Table 3.
Mean tensile strength ± SD, failure mode in restored dentin, and numbers of detached specimens during trimming of each group.
| Groups (n = 12) | Mean ± SD (MPa) | Failure mode in restored dentin (numbers of specimens) |
Numbers of detached specimens | |
|---|---|---|---|---|
| Cements | Prostheses | |||
| PanaviaFa | Metal | 4.3 ± 1.7 | A/D (2), A/D + Hs + R (7), A/P + Hs + R (2) | 1 |
| Composite | 5.7 ± 4.2 | A/D (2), A/D + Hs + R (7), A/P + Hs + R (3) | — | |
| Porcelain | 6.0 ± 3.0 | A/D + Hs + R (5), Hs + R (3), A/P + Hs + R (4) | — | |
|
| ||||
| Super-Bondb | Metal* | 9.2 ± 3.5 | A/P + R (12) | — |
| Composite | 11.7 ± 2.1 | R (2), A/P + R (10) | — | |
| Porcelain* | 12.5 ± 2.2 | R (2), A/P + R (10) | — | |
|
| ||||
| Single-Bondc | Metal | 2.2 ± 1.2 | A/D (8), A/P (2) | 2 |
| Composite | 1.3 ± 1.1 | A/D (9) | 3 | |
| Porcelain | 1.5 ± 1.0 | A/D (9) | 3 | |
|
| ||||
| Variolink IIa | Metal | 2.0 ± 1.3 | A/D (10) | 2 |
| Composite | 3.9 ± 4.0 | A/D (10) | 2 | |
| Porcelain | 5.0 ± 3.6 | A/D (9), A/P + R (2) | 1 | |
a,b,cSignificant differences in tensile strength between cements indicated by the different superscripts (P < 0.05).
*Differences in tensile strength between prostheses are significant.
A/D = adhesive failure at dentin side interface, A/P = adhesive failure at prosthesis side interface, R = cohesive failure in resin, Hs = cohesive failure in hybridized smear, and + = mixed failure.