A radiographic study of roots in extraction sites

1) Roots that are overparalleled to the extent that the apices touch do not relapse to the desired upright positions. 2) Roots that are overparalleled, but the apices do not touch, tend to upright but, in so doing, leave space between the crowns. 3) Roots that are underparalleled at the completion of active treatment tend to maintain their positions or diverge even farther. 4) The best postretention results were cases in which roots and crowns were positioned in normal, upright parallel positions. Slight spaced remaining in these situations appeared to close evenly.