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Abstract

The rami of eight human mandibles ranging in age from six months prenatal to adulthood were studied radiographically and by matte acetate tracings. The characteristic trabecular pattern seen in the adult ramus was not found until the fifth year of life. A disorganization of the pattern occurred at nine years of age, but was re-established by the twelfth year. The changes in pattern observed appear to be related to the eruption times of the teeth, which probably modify the muscular stresses exerted on the bone in the process of mastication.