  This document outlines a PROSPERO pre-registered protocol for a systematic
review regarding articulatory changes in speech following oral or orophayrngeal
cancer treatment. Treatment of tumours in the oral cavity may result in
physiological changes that could lead to articulatory difficulties. The tongue
becomes less mobile due to scar tissue and/or potential (postoperative)
radiation therapy. Moreover, tissue loss may create a bypass for airflow or
limit constriction possibilities. In order to gain a better understanding of
the nature of the speech problems, information regarding the movement of the
articulators is needed since perceptual or acoustic information provide only
indirect evidence of articulatory changes. Therefore, this systematic review
will review studies that directly measured the articulatory movements of the
tongue, jaw, and lips following treatment for oral or oropharyngeal cancer.
