ORONASAL FISTULAS IN CLEFT-PALATE PATIENTS AND THEIR INFLUENCE ON SPEECH

The size, site, and influence on speech of oronasal fistulas were stud ied in 12 patients with unilateral and 32 with bilateral cleft lip and palate. There were more and larger fistulas in the bilateral group. T he series was divided into: those with fistulas that affected speech ( group A, n = 18) and those with fistulas that did not affect their spe ech (group B, n = 26). Group A had significantly larger fistulas than group B, but there were no differences in the sites of the fistulas, e ither between the bilateral and unilateral groups or between groups A and B. Most fistulas were located in the region of the incisive forame n or in the hard palate. Judgements by listeners and analyses by the N ORAM instrument were made of the speech of 12 of the patients in group A before and after temporary covering of the fistulas. Significant di fferences in hypernasality, according to both listener's judgments and instrumental analyses were found. This finding is further evidence th at an oronasal fistula can influence and contribute to velopharyngeal dysfunction.