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Mandibular osteotomy

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https://www.readbyqxmd.com/read/29336932/orthognathic-surgery-in-melnick-needles-syndrome-a-review-of-the-literature-and-report-of-two-siblings
#1
REVIEW
J E O'Connell, B Bourke, G J Kearns
Melnick-Needles syndrome (MNS) is a rare congenital X-linked dominant skeletal dysplasia, characterized by exophthalmos, a prominent forehead, and mandibular hypoplasia and retrognathism. Dental features may include anodontia, hypodontia, or oligodontia. Increased collagen content, unpredictable collagen synthesis, and abnormal bony architecture have raised concerns regarding bone splitting intraoperatively and bone healing postoperatively. This report describes the cases of two sisters with MNS, who successfully underwent orthognathic surgery consisting of bilateral mandibular ramus osteotomies combined with advancement genioplasty and iliac crest bone grafting, to correct the classical MNS facial deformity of mandibular retrognathia...
January 11, 2018: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29303854/wedge-osteotomy-for-correction-of-chin-asymmetry
#2
Pedro Jorge Cavalcante Costa, Johnny Holanda de Gauw, José Zenou Costa Filho
Chin deviation is generally the visible reflex of a mandibular asymmetry. The difficulty in obtaining a symmetrical result exists, but it can be minimized with the appropriate surgical technique. This article reports the mentoplasty technique with wedge osteotomy performed in an individual with a right-sided chin deviation. Three osteotomies were performed vertically and equidistantly, forming a bone wedge on the contralateral side of the deviation. Horizontal repositioning associated with the rotation caused by the vertical impaction of the chin after bone wedge removal was effective in solving esthetic problems of facial asymmetry, meeting the patient's main complaint...
January 4, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29295797/comparative-study-of-biomechanical-stability-of-resorbable-and-titanium-fixation-systems-after-sagittal-split-ramus-osteotomy-with-a-novel-designed-in-vitro-testing-unit
#3
Murat Ulu, Emrah Soylu, Seyfi Kelebek, Serkan Dikici, Hakan Oflaz
INTRODUCTION: Sagittal split ramus osteotomy (SSRO) is one of the most popular surgical procedures for correction of mandibular deformities. Several clinical and biomechanical studies exist in the literature which, comparing the stability of different osteosynthesis materials and techniques, were performed using two or three-point biomechanical test models. The aim of this study was to compare the stability of biodegradable and titanium materials for SSRO on one-piece polyurethane mandible samples which were fixed in a novel designed 6-point testing unit...
December 13, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29283940/evaluation-of-intersegmental-displacement-after-mandibular-setback-split-ramus-osteotomy-using-modified-l-shaped-monocortical-plate-cone-beam-computed-tomography-superimposition
#4
Dae Seok Hwang, Hyeong Geun Lee, Sang Hun Shin, Uk Kyu Kim
PURPOSE: The purpose of the current study is to compare intersegmental displacements after mandibular setback sagittal split ramus osteotomy (SSRO) using 4 types of osteosynthesis methods. PATIENTS AND METHODS: This is a retrospective study of 53 subjects who presented underwent bilateral setback SSRO at Pusan National University Hospital from January 2009 to December 2013. The subjects were divided into 4 groups according to the osteosynthesis method applied: group A-modified L-type monocortical plate; B-conventional miniplate; group C-bicortical screws; group D-metal and absorbable screws...
December 27, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29280876/strategic-considerations-for-effective-sagittal-resection-of-the-mandible-to-achieve-a-slim-and-attractive-jawline
#5
Sanghoon Park, Tae Sung Lee
BACKGROUND: Sagittal resection of the mandible has been widely used to reduce the width of the lower face and is usually carried out in combination with a mandibular contouring procedure. However, the surgical outcomes of this procedure are unclear because sagittal resection is rarely performed as a single procedure. The authors clarify misunderstandings regarding this procedure and introduce an improved strategic approach for sagittal resection of the mandible. METHODS: Under general anesthesia, mandible contouring was performed first with a curved osteotomy, followed by sagittal resection of the outer cortex of mandible...
January 2018: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29249412/comprehensive-analysis-of-soft-tissue-changes-in-response-to-orthognathic-surgery-mandibular-versus-bimaxillary-advancement
#6
A Almukhtar, B Khambay, X Ju, A Ayoub
This study was performed to compare soft tissue changes in response to mandibular and bimaxillary advancement osteotomy. Preoperative and postoperative cone beam computed tomography scans of 24 cases were analysed: 12 underwent bimaxillary advancement and 12 underwent mandibular advancement. The skeletal surgical movements were measured and soft tissue changes were displayed on a three-dimensional colour map. The intensity and shade of the colour indicated the magnitude and direction of the changes. In the bimaxillary advancement group, maxillary advancement was 5...
December 14, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29224810/utilization-of-a-pre-bent-plate-positioning-surgical-guide-system-in-precise-mandibular-reconstruction-with-a-free-fibula-flap
#7
Tingwei Bao, Jianfeng He, Changyang Yu, Wenquan Zhao, Yi Lin, Huiming Wang, Jianhua Liu, Huiyong Zhu
OBJECTIVES: We evaluated the effects of three-dimensional virtual planning and the use of a plate-embedded surgical guide in mandibular reconstruction with microvascular fibula flaps. MATERIALS AND METHODS: We retrospectively reviewed 35 patients who underwent primary mandibular reconstruction with a free fibula flap. They were divided into three groups according to the therapy they received. In group A, 12 patients underwent reconstruction using the modified surgical guide system, including virtual surgeries, pre-bent titanium plates, screw-predesignated cutting guides for mandibular and fibular osteotomies, and plate-embedded shaping guides...
December 2017: Oral Oncology
https://www.readbyqxmd.com/read/29223700/unilateral-sagittal-split-ramus-osteotomy-an-alternative-for-some-cases-of-asymmetric-mandibular-prognathism
#8
R Fariña, C Mebus, C Mayer, R Torrealba, E Moreno
The objective of this study was to propose a treatment protocol for patients with lateral prognathism based on the unilateral sagittal split ramus osteotomy (USSRO). This was a prospective study involving 31 patients with lateral prognathism, who required a bilateral sagittal split ramus osteotomy (BSSRO). Two groups were formed using the proposed protocol, with specific inclusion criteria for each group: BSSRO (n=17) and USSRO (n=14). Occlusal parameters (dental midline deviation, overbite, and overjet) were measured preoperatively (T0), at model surgery (T1), 1 month postoperative (T2), and 1year after surgery (T3) and compared...
December 6, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29215195/temporomandibular-joint-positional-change-accompanies-post-surgical-mandibular-relapse-a-long-term-retrospective-study-among-patients-who-underwent-mandibular-advancement
#9
M Z Miao, B Wang, D Wu, S Zhang, S Wong, O Shi, A Hu, L Mao, B Fang
OBJECTIVE: This study evaluated the relationship between follow-up temporomandibular joint positional change and mandibular stability among patients who had orthognathic and orthodontic treatment for a skeletal Class II malocclusion. METHODS: Thirty-seven patients who underwent 2-jaw surgery (Le Fort I osteotomy, bilateral sagittal split ramus osteotomy and genioplasty with rigid internal fixation) were included with an average follow-up length of 8.10 ± 2.06 years...
December 7, 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/29211352/histopathological-evaluation-of-the-effect-of-locally-administered-strontium-on-healing-time-in-mandibular-fractures-an-experimental-study
#10
Kasım Durmuş, Nergiz Hacer Turgut, Mehtap Doğan, Ersin Tuncer, Hatice Özer, Emine Elif Altuntaş, Melih Akyol
BACKGROUND: Mandibular fractures are the most common facial fractures. They can be treated by conservative techniques or by surgery. The authors hypothesized that the application of a single local dose of strontium chloride would accelerate the healing of subcondylar mandibular fractures, shorten the recovery time and prevent complications. OBJECTIVES: The aim of the present pilot study was to evaluate the effects of a single local dose of strontium chloride on the healing of subcondylar mandibular fractures in rats...
October 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29196229/chin-wing-technical-note
#11
P Pouzoulet, F Cheynet, L Guyot, J M Foletti, C Chossegros, P Cresseaux
The chin may be concerned by morphological abnormalities in its various dimensions. Classical genioplasty techniques can be used to correct these but have some disadvantages. The "chin wing", described by Triaca, is a technique of genioplasty extended to the mandibular angles, considering the mandibular basilar border as an anatomical unit, thus achieving a better harmonious functional and aesthetic result. The preoperative assessment included a mandibular Cone Beam to evaluate the position of the inferior alveolar nerve...
November 28, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29188642/-evaluation-for-vertical-stability-after-various-orthognathic-surgical-treatment-plans-for-skeletal-class-%C3%A2-malocclusion-with-anterior-open-bite
#12
Liu Xianwen, Ai Weijian, Zhou Huixi, Li Yunfeng, Liu Shuguang
OBJECTIVE: To evaluate vertical stability after various orthognathic surgical treatment plans for skeletal class Ⅲ malocclusion with anterior openbite. METHODS: A retrospective multicenter cohort study was conducted to investigate vertical stability after various orthognathic surgical treatment plans for skeletal class Ⅲ malocclusion with anterior openbite. From 2010-2016, 122 patients from two domestic stomatological hospitals were included in our study. Patients were divided into four groups according to their treatment plans, namely, bilateral sagittal split ramus osteotomy (BSSRO), intraoral vertical ramus osteotomy (IVRO), BSSRO+Le Fort Ⅰ, and IVRO+Le Fort Ⅰ...
October 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29146395/correlation-between-intraoperative-proximal-segment-rotation-and-post-sagittal-split-ramus-osteotomy-relapse-a-three-dimensional-cone-beam-computed-tomography-study
#13
B-J Choi, B-S Lee, Y-D Kwon, J-W Lee, S-U Yun, K-S Ryu, J-Y Ohe
This study evaluated the effects of proximal segment rotation and the extent of mandibular setback on post-sagittal split ramus osteotomy (SSRO) relapse using three-dimensional (3D) analysis. Thirty-one patients diagnosed with a skeletal class III malocclusion who underwent SSRO alone were enrolled in this study. The movements of the mandibular condyles were assessed using cone beam computed tomography (CBCT) and a 3D imaging program at ≤1 month before the operation (T0), 1 week after the operation (T1), and 6 months (T2) and 1year (T3) postoperative...
November 13, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29142870/intracorporeal-reduction-of-condylar-fracture-using-both-pedicled-condylar-and-seperated-ramal-fragments-after-vertical-ramal-osteotomy
#14
Il-Kyu Kim, Jun-Min Jang, Hyun-Young Cho, Ji-Hoon Seo, Dong-Hwan Lee
The aim of this study is to introduce a surgical technique that can maintain blood supply to prevent condylar resorption in the extracorporeal reduction of condylar fracture. Neither the medial pterygoid muscle on the ramal bone nor the lateral pterygoid muscle on the condylar fragment was detached after vertical ramal osteotomy. Thus, reduction was performed in the intracorporeal state. Therefore, blood supply was expected to be maintained to the fragments of both the condylar and ramal bones. On postoperative radiographs, the anatomical outline of the fractured condyle was well restored, and the occlusion was stable...
October 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/29133198/study-of-the-mechanical-reliability-of-an-s-shaped-adjustable-osteosynthesis-plate-for-bilateral-sagittal-split-osteotomies-study-on-15-consecutive-cases
#15
A Veyssiere, N Leprovost, B Ambroise, R Prévost, A Chatellier, H Bénateau
INTRODUCTION: The main challenge during the osteosynthesis of a bilateral sagittal split osteotomy (BSSO) is to take into account the correct position of the condyle. Adjustable plates can be used to fine-tune the final occlusion without changing the osteosynthesis. A new type of adjustable plate is presented in this article. The aim is to assess the mechanical reliability of this system during the surgery and during the healing period, thanks to a preliminary prospective on 15 consecutive cases...
November 10, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29116013/the-influence-of-dexamethasone-on-postoperative-swelling-and-neurosensory-disturbances-after-orthognathic-surgery-a-randomized-controlled-clinical-trial
#16
W Semper-Hogg, M A Fuessinger, T W Dirlewanger, C P Cornelius, M C Metzger
BACKGROUND: Orthognathic surgery is associated with considerable swelling and neurosensory disturbances. Serious swelling can lead to great physical and psychological strain. A randomized, prospective, controlled clinical trial was realized in order to evaluate the effect of a preoperative intravenous dexamethasone injection of 40 mg on postoperative swelling and neurosensory disturbances after orthognathic surgery. METHODS: Thirty-eight patients (27 male and 11 female) patients, all with the indication for an orthognathic surgery, were enrolled in this study (mean age: 27...
November 7, 2017: Head & Face Medicine
https://www.readbyqxmd.com/read/29112826/immunohistochemical-analysis-on-cortex-to-cortex-healing-after-mandibular-vertical-ramus-osteotomy-a-preliminary-study
#17
Hwi-Dong Jung, Sang Yoon Kim, Han-Sung Jung, Hyung-Sik Park, Young-Soo Jung
PURPOSE: The present study analyzed the expression of specific cytokines in the transforming growth factor (TGF)-β superfamily postoperatively after mandibular vertical ramus osteotomy (VRO). MATERIALS AND METHODS: Four beagle dogs were enrolled and euthanized at 1, 2, 4, and 8 weeks postoperatively for immunohistochemical analysis using 6 specific antibodies (bone morphogenetic protein [BMP]-2/4, BMP-7, TGF-β2, TGF-β3, matrix metalloproteinase-3, and vascular endothelial growth factor [VEGF])...
October 13, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29109944/surgical-excision-of-osteochondroma-on-mandibular-condyle-via-preauricular-approach-with-zygomatic-arch-osteotomy
#18
Sang-Hoon Park, Jun-Hyeong An, Jeong Jun Han, Seunggon Jung, Hong-Ju Park, Hee-Kyun Oh, Min-Suk Kook
Background: Osteochondroma is a benign tumor that tends to develop in mandibular condyle and coronoid process in the craniofacial region. If tumor mass has grown from condyle into the infratemporal space with zygomatic arch obstructing the access, there are risks associated with surgical exposure and local resection of these masses. Case presentation: This study reports on a case of osteochondroma on mandibular condylar head where we treated with surgical excision via preauricular approach with 3D analysis...
December 2017: Maxillofacial Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29109943/evaluation-of-mandibular-lingula-and-foramen-location-using-3-dimensional-mandible-models-reconstructed-by-cone-beam-computed-tomography
#19
Cong Zhou, Tae-Hyun Jeon, Sang-Ho Jun, Jong-Jin Kwon
Background: The positions of the mandibular lingula and foramen have been set as indexes for inferior alveolar nerve (IAN) block and ramus osteotomies in orthognathic surgery. This study aimed to evaluate the anatomical structures of mandibular ramus, especially the mandibular lingula and foramen, by analyzing the cone-beam computed tomography (CBCT) data of young adults. Methods: We evaluated 121 sides of hemi-mandibular CBCT model of 106 patients (51 male and 55 female patients; 18 to 36 years old)...
December 2017: Maxillofacial Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29103446/miniscrew-assisted-multidisciplinary-orthodontic-treatment-with-surgical-mandibular-advancement-and-genioplasty-in-a-brachyfacial-class-ii-patient-with-mandibular-asymmetry
#20
Vanessa Paredes-Gallardo, Verónica García-Sanz, Carlos Bellot-Arcís
This article describes the complex dental treatment of a 43-year-old man with skeletal Class II, mandibular asymmetry, severe brachyfacial pattern, Class II Division 2, canting of the occlusal plane, and an increased curve of Spee. To achieve optimal results, we adopted a multidisciplinary approach to treatment, involving periodontics, oral surgery, orthodontics, maxillofacial surgery, and prosthetics specialists. After periodontal treatment, miniscrews were placed to correct the occlusal plane canting and the excessive curve of Spee with orthodontic treatment...
November 2017: American Journal of Orthodontics and Dentofacial Orthopedics
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