Overcorrection with aligners, when and how? 7 MINUTE SUMMARY

“We do not accept the weaknesses of out appliances as absolutes, but rather we adjust out treatment mechanics to account for them Mazyar Moshiri, “If you are not willing you use elastics – you are not able to get finishing like braces” Mazyar Moshiri “We cannot have a reasonable discussion of efficacy and accuracy until we study the appliance as orthodontic clinicians, and not as scientists Mazyar Moshiri Join me for the first summary of 2025, exploring finishing with clear aligners. Mazyar Moshiri explores overcorrection with aligners, when they should be used and his protocol. It was a lecture from last year’s AAO winter meeting.. This episode consists of overcorrection methods of 4 malocclusions: deep bite, anterior openbite, class 3, and expansion. Maz also shares his pearls on what to watch out for when using clear aligners with overcorrection. EXTRAS: Mazyar Moshiri has kindly given permission for the summary slide of his overcorrection protocol to be included in the podcast notes, please see the podcast website https://orthoinsummary.com/ Overcorrection Deep bite - achieve AOB Over-intrusion lower incisors to achieve a 50-100% of total movement predicted Favourable if proclaining teeth, unfavourable if retroclining Use of attachments on premolars, note the hierarchy of attachment design places anchorage for anterior intrusion 5th, “Drs have to doctor the Clincheck”. Anterior openbite Posterior intrusion – overcorrect with occlusal bite blocks class 3 triangular elastics canine and premolars Force down on posterior bite blocks May require controlled relapse following overcorrection, done in refinement NOTE – aligners continuous force system, reciprocal extrusion of anterior teeth is expected Class 3 case Retract lower incisors with retromolar tads and 6 Oz 3’16th Side effect – increase in curve of spee – similar to retraction on a NiTi wire, aligner is not stiff enough to resist Correction in refinement with anterior intrusion to eliminate premature contacts, DO NOT EXTRUDE POSTERIOR TEETH, as aetilogy is anterior iatrogenic extrusion Expansion Overcorrection of 1-2 mm, greater the further posterior Attachments, plan buccal attachments +/- palatal attachments, to account for likely buccal tipping, ensuring buccal root torque and preventing palatal cusp dropping Tip: for palatal cusp dropping place occlusal attachment on the palatal cusp to prevent extrusion during expansion Caution – if already in buccal version, consider limited correction