Abstract
BackgroundNasalance is used to evaluate the velopharyngeal incompetence in clinical diagnoses using a nasometer. The aim of this study is to find the nasalance differences between Vietnamese cleft palate children and Korean cleft palate children by measuring the nasalance of five oral vowels.MethodsTen Vietnamese cleft palate children after surgery, three Vietnamese children for the control group, and ten Korean cleft palate children after surgery with the same age participated in this experimentation. Instead of Korean control, the standard value of Korean version of the simplified nasometric assessment procedures (kSNAP) was used.ResultThe results are as follows: (1) the highest nasalance score among the Vietnamese normal vowels is the low vowel /a/; however, that of Korean normal vowels is the high vowel /i/. (2) The average nasalance score of Korean cleft palate vowels is 18% higher than that of Vietnamese cleft palate vowels. There was a nasalance score of over 45% among the vowels /e/ and /i/ in Vietnamese cleft palate patients and /i/, /o/, and /u/ in Korean cleft palate patients.ConclusionThese different nasalance scores of the same vowels seem to cause an ethnic difference between Vietnamese and Korean cleft palate children.
Highlights
Nasalance is used to evaluate the velopharyngeal incompetence in clinical diagnoses using a nasometer
This study evaluates the difference of nasalance depending on ethnic groups and language groups, based on the stimulus material which is standardized by a dental school in Chonbuk National University, which compared cleft palate patients in Hue, Vietnamese with the control group and Korean
This study is concerned about the analytic comparison of nasalance scores between Vietnamese and Korean cleft palate children with the control group in terms of ethnic and language differences
Summary
Nasalance is used to evaluate the velopharyngeal incompetence in clinical diagnoses using a nasometer. Cleft palate speakers generally have a deviation in speech resonance because of velopharyngeal incompetence (VPI). Evaluation of resonance disorder was mostly subjective evaluation which classifies degree of hypernasality such as stage 4 or stage 5. It was difficult for speech therapists who have difficulties with encountering cleft palate speakers to evaluate the degree of hypernasality. Nasometer is the equipment designed to solve the problems mentioned above, and it can measure nasal sounds. It is a computer-based instrument with an attached hardware sound card. If an acoustic sound signal from outside has a value of 100%, each acoustic
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