Study on the lateral pterygoid muscle status after artificial temporomandibular joint replacement |
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| Affiliation: | 1. Department of Oral Surgery, Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, National Clinical Research Center of Stomatology, Shanghai, China;2. Department of Radiology, Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China;1. Department of Dentistry and Oral Surgery, Tokyo Metropolitan Tama Medical Center, Fuchu-shi, Tokyo, Japan;2. Department of Dentistry and Oral Surgery, Tokyo Metropolitan Bokutoh Hospital, Sumida-ku, Tokyo, Japan;3. Department of Stomatology, Tokyo Metropolitan Ohtsuka Hospital, Toshima-ku, Tokyo, Japan;1. Department of Radiotherapy and Medical Oncology, University Hospital for Tumours, University Hospital Center ‘Sisters of Mercy’, Zagreb, Croatia;2. University of Zagreb School of Medicine, Department of Maxillofacial Surgery, University Hospital Dubrava, Zagreb, Croatia;1. Department of Ophthalmology, Roski Eye Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA;2. Eyesthetica, Oculofacial and Cosmetic Surgery Associates, Los Angeles, CA, USA;1. Showa University Head and Neck Oncology Centre, Tokyo, Japan;2. Department of Oral and Maxillofacial Surgery, Division of Oral Oncology, Showa University, School of Dentistry, Tokyo, Japan;3. Department of Otorhinolaryngology, Showa University, School of Medicine, Tokyo, Japan |
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| Abstract: | The purpose of this study was to explore the status of the lateral pterygoid muscle (LPM) after detachment in artificial temporomandibular joint replacement (TJR) surgery. Patient clinical and computed tomography imaging data were collected before and after unilateral artificial TJR with LPM detachment. The volume of the LPM on the operated and unoperated sides was measured before and after surgery (at 1, 3, 6, 12 months) using ProPlan CMF 3.0 software. The volumes of the LPM on both sides, the patient’s mandibular movements, quality of life (QoL), and pain and diet scores (visual analogue scales) were evaluated and compared at the different follow-up stages. Ten patients were included in the study. After surgery, the volume of the operated LPM was significantly reduced to 60.78% at 3 months (P = 0.007), and gradually stabilized to 51.58% at 6 months (P = 0.025) and 54.68% at 1 year postoperative (P = 0.002). There were no significant LPM volume changes on the unoperated side (P = 0.67). Lateral movement of the operated joint was significantly reduced (P = 0.021) and correlated with the LPM volume change after surgical detachment (P = 0.042). The LPM shrank after detachment in the artificial TJR surgery and the muscle detachment affected the movement of the replaced joint. |
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| Keywords: | temporomandibular joint joint prosthesis pterygoid muscles X-ray computed tomography mandible movement |
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