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KMID : 0358920000270030438
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Journal of the Korean Academy of Pedodontics
2000 Volume.27 No. 3 p.438 ~ p.443
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Ectopic eruption of transposed mandibular permanent lateral incisor
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Lim Hyun-Hwa
Kim Yong-Soo
Jang Ki-Taeg
Kim Chong-Chul
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Abstract
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Ectopic eruption should be understood as a change in the course of the normal eruption path of a dental bud at any moment its origin. An example of this alteration is the dental transposition, a rare and more specific dental anomaly that may be defined as a change of position between two teeth.
This case shows ectopic eruption of transposed mandibular lateral incisor beneath primary first molar at the first transitional period of the mixed dentition. The crown of the lateral incisor has tipped distally, compelling root resorption and exfo1iation of the adjacent primary cuspid and primary first molar.
The reason for such eruption is not elearIy understood, but it may involve ; (1)trauma history. (2)prolonged retention of the deciduous teeth. (3) premature exfoliation of the deciduous teeth. and (4)genetic factor.
Treatment is divided into interceptive and definitive treatment.
Ectopically erupting mandibular incisor tends to become transposed with the adjacent cuspid and thus seems to warrant early orthodontic intervention Early treatment may obviate later extraction of transposition of the incisor and canine in the permanent dentition. Timing is an important factor to be considered regarding in the correction of the lateral incisor transposition.
This case advocates treatment with an active orthodontic therany at the early stage of the mixed dentition. before the eruption of the permanent cuspid.
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KEYWORD
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Ectopic eruption, Trasposition, Orthodontic intervention
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