Clinical Update quiz
The Clinical Update online is a free member service providing up to 11 FREE CPD hours per year.
Each month, the Clinical Update is published online. There are 11 Clinical Updates per year (February - December). This service is available to ADAVB and ADATas members only. Members can log in to view and answer the Clinical Update questions. If you answer at least eight out of 10 questions correctly, you will receive one hour of scientific CPD.
Please note: Each new Clinical Update will be available below from the first business day of each month.
August Clinical Update
Estimation of centers of rotation of the maxillary incisors during nonextraction space closure using the Invisalign appliance.
Desai DN, Weir T, Meade MJ. Am J Orthod Dentofacial Orthop 2025; 168-88-98. https://doi.org/10.1016/j.ajodo.2025.02.012
Compiled by Dr Sarah Chin
This article was originally published by the American Journal of Orthodontics and Dentofacial Orthopedics and has been edited for brevity and clarity.
Introduction
Invisalign clear aligner therapy (CAT) was introduced in 1998 to treat mild- moderate malocclusion and advances in aligner technology have enabled management of more complex malocclusions. In comparison with fixed appliances, CAT is more aesthetic, comfortable and enables good access for oral hygiene. Treatment planning is performed using software called ClinCheck. This enables construction of a digital treatment plan with incremental modifications to a series of aligners to achieve the desired treatment end point. A series of aligners are manufactured once the clinician has approved the treatment plan.
With the increased use of CAT, more research is available in regards to the efficacy and accuracy of the planned treatment. Planned movements such as torque (TrQ) and translation (TrN) are less accurate in comparison with tipping movements of maxillary incisors. Previous studies have compared the planned and achieved movements of maxillary first molars and central incisors after first premolar extractions using the initial series of Invisalign aligners. The central incisor was retroclined more than planned by 5.1o and the first molar had a mesial tip of 2.9o. The accuracy of achieving the planned space closure during extraction and non-extraction space closure (NESC) in maxillary and mandibular arches with the Invisalign appliance was 70% but the discrepancy between the planned and achieved orthodontic tooth movement (OTM) was not reported.
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