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Reconstruction of mandible

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https://www.readbyqxmd.com/read/28226956/stability-of-the-permanently-bent-plates-used-in-mandibular-reconstructive-surgery
#1
Si-Myung Park, Deukhee Lee, Jung-Woo Lee, Youngjun Kim, Laehyun Kim, Gunwoo Noh, Si-Myung Park, Deukhee Lee, Jung-Woo Lee, Youngjun Kim, Laehyun Kim, Gunwoo Noh, Youngjun Kim, Si-Myung Park, Jung-Woo Lee, Laehyun Kim, Gunwoo Noh, Deukhee Lee
In mandibular reconstructive surgery, straight surgical plates are predominantly used for osteotomy. In this process, a straight plate is bent to fit to the shape of the patient's defect. This potentially compromises the stability of the plate because of changes in mechanical properties resulting from plastic deformation; however, the effect of plastic deformation on stability has yet been investigated. In this study, we assess the stability of three types of commonly used bent plates for two types of mandible defect cases, using three-dimensional finite element analysis (FEA)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28220302/sex-estimation-using-computed-tomography-of-the-mandible
#2
Tanya Sella Tunis, Rachel Sarig, Haim Cohen, Bahaa Medlej, Nathan Peled, Hila May
Sex estimation of skeletal parts is of great value even in the DNA era. When computed tomography (CT) facilities were introduced to forensic institutes, new possibilities for sex estimation emerged. The aim of this study was to develop a CT-based method for sex estimation using the mandible. Twenty-five CT-based measurements of the mandible were developed and carried out on 3D reconstructions (volume rendering) and cross sections of the lower jaw of 438 adult individuals (214 males and 224 females). Intraobserver and interobserver variances of the measurements were examined using intraclass correlation coefficient (ICC) analysis...
February 20, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28218215/correlation-between-condylar-fracture-pattern-after-parasymphyseal-impact-and-condyle-morphological-features-a-retrospective-analysis-of-107-chinese-patients
#3
Lu Han, Ting Long, Wei Tang, Lei Liu, Wei Jing, Wei-Dong Tian, Jie Long
BACKGROUND: The treatment of the condylar fractures is difficult. Factors that result in the fractures are complex. The objective of this morphometric study was to investigate the relationship between condylar fracture patterns and condylar morphological characteristics. METHODS: We conducted a retrospective analysis of 107 patients admitted to the West China Hospital of Stomatology for bilateral condylar fractures caused by parasymphyseal impact. The patients were divided into five groups according to the type of condylar fracture...
2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28212127/surgical-management-of-mandibular-intraosseous-schwannomas
#4
Anthony DeLeonibus, Bahar Bassiri Gharb, Francis Papay, James E Zins, Antonio Rampazzo
Intraosseous schwannomas of the mandible are rare tumors that usually arise from peripheral nerve sheaths of the main trunk or branches of the inferior alveolar nerve (IAN).A systematic review of the English literature through PubMed was conducted from 1945 to 2016. Forty-nine patients of mandibular intraosseous schwannomas were identified. The most common location of the tumor was the posterior mandible (61.2%). There were 28 patients in whom the tumor involved the IAN (57.1%). The most commonly performed procedures included enucleation through a mucoperiosteal flap and a bone window (73%), curettage (10%), segmental mandibulectomy (10%), and sagittal split ramus osteotomy (6%)...
February 16, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28210412/reconstruction-of-a-combined-maxillectomy-and-segmental-mandibulectomy-defect-in-a-seven-year-old-with-a-single-free-fibula-osteocutaneous-flap
#5
Shawn T Joseph, Krishnakumar Thankappan, Subramania Iyer
Combined upper alveolectomy and segmental mandibulectomy are complex defects. Reconstruction of these defects is usually suboptimal. We describe the case of a pediatric patient with vessel-depleted neck with recurrent vascular malformation involving the ramus and coronoid process of mandible and a previous history of maxillectomy and a reconstruction with anterolateral thigh flap. The patient underwent wide resection. The defects involving the upper alveolus and mandible were simultaneously reconstructed with a single free fibula flap...
March 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/28210401/zygomatic-intraosseous-hemangioma-case-report-and-literature-review
#6
REVIEW
David B Powers, Elda Fisher, Detlev Erdmann
Intraosseous hemangiomas are uncommon intrabony lesions, representing approximately 0.5 to 1% of all intraosseous tumors. Their description varies from "benign vasoformative neoplasms" to true hamartomatous proliferations of endothelial cells forming a vascular network with intermixed fibrous connective tissue stroma. These commonly present as a firm, painless swelling. Intraosseous hemangiomas present more commonly in females than in males and most likely occur in the fourth decade of life. The most common etiology of intraosseous hemangioma is believed to be prior trauma to the area...
March 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/28203515/curvilinear-segmental-mandibular-reconstruction-utilizing-distraction-osteogenesis-and-early-open-callus-manipulation
#7
Alberto Rocha Pereira, Paulo Neves, José Rosa, Scott Bartlett
The authors present a new technique for reconstruction of large curvilinear mandibular defects with distraction osteogenesis and early open callus manipulation. In phase 1, transport disks are created from mandibular bone and distracted across the entire length of the defect, without the restriction from a mandible plate fixation. This allows for full-length distraction until enough regenerate is obtained to reconstruct the defect without the need for additional bone grafts. Taking advantage of the soft moldable regenerate, the second and final operative procedure allows for the manipulation, repositioning, and fixation of the transported segments in the ideal position creating perfect tridimensional form and symmetry of the mandible arch...
January 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28197824/in-vitro-cytotoxicity-and-surface-topography-evaluation-of-additive-manufacturing-titanium-implant-materials
#8
Jukka T Tuomi, Roy V Björkstrand, Mikael L Pernu, Mika V J Salmi, Eero I Huotilainen, Jan E H Wolff, Pekka K Vallittu, Antti A Mäkitie
Custom-designed patient-specific implants and reconstruction plates are to date commonly manufactured using two different additive manufacturing (AM) technologies: direct metal laser sintering (DMLS) and electron beam melting (EBM). The purpose of this investigation was to characterize the surface structure and to assess the cytotoxicity of titanium alloys processed using DMLS and EBM technologies as the existing information on these issues is scarce. "Processed" and "polished" DMLS and EBM disks were assessed...
March 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28195893/functional-outcomes-and-complications-of-robot-assisted-free-flap-oropharyngeal-reconstruction
#9
Yueh-Chi Tsai, Shih-An Liu, Chih-Sheng Lai, Yen-Wei Chen, Chen-Te Lu, Jung-Hsing Yen, I-Chen Chen
BACKGROUND: Robotic surgical systems provide a clear, magnified 3-dimensional visualization as well as precise, stable instrumental movement, thereby minimizing technical difficulties that may be encountered in the surgical treatment of oropharyngeal tumors. This study assessed the outcomes of robotic-assisted free flap oropharyngeal reconstruction compared with those of conventional free flap reconstruction. MATERIALS AND METHODS: A retrospective review of 47 patients who underwent reconstructive operations using a free radial forearm fasciocutaneous flap for oropharyngeal defects was conducted over a 20-month period (May 2013-December 2014)...
February 14, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28187692/rare-case-of-giant-unicystic-ameloblastoma-luminal-variant
#10
Adarsh Kudva, Abhay T Kamath, Nirmala N Rao, Jyotsna Rajan
OBJECTIVE AND IMPORTANCE: Ameloblastoma is a locally aggressive benign tumor, commonly occurring in the mandible. While giant ameloblastoma of multicystic or plexiform variant have been reported, the authors report a rare case of giant unicystic ameloblastoma of luminal variant, which was treated by compartmental resection and planned for delayed reconstruction. CLINICAL PRESENTATION: A 46 year old male patient reported to the oral surgery out-patient department with a swelling of the left side mandible region of 2 years duration...
February 10, 2017: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/28184080/the-financial-burden-for-the-surgical-management-of-osteoradionecrosis
#11
V Patel, L Ormondroyd, A Lyons, M McGurk
Osteoradionecrosis (ORN) remains a difficult clinical problem. In large refractory cases surgery appears to be the only option but it does not guarantee a cure and is expensive. Cost analysis of 31 patients who had resection with or without reconstruction of their mandible was £892,357. The largest cost was in-patient stay, which accounted for 62% of the total. This article explores in detail the expenditure associated with major ORN surgery and its subsequent implications.
February 10, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28152218/tailored-approach-to-oromandibular-reconstruction-in-patients-with-compromised-lower-limb-vessels
#12
Conor P Barry, James Brown, Rebecca Hanlon, Richard Shaw
BACKGROUND: The purpose of this study was to compare outcomes for segmental reconstruction of the mandible between patients who underwent reconstruction with a fibula flap (group 1), and those with an alternative osseous free flap in which the fibula flap was unsuitable either for defect reasons (group 2) or in which the fibula flap could not safely be harvested because of compromised leg vessels (group 3). METHODS: One hundred fifty-two patients who underwent osseous free flap reconstruction of a mandibular segmental defect between January 2008 and June 2014 were identified from operating records...
February 2, 2017: Head & Neck
https://www.readbyqxmd.com/read/28150520/an-anatomical-study-on-the-availability-of-contralateral-recipient-vessels-in-hemi-mandibular-reconstruction-with-vascularised-free-fibula-transfer
#13
Shogo Kasai, Tomohisa Nagasao, Yoshiaki Sakamoto, Yusuke Shimizu, Nobuaki Imanishi, Kazuo Kishi
BACKGROUND: In mandibular reconstruction with vascularised free fibula transfer, there are situations where the neck on the operated site lacks recipient vessels for vascular anastomosis due to previous radiological/surgical interventions. METHODS: The present study aims to clarify the availability of neck vessels on the contralateral side in such situations. Experimental surgery was conducted on 20 fresh cadavers (six males and 14 females). After the left half of the mandible was removed, free vascularised fibula of equivalent length was transferred to fill the defect...
February 2, 2017: Journal of Plastic Surgery and Hand Surgery
https://www.readbyqxmd.com/read/28137635/in-silico-analysis-of-the-biomechanical-stability-of-commercially-pure-ti-and-ti-15mo-plates-for-the-treatment-of-mandibular-angle-fracture
#14
Satoshi Yamaguchi, Rodolfo B Anchieta, Fernando P S Guastaldi, Nick Tovar, Daisuke Tawara, Satoshi Imazato, Paulo G Coelho
PURPOSE: To investigate the influence of different materials and fixation methods on maximum principal stress (MPS) and displacement in reconstruction plates using in silico 3-dimensional finite element analysis (3D-FEA). MATERIALS AND METHODS: Computer-assisted designed (CAD) models of the mandible and teeth were constructed. Champy and AO/ASIF plates and fixation screws were designed with CAD software. 3D-FEA was performed by image-based CAE software. Maximum and minimum values of biomechanical stability, MPS, and displacement distribution were compared in Champy and AO/ASIF plates made from commercially pure titanium grade 2 (cp-Ti) and a titanium-and-molybdenum (14...
January 4, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28121882/pedicled-temporalis-muscle-flap-for-craniofacial-reconstruction-a-35-year-clinical-experience-with-366-flaps
#15
Stefano Spanio di Spilimbergo, Paolo Nordera, Samir Mardini, Giusy Castiglione, Harvey Chim, Vittore Pinna, Massimo Brunello, Claudio Cusino, Squaquara Roberto, Ugo Baciliero
BACKGROUND: In the past 130 years, the temporalis muscle flap has been used for a variety of different indications. In this age of microsurgery and perforator flaps, the temporalis muscle flap still has many useful applications for craniofacial reconstruction. METHODS: Three hundred sixty-six temporalis muscle flaps were performed in a single center between 1978 and 2012. The authors divided the cases into two series-before and after 1994-because, after 1994, they started to perform free flap reconstructions, and indications for reconstruction with a temporalis muscle flap were changed RESULTS:: In the series after 1994, flaps were most commonly used for reconstruction of defects in the maxilla, mandible, and oropharynx, in addition to facial reanimation and filling of orbital defects...
February 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28118192/novel-treatment-planning-of-hemimandibular-hyperplasia-by-the-use-of-three-dimensional-computer-aided-design-and-computer-aided-manufacturing-technologies
#16
Muhanad M Hatamleh, Elizabeth Yeung, Jonas Osher, Chrisopher Huppa
RATIONALE AND AIM: Hemimandibular hyperplasia is characterized by an obvious overgrowth in the size of the mandible on one side, which can extend up to the midline causing facial asymmetry. Surgical resection of the overgrowth depends heavily on the skill and experience of the surgeon. This report describes a novel methodology of applying three-dimensional computer-aided-design and computer-aided-manufacturing principles in improving the outcome of surgery in 2 mandibular hyperplasia patients...
January 23, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28113257/automated-planning-with-multivariate-shape-descriptors-for-fibular-transfer-in-mandibular-reconstruction
#17
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/28109118/a-mandible-from-the-middle-pleistocene-hexian-site-and-its-significance-in-relation-to-the-variability-of-asian-homo-erectus
#18
Wu Liu, María Martinón-Torres, Yousuke Kaifu, Xiujie Wu, Reiko T Kono, Chun-Hsiang Chang, Pianpian Wei, Song Xing, Wanbo Huang, José María Bermúdez de Castro
OBJECTIVES: This study presents the first detailed morphological description and comparison of a Middle Pleistocene hominin mandibular fragment (PA 831) and associated teeth from the Hexian site in Eastern China. We aim to investigate where the Hexian mandible fits within the genus Homo variability in the light of an increased and better characterized Asian fossils record. METHODS: Comparative samples include Pleistocene Homo mandibles and teeth from Africa, Asia, and Europe, as well as earlier African hominins (Australopithecus and early Homo) and Holocene recent humans...
January 21, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28099975/functional-outcome-of-cad-cam-assisted-versus-conventional-microvascular-fibular-free-flap-reconstruction-of-the-mandible-a-retrospective-study-of-30-cases
#19
Lucas M Ritschl, Thomas Mücke, Andreas Fichter, Florian D Güll, Christopher Schmid, Jean Marc Pho Duc, Marco R Kesting, Klaus-Dietrich Wolff, Denys J Loeffelbein
Background Different advantages of virtually planned and guided mandibular reconstructions have been described. Functional analyses and comparisons with conventionally reconstructed patients. Methods We retrospectively analyzed 30 cases of mandibular reconstructions that involved virtually planned or conventional microvascular, fibular free flaps that occurred between April 2011 and December 2014 at a single center. The results were also compared with a healthy cohort of 30 participants. Axiographic measurements were performed postoperatively, and uni- and multivariate regressions analyses were performed to determine the association between possible predictor variables on functional outcome...
January 18, 2017: Journal of Reconstructive Microsurgery
https://www.readbyqxmd.com/read/28078198/multidisciplinary-approach-to-management-of-temporal-bone-giant-cell-tumor
#20
Taija K Nicoli, Riste Saat, Risto Kontio, Anna Piippo, Maija Tarkkanen, Jussi Tarkkanen, Jussi Jero
Background Giant cell tumors (GCTs) are rare osseous tumors that rarely appear in the skull. Methods We review the clinical course of a 28-year-old previously healthy woman with a complicated GCT. Results The reviewed patient presented with a middle cranial fossa tumor acutely complicated by reactive mastoiditis. Left tympanomastoidectomy was performed for drainage of the mastoiditis and for biopsies of the tumor. Due to the challenging tumor location, the patient was treated with denosumab, a fully humanized monoclonal antibody against receptor activator of nuclear factor kappa-B ligand, for 7 months, which resulted in significant preoperative tumor shrinkage...
July 2016: Journal of Neurological Surgery Reports
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