For a unilateral arch implant and the mandible models with two implants, no significant difference was observed in the accuracy between the digital and conventional implant impressions on scan bodies; however, the corresponding differences for trans-arch implants and mandible with six implants were extremely significant ( P <.001).
Optical impressions have been reported to markedly reduce patients’ discomfort 26 , 27 compared with the previous impression technique, which was not technically demanding and sensitive; 28 , 29 therefore, the digital technique could be the alternative to the conventional impression technique, with the popularity of latter showing a decreasing trend. 30 The purpose of this study was to compare the accuracy between digital impressions and conventional impressions on the implant models.