Abstract
Passive fit is a key prerequisite for successful implant-supported restorations, especially for full-arch implant-supported fixed restoration. The precise passive fit comes from the fine control of the entire manufacturing process of resorations. Intraoral welding directly connects the metal framework and the upper abutment in the mouth, which can ensure precise and stable passive fit. This article will explain the definition, necessity, influencing factors and clinical control methods of passive fit, in order to provide guidance for achieving precise passive fit in implant-supported full-arch prostheses.
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