Phonetic analysis during treatment with rapid maxillary expander.
Orthod Craniofac Res
; 20(1): 21-29, 2017 Feb.
Article
in En
| MEDLINE
| ID: mdl-28102014
ABSTRACT
OBJECTIVES:
To investigate possible changes and/or device-related impairments in phonetic habits produced by rapid maxillary expansion (RME). MATERIALS ANDMETHODS:
Thirty-five patients scheduled for RME were divided into two groups Group A (banded two-arm Hyrax) and Group B (banded four-arm Hyrax). Speech samples were collected at six time points, before, during and after RME removal. Acoustical analysis was performed using PRAAT and BioVoice analysis tools. Ten volunteers completed a questionnaire on the acceptability of patient's speech. Maxillary dimensions and palatal volume were measured on dental casts before and after expansion using a digital gauge.RESULTS:
Voice analysis showed an increase in the peak frequency of fricative consonants (/s/,/Ê/) after expansion, whereas there was no change of formant frequencies of palatal consonants (/ɲ/,/Ê/). Vowel /i/ displayed a lowering of the first formant frequency, and an increase in the second and third formant frequencies. After bonding, Group B showed both a greater reduction in the peak frequency of fricatives and a greater increase in the formant frequencies of palatal consonants than Group A.CONCLUSION:
Rapid maxillary expansion causes a slight phonetic change in the acoustical parameters of both consonants and vowels. The two-arm Hyrax caused less speech impairment than the four-arm Hyrax during the treatment.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Speech Acoustics
/
Phonetics
/
Palatal Expansion Technique
Limits:
Adolescent
/
Child
/
Female
/
Humans
/
Male
Language:
En
Journal:
Orthod Craniofac Res
Journal subject:
ODONTOLOGIA
/
ORTODONTIA
Year:
2017
Document type:
Article
Affiliation country:
Italy