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Journal of Bioactive and Compatible Polymers
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Rheological Characterization of Vocal Folds after Injection Augmentation in a Preliminary Animal Study

A. Borzacchiello

Institute of Composite and Biomedical Materials, CNR and CRIB, University of Naples, Federico II, Piazzale Tecchio 80, 80125 Napoli, bassunta{at}unina.it

L. Mayol

Institute of Composite and Biomedical Materials, CNR and CRIB, University of Naples, Federico II, Piazzale Tecchio 80, 80125 Napoli

L. Ambrosio

Institute of Composite and Biomedical Materials, CNR and CRIB, University of Naples, Federico II, Piazzale Tecchio 80, 80125 Napoli

O. Gärskog

Department of Otorhinolaryngology, University Hospital, University of Umea, Sweden

Å. Dahlqvist

Department of Otorhinolaryngology, University Hospital, University of Umea, Sweden

The investigation of vocal folds viscoelastic properties in an animal model (rabbit) after injection of various augmentation substances, 6 months after injection, is reported. The injected materials were: hyaluronan-based materials (Hylan B gel and Deflux®), cross-linked collagen (Zyplast®) and polytetrafluoroethylene (Teflon®). Rheological properties of the augmentation substances were also evaluated. The results from these animal experiments indicate that the viscoelastic properties of the vocal folds injected with Deflux®, Zyplast® and Hylan B gel are similar to the healthy vocal folds (non-injected samples) used as control, thus demonstrating that these materials are good candidates for further studies aimed at restoring/preserving the vibratory capacity of the vocal folds with injection treatment in glottal insufficiency.

Key Words: viscoelasticity • vocal folds • injection • augmentation • hyaluronan

Journal of Bioactive and Compatible Polymers, Vol. 19, No. 4, 331-341 (2004)
DOI: 10.1177/0883911504045229
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