Study of temporomandibular joint and mandibular symmetry in adult patients with unilateral posterior crossbite by using cone beam computed tomograpgy
Objective To understand the impact of long-term asymmetric occlusion on thetemporomandibular joint and mandibular,and to research into the changes in the temporomandibular joint and mandibular in adult patients with unilateral posterior.Methods 20 adult patients with unilateral posterior crossbite were selected as the experimental group and 15 normal individuals as the control group.InvivoDental 5.1 software was used to measure the condyle's anterior and posterior distance,internal and external distance,its outer diameter-sagit-tal angle,condyle and median stal tal,articular fossa front up and back space,articular fossa width and depth,tilt angle of the posterior wall of the articular nodule,bottom angle of the mandible,mandible length,and man-dible comprehensive length.Results Comparing the two sides of the experimental group showed no differenc-es in the temporomandibular joint shape,position and mandibular morphology.Crossbite side,condylar and amorphous surface angle and superior space crossbite side in the experimental group were less than control group,while articular fossa width,bottom angle of mandible and mandibular angle were larger.Noncrossbite side,condylarandamorphous surface length and superior space normal side in the experimental group were less than control group,while articular fossa width and mandibular angle,mandible length and mandible com-prehensive length were larger.Conclusion The shape and position of the temporomandibular joint and the morphology of the mandible on the both sides of an normal adult individual was basically symmetrical.Asym-metric temporomandibular joint on both sides in the adult patients had unilateral posterior crossbite,and articu-lar fossa in such patients showed adaptive remodeling.Mandibular morphology of adult patients with unilater-al posterior crossbite were asymmetric.
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