Table 2.
Summary of maximum wear depth, mean wear depth, and wear area at 1 to 5 years for the enamel-enamel controls and the enamel opposing 3Y-TZP. In contrast to the number of teeth evaluated for each group (n), N gives the total number of teeth for which the respective wear data was available
| Recall | Teeth | Variables | Enamel-Enamel | Enamel-3Y-TZP |
|---|---|---|---|---|
| [years] | n | (n = 16) | (n = 8) | |
| 1 | 24 | Maximum wear depth [µm] | ||
| N | 16 | 8 | ||
| Mean (SD) | -44 (74) | -119 (163) | ||
| Median (IQR) | -15 (-23, -15) | -52 (-111, -39) | ||
| Range | -305, -15 | -508, -15 | ||
| Mean wear depth [µm] | ||||
| N | 16 | 6 | ||
| Mean (SD) | -23 (16) | -57 (41) | ||
| Median (IQR) | -15 (-21, -15) | -39 (-72, -34) | ||
| Range | -67, -15 | -121, -15 | ||
| Wear area [mm²] | ||||
| N | 4 | 7 | ||
| Mean (SD) | 4.3 (6.3) | 2.0 (3.6) | ||
| Median (IQR) | 1.5 (0.8, 5.0) | 0.2 (0.1, 1.8) | ||
| Range | 0.4, 13.7 | 0.1, 10.0 | ||
| 2 | 24 | Maximum wear depth [µm] | ||
| N | 16 | 8 | ||
| Mean (SD) | -74 (83) | -148 (157) | ||
| Median (IQR) | -49 (-85, -15) | -89 (-169, -64) | ||
| Range | -348, -15 | -510, -15 | ||
| Mean wear depth [µm] | ||||
| N | 16 | 8 | ||
| Mean (SD) | -39 (22) | -59 (34) | ||
| Median (IQR) | -36 (-49, -15) | -46 (-76, -40) | ||
| Range | -82, -15 | -126, -15 | ||
| Wear area [mm²] | ||||
| N | 11 | 7 | ||
| Mean (SD) | 3.6 (5.9) | 3.5 (4.9) | ||
| Median (IQR) | 0.9 (0.3, 3.0) | 1.9 (0.7, 3.2) | ||
| Range | 0.1, 18.3 | 0.2, 14.1 | ||
| 3 | 24 | Maximum wear depth [µm] | ||
| N | 16 | 8 | ||
| Mean (SD) | -64 (51) | -196 (164) | ||
| Median (IQR) | -51 (-85, -15) | -127 (-291, -77) | ||
| Range | -197, -15 | -507, -48 | ||
| Mean wear depth [µm] | ||||
| N | 16 | 8 | ||
| Mean (SD) | -36 (17) | -68 (35) | ||
| Median (IQR) | -38 (-48, -15) | -58 (-74, -43) | ||
| Range | -67, -15 | -133, -38 | ||
| Wear area [mm²] | ||||
| N | 11 | 8 | ||
| Mean (SD) | 2.3 (2.4) | 6.0 (6.8) | ||
| Median (IQR) | 1.1 (0.6, 3.1) | 2.5 (1.2, 9.9) | ||
| Range | 0.1, 6.7 | 0.3, 18.5 | ||
| 4 | 24 | Maximum wear depth [µm] | ||
| N | 16 | 8 | ||
| Mean (SD) | -120 (133) | -212 (175) | ||
| Median (IQR) | -77 (-120, -42) | -133 (-353, -103) | ||
| Range | -487, -15 | -511, -15 | ||
| Mean wear depth [µm] | ||||
| N | 16 | 8 | ||
| Mean (SD) | -48 (26) | -73 (39) | ||
| Median (IQR) | -47 (-58, -33) | -68 (-82, -55) | ||
| Range | -104, -15 | -142, -15 | ||
| Wear area [mm²] | ||||
| N | 12 | 7 | ||
| Mean (SD) | 4.2 (4.6) | 8.8 (9.4) | ||
| Median (IQR) | 2.6 (1.5, 4.3) | 4.1 (1.5, 15.4) | ||
| Range | 0.3, 15.6 | 0.6, 22.9 | ||
| 5 | 24 | Maximum wear depth [µm] | ||
| N | 16 | 8 | ||
| Mean (SD) | -135 (129) | -229 (174) | ||
| Median (IQR) | -84 (-161, -47) | -162 (-378, -102) | ||
| Range | -393, -15 | -520, -48 | ||
| Mean wear depth [µm] | ||||
| N | 16 | 8 | ||
| Mean (SD) | -54 (30) | -77 (38) | ||
| Median (IQR) | 48 (-56, -40) | -65 (-94, -51) | ||
| Range | -127, -15 | -146, -37 | ||
| Wear area [mm²] | ||||
| N | 14 | 8 | ||
| Mean (SD) | 5 (6) | 9 (10) | ||
| Median (IQR) | 4 (1, 6) | 4 (2, 17) | ||
| Range | 0, 21 | 0, 24 |
SD = Standard deviation, IQR = Interquartile range