Long-term space changes after premature loss of a primary maxillary first molar.

The arch width, arch length, intercanine width, and intercanine length significantly increased at 81 months (P < 0.05), whereas the arch perimeter increases approached significance (P = 0.071).

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Although the difference in the arch perimeter did not reach statistical significance, a significant increase might have been found if more samples had been examined.

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