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Abstract
The purpose of this study was to clarify the presence of pain and a correlation between pain and characteristics of signal intensity of mandibular bone marrow in temporomandibular joints (TMJ) with osteoarthritis (OA). A total of 196 joints in 98 patients with TMJ disorders were examined using magnetic resonance imaging (MRI). A pain score and signal intensity on mandibular bone marrow were analyzed in the TMJ with OA. TMJ with OA showed a higher degree of pain compared to those without (p<0.05). During opening, the joints in the higher signal intensity group showed a significantly higher degree of pain compared to the joints in the lower signal intensity group in those with OA on proton density weighted images (p<0.05). It was concluded that TMJ with osteoarthritis is related to pain and that a symptomatic osteoarthritic TMJ can accompany bone marrow changes in the condyle, showing an increased signal on proton density weighted images.
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Notes on contributors
Aya Yajima
Dr. Aya Yajimareceived her D.D.S. degree from Tokyo Dental College, Chiba, Japan in 2005. She is a graduate school student of oral and maxillofacial radiology at the same college.
Tsukasa Sano
Dr. Tsukasa Sano received his D.D.S. degree from Showa University, Tokyo, Japan in 1987 and his Ph.D. degree from the same university in 1991. He was a visiting assistant professor in the Department of Radiology, University of Rochester Medical Center, Rochester, New York and currently is a professor and the chairman of oral and maxillofacial radiology, Tokyo Dental College, Chiba, Japan.
Mika Otonari-Yamamoto
Dr. Mika Otonari-Yamamoto received her D.D.S. degree from Nagasaki University, Nagasaki, Japan in 1995 and her Ph.D. degree from Showa University, Tokyo, Japan in 2003. She was a research fellow in the Department of Radiology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston and is now an assistant professor of oral and maxillofacial radiology, Tokyo Dental College, Chiba, Japan
Takamichi Otonari
Dr. Takamichi Otonari received his D.D.S. degree from Tsurumi University, Yokohama, Japan in 1998 and his Ph.D. degree from Tokyo Dental College in 2006. He is an assistant professor of oral and maxillofacial radiology, Tokyo Dental College, Chiba, Japan.
Mai Ohkubo
Dr. Mai Ohkubo received her D.D.S. degree from Tokyo Dental College, Chiba, Japan in 1999 and her Ph.D. degree from Showa University, Tokyo, Japan in 2003. She is an assistant professor of oral and maxillofacial radiology, Tokyo Dental College, Chiba, Japan.
Takuya Harada
Dr. Takuya Harada received his D.D.S. degree from Tokyo Dental College, Chiba, Japan in 1993 and his Ph.D. degree from the same college in 1997. He is an assistant professor of oral and maxillofacial radiology, Tokyo Dental College, Chiba, Japan.
Mamoru Wakoh
Dr. Mamoru Wakoh received his D.D.S. degree from Tokyo Dental College, Chiba, Japan in 1984 and his Ph.D. degree from the same college in 1988. He was a visiting professor in the Division of Radiology and Imaging Sciences, School of Dentistry, University of Louisville, Louisville, Kentucky. He is currently an associate professor of oral and maxillofacial radiology, Tokyo Dental College, Chiba, Japan.