Maxillofac Plast Reconstr Surg.  2017 Apr;39(4):9. 10.1186/s40902-017-0108-2.

The comparative study of resonance disorders for Vietnamese and Korean cleft palate speakers using nasometer

  • 1Department of Speech-Language Therapy, Howon University, Gunsan City, Republic of Korea.
  • 2Department of Oral & Maxillofacial Surgery, Institute of Oral Bioscience, School of Dentistry, Clinical Research Institute of Chonbuk National University Hospital, Chonju City, Korea.
  • 3Department of Speech-Language Therapy, Graduate School, Research Institute of Speech Sciences, Chonbuk National University, 20 Gungiro Road, Duckjin-Gu, Jeonju City, Chonbuk 561-180 Korea.


Nasalance 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.
Ten 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. RESULT: The 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.
These different nasalance scores of the same vowels seem to cause an ethnic difference between Vietnamese and Korean cleft palate children.


Nasalance; Ethnic difference; Nasometer; Cleft palate
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