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ABSTRACT
Clinical studies have shown a close association between temporomandibular joint hypermobility (TMJH) and temporomandibular disorders (TMD). While pathological change of the lateral pterygoid muscle (LPM) is one of the most emphasized in studies of TMD, there have been no detailed clinical reports of the LPM studies using magnetic resonance imaging (MRI) in TMJH. This study investigates structural and pathological alterations involving the LPM in patients with TMJH using MRI. A retrospective analysis was made of high-field MRI images from 98 patients with TMJH. LPMs of 143 joints were analyzed. In 110 joints (77%), hypertrophy, atrophy, and contracture were found in the superior belly and/or the inferior belly of the LPM. Pathological changes were more frequently found in the superior rather than the inferior belly of the LPM. In the cases with abnormalities in both bellies of the LPM, hypertrophy of the inferior belly was usually found combined with other changes of the SBLPM. The results of this study indicated that the pathological changes of the LPM or MRI are not in frequent in patients with symptomatic TMJH.
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Notes on contributors
Xiaojiang Yang
Dr. Xiaojiang Yang received his D.D.S. degree from the West China University of Medical Science in 1985 and received his master's degree as a specialist in maxillofacial surgery from the Chinese General Military Postgraduate Institute in 1990. He worked as a visiting scholar in the Department of Maxillofacial Surgery in Leuven University Hospital, Belgium, in 1991. Currently, he works as a researcher at the Institute of Dentistry, Oulu University, Finland.
Hannu Pernu
Dr. Hannu Pernu received his D.D.S. degree from the Institute of Dentistry, University of Turku, Finland in 1972 and his M.D. degree in 1979. He specialized in Oral Surgery in 1983 and in Maxillofacial Surgery in 1995 at the University of Oulu, Finland. Dr. Pernu is a senior lecturer and maxillofacial surgeon in the Department of Maxillofacial Surgery, Oulu University Central Hospital.
Juhani Pyhtinen
Dr. Juhani Pyhtinen received his M.D. degree in 1971 from the University of Oulu, Finland and his Ph.D. degree in 1977 from the same university. He specialized in radiology in 1978 and became a sub/specialist in neuroradiology in 1981. Dr. Pyhtinen is currently a professor in the Department of Neuroradiology, Oulu University Central Hospital.
Petri A. Tiilikainen
Dr. Petri A. Tiilikainen received his D.D.S. degree in 1999 from the Institute of Dentistry, University of Oulu, Finland. He is an assistant in the Department of Prosthodontics and Stomatognathic Physiology at the Institute of Dentistry, University of Oulu, Finland
Kyösti S. Oikarinen
Dr. Kyösti S. Oikarinen received his D.D.S. degree from the Institute of Dentistry, University of Turku, Finland in 1978 and his Ph.D. in 1987 from the University of Oulu, Finland. He received his D.M.D. degree in 1988 from Hamburg University, Germany. He is professor and head of the Department of Oral and Maxillofacial Surgery, Institute of Dentistry, University of Oulu and chief dentist in the Oral and Maxillofacial Department at Oulu University Hospital. Currently, he is a professor in the Oral and Maxillofacial Surgery Department in the Faculty of Dentistry, Kuwait University.
Aune M. Raustia
Dr. Aune M. Raustia received her D.D.S. degree in 1974 from the Institute of Dentistry, University of Helsinki, Finland, and her Ph.D. degree in 1986 from the University of Oulu, Finland. Currently, she is a professor in the Department of Prosthetic Dentistry and Stomatognathic Physiology at the Institute of Dentistry, and Dean of the Institute of Dentistry, University of Oulu, Finland.