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Prediction of growth rotation of the lower jaw and the modification of overbite.

Summary Records of 870 orthodontic patients were used to assess growth prognosis as measured by Bjork's Sum of Angles and Jarabak's Facial Height Ratio. The predicted direction of growth in 447 cases was compared with that actually observed and no correlation was found between actual direction of growth and the size of the cephalometric measurements SA and FHR.