TABLE 1.
Descriptive data of the single crowns included in the study, with follow‐up time according to the different factors. The descriptive unit is the crown, not the patient
| Factor | Number of single crowns (%) | Number of failed single crowns | Follow‐up time (months) Mean ± SD (min–max) |
|---|---|---|---|
| Sex | |||
| Male | 506 (48.8) | 114 | 129.0 ± 83.0 (6.2–360.7) |
| Female | 531 (51.2) | 116 | 140.3 ± 77.1 (6.0–355.4) |
| Age | |||
| <50 years | 309 (29.8) | 86 | 159.2 ± 79.6 (6.2–333.6) |
| ≥50 years | 728 (70.2) | 144 | 124.4 ± 78.3 (6.0–360.7) |
| Jaw | |||
| Maxilla | 605 (58.3) | 150 | 128.9 ± 80.4 (6.0–355.4) |
| Mandible | 432 (41.7) | 80 | 143.1 ± 79.3 (6.9–360.7) |
| Crown region | |||
| Anterior | 282 (27.2) | 70 | 115.4 ± 74.1 (6.0–335.1) |
| Posterior | 755 (72.8) | 160 | 142.0 ± 81.3 (6.2–360.7) |
| Tooth type | |||
| Incisor | 217 (20.9) | 56 | 117.6 ± 73.6 (6.0–335.1) |
| Canine | 65 (6.3) | 14 | 108.0 ± 75.8 (9.2–298.9) |
| Premolar | 391 (37.7) | 83 | 138.6 ± 81.5 (6.8–360.7) |
| Molar | 364 (35.1) | 77 | 145.8 ± 80.9 (6.2–316.0) |
| Tooth vitality | |||
| Non‐vital | 544 (52.5) | 149 | 136.6 ± 79.7 (6.2–360.7) |
| Vital | 493 (47.5) | 81 | 132.8 ± 80.8 (6.0–132.8) |
| Post and core a | |||
| No | 71 (13.1) | 18 | 112.1 ± 71.7 (7.0–290.5) |
| Yes | 472 (86.9) | 131 | 140.0 ± 80.2 (6.2–360.7) |
| Material | |||
| All‐ceramic | 169 (16.3) | 26 | 81.5 ± 65.4 (6.3–234.8) |
| High‐noble gold ceramic | 678 (65.4) | 171 | 158.1 ± 72.6 (7.3–360.7) |
| Full gold | 68 (6.5) | 14 | 143.1 ± 81.9 (8.4–143.1) |
| CoCr ceramic | 122 (11.8) | 19 | 74.3 ± 72.3 (6.0–262.5) |
| Crown occluding to b | |||
| Natural teeth | 591 (59.8) | 131 | 138.3 ± 79.4 (6.0–355.4) |
| Fixed prosthesis | 398 (40.2) | 99 | 127.8 ± 80.2 (6.2–360.7) |
| Treatment provider | |||
| Dental student | 836 (80.6) | 197 | 140.0 ± 77.3 (6.0–303.1) |
| General or specialist dentist | 201 (19.4) | 33 | 113.1 ± 88.2 (7.6–360.7) |
| Bruxism | |||
| No | 696 (67.1) | 141 | 141.9 ± 77.4 (6.0–360.7) |
| Yes | 341 (32.9) | 89 | 120.3 ± 83.9 (8.5–333.6) |
| Smoking c | |||
| No | 283 (50.6) | 61 | 135.5 ± 78.3 (6.8–316.0) |
| Yes | 191 (34.2) | 50 | 123.0 ± 82.9 (6.2–329.5) |
| Ex‐smoker | 85 (15.2) | 17 | 145.6 ± 80.2 (11.3–298.9) |
Abbreviation: SD, standard deviation.
a
Only for non‐vital teeth.
b
Few cases were not considered her: crowns opposed removable partial denture (n = 26), and not occluding to anything (n = 22).
c
For the cases in which information on smoking habits was available.