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Updated: Jul 11, 2026

Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions
Published on: November 25, 2017
[Study of congenital velopharyngeal insufficiency and hypernasality]
1Cranilfacial Center, School of Stomatology, Shanghai Second Medical University, Shanghai 200011, China.
Objective:
To evaluate 27 congenital veloparyngeal insufficiency(CVPI) subjects and 6 normal articulation subjects with airflow pressure techniques.
Methods:
A compare analysis was performed in two groups (CVPI subjects and normal articulation subjects) during speech production of /hemper/ and /papa/.
Results:
There wasn't statistical significance between two groups in oral air pressure and velopharyngeal orifice areas, however, CVPI group differed significant in nasal airflow on the articulation of /hemper/ and /papa/.
Conclusions:
When the degree of CVPI subject's VP opening was small, hypernasality appeared to be related to duration of the opening-closing movements.
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