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KMID : 0358920090360040556
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Journal of the Korean Academy of Pedodontics
2009 Volume.36 No. 4 p.556 ~ p.562
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RADIOGRAPHIC STUDY OF ERUPTION CHARACTERISTICS FOR UPPER PERMANENT 1ST MOLAR CLASSIFIED AS IRREVERSIBLE ECTOPIC ERUPTION
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Im El
Lee Sang-Ho
Lee Nan-Young
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Abstract
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ctopic eruption of the maxillary first permanent molar means that the molar erupts out of the normal position and is arrested in its eruption by the second primary molar. This local eruption disturbance results in a premature atypical resorption on the distal part of the second primary molar. In most irreversible cases, the second primary molar is lost prematurely, either by spontaneous exfoliation or by extraction. In cases of doubt as to whether the eruption is of the irreversible type or not, careful radiographic observation period for a few months would be valuable in evaluating the possibilities of the tooth’s freeing itself. The purpose of this study was to determine the characteristics and occurrence of the ectopic eruption of the maxillary first permanent molar. A descriptive, observational, retrospective study was done using the radiographs of 25 conseutive patients, who were in the first phase of mixed dentition. A method was designed to evaluate the amount of pathologic resorption of the second maxillary primary molar and the mesial angulation of the first permanent molar. The study showed that the most important etiologic factor was the eruption path or mesial angulation of the first permanent molars relative the chosen reference lines.
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KEYWORD
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Ectopic eruption, The maxillary first permanent molar, Mesial angulation, The maxillary second primary molar, Root resorption
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