The influence of dental prostheses on the production of fricatives

Autor: Horga, Damir, Badel, Tomislav, Liker, Marko, Vidović, Ana
Jazyk: chorvatština
Rok vydání: 2013
Předmět:
Zdroj: Hrvatska revija za rehabilitacijska istraživanja
Volume 49
Issue Supplement
ISSN: 1848-7734
1331-3010
Popis: Gubitakom zuba te nošenjem zubne proteze mijenjaju se anatomska obilježja vokalnoga trakta. Promjene vokalnoga trakta dovode do prilagodbi govornikovih uobičajenih artikulacijskih programa, a one imaju za cilj proizvodnju razumljivoga govora. Načelo artikulacijske ekvivalentnosti omogućuje takvim govornicima proizvodnju akustički razmjerno prihvatljivoga govora. Međutim, pri izgovoru aerodinamički zahtjevnih glasnika, poput frikativa, javljaju se razlike u proizvodnji govora između govornika sa zubnom protezom i govornika uredne denticije. U ovom je istraživanju analizirana proizvodnja frikativa u govornika s dentalnom protezom (N=33) te su njihovi rezultati uspoređeni s rezultatima ispitanika uredne denticije (N=10). Govor tridesetitroje govornika s protezom analiziran je u dva uvjeta: s protezom i bez nje. Analizirana je proizvodnja šest hrvatskih frikativa u 18 beznačenjskih riječi simetrične vokalske okoline (VKV; V=/i, a, u/; K=/Ʒ, ʃ, z, s, f, x/). Analizirano je šest akustičkih varijabli: 1. trajanje frikativa, 2. težište spektra šuma, 3. raspršenje sprektra šuma, 4. nagib spektra šuma, 5. istaknutost najjače amplitude spektra šuma, te 6. intenzitet šuma frikativa. Govorni materijal snimljen je u standardnim fonetskim laboratorijskim uvjetima. Akustička analiza provedena je programom Praat, a statistička obrada i vizualizacija rezultata programom MS Excel. Rezultati su pokazali da su akustičke karakteristike frikativa u govornika koji nose protezu bliže kontrolnoj skupini kada nose protezu, nego kad su bez nje.
The loss of teeth and the wearing of dental prostheses create changes in the anatomical features of the vocal tract. Changes in the vocal tract produce changes in speakers’ habitual articulatory programmes in order to produce intelligible speech. The articulatory equivalence principle enables speakers to produce acoustically relatively acceptable speech. However, differences in speech production between patients with dental prostheses and healthy speakers can still be observed, especially in aerodynamically demanding sounds, such as fricatives. In the present investigation we analyse the production of fricatives in speakers with dental prostheses (N=33) and compare their production with eugnathic controls matched in age (N=10). The speech of 33 dental-prostheses-wearing patients was also analysed with and without prosthesis in situ. The productions of six Croatian fricatives were analysed: /Ʒ, ʃ, z, s, f, x/. The speech material consisted of 18 VCV meaningless sequences (V represented /i/, /a/, /u/, while C represented one of the six fricatives). Six acoustic variables were measured: 1. fricative duration, 2. centre of gravity of the noise spectrum, 3. standard deviation of the centre of gravity, 4. skewness, 5. kurtosis and 6. fricative noise intensity. The speech material was recorded in the standard phonetic laboratory conditions in a sound treated room. The acoustic analysis was performed by means of the Praat programme and MS Excel was used for statistical analyses. The results showed that the acoustic characteristics of the sounds produced with the prostheses were closer to the acoustic characteristics of the controls compared to the characteristics of sounds produced without prostheses.
Databáze: OpenAIRE
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