Table 5 Multivariate logistic Regression for the association of the dependent variable "apical periodontitis" with a number of explanatory variables (coronal restoration quality, coronal restoration type, gingival status, CL II cavity design, root canal filling quality)
| Â | Apical periodontitis (%) | OR | 95% CI | P value |
|---|---|---|---|---|
Coronal restoration quality | ||||
 Inadequate | 153 (76.9%) | 2.16 | 1.16–4.04 | 0.01 |
Coronal Restoration type | ||||
 Temporary or absent | 20 (90.9%) | 1 |  |  |
 Filling inserted during plastic phase | 169 (76.3%) | 0.36 | 0.06–1.97 | 0.24 |
 Full coverage crown | 69 (81.2%) | 0.79 | 0.13–4.83 | 0.80 |
Gingival status | ||||
 Gingival inflammation | 126 (78.3%) | 2.05 | 1.08–3.91 | 0.02 |
Cavity design | ||||
 CL II | 113 (70.6%) | 0.82 | 0.49–1.35 | 0.44 |
Root canal filling quality | ||||
 Under and over-filling | 218 (60.8%) | 1.93 | 1.24–3.01 | 0.004 |
 Inadequate homogeneity | 247 (69%) | 2.50 | 1.41–4.44 | 0.002 |
 Inadequate conicity | 251 (70.1%) | 1.57 | 0.87–2.81 | 0.12 |