INFLUENCE OF LOSS OF PERMANENT FIRST MOLAR ON POSITION OF ERUPTION OF SECOND PREMOLAR

¹ New York, N. Y.

When the space left by the extraction of maxillary first molar teeth was entirely eliminated, there was no relationship between the amount of distal shifting of the premolar teeth and the age of the child when the first molar extraction occurred. There was no increase in space shown between the first and second premolars in the maxilla.

In the mandible, the amount of distal shifting of the second premolar teeth and the amount of space between the premolars shows a direct correlation to the age of the child when the first molar was extracted, in spite of the fact that the space left by the extraction of the first molars was closed in all cases. The younger the child the greater the amount of space found between the first and second premolar teeth.