Table 1.
Descriptive characteristics of the matched groups and comparison of the prosthesis failure rates between bruxers and nonbruxers.
| Bruxers | Nonbruxers | P value | |
|---|---|---|---|
| FDP (N) | 62 | 62 | |
| Sex (number of FDP) | Woman (44) | Woman (44) | |
| Man (18) | Man (18) | ||
| Prosthetic units (number of FDP) | 3 (40), 4 (16), 5 (4), 6 (2) | 3 (40), 4 (16), 5 (4), 6 (2) | |
| Patients' age† (years), mean ± SD (min-max) | 57.8 ± 11.7 (31.9–81.5) | 58.3 ± 11.1 (37.7–84.3) | 0.729†† |
| Follow-up (months), mean ± SD (min-max) | 110.1 ± 66.6 (15.3–262.1) | 106.5 ± 66.7 (6.0–259.3) | 0.767‡‡ |
| Smoking (number of FDP)‡ | 0.743§§ | ||
| No | 20 | 13 | |
| Current + former smokers | 15 | 17 | |
| FDP failure, N (%) | 20 (32.3) | 16 (25.8) | 0.001§§ |
| Sex, N/total (%) | |||
| Woman | 12/44 (27.3) | 10/44 (22.7) | 0.002§§ |
| Man | 8/18 (44.4) | 6/18 (33.3) | 0.503§§ |
| Smoking, N/total (%)‡ | |||
| No | 5/20 (25.0) | 4/13 (30.8) | 0.019§§ |
| Current + former smokers | 6/15 (40.0) | 7/17 (41.2) | 0.804§§ |
| Prosthesis location, N/total (%) | |||
| Maxilla | 12/37 (32.4) | 6/39 (15.4) | 0.002§§ |
| Mandible | 8/25 (32.0) | 10/23 (43.5) | 0.383§§ |
| Area of placement, N/total (%) | |||
| Anterior | 3/8 (37.5) | 1/8 (12.5) | 0.219§§ |
| Posterior | 15/38 (39.5) | 10/31 (32.3) | 0.035§§ |
| Anterior/posterior | 2/16 (12.5) | 5/23 (21.7) | 0.064§§ |
| Abutments, N/total (%) | |||
| All abutments vital | 6/31 (19.4) | 6/41 (14.6) | 0.001§§ |
| Vital and nonvital abutments | 13/27 (48.1) | 10/20 (50.0) | 0.541§§ |
| All abutments nonvital | 1/4 (25.0) | 0/1 (0) | 0.250§§ |
| FDPs with post and core in nonvital abutments, N/total (%)§ | |||
| No | 3/12 (25.0) | 6/11 (54.5) | 0.727§§ |
| Yes | 11/19 (57.9) | 4/10 (40.0) | 0.332§§ |
| Position nonvital abutment, N/total (%) | |||
| Mesial | 9/14 (64.3) | 2/6 (33.3) | 0.267§§ |
| Distal | 2/10 (20.0) | 7/12 (58.3) | 0.453§§ |
| Mesial and distal | 2/5 (40.0) | 0/2 (0) | 1.000§§ |
| Middle | 1/2 (50.0) | 1/1 (100) | 1.000§§ |
| Material, N/total (%)¶ | |||
| Gold ceramic | 16/38 (42.1) | 7/38 (18.4) | 0.040§§ |
| CoCr ceramic | 4/16 (25.0) | 8/18 (44.4) | 0.180§§ |
| Treatment provider, N/total (%) | |||
| Dental student | 15/45 (33.3) | 10/51 (19.6) | 0.001§§ |
| General or specialist dentist | 5/17 (29.4) | 6/11 (54.5) | 1.000§§ |
| FDPs with at least one complication (N) | 27 | 22 | 0.111§§ |
| Complications (N) | |||
| Technical | <0.001§§ | ||
| Major chipping | 3 | 0 | |
| Loss of retention | 8 | 6 | |
| Prosthesis replacement | 7 | 3 | |
| Tooth fracture | 2 | 1 | |
| Biological | <0.001§§ | ||
| Loss of tooth vitality | 7 | 8 | |
| Recurrent caries | 12 | 7 | |
| Periapical destruction | 2 | 1 | |
| Technical/biological | <0.001§§ | ||
| Tooth loss | 8 | 5 |
FDP, fixed dental prosthesis. †On the day of prosthesis delivery. ‡Information not available for all patients. §Only for the prostheses that had at least one nonvital abutment tooth. ¶Analysis done only for the most prevalent materials used. ††Wilcoxon signed rank test. ‡‡Paired-samples t-test. §§McNemar's test.