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Interactions between the epithelium and mesenchyme were very important in tooth development. When these relationships changed qualitatively or quantitatively, developmental tooth abnormalities or odontogenic lesions might develop. In order to clarify this hypothesis, we examined the effects of discrepancy in the number of enamel organs and dental papilla on histo- and morpho-differentiation of the recombinants by renal subcapsular transplantation. Five kinds of recombinants were prepared from the enamel organs(E) and dental papilla (M) of the mandibular first molars of 17-gestational-day C3H mice: group 1 (E/M = 2/6), group 2(E/M = 3/5), group 3(E/M = 4/4), group 4 (E/M = 5/3) and group 5 (E/M = 6/2). After 28 days of transplantation, all the grafts were harvested and examined roentogenographically and histopathologically. All the grafts developed into teeth. The teeth of groups 1 and 5 were independent from each other and the teeth of groups 2, 3 and 4 fused with each other by dentin. The number and size of the teeth depend on the number of M and the differences between E and M of the recombinants, respectively. The smaller the difference, smaller was the teeth size. The cysts lined by the keratinizing squamous epithelium developed from E-rich recombinants. These could be comparative to the compound odontoma, fused teeth and odontogenic keratocyst of the human being respectively. It might be speculated that the histogenesis of these lesions might be related to the quantitative change in the epithelial-mesenchymal interactions of odontogenesis.

Recombinant Study of Mouse Enamel Organ and Dental Papilla by Renal Transplantation: Effects of Discrepancy in Number of These Two Components.