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Mandibular reconstruction

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https://www.readbyqxmd.com/read/29344134/a-novel-classification-system-for-the-evaluation-and-reconstruction-of-oral-defects-following-oncological-surgery
#1
Wei Wei Liu, Chu Yi Zhang, Jian Yin Li, Ming Fang Zhang, Zhu Ming Guo
Accurate evaluation of oral tissue defects following oncological surgery is necessary for the subsequent reconstruction. However, there is currently no effective classification system for oral defects in the clinical setting. The present study therefore developed a clinical classification system for the evaluation and reconstruction of oral defects. A retrospective cohort study was performed. A two-dimensional classification system based on coronal computed tomography/magnetic resonance imaging was developed and validated by 145 cases with oral defects...
December 2017: Oncology Letters
https://www.readbyqxmd.com/read/29340482/clear-cell-odontogenic-carcinoma-of-the-mandible-a-treatment-strategy
#2
Sabrina Ferreira, Leonardo Perez Faverani, Gabriel Mulinari Dos Santos, Everton Pontes Martins, Idelmo Rangel Garcia Júnior
Clear cell odontogenic carcinoma (CCOC) is a rare odontogenic tumor of the jaws, histologically characterized by the presence of agglomerates of cells with eosinophilic cytoplasm. The patient, a 62-year-old Caucasian woman, presented an intraosseous lesion in the mandibular symphysis. A clinical examination revealed a discrete volumetric increase with a hard consistency, palpable to extraoral and intraoral examinations. Imaging studies revealed an extensive radiolucent area, without defined limits, extending from the region of the right second premolar to the left canine...
January 15, 2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29335485/electron-beam-melting-in-the-fabrication-of-three-dimensional-mesh-titanium-mandibular-prosthesis-scaffold
#3
Rongzeng Yan, Danmei Luo, Haitao Huang, Runxin Li, Niu Yu, Changkui Liu, Min Hu, Qiguo Rong
The study was designed to fulfill effective work-flow to fabricate three-dimensional mesh titanium scaffold for mandibular reconstruction. The 3D titanium mesh scaffold was designed based on a volunteer with whole mandible defect. (1) acquisition of the CT data; (2) design with computer aided design (CAD) and finite element analysis (FEA). The pore size and intervals with the best mechanic strength was also calculated using FEA. (3) fabrication of the scaffold using electron beam melting (EBM); (4) implantation surgery...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29333780/-progress-in-exogenous-factors-affecting-the-growth-and-remodeling-of-condylar-process
#4
Peng Qiuping, Wu Jun
Condyle is a critical growth region of the mandible where mandible by endochondral ossification occurs. Condylar cartilage belongs to the secondary cartilage, which is not only affected by genetic factors but also by stress, drug intake, and other local factors. To promote the growth of the mandible, various exogenous and local factors were used to alter the biological environment of the condylar cartilage to stimulate endochondral ossification. This article reviews studies on the influence of exogenous factors on condylar growth and reconstruction...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29314144/bone-augmentation-followed-by-implant-surgery-in-the-edentulous-mandible-a-systematic-review
#5
REVIEW
R J de Groot, M A E M Oomens, T Forouzanfar, E A J M Schulten
INTRODUCTION: Long-standing loss of natural teeth in the mandible can lead to severe jaw atrophy and even mandibular fracture. There is no consensus on the best preprosthetic surgical treatment to reconstruct the atrophic edentulous mandible. The purpose of this review is to provide an overview of the existing literature and to give an evidence-based recommendation for bone grafting and future research. MATERIALS AND METHODS: This systematic review was conducted according to the PRISMA statement...
January 4, 2018: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/29304327/the-use-of-computer-aided-design-and-manufacturing-in-acute-mandibular-trauma-reconstruction
#6
George Kokosis, Edward H Davidson, Rachel Pedreira, Alexandra McMillan, Amir H Dorafshar
PURPOSE: Virtual surgical planning (VSP) with subsequent computer-aided design and manufacturing have proved efficacious in improving the efficiency and outcomes of a plethora of surgical modalities, including mandibular reconstruction and orthognathic surgery. PATIENTS AND METHODS: Five patients underwent complex mandibular reconstruction after traumatic injury using VSP from July 2016 to August 2017 at our institution. The Johns Hopkins University Hospital institutional review board approved the present study...
December 13, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29303857/reconstruction-of-a-compound-oromandibular-defect-by-means-of-chimeric-scapular-parascapular-free-flap-assisted-by-virtual-surgical-planning
#7
Josué Hernando, Antonio Aguilar-Salvatierra, Ignacio Osoitz Leizaola-Cardesa, Juan Antonio Rad, Amaya Vicuña, Rafael Gómez, Javier Martín, Gerardo Gómez-Moreno
BACKGROUND: Reconstruction of an oromandibular defect presents a considerable surgical challenge. But since the advent of microvascularized free flap reconstructive surgery, outcomes have improved significantly so that today almost any defect may be reconstructed. Recently, virtual surgical planning has reduced surgical time, the morbidity associated with surgery, and surgical precision. OBJECTIVE: This article reports a complex patient with a composite oromandibular defect...
January 4, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29289988/rerouting-the-internal-thoracic-pedicle-a-novel-solution-for-maxillofacial-reconstruction-in-vessel-depleted-situations-a-preliminary-anatomic-study
#8
François Morel, Frédéric Crampon, Jérôme Adnot, Pierre-Yves Litzler, Fabrice Duparc, Olivier Trost
PURPOSE: Microsurgical reconstruction in a vessel-depleted neck is a challenge due to the lack of reliable vessels in or nearby the host site. The use of the internal thoracic pedicle (ITP) by rib section or sparring is a limited option due to the small length of the pedicle of some flaps. However, in cardiac surgery, the internal thoracic artery (ITA) is widely used for myocardial revascularization, providing a long and versatile pedicle. We aimed at determining precise anatomical bases for the use of the ITP, approached by sternotomy and rerouted in the neck, as recipient vessels for free-flap facial reconstructions...
December 30, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29288289/anterolateral-thigh-flap-combined-with-reconstruction-plate-versus-double-free-flaps-for-composite-mandibular-reconstruction-a-propensity-score-matched-study
#9
Anaeze C Offodile, Jennifer An-Jou Lin, Kai-Ping Chang, Mohamed Abdelrahman, Hao-Wei Kou, Charles Yuen Yung Loh, Mario A Aycart, Huang-Kai Kao
OBJECTIVE: This study was designed to examine the comparative effectiveness of oromandibular defect reconstruction via anterolateral thigh flap and bridging plate (ALT only) versus simultaneous soft tissue and vascularized bone flap (DFF), with regards to long-term plate exposure and complications. METHODS: A propensity score-matched analysis of patients with an oncologic head and neck defect who underwent microvascular reconstruction was performed. Two surgical groups, i...
December 30, 2017: Annals of Surgical Oncology
https://www.readbyqxmd.com/read/29287661/time-dependent-behavior-of-porcine-periodontal-ligament-a-combined-experimental-numeric-in-vitro-study
#10
Thomas Johannes Knaup, Cornelius Dirk, Susanne Reimann, Ludger Keilig, Meike Eschbach, Heike Korbmacher-Steiner, Christoph Bourauel
INTRODUCTION: The aim of this study was to analyze the time-dependent in-vitro behavior of the periodontal ligament (PDL) by determining the material parameters using specimens of porcine jawbone. Time-dependent material parameters to be determined were expected to complement the results from earlier biomechanical studies. METHODS: Five mandibular deciduous porcine premolars were analyzed in a combined experimental-numeric study. After selecting suitable specimens (excluding root resorption) and preparing the measurement system, the specimens were deflected by a distance of 0...
January 2018: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/29283939/rabdomyosarcoma-of-the-mandible-an-uncommon-clinical-presentation
#11
Cleverton Roberto de Andrade, Guilherme Dos Santos Trento, Fabiano Jeremias, Elisa Maria Aparecida Giro, Marisa Aparecida Cabrini Gabrielli, Mario Francisco Real Gabrielli, Oslei Paes de Almeida, Valfrido Antonio Pereira-Filho
Rhabdomyosarcoma (RMS) is the most common soft tissue sarcoma in children and adolescents. Most patients present with a mass in the head and neck region, urogenital region, or with distal extremity involvement. The authors describe a challenging case of a 6-year-old male patient presenting with mandibular RMS. The clinical/radiographic/tomographic evaluations classified the tumor as an advanced stage (stage IV), with a mass of 6.0 cm involving the left side of the mandible and parotid region. The biopsy revealed round, spindled, and pleomorphic cells with hyperchromatic nuclei and rare larger rhabdomyoblasts with eosinophilic cytoplasm...
December 27, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29279767/3-dimensional-reconstruction-of-mandibular-canal-at-the-interforaminal-region-using-micro-computed-tomography-in-korean
#12
Yong Hyun Jeon, Chul Kwon Lee, Hee-Jung Kim, Jae-Heon Chung, Heung-Joong Kim, Sun-Kyoung Yu
PURPOSE: The purpose of this study was to identify the complex course of the mandibular canal using 3D reconstruction of microCT images and to provide the diagram for clinicians to help them understand at the interforaminal region in Korean. MATERIALS AND METHODS: Twenty-six hemimandibles obtained from cadavers were examined using microCT, and the images were reconstructed. At both the midpoint of mental foramen and the tip of anterior loop, the bucco-lingual position, the height from the mandibular inferior border, the horizontal distance between two points, and position relative to tooth site on the mandibular canal were measured...
December 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29275154/three-dimensional-growth-pattern-of-the-rat-mandible-revealed-by-periodic-live-micro-computed-tomography
#13
Hak-Jin Kim, Kyeong-Mee Park, Hye-Jin Tak, Ji Wook Choi, Sang-Hoon Kang, Wonse Park, Sang-Hwy Lee
OBJECTIVE: We wanted to evaluate the three-dimensional (3D) mandibular growth of Sprague-Dawley rats from 4th to 16th postnatal weeks with periodic and live micro-computed tomographic scanning. DESIGN: Twenty Sprague-Dawley rats were used for micro-CT scanning from 4th to 16th postnatal weeks. After 3D reconstruction of rat mandible, we performed the linear and angular measurements and the superimposition of the 3D models to evaluate the mandibular growth of rat...
December 16, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29260271/reconstruction-of-mandibular-contour-using-individualized-high-density-porous-polyethylene-medpor%C3%A2-implants-under-the-guidance-of-virtual-surgical-planning-and-3d-printed-surgical-templates
#14
Yu Wang, Yiqun Zhang, Zhen Zhang, Xiang Li, Jianwei Pan, Jihua Li
BACKGROUND: The mandibular contour plays a significant role in the beautiful and youthful look but the reconstruction remains a challenging problem. The objective of this study was to evaluate the use of individualized high-density porous polyethylene (Medpor®) implants for comprehensive reconstruction of mandibular contour with the aid of computer-aided design/computer-aided manufacturing (CAD/CAM). METHODS: From 2010 to 2014, 12 patients with mandibular contour deformities were enrolled in our retrospective study...
December 19, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/29258778/effects-of-deep-sedation-under-mechanical-ventilation-on-cognitive-outcome-in-patients-undergoing-surgery-for-oral-and-maxillofacial-cancer-and-microvascular-reconstruction
#15
Y Terada, S Inoue, M Konda, J Egawa, J Ueda, T Kirita, M Kawaguchi
OBJECTIVE: Cognitive impairment after intensive care unit (ICU) admission is becoming increasingly recognized. High-dose deep sedation has been suggested to play an important role in the development of cognitive impairment. However, the impact of heavy sedation as a single cause in the development of cognitive impairment in ICU patients remains unclear. In this study we investigated whether a three-day deep sedation protocol could reduce cognitive function in mechanically ventilated non-critical patients...
December 16, 2017: Medicina Intensiva
https://www.readbyqxmd.com/read/29244244/mineral-apposition-rates-in-coronal-dentine-of-mandibular-first-molars-in-soay-sheep-results-of-a-fluorochrome-labeling-study
#16
Patricia Kahle, Carsten Witzel, Uwe Kierdorf, Kai Frölich, Horst Kierdorf
We studied the spatio-temporal variation of mineral apposition rate (MAR) in postnatally formed coronal dentine of mandibular first molars from Soay sheep repeatedly injected with different fluorochromes. MARs declined along the cuspal to cervical crown axis, and from early to late formed dentine, i.e., from the dentine at the enamel-dentine-junction (EDJ) to the dentine adjacent to the dentine-pulp-interface (DPI). Highest mean MARs (about 21 µm/day) were recorded in cuspal dentine formed in the period of 28-42 days after birth...
December 15, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29243002/comprehending-the-three-dimensional-mandibular-morphology-of-facial-asymmetry-patients-with-mandibular-prognathism
#17
Hideki Kamata, Norihisa Higashihori, Hiroki Fukuoka, Momotoshi Shiga, Tatsuo Kawamoto, Keiji Moriyama
BACKGROUND: The purpose of this study was to elucidate the factors that cause facial asymmetry by comparing the characteristics of the mandibular morphology in patients with mandibular prognathism with or without facial asymmetry using three-dimensional computed tomography (3D-CT). METHODS: We studied 28 mandibular prognathism patients whose menton deviated by ≥ 4 mm from the midline (FA group, n = 14) and those with a < 4-mm deviation (NA group, n = 14)...
December 15, 2017: Progress in Orthodontics
https://www.readbyqxmd.com/read/29236278/head-and-neck-surgical-reconstruction-in-operation-iraqi-freedom-and-operation-enduring-freedom-afghanistan-a-systematic-review
#18
Samantha J Mikals, Joshua M Jabaut, Art A Ambrosio
Historically, head and neck injuries constituted 16 to 20% of all nonfatal combat injuries. However, advances in body and vehicle armor in the context of the use of ambushes and improvised explosive devices by enemy combatants have resulted in fewer fatalities from head and neck wounds, and thus the incidence of nonfatal head and neck injuries has risen to as high as 52%. Despite this increase, data regarding specific injury distributions, surgical cases, and approaches to repair are lacking in the current literature...
December 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/29233698/ex-corpore-linguae-a-cohort-analysis-after-a-unique-surgical-technique-in-oral-cancer-resection
#19
Jan-Falco Wilbrand, Daniel Schmermund, Michael Knitschke, Philipp Streckbein, Christopher Kähling, Heiko Kerkmann, Heidrun Schaaf, Hans-Peter Howaldt, Sebastian Böttger
OBJECTIVE: Resection of posteriorly located oral squamous cell carcinomas (OSCCs) remains challenging for head and neck surgeons. However, several surgical techniques, such as lip and mandibular splitting, as well as submental "visor drop-down" of intraoral soft tissues, have been proposed for this purpose. Merrick et al. suggested that a pedicled genial drop-down surgical approach should be used to resect dorsally located OSCCs. Our study investigated patient outcomes following this surgical procedure, as no previous study has analyzed long-term follow-up data...
November 21, 2017: Journal of Cranio-maxillo-facial 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
#20
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
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