Spearman’s rank correlation coefficient was used to judge the correlation between the analysis results of both programs regarding F1 and F2 and their respective formant ranges. Thirty-seven participants were enrolled in this study for formant analysis of the five Japanese vowels (a/i/u/e/o) using CSL and Praat. Methods: CSL was used as a reference to evaluate the accuracy of Praat with both the default and newly proposed adjusted settings. Therefore, this study aimed to determine if both software produced comparable results for the first two formant frequencies (F1 and F2) and their respective formant ranges obtained from the same voice samples from Japanese participants with maxillectomy defects. Although CSL is a commercial product, Praat is freely available on the internet and can be used by patients and clinicians to practice several therapy goals. For that purpose, several acoustic software packages have been used for speech evaluation, among which Computerized Speech Lab (CSL) and Praat are widely used in clinical and research contexts. Maxillofacial prosthodontists play a critical role in restoring this function so that affected patients can enjoy better lives. Introduction: Speech impairment is a common complication after surgical resection of maxillary tumors. 2Department of Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.1Department of Advanced Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.Ali 1,2 Yuka Sumita 1* Noriyuki Wakabayashi 1
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