Malocclusion in children with speech sound disorders and motor speech involvement: a cross-sectional clinical study in Swedish children

Eur Arch Paediatr Dent. 2022 Aug;23(4):619-628. doi: 10.1007/s40368-022-00728-4. Epub 2022 Jul 1.


Objectives: The objectives of this study were to investigate the occurrence, types and severity of malocclusions in children with speech sound disorder (SSD) persisting after 6 years of age, and to compare these findings to a control group of children with typical speech development (TSD).

Methods: In total, 105 children were included: 61 with SSD and motor speech involvement (mean age 8:5 ± 2:8 years; range 6:0-16:7 years, 14 girls and 47 boys) and 44 children with TSD (mean age 8:8 ± 1:6; range 6:0-12:2 years, 19 girls and 25 boys). Extra-oral and intra-oral examinations were performed by an orthodontist. The severity of malocclusion was scored using the IOTN-DHC Index.

Results: There were differences between the SSD and TSD groups with regard to the prevalence, type, and severity of malocclusions; 61% of the children in the SSD group had a malocclusion, as compared to 29% in the TSD group. In addition, the malocclusions in the SSD group were rated as more severe. Functional posterior crossbite and habitual lateral and/or anterior shift appeared more frequently in the SSD group. Class III malocclusion, anterior open bite and scissors bite were found only in the SSD group.

Conclusion: Children with SSD and motor speech involvement are more likely to have a higher prevalence of and more severe malocclusions than children with TSD.

Keywords: Co-existing disorders; IOTN-DHC; Multiprofessional assessment; Orofacial characteristics.

MeSH terms

  • Child
  • Cross-Sectional Studies
  • Female
  • Humans
  • Male
  • Malocclusion* / epidemiology
  • Speech
  • Speech Sound Disorder* / epidemiology
  • Sweden