Method of designing dental-implant prosthesis

A method of designing a dental-implant prosthesis includes the steps of arranging a referential jig and combining the referential jig into a fixture installed in a patient's oral cavity, the referential jig having at least one feature point, the fixture having a connection interface, the referential jig having an opposite-joint interface; scanning the patient's oral cavity to acquire an oral digital data and a referential-jig digital data having at least one feature-point digital data; selecting one digital dental-implant prosthesis from a prosthetic database in a computer, a digital positioning jig overlapping the digital dental-implant prosthesis for combination with the connection interface, and proceeding with overlapping and localization of the digital positioning jig and the referential-jig digital data to combine the referential-jig digital data into the connection interface; and adjusting the position, size, and angle of the digital dental-implant prosthesis to acquire the digital dental-implant prosthesis which is most suitable to the patient.