The relationship of vocal tract dimensions and substitution of the palatal approximant /j/ for the alveolar trill /r/.

Abstract

PURPOSE:

To investigate the relationship of the vocal tract dimensions and dental arches in participants with substitution of palatal approximant /j/ for the trill variant of /r/.

METHOD:

Cephalograms and dental casts of 60 native speakers of Arabic were used for comparison. The experimental group included 30 participants with substitution of /j/ for the trill variant of /r/ (17 males and 13 females, age ranged between 15-20 years, M = 18.7 years, SD = 1.27). The control group included 30 normal speakers (15 males and 15 females, age ranged between 15-20 years, M = 18.3 years, SD = 1.67). Both groups had class I occlusion.

RESULT:

The experimental group showed significantly shorter maxillary length, p < 0.05, and narrower vocal tract dimensions compared to the control group, p < 0.05. Tongue length (TGL) and height (TGH) and soft palate length (PNSP) and thickness (MPT) were statistically significantly reduced in the experimental group compared to the control group, p < 0.05. The distance between the hyoid bone and retrognathion or C3 was significantly shorter in the experimental group compared to the control group, p < 0.05. Inter-canine widths and dental arch lengths were significantly shorter in the experimental group compared to the control group, p < 0.05.

CONCLUSION:

The substitution of /j/ for the trill variant of /r/ is associated with altered dimensions of the vocal tract. These alterations may explain the residual articulation disorder during the production of the trilled /r/ compared to other sound classes that respond to speech therapy. Orthodontic and Maxillo facial surgery consultation might be needed when providing therapy to individuals with this particular articulation disorder.

• Authors: Firas Alfwaress, Emad Al Maaitah, Suzan Al-Khateeb, Zakaria Abu Zama
• Journal: International journal of speech-language pathology (Int J Speech Lang Pathol) Vol. 17 Issue 5 Pg. 518-26 ( 2015) ISSN: 1754-9515 [Electronic] England
• PMID: 25861878 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Topics

• Adolescent
• Cephalometry
• Female
• Humans
• Larynx (anatomy & histology)
• Male
• Mouth (anatomy & histology)
• Nasal Cavity (anatomy & histology)
• Pharynx (anatomy & histology)
• Speech (physiology)
• Young Adult