Internal derangement as a predictor of provoked pain on mouth opening: A magnetic resonance imaging study

• Published in: Imaging science in dentistry Vol. 47; no. 4; pp. 219 - 226
• Main Authors: Koh, Kwang-Joon, Park, Ha-Na, Kim, Kyoung-A
• Format: Journal Article
• Language: English
• Published: Korea (South) Korean Academy of Oral and Maxillofacial Radiology 01.12.2017; 대한영상치의학회
• Subjects: Original; 치의학; Magnetic Resonance Imaging; Pain; Temporomandibular Joint
• ISSN: 2233-7822; 2233-7830
• DOI: 10.5624/isd.2017.47.4.219

This study investigated the relationship between pain and internal derangement in temporomandibular disorder (TMD) patients using magnetic resonance imaging (MRI). This study analyzed 356 TMD patients (712 temporomandibular joints [TMJs]). The inclusion criteria were the presence of spontaneous or provoked pain on one or both TMJs and having undergone MRI. The patients with provoked pain were divided into 3 groups: pain on palpation, pain on mouth opening, and pain on mastication. MRI was performed using a 1.5-T scanner. T1- and T2-weighted parasagittal and paracoronal images were obtained. According to the findings on the T1-weighted images, another 3 groups were created based on internal derangement: normal, disc displacement with reduction, and disc displacement without reduction. The MRI findings were independently interpreted by 2 experienced oral and maxillofacial radiologists at 2 different times. Statistical analysis was performed by the chi-square test using SPSS (version 12.0; SPSS Inc., Chicago, IL, USA). Provoked pain on mouth opening was found to be correlated with internal derangement in TMD patients ( <.05). However, spontaneous pain and provoked pain on palpation or mastication were not associated with internal derangement ( >.05). These results suggest that internal derangement was a significant predictor of provoked pain on mouth opening.