The impressions obtained were then compared with the original geometry of the reference model and within each test group.Ī point-to-point measurement of the surface of the model using the signed nearest neighbour method resulted in a mean (10%-90%)/2 percentile value for the difference between the impression and original model (trueness) as well as the difference between impressions within a test group (precision). To investigate the accuracy of conventional and digital impression methods used to obtain full-arch impressions by using an in-vitro reference model.Įight different conventional (polyether, POE vinylsiloxanether, VSE direct scannable vinylsiloxanether, VSES and irreversible hydrocolloid, ALG) and digital (CEREC Bluecam, CER CEREC Omnicam, OC Cadent iTero, ITE and Lava COS, LAV) full-arch impressions were obtained from a reference model with a known morphology, using a highly accurate reference scanner.
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