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EFFICACY OF TEMPORARY FIXED RETENTION FOLLOWING ...

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4<br />

Incisor Irregularity (mm)<br />

3<br />

2<br />

1<br />

0<br />

Fixed<br />

Retention<br />

Remove<br />

Figure 4-7. Box plot of the distribution in mandibular Incisor Irregularity at the<br />

end of treatment according to the type of retention.<br />

Both samples are positively skewed, since “negative” Incisor Irregularity has no<br />

definition. Note that cases with greater irregularity (e.g., > 1 mm) are more<br />

common in the fixed sample.<br />

87

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