Fig. 11.1

Two models of tooth development. (a) Archer’s (1974) illustration of tooth formation at three successive stages (2–4) in the lower jaw. The swelling marked A is a future primary tooth that initially forms at the free edge of the dental lamina but moves upward along the buccal side of the lamina as it develops. A΄ represents the successor tooth to A, and B represents the next posterior primary tooth. This depiction of successional tooth formation from the primary dental lamina is not consistent with current understanding. The small animal figure shows orientation. (b) Luckett’s (1993) illustration of eutherian tooth development at five successive stages, including bud (A), cap (B) and bell (C–D). The successional tooth develops from a successional lamina (SL) extending from the dental lamina (DL). Abbreviations: AM = ameloblasts; D = dentine; DP = dermal papilla; DL = dental lamina; E = enamel; IEE = inner enamel epithelium; Od = odontoblasts; OE = oral epithelium; OEE = outer enamel epithelium; SL = successional lamina; TB = tooth bud. [(a) Reprinted by permission of Michael Archer from Archer M (1984a). (b) Reprinted by permission of Springer Nature from Luckett (1993).]