Accuracy of perioperative mandibular positions in orthognathic surgery |
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| Institution: | 1. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, University of Sao Paulo – USP, Sao Paulo, Brazil;2. Post-Graduate Department, Faculty of Dentistry, University of Cuiabá – UNIC, Brazil;3. Department of Statistics, Institute of Exact and Earth Sciences, Federal University of Mato Grosso – UFMT, Brazil;4. Department of Oral and Maxillofacial Surgery, University of Illinois, Chicago, IL, USA;1. Clinical Assistant Professor, Department of Oral and Maxillofacial Surgery, University of Illinois at Chicago, Chicago, IL;2. Professor and Head, Department of Oral and Maxillofacial Surgery, University of Illinois at Chicago, Chicago, IL;3. Associate Professor, Associate Program Director, Director of Research, Department of Oral and Maxillofacial Surgery, University of Illinois at Chicago, Chicago, IL;1. Assistant Professor, Department of Oral and Maxillofacial Surgery, and Member, Cancer Center, University of Illinois at Chicago, Chicago, IL;2. Clinical Assistant Professor, Department of Oral Medicine and Diagnostic Sciences, University of Illinois at Chicago, Chicago, IL;3. Chief, Oral and Maxillofacial Surgery, Feinberg School of Medicine, Northwestern Memorial Hospital, Chicago, IL;4. Professor and Head, Department of Oral and Maxillofacial Surgery, University of Illinois at Chicago, Chicago, IL;1. Department of Oral and Maxillofacial Surgery, University of Nebraska Medical Center, Omaha, NE, USA;2. Department of Oral and Maxillofacial Surgery, University of Illinois, Chicago, IL, USA;3. Department of Oral and Maxillofacial Surgery, University of Sao Paulo – USP, Sao Paulo, Brazil;4. Department of Oral and Maxillofacial Surgery, Karolinska University Hospital, Stockholm, Sweden;1. Post-Graduation Department, Faculty of Dentistry, Universidade de Cuiabá – UNIC, Brazil;2. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, University of Sao Paulo – USP, Brazil;3. Department of Oral and Maxillofacial Surgery, University of Illinois, Chicago, IL, USA;1. Professor, Department of Oral and Maxillofacial Surgery, Dental Research Center, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran;2. Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran;3. Associate Professor, Department of Prosthodontics, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran;4. Assistant Professor, Department of Prosthodontics, Dental Research Center, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran;6. Assistant Professor, Department of Oral and Maxillofacial Surgery, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran;5. Associate Professor, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran |
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| Abstract: | Mandibular position is an important parameter used for the diagnosis of dentofacial deformities, as well as for orthognathic surgery planning and execution. Centric relation (anterior and superior relationship of the mandibular condyles interposed by the thinnest portion of their disks against the articular eminencies), centric occlusion (when lower teeth contact upper teeth at centric relation), and maximal intercuspation (complete interdigitation of lower and upper teeth) are not often addressed as factors that influence the results of orthognathic surgery, although these relationships are critical to ensure accuracy during the surgery. The present study assessed occlusal measurements taken before and after the induction of general anaesthesia from consecutive orthognathic surgery subjects. The variables assessed included the differences between these occlusal measurements, patient age, gender, type of deformity, and type of proposed orthognathic surgical procedure. The results demonstrated statistically significant differences for mandibular retrusion from maximal intercuspation to centric occlusion position, whereas the mandible appeared not to change significantly from centric occlusion after the induction of general anaesthesia. Patient age and the type of deformity appeared to influence the results. While in most instances centric occlusion can be adequately reproduced under general anaesthesia, for some specific orthognathic cases more accurate results might be obtained if the mandible-first sequence is used. |
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| Keywords: | dental occlusion centric dental occlusion dentofacial deformities orthognathic surgery |
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