. 2018 Oct 3;89(1):3–9. doi: 10.2319/010418-4.1

Table 2.

Reasons for Exclusion^a

Reasons	Fixed Appliance Group, n	Clear Aligner Group, n	Total, n
No final cephalometric radiographs	8	21	29
Orthognathic surgery	10	2	12
Phase 1 and 2 treatment	2	0	2
Use of TAD	NA	2	2
Total	20	25	45

TAD indicates temporary anchorage device; NA, not applicable; TAD was considered one of the various auxiliary appliances used in fixed appliance therapy.