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Mandible reconstruction

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https://www.readbyqxmd.com/read/27893561/finite-element-evaluation-of-different-osteosynthesis-variations-that-used-after-segmental-mandibular-resection
#1
Koray Onur Şanal, Bora Özden, Burcu Baş
PURPOSE: The purpose of this study was to evaluate the effect of different reconstruction plates and screw combinations on stress distribution of segmental resected mandibles using finite element analysis. METHODS: Lateral (L) and lateral-central (LC) defects were simulated by a computer aided design modeling. The straight (s) and angular (a) titanium locking reconstruction plates of 2.5 mm (12 holes for L defects and 16 holes for LC defects) were modeled. Each screw was 2...
November 23, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27893003/navigation-guidance-during-free-flap-mandibular-reconstruction-a-cadaveric-trial
#2
R Alex Harbison, Xiao-Feng Shan, Zachary Douglas, Scott Bevans, Yangming Li, Kris S Moe, Neal Futran, Jeffrey J Houlton
Importance: Segmental mandibulectomy for tumors that distort the buccal surface of the mandible present a reconstructive challenge. Objective: To determine whether mandible alignment after navigation-guided mandible reconstruction is better than alignment after non-template-assisted freehand reconstruction and as good as template-assisted reconstruction in a cadaveric trial. Design, Setting, and Participants: A cadaveric trial using 10 specimens was conducted at a tertiary academic center...
November 17, 2016: JAMA Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/27891264/world-s-first-clinical-case-of-gene-activated-bone-substitute-application
#3
I Y Bozo, R V Deev, A Y Drobyshev, A A Isaev, I I Eremin
Treatment of patients with large bone defects is a complex clinical problem. We have initiated the first clinical study of a gene-activated bone substitute composed of the collagen-hydroxyapatite scaffold and plasmid DNA encoding vascular endothelial growth factor. The first patient with two nonunions of previously reconstructed mandible was enrolled into the study. Scar tissues were excised; bone defects (5-14 mm) between the mandibular fragments and nonvascularized rib-bone autograft were filled in with the gene-activated bone substitute...
2016: Case Reports in Dentistry
https://www.readbyqxmd.com/read/27887036/customized-mandibular-reconstruction-plates-improve-mechanical-performance-in-a-mandibular-reconstruction-model
#4
Ralf Gutwald, Raimund Jaeger, Floor M Lambers
The purpose of this paper was to analyze the biomechanical performance of customized mandibular reconstruction plates with optimized strength. The best locations for increasing bar widths were determined with a sensitivity analysis. Standard and customized plates were mounted on mandible models and mechanically tested. Maximum stress in the plate could be reduced from 573 to 393 MPa (-31%) by increasing bar widths. The median fatigue limit was significantly greater (p < 0.001) for customized plates (650 ± 27 N) than for standard plates (475 ± 27 N)...
November 25, 2016: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/27886708/individual-tooth-segmentation-from-ct-images-scanned-with-contacts-of-maxillary-and-mandible-teeth
#5
Zeyang Xia, Yangzhou Gan, Lichao Chang, Jing Xiong, Qunfei Zhao
BACKGROUND AND OBJECTIVE: Tooth segmentation from computed tomography (CT) images is a fundamental step in generating the three-dimensional models of tooth for computer-aided orthodontic treatment. Individual tooth segmentation from CT images scanned with contacts of maxillary and mandible teeth is especially challenging, and no method has been reported previously. This study aimed to develop a method for individual tooth segmentation from these images. METHODS: Tooth contours of maxilla and mandible are first segmented from the volumetric CT images slice-by-slice...
January 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/27875515/reconstruction-of-congenital-mandibular-hypoplasia-with-microvascular-free-fibula-flaps-in-the-pediatric-population-a-paradigm-shift
#6
Emily C Cleveland, Jamie Zampell, Tomer Avraham, Z-Hye Lee, David Hirsch, Jamie P Levine
BACKGROUND: The microvascular free fibula flap has become the gold standard for reconstruction of complex mandibular defects since its description by Hidalgo in 1989. Prior studies have demonstrated its safety and efficacy in the pediatric population. However, this reconstructive method is often used only as a last resort for correction of congenital mandibular hypoplasia, after failure of bone grafting and distraction osteogenesis. The authors describe our experience using this technique, facilitated by virtual planning and prefabricated cutting jigs, for children with severe congenital mandibular hypoplasia...
November 21, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27871705/applications-of-cone-beam-computed-tomography-to-assess-the-effects-of-labial-crown%C3%A2-morphologies-and-collum-angles-on%C3%A2-torque%C3%A2-for-maxillary-anterior-teeth
#7
Wei-Dong Kong, Jun-Yu Ke, Xiang-Quan Hu, Wu Zhang, Shu-Shu Li, Yi Feng
INTRODUCTION: Currently, cone-beam computed tomography (CBCT) has been widely used because of its capacity to evaluate the anatomic structures of the maxilla, mandible, and teeth in 3 dimensions. However, articles about the use of CBCT to evaluate the relationships between the morphology of individual teeth and torque expression remain rare. In this study, we aimed to determine the influence of labial crown morphologies and collum angles on torque for maxillary anterior teeth using CBCT...
November 2016: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/27871294/newly-designed-retentive-posts-of-mandibular-reconstruction-plate-in-oral-cancer-patients-based-on-preliminary-fem-study
#8
Ik Jae Kwon, Mi Young Eo, Sung Jae Park, Soung Min Kim, Jong Ho Lee
BACKGROUND: The reconstruction of a large mandibular defect poses a challenging issue in oral cancer ablation surgery. One popular option for mandibular continuity reconstruction after tumor resection involves the use of a reconstruction plate (R-plate), which maintains space and contour without bone harvesting. An R-plate, however, cannot provide final functional loading rehabilitation with implants or dentures. METHODS: We suggest a new method of functional mandibular reconstruction using retentive posts and an upper prosthesis...
November 21, 2016: World Journal of Surgical Oncology
https://www.readbyqxmd.com/read/27867669/simplifying-the-treatment-of-bone-atrophy-in-the-posterior-regions-combination-of-zygomatic-and-wide-short-implants-a-case-report-with-2-years-of-follow-up
#9
Fernanda Faot, Geninho Thomé, Amália Machado Bielemann, Caio Hermann, Ana Cláudia Moreira Melo, Luis Eduardo Marques Padovan, Ivete Aparecida de Mattias Sartori
The rehabilitation of maxillary and mandibular bone atrophy represents one of the main challenges of modern oral implantology because it requires a variety of procedures, which not only differ technically, but also differ in their results. In the face of limitations such as deficiencies in the height and thickness of the alveolar structure, prosthetic rehabilitation has sought to avoid large bone reconstruction through bone grafting; this clinical behavior has become a treatment system based on evidence from clinical scientific research...
2016: Case Reports in Dentistry
https://www.readbyqxmd.com/read/27861470/-mandibular-osteoradionecrosis-orn-as-a-side-effect-of-head-and-neck-cancer-treatment-factors-that-induce-it
#10
José Francisco Gallegos-Hernández, Alejandro Reyes-Vivanco, Héctor Arias-Ceballos, Gerardo Gabriel Minauro-Muñoz, Alma Lilia Ortiz-Maldonado, Daniel Israel García-Ruiz, Martín Hernández-Sanjuán
INTRODUCTION: Osteoradionecrosis of the mandible is a relatively common complication in patients with head and neck cancer undergoing radiotherapy or concomitant chemoradiotherapy, characterized by exposure of the mandibular bone either in the mouth or in the facial skin, with no improvement with conservative treatment for six months. The risk factors are radiotherapy in head and neck region, lack of dental prophylaxis before treatment and dental extraction. MATERIAL AND METHODS: Retrospective observational study analyzing incidence and etiologic factors of osteoradionecrosis in 250 patients undergoing radiotherapy or combined treatment of cervicofacial area between 2002 and 2010...
November 2016: Gaceta Médica de México
https://www.readbyqxmd.com/read/27843262/ewing-s-sarcoma-of-mandible-an-impressive-case-of-spontaneous-mandible-regeneration
#11
Ioannis Chatzistefanou, Sotiria Kabesi, Konstantinos Paraskevopoulos, Dimitrios Koliouskas, Konstantinos Antoniades
: Ewing's sarcoma (ES) is an uncommon aggressive bone malignancy that mainly affects children and adolescents. Mandible involvement is quite rare and usually represents metastasis from another skeletal site. Combined therapy including wide surgical resection and preoperative and postoperative chemotherapy has been demonstrated as the mainstay of therapeutic approach. As improved therapeutic modalities have significantly increased survival over the last decades, functional and esthetic reconstruction of the postmandibulectomy defect is usually necessary for patient's total rehabilitation...
July 2016: International Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/27833716/transoral-segmental-resection-and-disarticulation-of-mandible-with-immediate-nonvascularized-reconstruction-a-case-report
#12
Hemant Gupta, Deepak Singh, Sumit Gupta, Hemant Mehra, Jasmeet Singh, Ravish Mishra
Disarticulation resections are required for treatment of variety of pathologies of the jaws. These resections are mostly carried out through extraoral approach, which bear significant postoperative morbidity. The transoral approach may be used for this purpose in benign pathological cases of the mandible to limit the postoperative morbidity of extraoral approach, as it provides sufficient access not only for resection and disarticulation but also for immediate reconstruction. This article shares our experience with transoral approach for resection and disarticulation in a case of kerato cystic odontogenic tumor and simultaneous reconstruction...
November 2016: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/27833336/sub-periosteal-dissection-with-denture-guided-epithelial-regeneration-a-novel-method-for-peri-implant-soft-tissue-management-in-reconstructed-mandibles
#13
Vinay V Kumar, P C Jacob, Moni A Kuriakose
BACKGROUND: In patients with reconstructed mandibles using free fibula flaps, management of soft tissues around implants supporting dental rehabilitation, is often a clinical problem. AIM: The aim of this paper is to describe a new technique, namely "Sub-periosteal dissection and denture-guided epithelial regeneration (SD-DGER)", as a method of peri-implant soft tissue management in these patients. MATERIALS AND METHODS: The technique consists of performing a subperiosteal dissection with creation of buccal and lingual flaps...
December 2016: Journal of Maxillofacial and Oral Surgery
https://www.readbyqxmd.com/read/27833334/mandibular-reconstruction-overview
#14
REVIEW
Batchu Pavan Kumar, V Venkatesh, K A Jeevan Kumar, B Yashwanth Yadav, S Ram Mohan
INTRODUCTION: Mandibular reconstruction has changed significantly over the years and continues to evolve with the introduction of newer technologies and techniques. PURPOSE: This article reviews the history of oromandibular reconstruction, biomechanics of mandible, summarizes the reconstruction options available for mandible with defect classification, goals in reconstruction, the various donor sites, current reconstructive options, dental rehabilitation and persistent associated problems...
December 2016: Journal of Maxillofacial and Oral Surgery
https://www.readbyqxmd.com/read/27833286/diagnostic-tools-in-maxillofacial-fractures-is-there-really-a-need-of-three-dimensional-computed-tomography
#15
Sheerin Shah, Sanjeev K Uppal, Rajinder K Mittal, Ramneesh Garg, Kavita Saggar, Rishi Dhawan
INTRODUCTION: Because of its functional and cosmetic importance, facial injuries, especially bony fractures are clinically very significant. Missed and maltreated fractures might result in malocclusion and disfigurement of the face, thus making accurate diagnosis of the fracture very essential. In earlier times, conventional radiography along with clinical examination played a major role in diagnosis of maxillofacial fractures. However, it was noted that the overlapping nature of bones and the inability to visualise soft tissue swelling and fracture displacement, especially in face, makes radiography less reliable and useful...
May 2016: Indian Journal of Plastic Surgery: Official Publication of the Association of Plastic Surgeons of India
https://www.readbyqxmd.com/read/27816276/desmoplastic-fibroma-of-the-mandible-in-young-children-a-case-series
#16
B Khatib, M A Pogrel
Desmoplastic fibromas are rare, benign, but aggressive lesions, affecting predominantly young people, with an affinity for the mandible. Four patients with desmoplastic fibromas of the mandible, seen between 1995 and 2015 with long-term follow-up, were identified. Three were treated by wide mandibular resection and immediate reconstruction with rib grafts, and one was treated with chemotherapy. In the three resected cases, there has been no recurrence and all rib grafts were successfully incorporated. The case treated by chemotherapy has persistence of the tumour, but it is not progressing...
November 2, 2016: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27815013/mandibular-reconstruction-after-cancer-an-in-house-approach-to-manufacturing-cutting-guides
#17
R Bosc, B Hersant, R Carloni, J Niddam, J Bouhassira, H De Kermadec, E Bequignon, T Wojcik, M Julieron, J-P Meningaud
The restoration of mandibular bone defects after cancer can be facilitated by computer-assisted preoperative planning. The aim of this study was to assess an in-house manufacturing approach to customized cutting guides for use in the reconstruction of the mandible with osteocutaneous free flaps. A retrospective cohort study was performed, involving 18 patients who underwent mandibular reconstruction with a fibula free flap at three institutions during the period July 2012 to March 2015. A single surgeon designed and manufactured fibula and mandible cutting guides using a computer-aided design process and three-dimensional (3D) printing technology...
November 1, 2016: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27810795/automated-planning-with-multivariate-shape-descriptors-for-fibular-transfer-in-mandibular-reconstruction
#18
Megumi Nakao, Shimpei Aso, Yuichiro Imai, Nobuhiro Ueda, Toshihide Hatanaka, Mao Shiba, Tadaaki Kirita, Tetsuya Matsuda
OBJECTIVE: This paper introduces methods to automate preoperative planning of fibular segmentation and placement for mandibular reconstruction with fibular flaps. METHODS: Preoperative virtual planning for this type of surgery has been performed by manual adjustment of many parameters, or based upon a single feature of the reconstruction. We propose a novel planning procedure formulated as a non-convex minimization problem of an objective function using the multilateral shape descriptors...
October 26, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27796608/reconstruction-of-tooth-bearing-portion-of-mandible-using-polyglactin-910-sutures-for-internal-fixation-in-the-third-world-functional-and-cosmetic-outcome
#19
Bayo Aluko-Olokun, Ademola A Olaitan, Oluseun A Aluko-Olokun
BACKGROUND: This study analyzed the cosmetic and functional outcome of cases involving reconstruction of tooth-bearing portion of the lower jaw, using a polyglactin 910 suture for fixation. PATIENTS AND METHOD: This prospective intervention study documented the treatment outcome in 25 consecutive adult patients, who underwent immediate mandibular reconstruction following segmental resection of tooth-bearing portion of mandible. Cortico-cancellous bone graft was taken from the inner table of iliac bone, sparing the crest...
October 29, 2016: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27790591/prosthodontic-rehabilitation-of-accidental-maxillofacial-gunshot-injury-using-dental-implants-a-five-year-follow-up-clinical-report
#20
Vinod Balla, Angleena Y Daniel, Nirmal Kurian
Gunshot injuries to the face can have serious aesthetic, functional, and psychological consequences. The incapacitating nature of maxillofacial defects makes reconstruction of the maxilla and mandible challenging, owing to multiple surgeries and extensive rehabilitation phase. Outcome of prosthodontic treatment is one of the important parameters by which a patient measures the success of rehabilitation. A 5-year follow-up of comprehensive surgical and prosthodontic reconstruction of a gunshot injury using dental implants is described...
September 2016: Journal of Clinical and Diagnostic Research: JCDR
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