Accuracy of Two Methods of Making Impressions for Complete-arch Implant Supported Fixed Prosthesis

Inclusion Criteria

• •Age 18-70 years old (including 18 and 70 years old);
• •The patient's maxilla or mandible cannot be preserved due to missing teeth or remaining teeth proposed for implant-retained restoration;
• •The patient's missing teeth area is available for placement of 4-6 implants;
• •Completion of osseointegration of the patient's implants after implant surgery;
• •The patient has at least 2 mm width of keratinized mucosa in the remaining alveolar ridge;
• •The patient voluntarily participates in the trial and signs an informed consent form