A comparative analysis of intrusion of incisor teeth achieved in adults and children according to facial type.

A comparison was made of incisor intrusion achieved in adults and children with deep bite. Facial type was also examined for effect upon intrusion achieved. Fifty-five cases treated with bioprogressive mechanics were studied cephalometrically; subjects included twenty-four adults and thirty-one children. Neither age nor facial type was found to be statistically related to the amount of incisor intrusion achieved in this sample. A method of measuring intrusion at the root apices was devised and was thought to give a more accurate indication of actual bodily intrusion. More external root changes during treatment were observed for adults than for growing children. There was a wide latitude in the amount of intrusion observed in both groups and in all three facial types. Considerable overbite reduction was noted for the sample, and intrusion was found to be but one factor in this.