[Importance of dental malposition and migration in periodontics].
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Supraeruption of the maxillary first molar in the absence of the mandibular first molar was observed in subjects with both normal and pathologic periodontics. Both the migration of the gingival margin and the increase in the crown height were evaluated in terms of the length of time the antagonist tooth had been missing. Values obtained were compared with those of a reference group with complete normal dentitions. The results show that in the first years following the loss of the opposing tooth, supraeruption is mainly due to growth of the periodontium. Later or in the case of periodontal pathosis, tooth movement beyond the occlusal plane is due principally to active eruption.
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These three cases are examples of ectopia related to tumor formations which they may have precipitated or of which they are the consequence. Here it is not a question of explaining the phenomenon, but only of showing some cases of migration or of relatively exceptional ectopia with the specific pathways of approach.
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