<![CDATA[The position of the tongue and teeth as the articulatory settings form sounds during speech production. Understanding this, this study aims to discover sound alternation outcomes that are affected the most by changes in jaw position, which caused misaligned teeth position, namely Class III malocclusion or underbite condition. As a participant in this study, a Universitas Airlangga student is required to perform reading tasks focusing on the consonant sounds in their first language, Indonesian. A qualitative study is utilized to analyze sound alternation, following theories from Field (2004) in the Psycholinguistics study and Dardjowidjojo (2009) in the Phonetics study. Voice recordings of reading exercises using three texts were collected from the two participants. Analysis of this data showed that both individuals frequently substituted the /s/ and /z/ sounds, accounting for the majority (76.25%) of all sound changes observed. Furthermore, the study identified other sound alterations, including insertions (7.5%), deletions (12.5%), and metathesis (3.75%). These results suggest that an underbite affects the production of various sounds, not just the substitution of the sibilants /s/ and /z/. The researchers expect this study to contribute to psycholinguistics studies by providing sound alternations surveys of people with Class III malocclusion conditions. ]]>
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