A 23-year-old female patient with microglossia and micrognathia was report-ed with respect to articulation. The case was treated by gradual expansion of the mandibular dental arch followed by double-jaw orthognathic surgery.
1. As before treatment, /t, d, n, r/, sounds were distorted and almost like palatalized articulation; they were made with the tongue and the posterior part of the palate. Her /s, dz, is/, sounds were distorted and almost like /f, v, pf /, in this instance made with the upper teeth and the lower lip. Both before and after treatment, no changes were seen in articulation place or manner.
2. Single-mora intelligibility had declined at 6 months after surgery. However, at 9 months after surgery it was improved to a level as good as that before the total treatment.
3. Sentence intelligibility had declined at 6 months after surgery. However, at 1 year and 3 months after surgery it was improved to a level as good as that before the total treatment. The tendency of mishearing was also the same as before the total treatment.
4. Masticatory function had also improved. In this treatment, improvement was achieved in both occlusion and mastication without any damage in articulatory function.
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