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Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model

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Craniofacial morphological differences between Down syndrome and maxillary deficiency children.

Flávia Aline Silva Jesuino¹, José Valladares-Neto

¹Department of Orthodontics, Faculty of Odontology, Federal University of Goiás, Brazil.

European Journal of Orthodontics

|September 14, 2011

Summary

Children with Down syndrome (DS) exhibit reduced craniofacial dimensions compared to those with non-syndromic Class III malocclusion. However, DS presents a flatter cranial base and shorter maxillary length, differentiating it from typical maxillary deficiency.

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Area of Science:

Orthodontics and Craniofacial Morphology
Genetics and Developmental Biology
Pediatric Dentistry

Background:

Maxillary deficiency is a recognized feature in individuals with Down syndrome (DS).
Craniofacial morphology differences between DS and non-syndromic Class III malocclusion with maxillary deficiency are not fully understood.
Understanding these differences is crucial for targeted orthodontic and surgical interventions.

Purpose of the Study:

To compare craniofacial differences in white male children with Down syndrome (DS), non-syndromic skeletal Class III malocclusion with maxillary deficiency, and a skeletal Class I control group.
To elucidate the specific craniofacial characteristics that distinguish DS from non-syndromic maxillary deficiency.

Main Methods:

Lateral cephalometric radiographs were used to analyze craniofacial structures.
Three groups of white male children were studied: DS (n=30), skeletal Class III with maxillary deficiency (n=30), and skeletal Class I (n=30).
Statistical analysis included analysis of variance (ANOVA) and Tukey's tests to compare group differences.

Main Results:

The DS group exhibited significantly reduced anterior cranial base and facial dimensions compared to controls.
Maxillary length and facial convexity were reduced in the DS group, though maxillary position (SNA) was within normal limits.
A flattened cranial base (BaSN) and reduced maxillary length differentiated DS from non-syndromic Class III with maxillary deficiency.

Conclusions:

Down syndrome is characterized by generalized reduction in craniofacial dimensions, including a flatter cranial base and shorter maxilla.
While both DS and Class III malocclusion involve maxillary deficiency, the underlying craniofacial morphology differs significantly.
The overall smaller facial structure in DS may mask the severity of maxillary deficiency compared to non-syndromic cases.