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Mean retentive forces (Mean) and standard deviations (SD) of the different material groups (DECBL = Denzir sandblasted; DECUNBL= un-sandblasted; PROCERA) expressed in Newtons. The values are based on pooling the values generated at the two storage times and the two storage media.
| Material | Mean ± SD | N | Duncan Grouping |
| DECUNBL | 1870.4 ± 683.2 | 12 | A |
| DECBL | 1733.8 ± 1044.7 | 12 | A |
| PROCERA | 1665.5 ± 591.4 | 12 | A |
N = number of samples
