Association between maximum mouth opening and area of bony fusion in simulated temporomandibular joint bony ankylosis |
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| Affiliation: | 1. State Key Laboratory of Military Stomatology and National Clinical Research Centre for Oral Diseases and Shaanxi Clinical Research Centre for Oral Diseases, Department of Oral Surgery, School of Stomatology, The Fourth Military Medical University, Xi’an, China;2. Department of Stomatology, Xi’an Medical University, Xi’an, China;3. Department of Endodontics and Restorative Dentistry, School of Stomatology, Tianjin Medical University, Tianjin, China;4. Department of Health Statistics, School of Preventive Medicine, The Fourth Military, Medical University, Xi’an, China;1. Department of Otorhinolaryngology–Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea;2. Department of Otorhinolaryngology–Head and Neck Surgery, Ilsong Memorial Institute of Head and Neck Cancer, Hallym University, College of Medicine, Seoul, Republic of Korea;1. Department of Veteran Affairs, Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA;2. Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA;3. Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA;4. Department of Oral and Maxillofacial Surgery, Medical University of South Carolina, Charleston, SC, USA;5. University of Michigan School of Dentistry, Ann Arbor, MI, USA;6. Private Practice, Burlington, MA;7. Dow International Medical College, Dow University of Health Sciences;8. Private Practice, Olympia, Washington;9. Department of Orofacial Pain, College of Dentistry, University of Kentucky, Lexington, KY, USA;10. Ralph H. Johnson VA Medical Center, Charleston, SC, USA;1. Institute of Maxillofacial Surgery, Teknon Medical Centre Barcelona, Barcelona, Spain;2. Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Barcelona, Spain;1. Department of Oral and Maxillofacial Surgery, Key Laboratory of Oral Clinical Medicine, the Affiliated Hospital of Qingdao University, Qingdao, Shandong, China;2. Xiangya School of Stomatology, Central South University, Changsha, Hunan, China;3. Department of Research, the Affiliated Hospital of Qingdao University, Qingdao, Shandong, China;1. Institute of Information Science, Beijing Jiaotong University, Beijing Key Laboratory of Advanced Information Science and Network, Beijing 100044, China;2. School of Electronic Information Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China;1. Department of Diagnosis and Surgery, Division of Oral and Maxillofacial Surgery, São Paulo State University (UNESP), School of Dentistry, Araraquara, Brazil;2. Private Clinic, Santos, São Paulo State, Brazil |
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| Abstract: | The aim of this study was to investigate the quantitative association between active/passive maximum mouth opening (AMMO/PMMO) and the severity of simulated temporomandibular joint (TMJ) bony ankylosis. Twenty-eight male sheep were divided randomly and equally into surgical and control groups. Surgical group animals underwent bilateral TMJ osteotomy during which left lateral pterygoid muscle function was blocked. Control animals did not undergo surgery. Body weight, AMMO/PMMO, and TMJ morphological features were evaluated preoperatively and at 12 and 24 weeks post-surgery. In the surgical group, only the right TMJ complexes with maintained lateral pterygoid muscle function developed TMJ bony ankylosis. The AMMO/PMMO and end-feel distance in the surgical group were significantly lower than those in the control group (P < 0.001, both) at 12 and 24 weeks post-surgery. Moreover, AMMO (r = −0.940 and −0.952, P < 0.001, both) and PMMO (r = −0.944 and −0.953, P < 0.001, both) were negatively correlated with the area (mm2) of bony fusion post-surgery. These findings may be useful for the clinical treatment of early mandibular condyle fracture, with the use of occlusal pads/open-mouth plates to relax the lateral pterygoid muscle and block its function. When bony ankylosis developed in the TMJ, the greater the area of bony fusion, the more limited were AMMO/PMMO. |
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| Keywords: | bony fusion area maximum mouth opening temporomandibular joint ankylosis computed tomography lateral pterygoid muscle |
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