Table 1 Measurement Variables of Teeth Used
Measurement Variables | Definition |
|---|---|
CE (T1—T2) (a) | anterior teeth retraction amount at crown edge in the vertical direction |
RA (T1—T2) (b) | anterior teeth retraction amount at root apex in the horizontal direction |
La (T1—T2) | Loss of root on labial surface |
P (T1—T2) | Loss of root on palatal surface |
M (T1—T2) | Loss of root on mesial surface |
D (T1—T2) | Loss of root on distal surface |
RA (T1—T2) | Loss of root at root apex |