Table 3.
The relationships among restoration size, classification, material, and crack.
| Restoration size in occlusal plane | Cavity classification |
Material |
Extending crack patterns in MIN |
||||||
|---|---|---|---|---|---|---|---|---|---|
| I | II | MOD | MIN | CR | AM | 1) | 2) | 3) | |
| <1/3 | 15 | 0 | 0 | 8 | 2 | 5 | 2 | 4 | 3 |
| 1/3–2/3a | 14 | 4 | 0 | 15 | 2 | 1 | 5 | 5 | 4 |
| >2/3b | 1 | 1 | 1 | 3 | 0 | 0 | 1 | 0 | 2 |
| Total | 30 | 5 | 1 | 26 | 4 | 6 | 8 | 9 | 9 |
MOD, Mesio-occluso-distal; MIN, Metal inlay; CR, composite resin; AM, amalgam. Note the significant difference (P < 0.01) between a and b in the extending crack pattern in the MIN group. 1), to the middle part of dentin; 2), to the deep part of dentin; 3), to the pulp.