The unpredictability of primary molar resorption following ectopic eruption of permanent molars.

Two case reports are given, demonstrating what appears to be two types of resorption associated with ectopic eruption. In both cases a progressive resorptive process occurred on one side and a stationary type on the other. Close follow-up is important; it resulted in a successful outcome for the patient in case 2 here, whereas the first patient required major orthodontic treatment because of the ectopic eruption.