Badel Tomislav, Marotti Miljenko, Kern Josipa, Laskarin Mirko
Department of Prosthodontics, School of Dental Medicine, University of Zagreb, HR-10000 Zagreb, Croatia.
Ann Anat. 2009 Jun;191(3):280-7. doi: 10.1016/j.aanat.2008.12.004. Epub 2009 Feb 12.
The effects of the Michigan splint on the change in disc displacement (DD) as well as the position of the condyles were determined by metrical analysis using magnetic resonance imaging (MRI).
Twenty-five patients with clinical DD symptoms were treated by means of the Michigan splint, and an assessment of the effects of the splint was conducted or verified by MRI before and during the period of therapy, 5 months follow-up. The positions of the condyles and the disc were calculated from the MRI in the parasagittal plane.
There were no changes in the positions of the disc and condyles in the physiological joints of the patients (n=23) prior to and during the time the splint was in place (p>0.05). The splint achieved a DD decrease (p<0.05), and pain was eliminated in 69.2% of the DD joints with reduction (n=13). As far as the DD joints without reduction (n=13) are concerned, pain was eliminated in 74.9% of the joints, that is, without any change in the positions of the disc and condyles (p>0.05).
The evaluation of the Michigan splint therapy showed that it has no influence in the repositioning of the DD joints without reduction, but the DD joints with reduction have a limited positive effect. In both forms of these displacements, conditions for the elimination of the clinical symptoms are created.
通过磁共振成像（MRI）的测量分析，确定密歇根矫治器对椎间盘移位（DD）变化以及髁突位置的影响。
25例有临床DD症状的患者接受密歇根矫治器治疗，并在治疗前、治疗期间以及5个月随访时通过MRI对矫治器的效果进行评估或验证。从矢状旁平面的MRI图像计算髁突和椎间盘的位置。
在佩戴矫治器之前和期间，患者（n = 23）生理关节中的椎间盘和髁突位置没有变化（p>0.05）。矫治器使DD减小（p<0.05），在69.2%的有复位的DD关节（n = 13）中疼痛消除。就无复位的DD关节（n = 13）而言，74.9%的关节疼痛消除，即椎间盘和髁突位置无任何变化（p>0.05）。
密歇根矫治器治疗的评估表明，它对无复位的DD关节重新定位没有影响，但对有复位的DD关节有有限的积极作用。在这两种移位形式中，都创造了消除临床症状的条件。
