A new simple evaluation method of the monosyllable /sa/ using a psychoacoustic system in maxillectomy patients

Journal of Prosthodontics

et al. 2017

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mentioning

confidence: 99%

Digitized Speech Characteristics in Patients with Maxillectomy Defects

Elbashti

Journal of Prosthodontics

et al. 2017

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“…In fact, VOT measurements can reveal the mechanism of consonant unnaturalness in maxillectomy patients. With further research, changes in VOT might explain the difference in psychoacoustic features between maxillectomy speech and normal speech [5]. …”

Section: Resultsmentioning

confidence: 99%

“…Sumita et al [4] evaluated the speech of maxillectomy patients using vowel formant analysis, while Prunkngarmpun et al [3] used a nasometer. Chowdhury et al [5] introduced psychoacoustic evaluation of the syllable /sa/ with these patients. However, it is difficult to conduct detailed assessments of other consonant articulations.…”

Section: Introductionmentioning

confidence: 99%

“…Although Ichikawa et al [12] studied the influence of wearing a palatal plate on VOT in four normal subjects and Akpinar et al [13] studied changes in VOT before and after soft palate implant surgery, VOTs in maxillectomy patients have yet to be determined. One reason for this is that, due to air leakage through the nose, maxillectomy speech is characterized by formant impairment [4] and low energy consonant production [5]. Formant impairment makes it difficult to detect onset of vocal vibration, and low energy consonant production makes it difficult to detect the burst point.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Voice Onset Time in Maxillectomy Patients

The Scientific World Journal

Taniguchi

2014

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Objective speech evaluation using acoustic measurement is needed for the proper rehabilitation of maxillectomy patients. For digital evaluation of consonants, measurement of voice onset time is one option. However, voice onset time has not been measured in maxillectomy patients as their consonant sound spectra exhibit unique characteristics that make the measurement of voice onset time challenging. In this study, we established criteria for measuring voice onset time in maxillectomy patients for objective speech evaluation. We examined voice onset time for /ka/ and /ta/ in 13 maxillectomy patients by calculating the number of valid measurements of voice onset time out of three trials for each syllable. Wilcoxon's signed rank test showed that voice onset time measurements were more successful for /ka/ and /ta/ when a prosthesis was used (Z = −2.232, P = 0.026 and Z = −2.401, P = 0.016, resp.) than when a prosthesis was not used. These results indicate a prosthesis affected voice onset measurement in these patients. Although more research in this area is needed, measurement of voice onset time has the potential to be used to evaluate consonant production in maxillectomy patients wearing a prosthesis.

“…Accurate evaluation of speech ability is important for proper speech rehabilitation, which helps to reintegrate maxillectomy patients into society. Many studies have been performed to establish a speech evaluation method for maxillectomy patients . Some researchers have used speech intelligibility tests to evaluate patients' speech ability , whereas others have used digital processing methods that do not depend on perceptual determinants .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of articulation simulation system using artificial maxillectomy models

Elbashti

J of Oral Rehabilitation

et al. 2015

Acoustic evaluation is valuable for guiding the treatment of maxillofacial defects and determining the effectiveness of rehabilitation with an obturator prosthesis. Model simulations are important in terms of pre-surgical planning and pre- and post-operative speech function. This study aimed to evaluate the acoustic characteristics of voice generated by an articulation simulation system using a vocal tract model with or without artificial maxillectomy defects. More specifically, we aimed to establish a speech simulation system for maxillectomy defect models that both surgeons and maxillofacial prosthodontists can use in guiding treatment planning. Artificially simulated maxillectomy defects were prepared according to Aramany's classification (Classes I-VI) in a three-dimensional vocal tract plaster model of a subject uttering the vowel /a/. Formant and nasalance acoustic data were analysed using Computerized Speech Lab and the Nasometer, respectively. Formants and nasalance of simulated /a/ sounds were successfully detected and analysed. Values of Formants 1 and 2 for the non-defect model were 675.43 and 976.64 Hz, respectively. Median values of Formants 1 and 2 for the defect models were 634.36 and 1026.84 Hz, respectively. Nasalance was 11% in the non-defect model, whereas median nasalance was 28% in the defect models. The results suggest that an articulation simulation system can be used to help surgeons and maxillofacial prosthodontists to plan post-surgical defects that will be facilitate maxillofacial rehabilitation.