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Show Birth-Ring Found in Human Teeth by Chicago Dentist Chicago. Discovery of a birth-ring in human teeth, something like the growth-ring growth-ring of a tree, was announced by Dr. Isaac Schour of the University of Illinois College of Dentistry here. Tho birth-ring is said to be a "definite biological landmark in the history of the individual." Its discovery, dis-covery, Dr. Schour believes, opens the way for other new discoveries in the history of the teeth and the individual. The birth-ring, or neo-natal ring, to give it its scientific name, is found in the first or baby teeth. It appears in both the dentin and enamel en-amel and makes it possible to compare com-pare the amount and quality of each of these substances in the teeth before be-fore and after birth. Marked by Biologic Changes. The teeth start to grow about four months before the baby is born and the last tooth has not completed com-pleted its growth until the age of twenty years is reached. During this time several important biologic changes take place, the most important im-portant of which is birth. One effect of this experience, in which the change from dependent to independent independ-ent life is made, is a loss of weight which it takes the baby 10 days or more to regain. It is not surprising. Dr. Schour points out, that this tremendous tre-mendous experience should also leave its mark on the teeth. Other markings have been found on the teeth but their significance has not been understood. Dr. Schour believes that these may mark other biologic changes and is conducting further investigations along these lines. |