The Study on the Acoustical Characteristics and Speech Intelligibility of Vowels Produced by the Maxillectomized Patients before and after Obturator-Wearing

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J Korean Soc Laryngol Phoniatr Logop > Volume 10(2); 1999 > Article

Journal of The Korean Society of Laryngology, Phoniatrics and Logopedics 1999;10(2): 140-148.

Palatal Cancer환자의 Obturator 장착전후 모음의 음향학적 특성과 말 명료도에 관한 연구

¹연세대학교 의과대학 이비인후과 음성언어의학연구소²연세대학교 치과대학 보철과³이화여자대학교 특수교육학과 언어병리학 협동과정

The Study on the Acoustical Characteristics and Speech Intelligibility of Vowels Produced by the Maxillectomized Patients before and after Obturator-Wearing

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ABSTRACT

The use of obturator is the prosthetic rehabilitation approach for restoration of the defected maxillary shape and function for the patients with palatal defect. The obturator can change the shape of vocal tract and nasality, but few reports on the effects of the change were presented. So, the authors performed the experimental study to compare the difference between the sizes of vowel triangles produced by maxillectomized patients before and after obturator-wearing and to consider how much improvement in speech intelligibility can be expected by obturator wearing. The 8 patients who were totally maxillectomized due to palatal cancer were participated as subjects. They produced 5 vowels(/a/, /i/, /u/, /e/, /o/) before and after obturator-wearing. The formants of the vowels were analyzed by the spectrogram of CSL, and their speech intelligibility were judged by normal 8 listeners. As results, the frequency of the first and the second formant showed no significant difference between the articulation before and after wearing, but the comparison of the sizes of vowel triangles, related with the speech intelligibility, showed significant difference. The vowel triangle of the articulation after wearing was larger than that of the articulation before wearing. /i/ showed the lowest speech intelligibility score among the vowel articulation before wearing. After wearing obturators, their scores increased on the whole, especially, in /a/, but the intelligibility of /u/ decreased after wearing.

KEY WORDS： Maxillectomy;Obturator;Speech intelligibility;