Background: This study investigated the factors involving joint effusion in patients with temporomandibular disorders. Methods: The magnetic resonance images of 131 temporomandibular joints (TMJs) of patients with temporomandibular disorders were evaluated. Gender, age, disease classification, duration of manifestation, muscle pain, TMJ pain, jaw opening disturbance, disc displacement with and without reduction, deformation of the articular disc, deformation of bone, and joint effusion were investigated. Differences in the appearance of symptoms and observations were evaluated using cross-tabulation. The differences in the amounts of synovial fluid in joint effusion vs. duration of manifestation were analyzed using the Kruskal–Wallis test. Multiple logistic regression analysis was performed to analyze the factors contributing to joint effusion. Results: Manifestation duration was significantly longer when joint effusion was not recognized (p < 0.05). Arthralgia and deformation of the articular disc were related to a high risk of joint effusion (p < 0.05). Conclusions: The results of this study suggest that joint effusion recognized in magnetic resonance imaging was easily observed when the manifestation duration was short, and arthralgia and deformation of the articular disc were related to a higher risk of joint effusion.
Background/Aim Polyolefin sheets are fabricated in the same manner as ethylene vinyl acetate sheets. The aim of this study was to examine the difference of vacuum‐formed mouthguard thickness according to each heating condition using ethylene vinyl acetate and polyolefin sheets. Materials and Methods Mouthguard sheets of 3.0 mm ethylene vinyl acetate and polyolefin were vacuum‐formed on working models at three heating temperatures: 85, 95, and 105°C. The thickness of the mouthguard was measured at the labial surface of the central incisor, the buccal surface of the first molar, and occlusal surface of the first molar. Differences in the thickness of the mouthguards according to the sheet materials and the heating conditions were analyzed by two‐way analysis of variance. Results Mouthguard thickness varied between the ethylene vinyl acetate and the polyolefin sheets (p < .01), and the thickness of the ethylene vinyl acetate sheet was greater than that of the polyolefin sheet at all heating conditions. The thicknesses of mouthguards fabricated using the ethylene vinyl acetate and the polyolefin sheets were not different for the three heating conditions in this study. Conclusions The thickness was greater for mouthguards fabricated using ethylene vinyl acetate sheet than when polyolefin sheet was used. The thickness of the mouthguards was not different for the three heating temperatures for both the ethylene vinyl acetate and the polyolefin sheets.
Background/Aim:The aim of this study was to investigate the factors contribute to the joint effusion in the patients with internal derangement on temporomandibular joint (TMJ) disorder.Methods:We reviewed the 83 TMJs that were diagnosed as internal derangement (anterior disc displacement with or without reduction) by magnetic resonance imaging. Joint effusion was diagnosed using T2-weighted images. The differences in the presence of joint effusion according to the gender, age, diagnosis, and TMJ pain were analyzed using cross-tabulation or Mann–Whitney test. The relationship between joint effusion and gender, age, diagnosis, and TMJ pain was analyzed by logistic multivariate regression analysis.Results:The presence of joint effusion was larger on anterior disc displacement without reduction (χ2[1] = 7.47,P= 0.006) and the TMJ with pain (χ2[1] = 7.50,P= 0.006). The results of logistic multivariate regression analyses indicated that the diagnosis of anterior disc displacement without reduction was significant in TMJ with joint effusion (odds ratio = 3.299,P= 0.036) and the TMJ with pain was also significant in TMJ with joint effusion (odds ratio = 4.413,P= 0.007). The gender and age showed no relationships with joint effusion.Conclusions:The results of this study made it clear that joint effusion was easier to occur in the TMJ of anterior disc displacement without reduction and in the TMJ with pain. Anterior disc displacement without reduction and TMJ pain would be related to the higher risk of joint effusion.
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