BONE REMODELING IN DENTAL ERUPTION AND SHEDDING 



333 



sorption of first the socket and then the roots of the primary tooth 

 (Figs. 12 and 13), and it begins with the eruption of the permanent 

 successor. As the permanent tooth moves toward the oral cavity, 

 pressure is brought to bear, first upon the alveolar bone tissue which 

 surrounds the deciduous roots and then on the roots of the decidu- 

 ous teeth (Fig. 14). In the connective tissue intervening between 

 these structures, osteoclasts (or odontoclasts) differentiate and the 

 resorption of the bony socket as well as the root can be seen. One 

 can see such areas as irregular, deep excavations in the root surface 



Fig. 13. Not only has the permanent cuspid (left) produced resorption of 

 a part of the socket of the deciduous tooth, but the root of the latter is also 

 undergoing resorption. (X 6.) 



