Short-term (12 weeks)

1~2 tooth spaces with a total of 4mm or less, no occlusal interference during space closing

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Spacing

There are functional or aesthetic problems due to many or large spaces between teeth. Causes include loss of permanent teeth, congenital tooth loss, impaction of teeth, and residual primary teeth, etc.

Mid-term (24 weeks)

3~4 tooth spaces with a total of 4mm or less, no occlusal interference during space closing

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Long-term (48 weeks)

4~5 tooth spaces in total 4~6mm, minor occlusal interference during space closing

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Not applicable

At least 5 tooth spaces with a total of 6mm or more, severe occlusal interference during space closing

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