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A MANUAL OF DENTAL ANATOMY. 



It occasionally happens that the pulp resumes its formative 

 activity, and new dentine is developed which, with the 

 exception of a slight break or bend in the continuity of the 

 tubes, is almost exactly like normal dentine. More often, 



FIG. 50 ('). 



however, the boundary line between the old and the new is 

 marked by an abundance of irregular spaces and globular 

 contours, whilst further in the mass of new secondary dentine, 

 the tubular structure again asserts itself more strongly : this, 

 is well seen in the specimen figured. 



(*) Secondary dentine filling up one of the comua of the pulp cavity. 

 From a human molar affected by caries. 



