Anatomy and Embryology

, Volume 155, Issue 2, pp 221–240 | Cite as

Development of human first and second permanent molar, with special reference to the distal protion of the dental lamina

  • Tadahiro Ooë
Article
Accepted:

Summary

Serial sections of pre- and postnatal human jaws were examined to document the development of the first and second permanent molars and related dental laminae. The results are summarized as follows:
  1. 1.

    The first permanent molar develops as an epithelial thickening on the distal extension of the dental lamina in the 100–110 mm fetus, reaches the capstage in the 140 mm fetus and the succeeding lamina (abortive successor) is defined in the 195–215 mm fetus. The lateral enamel strands are more extensive in the mandible than in the maxilla. The connecting bridge is nothing more than the epithelial connection of the most ligual of the lateral enamel strads.

     
  2. 2.

    At birth the dental lamina ends on the mesial part of the first permanent molar, attached to it through the lateral enamel strands and the connecting bridge. In the maxilla the attachment through the former is almost lost.

     
  3. 3.

    In the latter half of the first year, with the reduction of the distal inclination of the first permanent molar, the dental lamina separates from it and extends distally. There is no doubt that the first permanent molar belongs to the first dentition.

     
  4. 4.

    The degenerative successor of the first permanent molar is discernible even in the specimens with later stages of the second permanent molar. Therefore, the second permanent molar also seems to belong to the first dentition.

     

Key words

Odontogenesis Tooth germ Molar Man 
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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Tadahiro Ooë
    • 1
  1. 1.Department of Anatomy, Faculty of MedicineUniversity of TokyoTokyoJapan

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