(c).
| Connecting letters report | |||||
| level | Mean | ||||
|
| |||||
| Easy-graft CRYSTAL_SP | A | 52.50 | |||
| Easy-graft CLASSIC + PRF_SP | B | 46.89 | |||
| Easy-graft CLASSIC_SP | C | 42.51 | |||
| ContrGroupNativeBone Front-Canine_SP | D | 27.87 | |||
Levels not connected by same letter are significantly different.
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