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The Teeth of the Horse: Evolution and Anatomo‐Morphological and Radiographic Study of Their Development in the Foetus
Author(s) -
Soana S.,
Gnudi G.,
Bertoni G.
Publication year - 1999
Publication title -
anatomia, histologia, embryologia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.34
H-Index - 35
eISSN - 1439-0264
pISSN - 0340-2096
DOI - 10.1046/j.1439-0264.1999.00204.x
Subject(s) - mandible (arthropod mouthpart) , maxilla , skull , molar , incisor , dentistry , medicine , radiography , anatomy , ossification , biology , botany , radiology , genus
The aim of this work was to study the ontogenetic process in teeth from their early appearance in the ossifying matrix of the mandible and maxilla, in different foetuses of scalar ages. Radiographic examinations of the skull and mandible hemisections were performed and the latero‐medial (LM) and dorso‐ventral (DV) projections for the skull and mandible were analysed. A high‐definition film‐screen combination was used for this study. The exposure values ranged from 35 kV/6 mAs to 58 kV/10 mAs, according to the size of the skulls and their degree of ossification. The first dental germ observed was the P3, at 138–140 days of pregnancy. At 146 days, P2 and P4 dental germs were visible. At 160–168 days, the dental germ of the first deciduous incisor tooth (I1) appeared; at 180–188 days of pregnancy the germ of the second (I2), and at 224 days the germ of the third (I3), were detectable. At 275 days the dental germ of the mandibular first molar tooth (M1) appeared, while the maxillar M1, which was not visible radiographically, was represented by a jelly‐like amorphous body within its alveolar cavity.