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Definitions of teeth measurements used
| Measurement variables | Definition |
| Drift distance of upper incisor crown edge | Upper central incisor retraction amount at edge in sagittal plane |
| Drift distance of upper incisor root apex | Upper central incisor retraction amount at root apex in sagittal plane |
| Upper incisor intrusion measurement | Perpendicular distance difference between incisor edge of maxillary central incisor and the palatal plane |
