Histological Study on the Postnatal Development and Sequence of Eruption of the Mandibular Cheek-Teeth of Rabbits (Oryctolagus cuniculus)

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Abstract
The postnatal development and sequence of eruption of mandibular cheek teeth of rabbits were studied by histological methods. Hemi-mandibles were dissected and sectioned in longitudinal sections of 7 .mu. and stained with hematoxylin-eosin and Masson''s trichrome. The presence of 2 mandibular deciduous molars [M] which are replaced by corresponding premolars [P] and of 3 mandibular permanent monofisary molars was confirmed. Eruption of deciduous molars of the mandible began at 4 days after birth and the mandibular permanent molars at 9 days, while that of mandibular premolars occurred at 23 days, replacing the mandibular deciduous molars which had exfoliated. At 32 days all the mandibular permanent cheek-teeth were erupted. At birth the mandibular deciduous molars were completely developed and at 4 days their root resorption was initiated. At the 1st day P3 was in the bell stage and the P4 had begun dentinogenesis. In M1 and M2 amelogenesis was observed.

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