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Mean ± SD for fracture resistance in N for study groups
| 3u-30 | 1835.5 ± 241.7a | 4u-30 | 1346 ± 251.3A |
| 3u-50 | 2334 ± 383.9b | 4u-50 | 1698.7 ± 355.7B |
| 3u-80 | 2432.5 ± 382.4b | 4u-80 | 1703.1 ± 276.6B |
SD, standard deviation. Different superscript letters indicate significant difference between study groups in the same column. Capital superscript letters indicate significant difference between study groups in the same row
