498 



Special Vertebrate Organogenesis 



and of attrition is readily measured by notch- 

 ing the exposed enamel surface at the gin- 

 gival margin. The decrease in distance be- 

 tween the notch and the incisal edge is a 

 measure of the rate of attrition. The increase 

 in distance between the notch and the gin- 

 gival margin is a measure of the rate of 

 eruption. 



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