Fig. 2From: The effect of different ferrule heights and crown-to-root ratios on fracture resistance of endodontically-treated mandibular premolars restored with fiber post or cast metal post system: an in vitro studySchematic diagram for the simulated crown lengthening method combined with ferrule designs in each subgroup (C: crown length above bone; R: root length in bone; CRR: crown-to-root ratio)Back to article page