Abstract: The present disclosure belongs to the technical field of 3D printers, and a sunken 3D printer and a 3D printing method are disclosed. The sunken 3D printer comprises a main platform, a first linear driving mechanism, a second linear driving mechanism, a printing platform and an optical machine scraper assembly. The main platform comprises a horizontal platform and a vertical platform which are perpendicular to each other, and a resin tank is provided in the horizontal platform; and the first linear driving mechanism and the second linear driving mechanism are installed at the two ends of the vertical platform, the first linear driving mechanism is used for driving the printing platform to move up and down, and the second linear driving mechanism is used for driving the optical machine scraper assembly to move up and down.

Abstract: The present disclosure belongs to the technical field of 3D printers, and a sunken 3D printer and a 3D printing method are disclosed. The sunken 3D printer comprises a main platform, a first linear driving mechanism, a second linear driving mechanism, a printing platform and an optical machine scraper assembly. The main platform comprises a horizontal platform and a vertical platform which are perpendicular to each other, and a resin tank is provided in the horizontal platform; and the first linear driving mechanism and the second linear driving mechanism are installed at the two ends of the vertical platform, the first linear driving mechanism is used for driving the printing platform to move up and down, and the second linear driving mechanism is used for driving the optical machine scraper assembly to move up and down.

Abstract: Disclosed are a dental gradient color-resin ceramic restoration material and a preparation method thereof. The method includes: preparing at least two paste materials with different colors, respectively dispersing the paste materials with different colors at a certain speed and under a vacuum of -0.01-0.1 MPa to obtain at least two granular materials with different colors having an average size of 0.1 mm to 5 mm; spreading the at least two granular materials with different colors to be flat in a mould in sequence to obtain at least two layers, and then tightly combining the at least two layers at a pressure of 0.5-5 MPa to obtain a semi-finished product of a gradient color-resin ceramic restoration material; polymerizing and curing the semi-finished product at 60-200° C. and 2-50 MPa to obtain a multilayer gradient color-resin ceramic restoration material.

Abstract: The application discloses a dental zirconia restoration material with uniform transition of strength and color, and a preparation method thereof. The preparation method includes the following steps: (1) pouring colored zirconia powder into a dry pressing mould in accordance with a sequence of the strength from high to low and the color from dark to light for each layer, and performing dry pressing; (2) performing isostatic cool pressing after the dry pressing; (3) performing pre-sintering after the isostatic cool pressing to obtain a greenware; and (4) performing CAD/CAM cutting on the greenware, and finally performing final sintering to obtain the dental zirconia restoration material. In the present application, the strength of a restoration can gradually increase from a cut end to the neck, the wear to adjacent teeth and jaw teeth is reduced, and long-bridge restoration can be realized due to the high strength of the neck.