Share Page:

Volume 15 , Issue 3
May/June 2002

Pages 254–258

Spectral Analysis of /s/ Sound with Changing Angulation of the Maxillary Central Incisors

Christoph Runte, Dr Med Dent, Djafar Tawana, Dieter Dirksen, Dr Rer Nat, Bettina Runte, Dr Med Dent, Antoinette Lamprecht-Dinnesen, Prof Dr Med, Friedhelm Bollmann, Prof Dr Med, Dr Med Dent, Eberhard Seifert, PD Dr Med, Gholamreza Danesh, Dr Med Dent

PMID: 12066488

Purpose: The aim of the study was to measure the influence of the maxillary central incisors free from adaptation phenomena using spectral analysis. Materials and Methods: The maxillary dentures of 18 subjects were duplicated. The central incisors were fixed in a pivoting appliance so that their position could be changed from labial to palatal direction. A mechanical push/pull cable enabled the incisor section to be handled extraorally. Connected to the control was a sound generator producing a sinus wave whose frequency was related to the central incisor angulation. This acoustic signal was recorded on one channel of a digital tape recorder. After calibration of the unit, the denture duplicate was inserted into the subject’s mouth, and the signal of the /s/ sounds subsequently produced by the subject was recorded on the second channel during alteration of the inclination angle simultaneously with the generator signal. Spectral analysis was performed using a Kay Speech-Lab 4300B. Results: Labial displacement in particular produced significant changes in spectral characteristics, with the lower boundary frequency of the /s/ sound being raised and the upper boundary frequency being reduced. Conclusion: Maxillary incisor position influences /s/ sound production. Displacement of the maxillary incisors must be considered a cause of immediate changes in /s/ sound distortion. Therefore, denture teeth should be placed in the original tooth position as accurately as possible. Our results also indicate that neuromuscular reactions are more important for initial speech sound distortions than are aerodynamic changes in the anterior speech sound–producing areas. Int J Prosthodont 2002;15:254–258.

Full Text PDF File | Order Article


Get Adobe Reader
Adobe Acrobat Reader is required to view PDF files. This is a free program available from the Adobe web site.
Follow the download directions on the Adobe web site to get your copy of Adobe Acrobat Reader.


© 2017 Quintessence Publishing Co, Inc

IJP Home
Current Issue
Ahead of Print
Author Guidelines
Accepted Manuscripts
Submission Form
Quintessence Home
Terms of Use
Privacy Policy
About Us
Contact Us