抄録
908 Japanese dry skulls (3-84y) were investigated its masticatory parts about sex dimorphism. They were not cured their caries and defect of teeth.
Results
Male condylar breadth and M. masseter origin length were wider than these of female in over 20 years old groups, and were caused by their functional discrimination. Edentulous group reduced their breadth and length, especially in condylar breadth. Old edentulous group indicated morphological non-sexual dimorphism. Male number of loss of teeth were same as female. Attrition showed functional discrimination between male and female, but we could not clearly that of causes. Bite relation of anterior teeth were pointed out their sex differences, and results of attrition were under consideration, we thought that the teeth application or use differed between male and female. It was caused by functional decline and effect of sex hormones that old female edentulous showed reduction of condylar breadth and M. masseter origin length.
