Residents' journal review

The authors of this retrospective study evaluated the predictability of arch expansion using Invisalign. The sample included 64 white adult patients with an average age of 31.2 years, who had both arches treated by 1 practitioner using Invisalign only. The patients had no missing teeth, and their treatment entailed no interproximal reduction posterior to the distal of the canines. Twenty patients had a dentoalveolar crossbite involving at least 1 tooth, mainly premolars. The mean treatment duration was 56 weeks, and only 1 round of aligners was used; no refinement was included.

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