Dysmorphies maxillo-mandibulaires : retentissement sur la voix, l’articulation et les praxies bucco-linguo-faciales

Abstract : Purpose: The aim of this study was to define whether patients, in preoperative or postoperative stage for dentofacial deformity, display voice alterations, speech disorders and motor function disorders of their oro-facial system. Another aim was to determine whether orthognathic surgery successfully overcomes these disorders.
Subjects and methods: Two groups were presented with an objective assessment (computerized assessment of voice and speech, evaluation of oro-facial praxia, cephalometric analysis) and a subjective assessment (evaluation of vocal parameters) .
Subjects were 21 patients in preparatory phase with Class II or Class III skeletal deformities and 13 patients in postoperative phase. Results: Regarding vocal parameters, almost half of the patients of two groups have pathological maximum time of phonation and more than 80% of patients have moderate dysphonia. Voice disorders could be correlated with abnormal frequency of formants and position of hyoid bone for patients in preoperative phase. Regarding articulation and orofacial praxia, patients in the two groups show alteration of orbicular and buccinators muscles leading to a deterioration of occlusive consonants: bilabial consonant /b/ and velar consonant /g/.
Conclusion: Patients in preoperative or postoperative stage for dentofacial deformity, display voice alterations, speech disorders and motor function disorders of their oro-facial system. Orthognathic surgery doesn’t seem to significantly alleviate these disorders. Speech therapy is recommended before surgery.
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Charlotte L’enfant. Dysmorphies maxillo-mandibulaires : retentissement sur la voix, l’articulation et les praxies bucco-linguo-faciales. Sciences cognitives. 2018. ⟨dumas-02083132⟩

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