Effects of orthognathic surgery on speech and breathing of subjects with cleft lip and palate: acoustic and aerodynamic assessment.

Objective: To evaluate the impact of orthognathic surgery on acoustic nasalance of subjects with cleft and investigate the causes of possible changes by analyzing velopharyngeal function and nasal patency.

Methods: Nasalance was measured in 29 subjects with operated cleft palate +/- lip before (PRE) and 45 days (POST1) and 9 months (POST2) after surgery, on average. In 19 of the patients, the minimum velopharyngeal (VP) and nasal cross-sectional (N) areas were also determined. Methods: Le Fort I osteotomy with maxillary advancement in combination with procedures involving the nose, maxilla, mandible or all three. Methods: Nasalance, VP area, N area.

Results: We observed: (1) a significant (p < .05) increase in mean nasalance at POST1 and POST2, compared with PRE during the reading of oral sentences and nasal sentences; at POST2, high nasalance on the oral sentences was observed in 45% of the patients with normal nasalance at PRE, and 57% of patients with low nasalance on the nasal sentences at PRE no longer presented abnormal nasalance; (2) a significant increase in mean VP area at POST1; two borderline patients demonstrated deterioration of VP closure at POST2, compared with PRE; and (3) a significant increase in mean N area at POST2, with 73% of patients no longer presenting subnormal areas seen at PRE.

Conclusions: On a long-term basis, orthognathic surgery modifies speech nasalance of some subjects with cleft, perhaps because of an increase in internal nose size. This may also improve nasal patency for breathing.