A Case of Eruption Guidance of a Partially Impacted Ankylosed Lower Permanent First Molar

Abstract

I report a clinical case of eruption guidance of a partially impacted ankylosed lower left permanent first molar.At the age of 9 years and 6 months the patient had received fenestration because of an unerupted lower left permanent first molar. At the age of 10 years and 1 month, tooth germ of the lower left permanent third molar had been extracted and surgical luxation had been performed on the lower left permanent first molar. Records indicated that the lower left permanent first molar was not ankylosed at that time. However, there was no tendency to erupt.At the age of 11 yaers and 3 months I applied traction. Because there was no tendency to erupt I judged the lower left permanent first molar to be ankylosed, probably due to the surgical luxation at 10 years and 1 month. I applied traction after surgical luxation, but the lower left permanent first molar recured ankylosed. The first time, surgical luxation and traction were spaced 18 days apart. The second time, surgical luxation and traction were spaced 7 days apart. The eruption process was successfully completed under careful observation.We should treat delayed eruption of permanent first molars as soon as possible, choosing the proper treatment plan.