentistry include but not limited chemical composition (oxygen, hydrogen and impurity elements), sphericity, powder particle size and size distribution, flowability, apparent density, and tap density. For process parameter validation of additive manufacturing, it is necessary to clarify the printing parameters of the printing equipment and printing equipment systems compatible with the product, including but not limited to laser power, spot diameter, scanning interval, powder spreading thickness and scanning speed. In addition, it is necessary to submit the validation and verification report on various parameters and specify the relevant parameters in product technical requirements (PTR) and instructions for use (IFU). The performance requirements for the printed test piece after additive manufacturing and forming include the verification of the mechanical strength of the printed test piece in each direction, which should simulate as far as possible the actual use of the dental restorations in clinical application, with its fatigue and resistance to repeated bending taken into consideration. The corrosion resistance, inclusions and porosity, and warping of the printed test piece should also be verified.
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