TABLE 3.
Comparison of cumulative abutment fracture rate according to different factors, and hazard ratio estimated from univariate Cox proportional hazard models at 9 years
| Factors | Univariate | |
|---|---|---|
| HR (95% CI) | p‐value | |
| Gender | ||
| Male | 1 | 0.047* |
| Female | 0.217 (0.048 ~ 0981) | |
| Age | ||
| Step by one | 1.007 (0.968 1.048) | 0.724 |
| Arch | ||
| Maxillary | 1 | 0.211 |
| Mandible | 2.120 (0.653 ~ 6.886) | |
| Position | ||
| Anterior | <0.001 (<0.001 ~ 107300) | 0.967 |
| Premolar | 0.251 (0.033 ~ 1.932) | 0.184 |
| Molar | 1 | |
| Type of prosthesis | ||
| ISC | 1 | 0.016* |
| IFPD | 0.156 (0.035 ~ 0.705) | |
| Cantilever | ||
| Yes | 0.048 (<0.001 ~ 292 939.886) | |
| No | 1 | 0.703 |
| Abutment design | ||
| Indexed (/X) | 5.855 (1.566 ~ 21.893) | 0.009* |
| Without indexed (C/) | 1 | |
| Abutment angulation | ||
| Yes | 0.863 (0.189 ~ 3.938) | 0.849 |
| No | 1 | |
| Opposing jaw | ||
| Natural tooth | 26.347 (<0.001 ~ 44 68 485.545) | 0.594 |
| Implant crown | 1.000 (<0.001 ~ 14 70 558.607) | 1.000 |
| Others | 1 | |
| Length | ||
| 8 mm | 1 | |
| 9.5 mm | 0.075 (0.008 ~ 0.679) | 0.021 |
| 11 mm | 0.264 (0.079 0.885) | 0.031 |
| 14 mm | <0.001 (<0.001 ~ −) | 0.980 |
| Diameter | ||
| 3.5 mm | 0.196 (0.054 ~ 0.714) | 0.013* |
| 4.5 mm | 1 | |
| Bone graft | ||
| Yes | 0.218 (0.028 ~ 1.676) | 0.143 |
| No | 1 | |
Abbreviations: CI, confidence interval; HR, hazard ratio.
*
p < 0.05.