Table 2.
Edge chip results†
| Material | Test piece | IndenterX | N XX | Edge Toughness Te, slope of linear eq.1 (N/mm) | Edge strength SE(0.5) (N) calculated* | Hardness (GPa) |
|---|---|---|---|---|---|---|
|
| ||||||
| PMMA SR Vivodent Plus DCL |
Wear block | 120° SC | 18 | 475 (44) | 238 | 0.337 (0.014) |
| Knoop | 32 | 642 (108) | 321 | 0.225 (0.005) | ||
| Rockwell C | 7 | (535 ⊗) | - | 0.326 (0.007) | ||
|
| ||||||
| Mounted and flattened teeth | 120° SC | 13 | 500 (120) | 250 | - | |
|
| ||||||
| Combined wear block and teeth | 120° SC | 31 | 486 (51) | 243 | ||
|
| ||||||
| Composite I SR Phonares NHC |
Wear block | 120° SC | 25 | 249 (38) | 125 | 0.459 (0.009) |
| Vickers | 8 | (575 ⊗) | - | - | ||
| Knoop | 32 | 554 (63) | 277 | 0.302 (0.025) | ||
| Rockwell C | 17 | 412 (35) | 206 | 0.448 (0.009) | ||
|
| ||||||
| Mounted and flattened teeth | 120° SC | 15 | 251 (23) | 126 | - | |
|
| ||||||
| Combined wear block and teeth | 120° SC | 40 | 250 (22) | 125 | ||
|
| ||||||
| Composite II SR Phonares II |
Wear block-incisal | 120° SC | 26 | 470 (83) | 235 | 0.395 (0.007) |
| Knoop | 33 | 705 (60) | 358 | 0.280 (0.013) | ||
| Rockwell C | 16 | 587 (99) | 294 | 0.405 (0.006) | ||
|
| ||||||
| Wear block-dentin | 120° SC | 33 | 450 (61) | 225 | 0.380 (0.008) | |
| Vickers | 9 | (1600 ⊗) | - | - | ||
| Knoop | 31 | 596 (55) | 298 | 0.267 (0.018) | ||
| Rockwell C | 14 | 490 (69) | 245 | 0.395 (0.001) | ||
|
| ||||||
| Mounted and flattened teeth | 120° SC | 11 | 472 (311) | 236 | - | |
|
| ||||||
| Combined wear block and teeth | 120° SC | 70 | 462 (48) | 231 | - | |
| Knoop | 64 | 651 (47) | 326 | - | ||
| Rockwell C | 30 | 545 (63) | 273 | - | ||
†
Uncertainties, if available, are in parenthesis and are ± one standard deviation
X
SC denotes sharp conical
XX
N is the number of chips
*
eq. 1 with d = 0.5 mm
⊗
Data was very inconsistent. Most trials did not result in a chip.