Osseous alterations in the condylar head after unilateral surgical directional change in rabbit mandibular condyles: Preliminary study |
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| Institution: | 1. Department of Clinical Sciences, Faculty of Veterinary Medicine, Urmia University, Nazloo Road, Urmia 57153 1177, Iran;2. Department of Clinical Sciences, Faculty of Veterinary Medicine, Urmia Branch, Islamic Azad University, Urmia, Iran;3. Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan S7N 5B4, Canada;1. Department of Otolaryngology, Head and Neck Surgery, Cardinal Tien Hospital, School of Medicine, Fu-Jen Catholic University, Taipei, Taiwan;2. Department of Pathology, Cardinal Tien Hospital, School of Medicine, Fu-Jen Catholic University, Taipei, Taiwan;3. Department of Otolaryngology, Head and Neck Surgery, National Taiwan University Hospital, School of Medicine, National Taiwan University, Taipei, Taiwan;1. Department of Oral and Maxillofacial Radiology, BK21, and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea;2. Department of Biomedical Radiation Sciences, Graduate School of Convergence Science and Technology, Seoul National University, South Korea;1. Department of Oral and Maxillofacial Surgery/Oral Pathology, VU University Medical Center/Academic Centre for Dentistry Amsterdam (ACTA), P.O. Box 7057, Amsterdam, 1007 MB, Netherlands;2. Department of Oral and Maxillofacial Surgery, Bristol Dental Hospital, Lower Maudlin Street, Bristol, BS2 1LY, UK |
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| Abstract: | The purpose of this study was to investigate bony changes in the mandibular condyle when the surface not normally subjected to masticatory forces was subjected to functional loading using a unilateral surgical experiment. Fifteen male New Zealand white rabbits, divided into two groups, were used. Oblique vertical body osteotomies of the mandible and counterclockwise rotation (CCWR) of the proximal segment (PS) six with 1 mm (group I), six with 3 mm (group II)] were performed on the right side. Osseous changes of condyles were analyzed using micro-computed tomography and histological evaluation four weeks postoperatively. The comparison was performed between condyles on the right and left sides. Since the left condyle (control) might be affected by the operation on the right side, the results were also compared with the healthy control (group III, n = 3, 6 condyles). CCWR of the PS led to osteoporotic changes of the condyle including significantly reduced bone volume and bone mineral density (p < 0.05), thin and small number of trabeculae (p < 0.05). In addition, thinning of condylar cartilage and reduced density of cartilaginous cells were observed. However, these changes were not affected by the amount of CCWR of the PS. |
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| Keywords: | Temporomandibular joint Rabbit Counterclockwise rotation of the proximal segment Micro-computed tomography |
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