Journal of the Korean Academy of Pediatric Dentistry 2013;40(4):314-320.
Published online November 30, 2013.
Management of Eruption Disturbances of the Mandibular First Molar : A Case Report
Hyunsoon Jeon Jeon, Yeonmi Yang, Byeongju Baik, Jaegon Kim
Department of Pediatric Dentistry and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University 
Correspondence:  Jaegon Kim,  Tel: +82-63-250-2128, Fax: +82-63-250-2131, Email:
Received: 31 July 2013   • Accepted: 1 October 2013
With a prevalence rate of 0.01%, the presence of eruption disturbances of mandibular first molar has rarely been in populations. Eruption disturbances of permanent molars have been usually manifested as impaction, primary retention, and secondary retention. The treatments of eruption disturbances are carried out by: periodic observation; surgical exposure; forced eruption after surgical exposure; forced eruption with luxation; surgical repositioning; and extraction. This case report show successfully erupted mandibular first molars by various treatment methods on five patients diagnosed with impaction, primary retention, and secondary retention, respectively. Eruption disturbances of the mandibular first molar can be properly diagnosed with impaction, primary retention, and secondary retention by clinical and radiographic examination at normal eruption time of the mandibular first molar. The treatment should be done synthetically, considering eruption state of affected tooth, the relationship between the affected tooth and the adjacent or opposite tooth, the patient's age, treatment compliance, and economic state.
Key Words: Mandibular first molar, Retention, Impaction, Eruption

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