OBJECTIVES: To test the hypothesis that the morphology of the articular eminence of the TMJ is a predisposing factor for disc displacement. METHODS: MR images of 220 TM joints in 151 patients were studied: 47 joints had no disk displacement (NDD), 81 joints disc displacement with reduction (DDWR) and 92 joints disc displacement without reduction (DDWOR). The shape of the articular eminence of the TMJ was classified into four types, box, sigmoid, flattened and deformed. The prevalence of the box and flattened forms in the three groups of joints was compared. RESULTS: There was no statistically significant difference in the prevalence of the box form between the joints with NDD, DDWR, and DDWOR. On the other hand, the prevalence of the flattened-type was statistically lower in the joints with DDWR (goodness test of fit for chi 2, P < 0.05). CONCLUSIONS: It appears that disc displacement is less likely to be found in joints with a shallow articular eminence.
OBJECTIVES: To test the hypothesis that the morphology of the articular eminence of the TMJ is a predisposing factor for disc displacement. METHODS: MR images of 220 TM joints in 151 patients were studied: 47 joints had no disk displacement (NDD), 81 joints disc displacement with reduction (DDWR) and 92 joints disc displacement without reduction (DDWOR). The shape of the articular eminence of the TMJ was classified into four types, box, sigmoid, flattened and deformed. The prevalence of the box and flattened forms in the three groups of joints was compared. RESULTS: There was no statistically significant difference in the prevalence of the box form between the joints with NDD, DDWR, and DDWOR. On the other hand, the prevalence of the flattened-type was statistically lower in the joints with DDWR (goodness test of fit for chi 2, P < 0.05). CONCLUSIONS: It appears that disc displacement is less likely to be found in joints with a shallow articular eminence.
Authors: J F G de Farias; S L S Melo; P M Bento; L S A F Oliveira; P S F Campos; D P de Melo Journal: Dentomaxillofac Radiol Date: 2015-03-25 Impact factor: 2.419
Authors: Izabella Nascimento Falcão; Maria Beatriz Carrazzone Cal Alonso; Lucas Hian da Silva; Sérgio Lúcio Pereira de Castro Lopes; Lívia Pichi Comar; André Luiz Ferreira Costa Journal: Int J Dent Date: 2017-06-21