Orthodontic intervention in the early mixed dentition: A prospective, controlled study on the effects of the eruption guidance appliance
This study was started to investigate the effects of orthodontic treatment in the early mixed dentition with the eruption guidance appliance. Treatment in the early mixed dentition with the eruption guidance appliance is an effective method to restore normal occlusion and eliminate the need for further orthodontic treatment.
The treatment group was derived from the entire 1992 and 1993 age cohorts in Jalasjärvi (population, 9000) and the 1992 age cohort in Kurikka (population, 11,000). All children were screened in the late deciduous dentition, and a full clinical examination was made at the onset of the mixed dentition period of those who were considered to potentially need treatment.
The study started with a total of 315 children. Of them, 33 were treated with other appliances, mainly the quad-helix, and they were excluded from the study sample. In 27 cases, the child or the family refused orthodontic treatment. Treatment with an erup- tion guidance appliance was started in 255 children. During the treatment, 12 children moved to another municipality and could not complete the treatment; their records were excluded from the analysis. Of the remaining 243 children, 167 completed the treatment successfully.
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