A Case Of Correction Of 16&26 With Abnormal Eruption

In this case, a modified Nance arch was used to correct the ectopic eruption of the maxillary first permanent molars restoring the premolars eruption space. The patient was a 7-year-old male who visited the clinic due to ectopic eruption of the upper posterior teeth. Clinical and X-ray examinations revealed that 16 and 26 were ectopically erupted mesially, and 55 and 65 had distal root resorption without mobility. The diagnosis was ectopic eruption of 16 and 26. Treatment: Design 54 and 64 type hooks with rings and bilateral distal hooks, and attach lingual clasps on the occlusal surfaces of 16 and 26, applying force with elastic coils. One month later, 16 and 26 erupted upright, and a conventional Nance arch retainer was replaced. At the 3-month follow-up, no significant changes in the space were observed. To ensure the continuous and effective application of orthodontic force, it is recommended to shorten the follow-up time, especially when the tooth root development is not complete. After orthodontic treatment, the eruption space of the second premolars should be maintained in time. Ectopic eruption of the first permanent molars often leads to premature loss of the second deciduous molars and insufficient eruption space for premolars. Intervention for ectopic eruption of the first permanent molars can reduce the occurrence of malocclusion to a certain extent.