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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie

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20.02.2018 | Original Article

Mandibular fossa morphology during therapy with a fixed functional orthodontic appliance

A magnetic resonance imaging study

verfasst von: Gero Stefan Michael Kinzinger, Jan Hourfar, Cornelia Kober, Univ.-Prof. Dr. Jörg Alexander Lisson

Erschienen in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie | Ausgabe 2/2018

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Abstract

Objective

During therapy of distoclusion entailing a rigid, fixed orthodontic appliance, the mandibular fossa and condyle are ideally remodeled, while dentoalveolar effects occur through adaptive mechanisms. Adaptive processes, especially in the fossa region, have not been adequately investigated. Our magnetic resonance imaging (MRI) investigation aimed to assess the effects of therapy with a functional mandibular advancer (FMA) on mandibular fossa morphology.

Patients and methods

We monitored via MRI the therapeutic course of 25 patients at three time points. Visual findings and metric assessments were carried out in the sagittal plane. Three-dimensional (3D) reconstructions of the joint structure of two exemplary patients were also made.

Results

Visual examinations of the MRI slices at the three time points revealed no changes in fossa shape in any of the 50 temporomandibular joints. Lateral comparisons showed that the morphology of the fossae of all 25 patients was identical. Metric analysis demonstrated no significant alterations in width, depth, or in their ratio, not even laterally. Nine measurements of the distances between the porion, mandibular fossa, and articular eminence revealed no significant changes in total or on the left and right sides, or intralaterally.

Conclusion

The visual findings and metric analyses of parasagittal MRI slices did not indicate any morphological changes in the mandibular fossa or articular eminence in patients with distoclusion treated via a rigid, fixed orthodontic appliance. However, special reworking of the MRI data facilitated reconstruction of the surfaces of joint structures in 3D. This new method makes it possible to depict more accurately and noninvasively the adaptive mechanisms not ascertainable via metric methods and to assess them as 3D structures.

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Titel: Mandibular fossa morphology during therapy with a fixed functional orthodontic appliance
A magnetic resonance imaging study
verfasst von: Gero Stefan Michael Kinzinger
Jan Hourfar
Cornelia Kober
Univ.-Prof. Dr. Jörg Alexander Lisson
Publikationsdatum: 20.02.2018
Verlag: Springer Medizin
Erschienen in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie / Ausgabe 2/2018
Print ISSN: 1434-5293
Elektronische ISSN: 1615-6714
DOI: https://doi.org/10.1007/s00056-018-0124-6

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