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Mandibular 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/27892493/autologous-temporomandibular-joint-reconstruction-independent-of-exogenous-additives-a-proof-of-concept-study-for-guided-self-generation
#3
Jiao Wei, Tanja Herrler, Dong Han, Kai Liu, Rulin Huang, Markus Guba, Chuanchang Dai, Qingfeng Li
Joint defects are complex and difficult to reconstruct. By exploiting the body's own regenerative capacity, we aimed to individually generate anatomically precise neo-tissue constructs for autologous joint reconstruction without using any exogenous additives. In a goat model, CT scans of the mandibular condyle including articular surface and a large portion of the ascending ramus were processed using computer-aided design and manufacturing. A corresponding hydroxylapatite negative mold was printed in 3D and temporarily embedded into the transition zone of costal periosteum and perichondrium...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27891264/world-s-first-clinical-case-of-gene-activated-bone-substitute-application
#4
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/27890226/tissue-engineering-for-vertical-ridge-reconstruction
#5
REVIEW
Neel Patel, Beomjune Kim, Waleed Zaid, Daniel Spagnoli
This article provides an overview of basic tissue engineering principles as they are applied to vertical ridge defects and reconstructive techniques for these types of deficiencies. Presented are multiple clinical cases ranging from office-based dentoalveolar procedures to the more complex reconstruction of postresection mandibular defects. Several different types of regenerative tissue constructs are presented; either used alone or in combination with traditional reconstructive techniques and procedures, such as maxillary sinus augmentation, Le Fort I osteotomy, and microvascular free tissue transfer...
February 2017: Oral and Maxillofacial Surgery Clinics of North America
https://www.readbyqxmd.com/read/27887036/customized-mandibular-reconstruction-plates-improve-mechanical-performance-in-a-mandibular-reconstruction-model
#6
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/27876545/submental-island-flap-reconstruction-in-oral-cavity-cancer-patients-with-level-i-lymph-node-metastasis
#7
P Sittitrai, C Srivanitchapoom, D Reunmakkaew, K Yata
The submental island flap is useful as an alternative to microvascular free tissue transfer for the reconstruction of defects after resection of oral cancer because it is simple to harvest, reliable, and is associated with good oral function and low morbidity. However, because cancer of the oral cavity carries a risk of level I nodal metastases, the oncological safety of the flap remains controversial. Between April 2012 and September 2016, we studied patients with squamous cell carcinoma of the oral cavity who underwent surgical resection with submental island flap reconstruction for viability of the flap, signs of recurrence, and complications...
November 19, 2016: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/27875515/reconstruction-of-congenital-mandibular-hypoplasia-with-microvascular-free-fibula-flaps-in-the-pediatric-population-a-paradigm-shift
#8
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/27875509/osseous-repair-in-minimally-invasive-reconstruction-of-anterior-skull-base-defects
#9
Vijay R Ramakrishnan, Adam M Terella, Seerat Poonia, Alexander G Chiu, James N Palmer
Management of anterior skull base defects is an area of continued innovation for skull base surgeons. Various grafting materials have been advocated for the repair of skull base defects depending on needs, availability, harvest site morbidity, and surgeon preference. Spontaneous bony closure of small skull defects is known to occur in animal models without bone grafts, but this phenomenon has been unexplored in the human skull base. The objective of this study was to evaluate osseous skull base closure in patients undergoing endoscopic repair of skull base defects...
November 21, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27871294/newly-designed-retentive-posts-of-mandibular-reconstruction-plate-in-oral-cancer-patients-based-on-preliminary-fem-study
#10
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
#11
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
#12
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/27858077/-cone-beam-computed-tomography-evaluation-of-short-and-long-term-airway-changes-in-patients-with-skeletal-class-%C3%A2-malocclusion-treated-by-orthodontic-therapy-and-bimaxillary-surgery-with-or-without-mandibular-setback-surgery
#13
Hong-Wei Wang, Li-Yan Li, Su-Qing Qi, Ming Yan
PURPOSE: To evaluate the short-term and long-term effects of pharyngeal airway in skeletal Class Ⅲ malocclusion patients who underwent bimaxillary surgery or isolated mandibular setback-orthodontic treatment. METHODS: The sample included 54 patients (28 males, 26 females) who were diagnosed with skeletal Class Ⅲ malocclusion. Patents in group A (n=28) underwent mandibular setback surgery and orthodontic treatment. Cone-beam CT (CBCT) was taken at one week before treatment (T0), 6 months (T1) and 3 years after surgery (T2)...
August 2016: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/27836445/-masticatory-system-and-maxillofacial-prosthesis-from-pathology-to-function-recovering
#14
S Vo Quang, J Dichamp
Maxillofacial prosthesis (MFP) can be defined as the art and science of esthetic and functional reconstruction of the facial bones, art because it uses hand-crafted and empirical rules, science because of its technical rigorism and its integration in medicine. MFP aims to multidisciplinary rehabilitate patients presenting with cutaneous and underlying structures defects, It also allows for functional speech and swallowing rehabilitation related to temporo-mandibular joint disorders. Whatever the origin, (traumatic, infectious ortumoral), surgical treatment of these TMJ disorders is usually not indicated in first-line...
November 8, 2016: Revue de Stomatologie, de Chirurgie Maxillo-faciale et de Chirurgie Orale
https://www.readbyqxmd.com/read/27836236/optimising-ballistic-facial-coverage-from-military-fragmenting-munitions-a-consensus-statement
#15
J Breeze, D C Tong, D Powers, N A Martin, A M Monaghan, D Evriviades, J Combes, G Lawton, C Taylor, A Kay, J Baden, B Reed, N MacKenzie, A J Gibbons, S Heppell, R F Rickard
VIRTUS is the first United Kingdom (UK) military personal armour system to provide components that are capable of protecting the whole face from low velocity ballistic projectiles. Protection is modular, using a helmet worn with ballistic eyewear, a visor, and a mandibular guard. When all four components are worn together the face is completely covered, but the heat, discomfort, and weight may not be optimal in all types of combat. We organized a Delphi consensus group analysis with 29 military consultant surgeons from the UK, United States, Canada, Australia, and New Zealand to identify a potential hierarchy of functional facial units in order of importance that require protection...
November 8, 2016: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/27833334/mandibular-reconstruction-overview
#16
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/27830889/sectioned-images-and-surface-models-of-a-cadaver-for-understanding-the-free-vascularized-anterior-rib-flap
#17
Dong Sun Shin, Hyung Jun Kim, Bong Chul Kim
BACKGROUND: The purpose of this study is to describe the vascularized anterior rib flap on sectioned images and surface models using Visible Korean for medical education and clinical training in the field of mandibular reconstructive surgery. MATERIALS AND METHODS: Serially sectioned images of the thorax were obtained from a cadaver. Significant structures in the sectioned images were outlined and stacked to create a surface model. RESULTS: The PDF file (8...
November 10, 2016: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/27825665/-morbidity-of-autologous-bone-harvesting-in-implantology-literature-review-from-1990-to-2015
#18
L Costa Mendes, T Sauvigné, J Guiol
INTRODUCTION: Autogenous bone is commonly used in pre-implant bone reconstructions. Five harvesting sites are frequently used: mandibular symphysis and ramus, iliac crest, calvaria and tibia. One of the deciding criterions among these sites is the donor site morbidity. The purpose of our work was to analyze the intra- and postoperative complications that may occur on the different donor sites. MATERIAL AND METHODS: An automatic and manual search on Medline covering the period 1990-2015 was made...
November 4, 2016: Revue de Stomatologie, de Chirurgie Maxillo-faciale et de Chirurgie Orale
https://www.readbyqxmd.com/read/27816276/desmoplastic-fibroma-of-the-mandible-in-young-children-a-case-series
#19
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
#20
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
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