Reviewing a collection of 120 facial CT scans taken for other, unrelated medical reasons, plastic surgeons measured changes that occurred to facial bones over time. The CT scans were divided equally by gender and age, 20 men and 20 women in each of three age groups: young (ages 20-36), middle (41 to 64), and old (65 and older). Researchers used a computer program to measure the length, width, and angle of the mandible, or jaw bone, for each scan, and compare the results for each group. Using CT scans for this study allowed for more accurate three-dimensional reconstruction and increased accuracy of measurements, disputing previous research that relied on traditional head x-rays and suggested that the jaw bone expands with age.
So facial rejuvenation will require guiding bone development to gradually restore youfhful proportions and thicknesses.
The angle changes and jaw bone volume decreases.
The angle of the jaw increases markedly with age, which results in a loss of definition of the lower border of the face, according to the study. Jaw length decreases significantly in comparisons between the young and middle age groups, whereas the decline in jaw height from the middle to old group was noteworthy.
“The jaw is the foundation of the lower face, and changes to it affect facial aesthetics,” said Howard N. Langstein, M.D., professor and chief of Plastic and Reconstructive Surgery at the University of Rochester Medical Center. “These measurements indicate a significant decline in the jaw’s volume as a person ages, and therefore less support of soft tissue of the lower face and neck.”
To do bone rejuvenation we'll need youthful stem cells to make new osteoclasts and osteoblasts for resculpting the bones. We'll also need techniques for guiding the cells to reshape bones in desired ways. My guess is a lot of people will opt for new faces that make them even more attractive than they were when young the first time.
|Share |||Randall Parker, 2010 March 23 11:31 PM Aging Appearances|