Back to matchesWe found a matchYour institution may have rights to this item. Sign in to continue.TitleTorque expression by active and passive self-ligating brackets in patients with four premolar extractions: A retrospective study.AuthorsRen, Xinyi; Li, Jiao; Zhao, Yunhe; Li, Houxuan; Lei, LangPublicationOrthodontics & Craniofacial Research, 2020, Vol 23, Issue 4, p509ISSN1601-6335Publication typejournal articleDOI10.1111/ocr.12403