CHANGES OF MOLAR ATTRITION IN RELATION TO AGE IN CHINESE IN LIAONING PROVINCE / 解剖学报

ABSTRACT

The relation between molar attrition and age was studied in 208 skulls Chinese male of cadavers from the Liaoning province. The ages of these cadavers range from 15 to 61 years. The total number of teeth studied are 658 first molars and 601 second molars. The degree of attrition was divided into six grades. Results may be summarized as follows1. The degree of molar attrition increases with age.2. The second molar is less attrited thanthe first one in the same jaw be'cause it crupts later, and the age ratio (in years) between M_1 and M_2 is about 67.3. The degree of molar attrition on both sides and both jaws is symmetrical in 63?1.9％, but no general rule can be found.4. A regressive equation of molar attrition has been obtained.