Abstract
A study was undertaken to measure the effect of aging on the skeletal profile, the soft-tissue profile, and their relationship (soft-tissue thickness), also measuring the effect of facial type, mandibular growth, and increase in fat on the dependent variable. Fifty-one longitudinal series were used for this purpose, and the data were treated statistically as well as graphically. Aging had an effect on all measurements except soft-tissue profile; there was also a sex effect shown by the straighter profile in females. Facial type, direction of mandibular growth, and increase in fat were unsuccessfully manipulated. An attempt to measure the predictability of the changes occurring in the skeletal or soft-tissue profile was also made. The two profiles appeared to be equally predictable on a long age span. This study supplements Subtelny's findings with a different treatment of the data, an estimation of variability, and a measurement of the effect of different variates.
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