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  • Title: Asymmetry of the parental craniofacial skeleton in orofacial clefting.
    Author: McIntyre GT, Mossey PA.
    Journal: J Orthod; 2002 Dec; 29(4):299-305; discussion 278-9. PubMed ID: 12444271.
    Abstract:
    OBJECTIVE: To evaluate size-related and shape-related craniofacial skeletal asymmetries in the parents of children with orofacial clefting (OFC). DESIGN: Retrospective PA cephalometric study. SETTING: Glasgow/Dundee, Scotland. SUBJECTS: Ninety-two parental volunteers from a completely ascertained sample of 286 children born with OFC between 1980-1984 in the West of Scotland. INTERVENTIONS: None. MAIN OUTCOME MEASURES: A conventional cephalometric asymmetry analysis (CCAA) evaluated size-related right:left asymmetry comprising eight linear distance, nine angular, and three mid-facial area measurements. The right and left landmark configurations were uniformly scaled using Procrustes superimposition and Euclidean Distance Matrix Analysis (EDMA) evaluated shape-related right-left asymmetry. RESULTS: The three linear distances, nine angles and two areas differed between the right and left sides of the craniofacial complex (P <0.05) indicate size asymmetry characterized by a wider left side of the face and a shorter vertical dimension on the right side (directional asymmetry). EDMA detected shape asymmetry [T statistic = 2.671 (P = 0.10)]. Forty per cent of the EDMA ratios were clinically importantly larger or smaller on the left and right sides respectively, involving landmarks anatomically and morphogenetically important in OFC. CONCLUSION: Size and shape directional asymmetries characterize the parental craniofacial skeleton in OFC. This heritable directional craniofacial skeletal asymmetry could be of relevance in the left-sided predilection of OFC.
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