Table 3.
Tooth-level characteristics of subjects with a cracked tooth, overall and according to whether cracked tooth was symptomatic.
| Tooth-level characteristic1 | All | Symptomatic | ||
|---|---|---|---|---|
| N | Col2 % | N | Row3 % | |
| Molar | 2,420 | 81% | 1,176 | 49% |
| Premolar | 555 | 19% | 188 | 34% |
| P4 <0.001 | ||||
| Mandibular | 1,734 | 58% | 787 | 45% |
| Maxillary | 1,241 | 42% | 577 | 46% |
| P = 0.8 | ||||
| 2 or more restorations present | 622 | 21% | 292 | 47% |
| 0 or 1 restoration present | 2,353 | 79% | 1,072 | 46% |
| P = 0.7 | ||||
| 3 or more external cracks | 1,049 | 35% | 508 | 48% |
| 1 or 2 external cracks | 1,926 | 65% | 856 | 44% |
| P = 0.04 | ||||
| In occlusion w/opposing tooth | 2,903 | 98% | 1,334 | 46% |
| Not in occlusion w/opposing tooth | 72 | 2% | 30 | 42% |
| P = 0.3 | ||||
| Wear facet through enamel | 709 | 24% | 346 | 49% |
| No wear facet through enamel | 2,266 | 76% | 1,018 | 45% |
| P = 0.03 | ||||
| Exposed roots | 672 | 23% | 290 | 43% |
| No exposed roots | 2,303 | 77% | 1,074 | 47% |
| P = 0.048 | ||||
| Caries present | 330 | 11% | 180 | 55% |
| No caries present | 2,645 | 89% | 1,184 | 45% |
| P = 0.003 | ||||
| RPD abutment | 22 | 1% | 6 | 27% |
| No RPD abutment | 2,953 | 99% | 1,358 | 46% |
| P = 0.12 | ||||
| FPD abutment | 3 | 0% | 3 | 100% |
| No FPD abutment | 2,972 | 100% | 1,361 | 46% |
| Not estimable | ||||
| NCCL present | 267 | 9% | 100 | 37% |
| No NCCL present | 2,708 | 91% | 1,264 | 47% |
| P = 0.009 | ||||
| Partial tooth fracture | 80 | 3% | 44 | 55% |
| No partial tooth fracture | 2,895 | 97% | 1,320 | 46% |
| P = 0.5 | ||||
| Complete tooth fracture | 17 | 1% | 6 | 35% |
| No complete tooth fracture | 2,958 | 99% | 1,358 | 46% |
| P = 0.5 | ||||
| Opposing tooth | ||||
| Natural or restored tooth | 2,689 | 90% | 1,203 | 45% |
| Not natural or restored tooth | 286 | 10% | 161 | 56% |
| P = 0.9 | ||||
| Implant restored crown | 13 | 0% | 5 | 38% |
| No implant restored crown | 2,962 | 100% | 1,359 | 46% |
| P = 0.6 | ||||
| Fixed partial denture (bridge) pontic | 13 | 0% | 4 | 31% |
| No fixed partial denture (bridge) pontic | 2,962 | 100% | 1,360 | 46% |
| P = 0.7 | ||||
| Removable full or partial denture | 216 | 7% | 133 | 62% |
| No removable full or partial denture | 2,759 | 93% | 1,231 | 45% |
| P = 0.9 | ||||
| No opposing tooth | 47 | 2% | 19 | 40% |
| Has an opposing tooth | 2,928 | 98% | 1,345 | 46% |
| P = 0.9 | ||||
| Radiograph | ||||
| Evidence of crack(s) on radiograph | 72 | 2% | 44 | 61% |
| No evidence of crack(s) on radiograph | 2,903 | 98% | 1,320 | 45% |
| P = 0.09 | ||||
| Evidence of periradicular lucency | 8 | 0% | 6 | 75% |
| No evidence of periradicular lucency | 2,967 | 100% | 1,358 | 46% |
| P = 0.2 | ||||
| No crack-related findings on radiograph | 2,773 | 93% | 1,272 | 46% |
| Crack-related findings on radiograph | 202 | 7% | 92 | 46% |
| P = 0.9 | ||||
| No radiograph taken past 12 months | 130 | 4% | 48 | 37% |
| Had a radiograph taken past 12 months | 2,845 | 96% | 1,316 | 46% |
| P = 0.1 | ||||
1
RPD: Removable partial denture, FPD: Fixed partial denture (bridge), NCCL: Non-carious cervical lesion.
2
Col: Column percent.
3
Percent symptomatic within level of tooth characteristic.
4
Significance of differences in proportions symptomatic adjusted only for clustering using generalized estimating equations.