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Am J Orthod Dentofacial Orthop. 2016 Jul;150(1):116-23. doi: 10.1016/j.ajodo.2015.12.015.

Malocclusion and its relationship to speech sound production: Redefining the effect of malocclusal traits on sound production.

Author information

  • 1Private practice, Massapequa, NY.
  • 2Professor, Department of Orthodontics, College of Dentistry, New York University, New York, NY. Electronic address: pedort@aol.com.
  • 3Clinical specialist, researcher, Institute of Plastic and Reconstructive Surgery, NYU Langone Medical Center, New York, NY.

Abstract

INTRODUCTION:

The purpose of this study was to identify variables of dental malocclusion with the greatest effect on sound production that can be easily identified during an orthodontic assessment.

METHODS:

One hundred fifteen patients (8.2-36 years of age) seeking orthodontic evaluation were assessed for speech sound production abnormalities. An orthodontic clinical examination assessed Angle classification, overjet, overbite, crowding, spacing, and crossbites. A standard speech sample was elicited from each subject.

RESULTS:

The results indicated that 71 (62%) of the subjects made a production error, particularly with the /s/ and /t/ sounds. However, auditory distortions occurred in 12 subjects (20%), and 56 (80%) subjects had visual distortions of the sound. An open bite (>2 mm) was the key malocclusal factor underlying speech sound errors. There was statistical significance between the Orthodontic Treatment Priority Index and the sound errors of /s / and /t/ (mean score of 9.54 vs 6.29 for subjects without sound errors).

CONCLUSIONS:

Predictive malocclusal traits are associated with speech sound production errors. The more severe or handicapping the malocclusion, the more likely that a speech sound error will occur. Open bites of 2 mm are associated with sound production errors. Visual inaccuracy of the sound occurs with more frequency than auditory inaccuracy and is the most common articulation error noted with occlusal irregularities.

PMID:
27364213
DOI:
10.1016/j.ajodo.2015.12.015
[PubMed - in process]
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