关键词: 无牙颌, 种植修复, 印模, 精度

Abstract: Compared to conventional complete denture，complete-arch implant-supported restoration provides improved fixation and stability，enhancing the masticatory efficiency of patients. Passive fit of the upper structure is critical to long-term success，which is closely related to impression accuracy. The main impression methods for complete-arch implant-supported restorations include conventional impression methods and digital impression methods. With the continuous development of digital technology，digital impressions are increasingly employed in edentulous patients due to their advantages of simplifying the impression-taking process and facilitating communication and design，as well as improving patient comfort；however，the accuracy of the impression remains uncertain. This article reviews the impression methods for complete-arch edentulous patients and some factors affecting the impression accuracy，aiming to increase clinicians′ level in impression of edentulous implant-supported restoration.

Key words: edentulous, implant-supported restoration, impression techniques, accuracy