Christian Lucas

University of Greifswald, Griefswald, Mecklenburg-Vorpommern, Germany

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Publications (6)25.94 Total impact

  • C. Lucas · B. Kordaß
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    ABSTRACT: Das Beschwerdebild kraniomandibulärer Dysfunktionen kann einerseits mittels zahnärztlicher klinischer Untersuchungstechniken diagnostiziert werden. Neben der klinischen Funktionsdiagnostik mit Palpation der Kaumuskulatur, Überprüfung der Bewegung der Kiefergelenke sowie Kontrolle der Okklusion kommt die Anfertigung von Modellen des Ober- und Unterkiefers infrage. Darüber hinaus erfordert die Vielfalt der Beschwerdebilder andererseits vom behandelnden Zahnarzt Kenntnisse der Möglichkeiten und Grenzen der Magnetresonanztomographie (MRT) aus zahnärztlich diagnostischer Sicht. Im vorliegenden Beitrag werden technische Grundlagen, ein typischer Untersuchungsablauf, Indikationen und Kontraindikationen bei der MRT dargestellt.
    No preview · Article · May 2014
  • Martin Lotze · Christian Lucas · Martin Domin · Bernd Kordass
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    ABSTRACT: Occlusal splints are a common and effective therapy for temporomandibular joint disorder. Latest hypotheses on the impact of occlusal splints suggest an altered cerebral control on the occlusion movements after using a splint. However, the impact of using a splint during chewing on its cerebral representation is quite unknown. We used functional magnetic resonance imaging (fMRI) to investigate brain activities during occlusal function in centric occlusion on natural teeth or on occlusal splints in fifteen healthy subjects. Comparisons between conditions revealed an increased activation for the bilateral occlusion without a splint in bilateral primary and secondary sensorimotor areas, the putamen, inferior parietal and prefrontal cortex (left dorsal and bilateral orbital) and anterior insular. In contrast, using a splint increased activation in the bilateral prefrontal lobe (bilateral BA 10), bilateral temporo-parietal (BA 39), occipital and cerebellar hemispheres. An additionally applied individually based evaluation of representation sites in regions of interest demonstrated that the somatotopic representation for both conditions in the pre- and postcentral gyri did not significantly differ. Furthermore, this analysis confirmed the decreasing effect of the splint on bilateral primary and secondary motor and somatosensory cortical activation. In contrast to the decreasing effect on sensorimotor areas, an increased level of activity in the fronto-parieto-occipital and cerebellar network might be associated with the therapeutic effect of occlusal splints. Hum Brain Mapp, 2011. © 2011 Wiley-Liss, Inc.
    No preview · Article · Dec 2012 · Human Brain Mapping
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    ABSTRACT: There is some controversial discussion within the therapy of craniomandibular disorders (CMDs) about the mode of action of occlusal splints. Here we present a case report on one CMD-patient measuring cerebral activation changes with functional magnetic resonance imaging (fMRI) before and after therapy with a stabilization splint. Wearing the Michigan splint for 11 nights and partially days resulted in substantial pain relief and changes in occlusal movement performance. Cerebral activation during occlusion was decreased after therapy (PRE-POST) in bilateral sensorimotor regions but also additional areas such as left posterior insula, right superior temporal cortex and bilateral occipital lobe. During the first usage of the splint in the scanner (PRE) increased activation in the left dorsolateral prefrontal lobe (BA 9) was observed. After splint training occlusion with the splint compared to without a splint increasingly involved the left superior parietal lobe (BA 7, POST). Whereas BA 9 might be associated with increasing working memory load due to the manipulation with an unusual object, the BA 7 activation in the POST session might document increased sensorimotor interaction after getting used to the splint. Our findings indicate that wearing an occlusion splint triggers activation in parietal sensorimotor integration areas, also observed after long periods of sensorimotor training. These additional recourses might improve coordination and physiological handling of the masticatory system.
    Full-text · Article · Oct 2011 · Annals of anatomy = Anatomischer Anzeiger: official organ of the Anatomische Gesellschaft
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    ABSTRACT: Brain imaging based on functional magnetic resonance (fMRI) is a useful tool for examination of neuronal networks and cerebral structures subserving visiospatial function. The purpose of this study was to compare the brain activity during chewing and occlusal function in centric occlusion on natural teeth or on occlusal splints. Four tasks were performed by 13 healthy, fully dentate subjects (21-32 years old, 6 female and 7 male): occlusal tap-tap movements in centric occlusion by natural teeth, after application of a maxillary occlusal splint and chewing movements on left and right sided rubberdam strips. In order to reveal which areas of the brain were more strongly activated, conjunction analyses between the different tasks were performed for each subject and for the average values of brain signal activity of all subjects. Whilst several known foci of activity were subtracted, differences of significant activity rested in areas of the sensorimotor cortex. Mainly ipsitaterality of hemispheres concerned the left and right sided chewing, whereas the conjunction between tap-tap movements on natural teeth and splint occlusion indicated only one weak, but significant activation foci. The study confirms fMRT as one of the most useful developing methods to clear up neuro-cortical effectiveness of occlusion and occlusal therapy.
    No preview · Article · Feb 2007 · Annals of Anatomy - Anatomischer Anzeiger
  • M. Lotze · C. Lucas · M. Domin · S. Langner · B. Kordass

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  • M. Lotze · C. Lucas · M. Domin · S. Langner · B. Kordass

    No preview · Article · · Advances in anatomy, embryology, and cell biology