ABSTRACT
The purpose of this study was to compare retrospectively postoperative differences in maxillary stability after Le Fort I osteotomy and fixation with an unsintered hydroxyapatite (u-HA)/poly-l-lactic acid (PLLA) plate with or without self-setting α-tricalcium phosphate (Biopex(®)) as interpositional material. Subjects comprised 45 patients diagnosed with mandibular prognathism with maxillary retrognathism and mandibular prognathism with bimaxillary asymmetry. All patients underwent Le Fort I osteotomy and bilateral sagittal split ramus osteotomy with fixation by uHA/PLLA plates. Patients were divided into 4 groups consisting of 9 maxillary impaction cases with Biopex(®) (group 1) to fill the gap between the bone segments, 14 maxillary advancement cases with Biopex(®) (group 2), 8 maxillary impaction cases without Biopex(®) (group 3) and 14 maxillary advancement cases without Biopex(®) (group 4). Changes in cepahalometric parameters at time intervals (1, 3 and 12 months) between the groups were compared. Results showed that stability did not depend on the use or otherwise of Biopex(®).
Subject(s)
Absorbable Implants , Biocompatible Materials/therapeutic use , Bone Cements/therapeutic use , Bone Plates , Calcium Phosphates/therapeutic use , Durapatite/chemistry , Maxilla/pathology , Osteotomy, Le Fort/methods , Polyesters/chemistry , Adolescent , Adult , Biocompatible Materials/chemistry , Cephalometry/methods , Chondroitin Sulfates/therapeutic use , Facial Asymmetry/surgery , Female , Follow-Up Studies , Humans , Hydroxyapatites/therapeutic use , Incisor/pathology , Jaw Fixation Techniques/instrumentation , Male , Mandible/surgery , Maxilla/surgery , Middle Aged , Nasal Bone/pathology , Osteotomy, Le Fort/instrumentation , Osteotomy, Sagittal Split Ramus/methods , Prognathism/surgery , Retrospective Studies , Sella Turcica/pathology , Succinates/therapeutic use , Young AdultABSTRACT
The purpose of this study was to examine the changes in lip pressure before and after orthognathic surgery for skeletal class III patients. The subject groups were 32 female and 31 male patients diagnosed with mandibular prognathism and/or maxillary retrognathism who underwent orthognathic surgery. Control groups consisted of 20 women and 20 men with normal occlusion without dento-alveolar deformity. Maximum and minimum lip closing force was measured with Lip De Cum® for the control groups and subject groups preoperatively and 6 months postoperatively. The difference between the pre- and postoperative values of the groups was examined statistically. The maximum lip closing force in men was significantly larger than that in women in both the preoperative class III group (p=0.0330) and the control group (p=0.0097). The preoperative class III group was significantly smaller than the control group in maximum lip closing force in both men (p<0.0001) and women (p<0.0001). The postoperative maximum lip closing force was significantly larger than the preoperative value in both men (p=0.0037) and women (p=0.0273) in the Class III group. This study suggested that the maximum lip closing force increases after orthognathic surgery in Class III patients.
