Oral diadochokinesis and associated oro-facial function in young and old German mother-tongue speakers: A cross-sectional study.

Objectives: The aims of this study were to compare oral diadochokinesis and to test associations with oro-facial functional parameters in healthy young and old German speakers.

Background: Oral diadochokinesis is a key component in the concept of oro-facial hypofunction and relates to tongue and lip motor function but may depend on the linguistic background.

Materials And Methods: Healthy German speakers with a minimum of 20 teeth were recruited to form a young (<60 years) and an older group (≥60 years).