A scanning electron microscope study of aberrations in the prism pattern of rat incisor inner enamel
Article first published online: 3 FEB 2005
Copyright © 1979 Wiley-Liss, Inc.
American Journal of Anatomy
Volume 154, Issue 3, pages 419–435, March 1979
How to Cite
Risnes, S. (1979), A scanning electron microscope study of aberrations in the prism pattern of rat incisor inner enamel. Am. J. Anat., 154: 419–435. doi: 10.1002/aja.1001540307
- Issue published online: 3 FEB 2005
- Article first published online: 3 FEB 2005
- Manuscript Accepted: 25 SEP 1978
- Manuscript Received: 6 JUL 1978
The prism pattern in the inner enamel of adult rat incisors was studied with the SEM in unfixed tissues that had been sectioned, ground, polished, and etched. Six different types of aberrations in the prism pattern were encountered: 1. Prism lamellae may be shorter than the mesio-lateral width of enamel. 2. Prism lamellae may deviate from a transverse orientation. 3. Prism lamellae may “fuse” or “bifurcate.” 4. Prisms of two adjacent lamellae may pursue a common course. 5. Prisms may change direction. 6. Variations exist in the outline of transversely cut prism profiles. Aberrations were observed at any distance from the dentino-enamel junction.
These observations were used as a basis for an analysis of the movement of ameloblasts during rat incisor amelogenesis. It was concluded that it is physically possible for the ameloblasts to create the observed aberrations as they move along the path of the prisms. However, the aberrations seem to make it more difficult to understand the factors controlling ameloblast movement. Occasionally crystallite bridges connecting adjacent prisms were observed. A configuration resembling a bifurcating prism is presented.