The aim of this study is to determine the sound characteristics of speech sounds of patients applied to orthodontics clinic to understand how speech will be affected after orthodontic treatment. The study included 60 patients (35 females, 25 males; 13.60±2.35 years) Fricatives (/f/, /s/, /ş/) were selected for spectral center of gravity analysis. Sounds were examined under four groups: syllable-initial, syllable-final, /a/ context and /i/ context. The Shapiro Wilk test and Mann-Whitney U-test, were used for statistical evaluations. There was a statistically significant difference between syllable-initial and syllable-final measurements of /f/ sound (p=0.008). There was a significant effect of gender in all groups of /s/ sound and syllable-initial group of /ş/ sound (p
Key words: Speech sounds, speech acoustics, orthodontics
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