Scan
9. No scan holes/noise above the outline/approximal planes of adjacent teeth	9. Scan is complete, without holes above the outline and proximal planes of adjacent teeth
Undercut
10. preparation is not undercut (up to 0.05 mm)	10. prepCheck (PC) is no more than 0% in the last segment (>0.05) of undercut
Taper (only for retentive—cervical—part of the preparation)	11‐14. the percentage within the margins (blues) results in a maximum score of:
11. distal: taper > 2° with respect to insertion axis (0°‐10°)	4 points (100%)
12. mesial: taper > 2° with respect to insertion axis (0°‐10°)	3 points (≥75%)
13. palatal: taper 2° with respect to insertion axis (0°‐10°)	2 points (≥50%)
14. buccal: taper 2° with respect to insertion axis (0°‐10°)	1 point (≥25%)
Reduction (not applicable to outline)
15. incisal/occlusal 1.5 mm reduction (± 0.5 mm)	15. PC makes an axial section to measure the to measure the distance between preoperative and postoperative incisal edge.
16. buccal (if necessary, approximal as occlusal plane was unnecessarily reduced to approximal) 1 mm reduction (± 0.5 mm)	16‐17. PC distinguishes between axial and occlusal reduction. Axial reduction is obviated by the taper. Occlusal reduction concerns the buccal and palatal planes. PC is no more than 0% in the first and last segments (too much/too little reduction) of the occlusal reduction
17. palatal/lingual 1 mm reduction (± 0.5 mm)
Preparation Type
18. chamfer follows the semi‐circular contour of drill no. 42/43 (± 0.4 mm)	18. PC is no more than 0% in the first and last segments (too much/too little reduction) of the preparation type
Margin Quality
19. outline is smooth and clearly circumscribed	19. Under margin quality, PC indicates a maximum of 0% warning
Surface Quality
20. smooth preparation (no pitting or grooves) with rounded transitions	20. Under surface quality, PC indicates a maximum of 0% warning.
	NB Despite the maximum of 0%, PC may still colour the preparation. Although this falls within the margins, it is an indication that the work could be improved