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DENTOFACIAL DISHARMONY PATIENTS' SIBILANTS DIFFER FROM CONTROLS' MORE IN SOURCE THAN FILTER PROPERTIES
Madeleine Oakley1, Auvi Tran2, Ciana Paye1
1North Carolina State University.
Proceedings of the ... International Congress of Phonetic Sciences. International Congress of Phonetic Sciences
|January 22, 2024
Summary
Dentofacial disharmonies (DFD) affect consonant production, particularly sibilants. This study reveals DFD patients have less prominent mid-frequency spectral peaks, indicating altered noise source rather than front cavity size.
Area of Science:
- Speech Science
- Orthodontics
- Acoustic Phonetics
Background:
- Dentofacial disharmonies (DFD) like overbites and underbites can impact speech sound production.
- Previous research indicated altered spectral properties in consonants for DFD patients, but findings were inconsistent.
Purpose of the Study:
- To investigate the acoustic differences in consonant production among patients with severe overbites (Class II), underbites (Class III), and anterior open bites.
- To clarify the articulatory basis of speech sound alterations in DFD patients using spectral shape measures.
Main Methods:
- Multitaper spectral analysis was employed to analyze consonant sounds.
- Spectral shape measures were applied to differentiate speech patterns in DFD patient groups and controls.
Main Results:
- All DFD patient groups exhibited less prominent mid-frequency spectral peaks for /s ʃ t tʃ/ compared to controls.
- Peak frequency measures for these consonants remained consistent across all DFD groups and controls.
- The findings suggest differences in the sibilant noise source rather than variations in front cavity size.
Conclusions:
- DFD patients demonstrate altered spectral characteristics in specific consonant sounds, primarily related to the noise source.
- These findings provide a more nuanced understanding of speech production in individuals with malocclusion.
