Plate Removal in Orthognathic Surgery
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The anonymised source data of my study 'Analysis of the Incidence of Individualized Treatment Factors that Predispose to Plate Removal in Orthognathic Surgery'
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We conducted a retrospective study of 146 medical records of patients undergoing orthognathic surgery from January 2015 to December 2018 and belonging to the Oral and Maxilo Surgical Division of the Ophir Loyola Hospital. The sample included subjects treated by the same squad for the skeletal deformity correction. Those who required second intervention to removal of osteosynthesis material (RMO) were referred and the procedures were performed by the same surgeons. Patients with incomplete records, patients with cleft lips and palates, post-traumatic deformities, maxillofacial tumors or those who did not complete postoperative follow-up for at least eight months were excluded. In all, 123 medical records were analyzed. The need for RMO comprised the result variable. The surgical movements were analyzed as the primary predictor variable and the skeletal deformity involved in malocclusion, sex and age formed other independent variables. The predictor variables were grouped into demographic and clinical. Sex (0 - Male or 1 - Female) and age, encoded in years by continuous windows (0 - 15 to 20 years; 1 - 21 to 30; 2 - 31-40; 3 - 41 to 47) comprised the demographic category. The clinical variables were formed by the surgical movement performed, Dentofacial deformity and the causes that resulted in complications were separated into categories of infection (in the presence of fistula, dehiscence and unsatisfactory healing with granulation tissue) and structural alteration of the fixation (defined by the laxity of screws or plate fracture). Dentofacial deformities were categorized into: Maxillomandibular asymmetry (AM), Short Face (SF) (Vertical maxillary deficiency; low occlusal plane), Long Face (LF) (Vertical maxillary excess; increased occlusal plane), Class II (CII ) (Antero-posterior mandible deficiency; antero-posterior excess of the maxilla) and Class III (CIII) (antero-posterior excess of the mandible; antero-posterior deficiency of the maxilla). These categories were defined based on the etiology of the deformity, through an individualized subjective examination, involving clinical evaluation and 3D diagnosis. Surgical movements were defined as: Asymmetry Correction (CAM), Counterclockwise Rotation (CCR) and Clockwise Rotation (CR) (when there was a change greater than 2 degrees from the occlusal plane), Maxilla and Mandible forward (MxMdF) and Maxilla forward and Mandible back (MxFMdB) A binary variable identified the need for RMO (Yes or No) and understood the result variable.