Table 1.
Independent variables of the entire sample of 598 teeth, expressed as the absolute value (n) or proportion (%). At the patient level, out of 312 patients, 45.5% of the patients were men, and 54.5% were women. Out of these, 119 (38.1%) were diagnosed with bruxism, and 69 (22.1%) used a night guard. The mean age of the sample was 65.5 years (SD: 14.07). * n (87) refers to the number of teeth extracted for each category, ** n (73) refers to the number of unsuccessful teeth in each category
| Independent variables | n (598) | % | *n (87) Extraction |
**n (73) No success |
|---|---|---|---|---|
| Gender | ||||
| Female | 324 | 54.2 | 45 | 29 |
| Male | 274 | 45.8 | 42 | 44 |
| Bruxism | ||||
| Yes | 215 | 36 | 25 | 27 |
| No | 383 | 64 | 62 | 46 |
| Night guard | ||||
| Yes | 123 | 20.6 | 8 | 12 |
| No | 475 | 79.4 | 79 | 61 |
| Dental arch | ||||
| Maxillary | 347 | 58 | 51 | 40 |
| Mandibular | 251 | 42 | 36 | 33 |
| Type of tooth | ||||
| Incisors | 112 | 18.7 | 15 | 6 |
| Maxillary | 78 | 13 | 9 | 2 |
| Mandibular | 34 | 5.7 | 6 | 4 |
| Canines | 44 | 7.4 | 11 | 5 |
| Maxillary | 28 | 4.7 | 7 | 3 |
| Mandibular | 16 | 2.7 | 4 | 2 |
| Premolars | 175 | 29.3 | 22 | 24 |
| Maxillary | 92 | 15.4 | 14 | 12 |
| Mandibular | 83 | 13.9 | 8 | 12 |
| Molars | 267 | 44.6 | 39 | 38 |
| Maxillary | 149 | 24.9 | 21 | 29 |
| Mandibular | 118 | 19.7 | 18 | 9 |
| Endodontic treatment | ||||
| Manual | 199 | 33.3 | 46 | 33 |
| Rotatory | 399 | 66.7 | 39 | 40 |
| Pulp status | ||||
| Vital | 429 | 71.7 | 59 | 45 |
| Necrotic | 169 | 28.3 | 28 | 28 |
| Pre-operative radiographic radiolucency | ||||
| Yes | 295 | 49.3 | 57 | 53 |
| No | 303 | 50.7 | 30 | 20 |
| Post-operative radiographic radiolucency | ||||
| Yes | 22 | 96.3 | 82 | 22 |
| No | 576 | 3.7 | 4 | 51 |
| Probing pocket depth | ||||
| (1–3 mm) | 238 | 39.8 | 36 | 7 |
| (4–5 mm) | 263 | 44 | 33 | 21 |
| (≥ 6 mm) | 97 | 16.3 | 18 | 45 |
| Fibre post | ||||
| Yes | 193 | 32.3 | 15 | 17 |
| No | 405 | 67.7 | 72 | 56 |
| Cast metal post (precious alloy) | ||||
| Yes | 93 | 15.6 | 30 | 16 |
| No | 505 | 84.4 | 57 | 57 |
| Restoration | ||||
| Direct filling | 182 | 30.4 | 28 | 11 |
| Single crown | 217 | 36.2 | 28 | 31 |
| Dental bridge | 197 | 32.9 | 29 | 29 |
| Overdenture | 2 | 0.3 | 2 | 2 |
| Adjacent tooth | ||||
| Not present | 234 | 39.1 | 48 | 38 |
| Natural tooth | 220 | 36.8 | 21 | 21 |
| Crown or bridge | 125 | 20.9 | 17 | 14 |
| Overdenture or removable partial denture | 0 | 0 | 0 | 0 |
| Implant supported crown | 19 | 3.2 | 1 | 0 |
| Overlay/onlay | 0 | 0 | 0 | 0 |
| Pontic | 0 | 0 | 0 | 0 |
| Antagonist: | ||||
| Not present | 22 | 3.7 | 4 | 4 |
| Natural tooth | 337 | 56.4 | 35 | 32 |
| Crown or bridge | 193 | 32.3 | 39 | 37 |
| Overdenture or removable partial denture | 4 | 0.7 | 3 | 0 |
| Implant supported crown | 13 | 2.2 | 0 | 0 |
| Overlay/onlay | 4 | 0.7 | 1 | 0 |
| Pontic | 25 | 4.2 | 5 | 0 |