Journal of the Korean Academy of Pediatric Dentistry 2010;37(1):130-135.
Published online February 28, 2010.
ECTOPIC ERUPTION OF MANDIBULAR FIRST PERMANENT MOLAR : A CASE REPORT
Jeong-Won So, Kwang-Hee Lee, Ji-Young Ra, So-Youn An, Yun-Hee Kim, Jae-Hyuk Ban
Department of Pediatric Dentistry, College of Dentistry, Wonkwang University 
Correspondence:  Kwang-Hee Lee,  Tel: 063-859-2957, Email: kwhlee@wonkwang.ac.kr
Received: 15 September 2009   • Accepted: 18 November 2009
Abstract
Ectopic eruption is caused by an abnormal direction of eruptive path, most common in maxillary first molar, mandibular lateral incisor, and maxillary canine, and sometimes mandibular first molar. Ectopic eruption of first molar leads to abnormal root resorption of second deciduous molar, which, if left untreated, could cause premature loss of second deciduous molar; mesial tilting and rotation of first permanent molar; lack of space for eruption of second premolar; and occlusal problems. Therefore early treatment is advised when diagnosed as ectopic eruption. Treatment of ectopic eruption in the first permanent molar involves providing proper guidance for the direction of eruption using interproximal wedging and distal tipping methods while preserving second deciduous molar. This case report shows satisfactory results of the ectopic eruption of mandibular first molars in young patients who were treated with Humphrey appliance and Halterman appliance.
Key Words: Mandibular first permanent molar, Ectopic eruption, Distal tipping, Humphrey appliance, Halterman appliance


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