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The infra-occluded primary molars were extracted at age 10 before infra-occlusion became too extensive, and a lingual arch space maintainer was placed.
The conclusions are that nothing is stable, but preserving the E space with a lingual arch is best in mixed dentition treatment.
Several treatment procedures have been proposed to treat scissors-bite in the molars: intermaxillary cross-elastic, (1) multi-bracket appliance, transpalatal arch appliance (TPA) with intra-maxillary elastic, (2-3) and lingual arch appliance with intra-maxillary elastic.