Crowding treatment with aligners: Strategies and predictability-a systematic review

Transparent aligners offer a viable alternative to fixed appliances for correcting malocclusions, providing advantages in tooth movement, anchorage control, and specific applications such as crossbite correction and dental arch expansion. Our research aims to evaluate the resolution of crowding in aligner therapy, considering efficacy, predictability, and influencing factors by comparing it with multibracket therapies. The Boolean keywords: “Crowding” AND “Aligners” were used in PubMed, Scopus, and Web of Science databases with a constraint on English-language papers from 1 January 2013 through 1 August 2023. After removing duplicates examining and verifying the eligibility of the 345 articles that the automated search produced, 16 papers were included. Clear aligners (CAs) are efficient, particularly in cases requiring precise vertical control or correcting single-tooth crossbites by acting as support surfaces; however, challenges such as accurate tracking and managing expansion levels must be considered during treatment planning.