Summary of Chris Chan’s lecture at the AAO, looking at TADs and their use.
Summary
Aligners are a push appliance
TADs usage
o For distalisation
o Maxilla: infrazygomatic region (6-7 buccally)
o Mandible: buccal shelf region (vertically lateral to 6-7 region)
o Anterior intrusion
o Labially placed U1-U2 region
o Elastic from palatal aspect over the incisal edge to labial TADs
Extraction cases: Aligners lose anchorage and extrude upper incisors
Aligners tip teeth, to achieve bodily movement require counter vector
When in doubt mini screw
References
Alignment
· Grünheid, T., Loh, C. and Larson, B.E., 2017. How accurate is Invisalign in nonextraction cases? Are predicted tooth positions achieved?. The Angle Orthodontist, 87(6), pp.809-815.
Expansion
· Zhou, N. and Guo, J., 2020. Efficiency of upper arch expansion with the Invisalign system. The Angle Orthodontist, 90(1), pp.23-30.
Extraction cases
o Dai, F.F., Xu, T.M. and Shu, G., 2019. Comparison of achieved and predicted tooth movement of maxillary first molars and central incisors: First premolar extraction treatment with Invisalign. The Angle Orthodontist, 89(5), pp.679-687.
Cases from Journal of Digital Orthodontics (freely available)
o http://iaoi.pro/asset/files/jdo_vol_55.pdf
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