[Dental findings in a case of idiopathic hypoparathyroidism]

Idiopathic hypoparathyroidism is characterized by a deficiency of the parathyroid hormone, origin unknown, and causes a low serum calcium and a high serum inorganic phosphorus. This report concerns a clinical observation of a case of idiopathic hypoparathyroidism. This case was examined from the dental point of view. The findings were as follows: 1. The roentgenographic findings revealed that there was no demonstrable abnormality concerning bone age indicated between the ages of 5 and 6 years. 2. Severe dental caries were noted in the deciduous teeth and the permanent teeth. 3. Hypoplasia and hypocalcemia were recognized in most of the permanent teeth. 4. Large pulp chambers were observed in the deciduous teeth and the permanent teeth, and thickening of the lamina dura was observed in the permanent teeth. 5. The histological findings of the extracted deciduous teeth and the upper right first molar were such that: (1) there was hypoplasia and hypocalcemia in the dentin of deciduous teeth, and there were multiple resorptions in the cementum. (2) there was hypoplasia in the enamel of the upper right first molar. 6. Electron probe microanalysis of the upper left second molar revealed that the degree of mineralization and concentration of Ca, P and Mg in the dentin of the root showed a lower intensity than in the dentin of the normal one. 7. It was assumed from the dental point of view that this hypoparathyroid condition first appeared at about 11'months approximately 18'months of age.