Abstract

The early stages of tooth development were studied from serial sections of a series of guinea pig ( Cavia cobaya) embryos. The upper replacing cheek tooth developed from the dental lamina lying anterior to the deciduous molar it displaces; the lower replacing cheek tooth developed from the lingual downgrowth of dental lamina associated with the posterior half of the enamel organ of the deciduous molar it displaces. Enamel matrix was observed on the crowns of the deciduous molars, and there was no evidence of fusion of enamel organs during development of the anterior cheek teeth.

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