Abstract: Essential requirements for the clinical success of all?ceramic fixed partial denture restorations include good esthetics, high fracture resistance and perfect marginal fit. Of the various methods used to evaluate the fit of prosthetic restorations, Micro?CT is a non?destructive, reliable and innovative method of analysis that allows high?resolution investigation of both the internal and the marginal gap. Based on the research results of previous studies，this review will cover the advantages and limitations of micro-CT in evaluating the internal and marginal fit of all?ceramic FPD restorations.

Key words: Micro CT, Marginal fit, Internal fit, all?ceramic FPD restorations