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Table 2 Comparative evaluation of alginate and digital impressions from the patient’s perspective (for response scale, see Table 1). Md, median; IQR, interquartile range

From: Students’ perspectives on the use of digital versus conventional dental impression techniques in orthodontics

Item Alginate Md [IQR] Intraoral scanner Md [IQR] Statistics Z, p-value
I felt comfortable during the impression with alginate/the intraoral scanner 3.0 [2.0–3.0] 3.0 [2.0–3.0] Z = − 0.673, p = 0.501
I experienced the impression with alginate/the intraoral scanner as uncomfortable 2.0 [2.0–3.0] 2.0 [1.0–3.0] Z = − 0.533, p = 0.594
During alginate impression/digital impression, the impression tray/the camera limited my comfort 3.0 [3.0–4.0] 2.0 [1.0–3.0] Z = − 3.496, p < 0.001
I experienced the alginate impression/ digital impression as painful 1.0 [1.0–2.0] 1.0 [1.0–2.0] Z = − 0.778, p = 0.436
During the alginate impression/digital impression I experienced breathing difficulties 2.0 [1.0–3.0] 1.0 [1.0–2.0] Z = − 2.558, p = 0.011
I experienced the taste of the impression material/powder as unpleasant 2.0 [1.0–2.0] 1.0 [1.0–2.0] Z = − 0.762, p = 0.446
During alginate impression/digital impression, I complained about nausea 1.0 [1.0–1.0] 1.0 [1.0–2.0] Z = − 0.516, p = 0.606