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Mandibular osteotomy

Jeffrey C Posnick, Elbert Choi, Anish Chavda
PURPOSE: Frequency estimates of surgical site infection (SSI) after orthognathic surgery vary considerably. The purpose of this study was to determine the incidence and site of SSIs and associated risk factors after bimaxillary orthognathic, osseous genioplasty, and intranasal surgery. MATERIALS AND METHODS: The authors executed a retrospective cohort study of patients with a bimaxillary developmental dentofacial deformity (DFD) and symptomatic chronic obstructive nasal breathing...
September 20, 2016: Journal of Oral and Maxillofacial Surgery
Jeong Joon Han, Jong-Hyon Chong, Sun-Youl Ryu, Hee-Kyun Oh, Hong-Ju Park, Seunggon Jung, Min-Suk Kook
OBJECTIVES: This study aimed to compare preoperatively predicted rotational relapse with actual post-treatment mandibular position after mandibular setback surgery via the surgery-first approach and to evaluate the effect of the increase of vertical dimension (VD) on surgical occlusion and the amount of mandibular setback on postoperative mandibular positional changes. STUDY DESIGN: Twenty-nine patients who underwent bilateral sagittal split ramus osteotomy for mandibular prognathism were evaluated by using lateral cephalograms, which had been obtained preoperatively, immediately postoperatively, and immediately after debonding...
July 30, 2016: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Yunfeng Li, Zhiai Hu, Bin Ye, Yao Liu, Xiaochun Ren, Songsong Zhu
PURPOSE: Orthognathic surgery is an efficient procedure for cosmetic and functional aims. However, when functional improvement is achieved by mandibular or maxillary operations, additional esthetic corrections may be imperative for some patients. This study aims to introduce our primary practice of simultaneous facial bone contouring and orthognathic surgery for esthetic reasons. PATIENTS AND METHODS: Ten patients with dentofacial deformities as well as a prominent angle, asymmetric deformities, or a high zygoma and zygomatic arch were recruited from West China Hospital of Stomatology, Sichuan University (Chengdu, China), between January 1, 2014, and July 31, 2015...
August 31, 2016: Journal of Oral and Maxillofacial Surgery
Hye-Rim Ann, Young-Soo Jung, Kee-Joon Lee, Hyoung-Seon Baik
OBJECTIVE: The aim of this study was to evaluate the skeletal and dental changes after intraoral vertical ramus osteotomy (IVRO) with and without presurgical orthodontics by using cone-beam computed tomography (CBCT). METHODS: This retrospective cohort study included 24 patients (mean age, 22.1 years) with skeletal Class III malocclusion who underwent bimaxillary surgery with IVRO. The patients were divided into the preorthodontic orthognathic surgery (POGS) group (n = 12) and conventional surgery (CS) group (n = 12)...
September 2016: Korean Journal of Orthodontics
Jeffrey C Posnick, Jorge Perez, Anish Chavda
PURPOSE: The purpose of this study was to assess for the maintenance of a corrected occlusion and ongoing mandibular growth in a group of patients younger than 26 years with hemimandibular elongation (HME) who underwent bimaxillary orthognathic reconstruction. MATERIALS AND METHODS: We conducted a retrospective cohort study of HME patients operated on by a single surgeon at 1 institution between 1999 and 2013. At a minimum, all patients underwent Le Fort I and bilateral sagittal ramus osteotomies...
August 24, 2016: Journal of Oral and Maxillofacial Surgery
Z Miao, X-D Wang, L-X Mao, Y-H Xia, L-J Yuan, M Cai, J-Q Liu, B Wang, X Yang, L Zhu, H-B Yu, B Fang
The purpose of this study was to clarify the correlation between pre-treatment anterior disc displacement and mandibular stability after orthognathic and orthodontic treatment among patients with a skeletal class II malocclusion and without pre-treatment condylar resorption. Thirty-seven patients were included (7 male, 30 female). The mean length of follow-up was 6.76±3.06 years. Patients with condylar resorption before treatment were excluded. Magnetic resonance images and lateral cephalometric radiographs were taken before treatment (T0), after treatment (T1), and at follow-up (T2)...
September 13, 2016: International Journal of Oral and Maxillofacial Surgery
A Moroi, K Yoshizawa, R Iguchi, A Kosaka, H Ikawa, Y Saida, A Hotta, T Tsutsui, K Ueki
The purpose of this study was to compare computed tomography (CT) Hounsfield unit values of bone fragment gaps after sagittal split ramus osteotomy (SSRO) in patients with and without asymmetry, and to evaluate differences between the deviated and non-deviated sides in asymmetric patients. Thirty-two patients who underwent a bilateral SSRO were included in this retrospective study. Patients were divided into symmetric and asymmetric groups by cephalometric analysis. CT values of the bone fragment gap were measured at 1 week and at 1 year after surgery...
September 12, 2016: International Journal of Oral and Maxillofacial Surgery
Han Guo Wang, Ning Xu, Qing Yu
The separate distolingual (DL) roots of three-rooted mandibular first molars are thought to be too difficult for performing apical surgery. This article represents microsurgical treatment of a three-rooted mandibular first molar with a separate DL root. The procedure includes incision and flap retraction, osteotomy, apicoectomy, retropreparation and retrofilling of the root canal, using micro instruments, ultrasonic retrotips and mineral trioxide aggregate (MTA) under a dental operating microscope. Two mm in length of apical root resection, 2 mm in depth of root canal retropreparation with a personalised ultrasonic retrotip, and 2 mm in length of retrofilling with MTA are the key points for accomplishment of apical surgery on separate DL roots...
2016: Chinese Journal of Dental Research
Yao Liu, Wen Du, Jing Hu, Chuhang Liao, Wei Fei, En Luo
OBJECTIVE: With the inclusion criteria of patients confirmed and the therapeutic effects and stability evaluated, this article presents the clinical value of bimaxillary orthognathic surgery without bone graft of maxillofacial asymmetric deformities in patients treated for unilateral temporomandibular joint (TMJ) ankylosis. STUDY DESIGN: From 2008 to 2012, 12 patients with dentomaxillofacial asymmetric deformities secondary to unilateral TMJ ankylosis who had undergone TMJ reconstruction as the primary surgery were included in the study...
July 14, 2016: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Franco Carlino, Giuseppe Pantaleo, Fabio Ciuffolo, Pier Paolo Claudio, Antonio Cortese
INTRODUCTION: A surgical technique to widen the mandible is the mandibular midline distraction: the most common indications for mandibular midline distraction are severe mandibular anterior crowding, severe mandibular transverse deficiency, uni- or bilateral crossbite, impacted anterior teeth with inadequate space, and tipped teeth. Commonly used distraction devices can be divided into 2 systems: bone-borne distraction system appliance, dental-borne distraction systems. Each system has peculiar advantages, disadvantages, and different indications...
September 2016: Journal of Craniofacial Surgery
Siamak Hemmatpour, Fatemeh Kadkhodaei Oliadarani, Ali Hasani, Vahid Rakhshan
INTRODUCTION: The aim of this before-after clinical trial was to evaluate nasolabial soft tissue changes in the frontal plane after bimaxillary surgery. METHODS: A total of 20 skeletal Class III Iranian patients needing bimaxillary Le Fort I osteotomy plus mandibular setback surgery were enrolled in this trial. Patients underwent 4.02 ± 1.02 mm of maxillary advancement (Le Fort I osteotomy, 4.33 ± 1.21 mm in men, 3.81 ± 0.86 mm in women) and 7.13 ± 1...
August 31, 2016: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
F X Wong, A A Heggie, J M Shand, P M Schneider
The stability of surgical maxillary advancement in a consecutive series of patients with cleft lip and palate who underwent Le Fort I osteotomy with and without simultaneous mandibular setback surgery was evaluated. Preoperative, postoperative, and follow-up lateral cephalograms of 21 patients were assessed to compare differences in surgical movement and postoperative relapse between two groups: those who underwent maxillary surgery alone and those who underwent bimaxillary surgery. Differences in the number of patients who experienced relapse of <2mm, 2-4mm, and >4mm between the groups were also compared...
August 26, 2016: International Journal of Oral and Maxillofacial Surgery
Han Lin, Ping Zhu, Qiuping Lin, Xiaoqiong Huang, Yue Xu, Xiaoping Yang
PURPOSE: Facial asymmetry often persists even after mandibular deviation corrected by the bilateral sagittal split ramus osteotomy (BSSRO) operation, since the reference facial sagittal plane for the asymmetry analysis is usually set up before the mandibular menton (Me) point correction. Our aim is to develop a predictive and quantitative method to assess the true asymmetry of the mandible after a midline correction performed by a virtual BSSRO, and to verify its availability by evaluation of the post-surgical improvement...
2016: PloS One
Yong-Dae Kwon, Ahran Pae
A female patient in her mid-seventies was referred to our department for the removal of a displaced implant within the right posterior mandible. A trapezoidal window was made using a piezoelectric device. The implant was extracted, and the osteotomized window was replaced without fixation. Caution should be exercised during implant placement in patients with osteoporosis because of the risk of implant displacement. Displaced implants can be easily retrieved by piezoelectric trapezoidal osteotomy.
October 2016: Implant Dentistry
Girish B Giraddi, Kirti Arora, A J Sai Anusha
AIMS: The aims of the study were to evaluate the efficacy of simultaneous interpositional arthroplasty with distraction osteogenesis (DO) as a single procedure and to give the patient acceptable functional rehabilitation with correction of the gross facial asymmetry. MATERIALS AND METHODS: Nine patients of temporomandibular joint (TMJ) ankylosis with micrognathia were treated with interpositional arthroplasty and simultaneous DO and followed for a period of minimum 3 years...
January 2016: Annals of Maxillofacial Surgery
Ram Sarup Singh, Navpreet Kaur, Vikas Rana, John F Kennedy
Tissue engineering is a recently emerging line of act which assists the regeneration of damaged tissues, unable to self-repair themselves and in turn, enhances the natural healing potential of patients. The repair of injured tissue can be induced with the help of some artificially created polymer scaffolds for successful tissue regeneration. The pullulan composite scaffolds can be used to enhance the proliferation and differentiation of cells for tissue regeneration. The unique pattern of pullulan with α-(1→4) and α-(1→6) linkages along with the presence of nine hydroxyl groups on its surface, endows the polymer with distinctive physical features required for tissue engineering...
November 20, 2016: Carbohydrate Polymers
Tongyue Wang, Jeong Joon Han, Hee-Kyun Oh, Hong-Ju Park, Seunggon Jung, Min-Suk Kook
PURPOSE: To examine and compare the 3-dimensional (3D) postoperative changes of the condylar position after mandibular setback surgery using the orthodontics-first approach (OFA) and surgery-first approach (SFA). MATERIALS AND METHODS: This retrospective cohort study included patients who had undergone bilateral sagittal split ramus osteotomy for mandibular prognathism using OFA or SFA. Computed tomography images were obtained and analyzed preoperatively (T0), postoperatively (T1), and at the 6-month follow-up visit (T2)...
July 26, 2016: Journal of Oral and Maxillofacial Surgery
E Schilbred Eriksen, P J Wisth, S Løes, K Moen
The purpose of this study was to elucidate the long-term skeletal and dental stability after combined orthodontic and orthognathic surgical treatment of mandibular prognathism with the intraoral vertical ramus osteotomy (IVRO) as the surgical technique followed by 6 weeks of intermaxillary fixation (IMF). Thirty-six patients were included in the study. Mean age at surgery was 21.6 years. Lateral cephalograms and study casts obtained before the start of treatment (T0), and 8 weeks (T1), 1 year (T2), and 12.5 years (T3) after the operation were evaluated...
August 18, 2016: International Journal of Oral and Maxillofacial Surgery
Zhi Dai, Min Hou, Wen Ma, Da-Li Song, Chun-Xiang Zhang, Wei-Yuan Zhou
PURPOSE: To evaluate transverse displacement of the proximal segment after bilateral sagittal split ramus osteotomy (BSSO) advancement with different lingual split patterns and advancement amounts and to determine the influential factors related to mandibular width. MATERIALS AND METHODS: A 3-dimensional finite element model of the mandible including the temporomandibular joint was created for a presurgical simulation and for BSSO with lingual split patterns I (T1; Hunsuck split) and II (T2; Obwegeser split)...
July 25, 2016: Journal of Oral and Maxillofacial Surgery
Yawei Li, Xiaomei Sun, Li Teng, Jiajie Xu, Jianjian Lu, Bo Ding, Chao Zhang, Fang Xie, Xuejian Sun
The purpose of this study was to determine the changes in hard tissues, soft tissues, and teeth after bilateral sagittal split ramus osteotomy and orthodontic treatment for the treatment of mandibular protrusion. Cephalometric analysis was used to evaluate the aesthetic effects and occlusal relationships obtained. The subjects included 11 women and 9 men (aged 18-27 years; average, 20 years) with mandibular protrusion who underwent bilateral sagittal split ramus osteotomy. Based on a preoperative computer-aided manufacturing/design-assisted, model surgical design and an occlusal guide plate, new occlusal relationships were established for the patients...
August 17, 2016: Journal of Craniofacial Surgery
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