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Mean retention force (Mean) and standard deviation (SD) expressed in Newtons for the different material groups (DECBL = Denzir sandblasted; DECUNBL= un-sandblasted; PROCERA) and storage times (Months). The results are based on pooling the values for the two storage media.
| Material | Months | N | Mean ± SD |
| DECBL | 0.5 | 6 | 1358.8 ± 486.5 |
| DECBL | 12 | 6 | 2108.7 ± 1351.6 |
| DECUNBL | 0.5 | 6 | 1587.3 ± 558.8 |
| DECUNBL | 12 | 6 | 2153.5 ± 722.8 |
| PROCERA | 0.5 | 6 | 1512.8 ± 662.2 |
| PROCERA | 12 | 6 | 1818.2 ± 524.5 |
N = number of samples
