Functional Shift of the Mandible, Mandibular Asymmetry
Conditions
Keywords
Early treatment, Posterior unilateral cross bite, Quad helix
Brief summary
To compare the effectiveness of the Quad Helix, an orthopaedic conventional appliance, in the correction of skeletal mandibular asymmetry, on frontal x-ray, in subjects treated before or after 7 years.
Detailed description
Introduction : Unilateral posterior crossbite (UPCB), often from dysfunctional and para-functional causes, leads to positional mandibular asymmetries that can develop at a very young age into skeletal mandibular deviation; hence the interest of early maxillary expansion. The purpose of this retrospective study was to compare the impact of maxillary expansion by Quad Helix (QH) on mandibular skeletal asymmetry correction before and after 7 years of age. Materials and methods : All children with UPCB and skeletal mandibular asymmetry, who were treated by QH in the orthodontic department between February 2017 and August 2018 and who have done a radiography file at baseline (T0) and 12 months later (T1) have been included. The patients were divided into two groups according to age: under 7 years of age (early group G1) with QH adjusted on second primary molars and over up to 13 years old (late group G2) with QH adjusted on first permanent molars. The differences between the right and left sides of the mandible in corpus length L (main eligibility criterion) and ramus height H (secondary criterion) were compared between groups. X² test, Fisher's exact test and Wilcoxon rank-sum tests were used for baseline comparisons. A multifactorial analysis allowing adjustment on possible confounding factors was used with R software at a significance level of 5%.
Interventions
DEVICEMaxillary expansion with conventional Quad Helix bonded on molars.
Maxillary expansion with conventional Quad Helix bonded on molars
Sponsors
University Hospital, Montpellier
Study design
Observational model
CASE_CONTROL
Time perspective
RETROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
4 Years to 13 Years
Healthy volunteers
No
Inclusion criteria
* Unilateral Posterior Crossbite (at least one tooth) and skeletal mandibular asymmetry * Treated by Quad Helix in the Orthodontic Department of the CHU Montpellier * with frontal X-rays available at baseline and 12months later
Exclusion criteria
* Incomplete File * Inadequate quality of x-rays
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Difference in the mandibular corpus length between the right and left side | 1 day | Difference in the mandibular corpus length between the right and left side : △L on conventional frontal x-ray. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Difference in the mandibular ramus height between the right and left side of the mandibule | 1 day | Difference in the mandibular ramus height between the right and left side of the mandibule : △H on conventional frontal x-ray. |
Countries
France
Outcome results
None listed