274 MICROSCOPIC ANATOMY OF THE TEETH 



There is, we think, no doubt that bundles of connective- 

 tissue fibres, which pass into the dentine as Von Korff 

 describes, are to be seen in developing teeth, but, as Von 

 Ebner says, they do not course parallel to the dentinal 

 tubes as claimed by Von Korff, but pass within the dentine 

 generally at right angles to the tubes. These corkscrew-like 

 bundles of connective tissue are occasionally seen in the 

 pulps of fully erupted teeth (fig. 175). 



Studnicka adduces, as an example of the share of the pulp 

 in dentine formation, the fibre bundles occasionally observed 

 in growing dentine, which are identical in appearance with 



P 



FIG. 175. Corkscrew-like fibres in human permanent tooth. 

 d. Dentine ; p. pulp. ( x 250.) 



those described by Von Korff in early stages of development, 

 and which are more to be compared with the Sharpey fibres 

 in bone. Von Ebner considers that the fact that in the later 

 stages of dentine formation gelatine yielding bundles of 

 connective tissue incorporated in the dentine are to be seen, 

 which, as he says, he and the present author independently 

 observed, has no direct bearing upon the typical first 

 development of the dentine. He also looks upon these 

 gelatine-containing bundles as analogous to the penetrating 

 fibres of Sharpey. 



The fibres described by Von Korff in developing teeth 

 are not gelatine-yielding fibres and do not show double 

 refraction, and we must conclude they are to be looked upon 



