Abstract
Ectopic eruption of permanent first molars occurs infrequently and causes some resorption of the adjacent primary second molar. Early treatment of ectopically erupting permanent first molars was considered in order to prevent space loss. The purpose of these two case reports is to describe and document correction of moderately impacted both permanent maxillary right first molars and both maxillary and mandibular left first molars in the mixed dentition. Using both a Halterman and a modified appliance as correcting appliances, the ectopically erupting permanent first molars were successfully uprighted and repositioned. The Halterman appliance is a band and loop appliance with a bonded button on the permanent molar and an elastic chain for disimpaction. The modified appliance was a combination of a Halterman and Nance holding arch or lingual arch. The results of these cases were as follows :1.By using the Halterman and the modified appliance, ectopic eruption of permanent first molars was improved in a short period of 2 to 3 months, and patients accepted the appliance without showing pain or discomfort.2.It was shown that the modified appliance can be applied to the mandibular first molar.Finally, it was suggested that the Halterman and the modified appliance are sufficiently effective treatment for ectopic eruption of permanent first molars.
