Abstract
Summary
The eruption rate of maxillary incisors was determined in normal, thyroidectomized, adrenalectomized and thyroadrenalectomized, adult, female rats, with or without daily administration of cortisone. Thyroidectomy resulted in an average reduction in rate of 19% during the first 8 weeks. When adrenalectomy was superimposed on thyroidectomy 8 weeks post-operatively, average rate decreased to 53% below normals, increased the rates in all 4 groups to levels above that of normal controls. The results suggest that the normal controls. The results suggest that the normal controls. The results suggest that the normal rate of eruption of the incisor may be influenced by a synergistic action of the thyroid and adrenal hormones.
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