Table 4.
Crack-level characteristics of subjects with a cracked tooth, overall and according to whether cracked tooth was symptomatic.
| Crack-level characteristic | All | Symptomatic | ||
|---|---|---|---|---|
| N | Col1% | N | Row2% | |
| At least 1 crack stained | 2,410 | 81% | 1,093 | 45% |
| No cracks were stained | 565 | 19% | 271 | 48% |
| P3 = 0.01 | ||||
| At least 1 crack detectable with explorer | 2,065 | 69% | 954 | 46% |
| No cracks were detectable with explorer | 910 | 31% | 410 | 45% |
| P = 0.3 | ||||
| At least 1 crack blocked transilluminated light | 1,925 | 65% | 940 | 49% |
| No cracks blocked transilluminated light | 1,050 | 35% | 424 | 40% |
| P = 0.006 | ||||
| At least 1 crack connect ed with a restoration | 2,169 | 73% | 1,013 | 47% |
| No cracks connected with a restoration | 806 | 27% | 352 | 44% |
| P = 0.5 | ||||
| At least 1 crack connect ed with another crack | 140 | 5% | 78 | 56% |
| No cracks connected with another crack | 2,835 | 95% | 1,286 | 45% |
| P = 0.2 | ||||
| At least 1 crack extended to root | 327 | 11% | 159 | 49% |
| No cracks extended to root | 2,648 | 89% | 1,205 | 46% |
| P = 0.045 | ||||
| At least 1 crack in horizontal direction | 947 | 32% | 453 | 48% |
| No cracks in horizontal direction | 2,028 | 68% | 911 | 45% |
| P = 0.1 | ||||
| At least 1 crack in vertical direction | 2,766 | 93% | 1,277 | 46% |
| No cracks in vertical direction | 209 | 7% | 88 | 42% |
| P = 0.08 | ||||
| At least 1 crack in oblique direction | 291 | 10% | 143 | 49% |
| No cracks in oblique direction | 2,684 | 90% | 1,221 | 45% |
| P = 0.8 | ||||
| Cracks are in more than 1 direction | 434 | 15% | 207 | 48% |
| All cracks in same direction | 2,541 | 85% | 1,157 | 46% |
| P = 0.1 | ||||
| Surfaces involved | ||||
| At least 1 crack involved mesial | 1,355 | 45% | 641 | 47% |
| No crack involved mesial | 1,620 | 54% | 724 | 45% |
| P = 0.8 | ||||
| At least 1 crack involved occlusal | 1,316 | 44% | 626 | 48% |
| No crack involved occlusal | 1,659 | 56% | 738 | 44% |
| P = 0.3 | ||||
| At least 1 crack involved distal | 1,497 | 50% | 750 | 50% |
| No crack involved distal | 1,478 | 50% | 614 | 42% |
| P < 0.001 | ||||
| At least 1 crack involved facial | 1,462 | 49% | 661 | 45% |
| No crack involved facial | 1,513 | 51% | 703 | 46% |
| P = 0.9 | ||||
| At least 1 crack involved lingual | 1,521 | 51% | 727 | 48% |
| No crack involved lingual | 1,454 | 49% | 637 | 44% |
| P = 0.2 | ||||
| At least 1 crack involved more than 1 surface | 1,063 | 36% | 499 | 47% |
| No crack involved more than 1 surface | 1,912 | 64% | 865 | 45% |
| P = 0.4 | ||||
1
Col: Column percents not summing to 100 due to rounding
2
Percent symptomatic within level of crack characteristic
3
Significance of differences in proportions symptomatic adjusted only for clustering using generalized estimating equations