Fig. 5.

Stress–strain curves of the PDL at different loading rates. a Stress–strain curves of central incisor at cervical level; b stress–strain curves of lateral incisor at cervical level; c stress–strain curves of central incisor at middle level; d stress–strain curves of lateral incisor at middle level; e stress–strain curves of central incisor at root level; f stress–strain curves of lateral incisor at root level