All patients had no contraindications to surgery, and all of them were examined by head CT and forehead X-ray. In the digital shaping group, conventional thin-slice CT scanning with a thickness of 2mm was performed, and the frontal bone was reconstructed in three dimensions. Then, the two-dimensional titanium mesh is molded by a "titanium mesh digital molding machine" to manufacture a two-dimensional personalized titanium mesh prosthesis that is completely consistent with the patient's frontal bone defect, and sterilized for later use. In the three-dimensional plastic group, a three-dimensional plastic titanium mesh which is more than 2cm larger than the edge of the defect was used, preformed with a traditional mold and sterilized for later use.