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Mandibular reconstruction

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https://www.readbyqxmd.com/read/29141673/a-customized-fixation-plate-with-novel-structure-designed-by-topological-optimization-for-mandibular-angle-fracture-based-on-finite-element-analysis
#1
Yun-Feng Liu, Ying-Ying Fan, Xian-Feng Jiang, Dale A Baur
BACKGROUND: The purpose of this study was to design a customized fixation plate for mandibular angle fracture using topological optimization based on the biomechanical properties of the two conventional fixation systems, and compare the results of stress, strain and displacement distributions calculated by finite element analysis (FEA). METHODS: A three-dimensional (3D) virtual mandible was reconstructed from CT images with a mimic angle fracture and a 1 mm gap between two bone segments, and then a FEA model, including volume mesh with inhomogeneous bone material properties, three loading conditions and constraints (muscles and condyles), was created to design a customized plate using topological optimization method, then the shape of the plate was referenced from the stress concentrated area on an initial part created from thickened bone surface for optimal calculation, and then the plate was formulated as "V" pattern according to dimensions of standard mini-plate finally...
November 15, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29130414/occlusal-angles-of-equine-incisors
#2
Laura Listmann, Patricia Schrock, Klaus Failing, Carsten Staszyk
The angulation of equine incisors is frequently used as a parameter for dental corrections. However, the term incisor angle is only vaguely defined, and no studies exist presenting a series of reliable measurements in individual incisors of multiple horses. The aim of this study was to establish an exact method to determine incisor angles and to test whether clinically accessible landmarks (facial crest and bars) are suitable to estimate incisor angles. Eighteen horses were used to create 3-dimensional (3D) reconstructions of the skulls from computed tomography (CT) data sets...
December 2017: Journal of Veterinary Dentistry
https://www.readbyqxmd.com/read/29128598/histological-and-radiological-evaluation-of-subcutaneous-implants-in-mouse-of-a-3d-printable-material-fulcure-720-and-experimental-application-in-mandibular-reconstruction
#3
J Megías Barrera, L García-Consuegra, A Novoa, S Costilla, S Junquera, G Ascani
INTRODUCTION: The aim of this study was to evaluate the bioactivity of FullCure compared to porous polyethylene implants (Medpor) in rats prior to custom-made scaffold support manufacturing for mandible segmental defects (MSD) reconstruction in sheep. METHODS: 12 Fullcure and Medpor laminaes were implanted in the left and right dorsum respectively of 6 wistar rats. Toxicity was assessed by skin, kidney and liver histopathology 3 months post-implantation. Computed Tomography (CT) was carried out in order to assess radiological differences between implants...
November 8, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29126697/use-of-automated-learning-techniques-for-predicting-mandibular-morphology-in-skeletal-class-i-ii-and-iii
#4
Tania Camila Niño-Sandoval, Sonia V Guevara Pérez, Fabio A González, Robinson Andrés Jaque, Clementina Infante-Contreras
BACKGROUND: The prediction of the mandibular bone morphology in facial reconstruction for forensic purposes is usually performed considering a straight profile corresponding to skeletal class I, with application of linear and parametric analysis which limit the search for relationships between mandibular and craniomaxillary variables. OBJECTIVE: To predict the mandibular morphology through craniomaxillary variables on lateral radiographs in patients with skeletal class I, II and III, using automated learning techniques, such as Artificial Neural Networks and Support Vector Regression...
October 12, 2017: Forensic Science International
https://www.readbyqxmd.com/read/29123190/feeding-capability-in-the-extinct-giant-siamogale-melilutra-and-comparative-mandibular-biomechanics-of-living-lutrinae
#5
Z Jack Tseng, Denise F Su, Xiaoming Wang, Stuart C White, Xueping Ji
At 50 kg in estimated weight, the extinct Siamogale melilutra is larger than all living otters, and ranks among the largest fossil otters. The biomechanical capability of S. melilutra jaws as related to their large size is unknown but crucial to reconstructing the species' potentially unique ecological niche. Here we compare the mandibular biomechanics of S. melilutra using engineering-based performance measures against ten extant otter biomechanical models. Despite a wide range of feeding preferences from durophagy to piscivory, living otter species exhibit a linear relationship between mandible stiffness and volume, as expected in isometric model scaling...
November 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29116495/mandibular-kinematics-and-maximum-voluntary-bite-force-following-segmental-resection-of-the-mandible-without-or-with-reconstruction
#6
Sabine S Linsen, Annina Oikonomou, Markus Martini, Marcus Teschke
OBJECTIVES: The purpose was to analyze mandibular kinematics and maximum voluntary bite force in patients following segmental resection of the mandible without and with reconstruction (autologous bone, alloplastic total temporomandibular joint replacement (TMJ TJR)). MATERIALS AND METHODS: Subjects operated from April 2002 to August 2014 were enrolled in the study. Condylar (CRoM) and incisal (InRoM) range of motion and deflection during opening, condylar retrusion, incisal lateral excursion, mandibular rotation angle during opening, and maximum voluntary bite force were determined on the non-affected site and compared between groups...
November 7, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29115677/applicability-of-3d-dental-reconstruction-in-cervical-odontometrics
#7
Seyedeh M Kazzazi, Elena F Kranioti
OBJECTIVES: The objective of this study was to assess the accuracy, reliability, and reproducibility of computed tomography (CT) images in measuring cervical mesiodistal and buccolingual tooth sizes, by comparing the values obtained by 3D virtual models from CT images with those obtained using digital calipers. MATERIALS AND METHODS: In total, 530 maxillary and mandibular teeth of 51 individuals from two Iron Age sites were scanned using a Siemens Somatom sensation 64-slice computed tomography machine, and the images were reconstructed and measured...
November 8, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/29114352/bone-allograft-an-option-for-total-mandibular-reconstruction
#8
Masoud Fallahi Motlagh, Mohamad Bayat, Siamak Naji
Total mandibular reconstruction is one of the most challenging modalities in maxillofacial surgery. In this article, we try to introduce a method of total mandible reconstruction. We report a 25-year-old male patient with complete involvement of the mandible by Langerhans cell tumor. The patient underwent total mandibulectomy and reconstruction with bone allograft harvested from a donor who had died the day before. The patient has good functional and aesthetic results in a long time. It seems that bone allograft can be a good alternative to other methods in total mandibular reconstruction...
December 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/29113176/stereolithographic-model-assisted-reconstruction-of-the-mandibular-condyle-with-a-vascularized-fibular-flap-following-hemimandibulectomy-evaluation-of-morphological-and-functional-outcomes
#9
Hitoshi Yoshimura, Shinpei Matsuda, Seigo Ohba, Yoshiki Minegishi, Kunihiro Nakai, Shigeharu Fujieda, Kazuo Sano
The vascularized fibular flap is one of the standard treatment choices for the reconstruction of the mandible; however, the consequences of condylar restoration have not previously been reported. The use of three-dimensional models allows for a more predictable reconstruction. The purpose of the present study was to assess the outcome of stereolithographic model-assisted reconstruction of the mandibular condyle with a vascularized fibular flap. A total of 5 patients underwent mandibular resection including the condyle and immediate reconstruction with a vascularized fibular flap...
November 2017: Oncology Letters
https://www.readbyqxmd.com/read/29109943/evaluation-of-mandibular-lingula-and-foramen-location-using-3-dimensional-mandible-models-reconstructed-by-cone-beam-computed-tomography
#10
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/29109847/the-pull-through-technique-a-viable-option-for-preserving-the-inferior-alveolar-nerve-during-surgical-resection
#11
REVIEW
Gustavo Boehmer Leite, Suelen Cristina Sartoretto, Fernando César Amazonas Lima, Mônica Calasans-Maia, Rafael Seabra Louro
The aim of this study was to present a new surgical technique used to remove benign mandibular tumors with minimal damage to the inferior alveolar nerve. The pull-through technique was shown using an ameloblastoma surgical resection as an example. This technique consisted in the reconstruction of the lower jaw associating the resection of the lesion with nerve repair at the same surgical time. The resection was performed using the pull-through technique and the inferior alveolar nerve was preserved. After 6 months, the patient presented a recovery of approximately 80% of sensory function...
December 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/29109844/porcine-urinary-bladder-extracellular-matrix-for-the-salvage-of-fibula-free-flap-skin-paddle-technical-note-and-description-of-a-case
#12
REVIEW
Rabie M Shanti, Ryan J Smart, Andrew Meram, David Kim
This report establishes a novel application of a commercially available porcine urinary bladder extracellular matrix, MatriStem (ACell, Inc., Columbia, MD), in the salvage of partial loss of the skin paddle of a fibula osteoseptocutaneous free flap that was utilized for mandibular reconstruction.
December 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/29109841/mandibular-reconstruction-with-lateral-tibial-bone-graft-an-excellent-option-for-oral-and-maxillofacial-surgery
#13
Ana Lucia Carpi Miceli, Livia Costa Pereira, Thiago da Silva Torres, Mônica Diuana Calasans-Maia, Rafael Seabra Louro
Autogenous bone grafts are the gold standard for reconstruction of atrophic jaws, pseudoarthroses, alveolar clefts, orthognathic surgery, mandibular discontinuity, and augmentation of sinus maxillary. Bone graft can be harvested from iliac bone, calvarium, tibial bone, rib, and intraoral bone. Proximal tibia is a common donor site with few reported problems compared with other sites. The aim of this study was to evaluate the use of proximal tibia as a donor area for maxillofacial reconstructions, focusing on quantifying the volume of cancellous graft harvested by a lateral approach and to assess the complications of this technique...
December 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/29100719/contribution-of-3d-printing-to-mandibular-reconstruction-after-cancer
#14
A Dupret-Bories, S Vergez, T Meresse, F Brouillet, G Bertrand
Three-dimensional (3D) printing is booming in the medical field. This technology increases the possibilities of personalized treatment for patients, while lowering manufacturing costs. To facilitate mandibular reconstruction with fibula free flap, some companies propose cutting guides obtained by CT-guided moulding. However, these guides are prohibitively expensive (€2,000 to €6,000). Based on a partnership with the CNRS, engineering students and a biomedical company, the authors have developed cutting guides and 3D-printed mandible templates, deliverable in 7days and at a lower cost...
October 31, 2017: European Annals of Otorhinolaryngology, Head and Neck Diseases
https://www.readbyqxmd.com/read/29090194/the-pros-and-cons-of-computer-aided-surgery-for-segmental-mandibular-reconstruction-after-oncological-surgery
#15
REVIEW
Hyun Ho Han, Hak Young Kim, Jun Yong Lee
Computer-aided surgery (CAS) started being used for head and neck reconstruction in the late 2000s. Its use represented a paradigm shift, changing the concept of head and neck reconstruction as well as mandible reconstruction. Reconstruction using CAS proceeds through 4 phases: planning, modeling, surgery, and evaluation. Thus, it can overcome a number of trial-and-error issues which may occur in the operative field and reduce surgical time. However, if it is used for oncologic surgery, it is difficult to evaluate tumor margins during tumor surgery, thereby restricting pre-surgical planning...
September 2017: Arch Craniofac Surg
https://www.readbyqxmd.com/read/29089549/mesiolingual-root-rotation-for-horizontal-mandibular-third-molar-extraction-position-classification-and-surgical-simulation
#16
Zhou-Xi Ye, Chi Yang
Extracting horizontal mandibular 3rd molars face considerable difficulty due to the large bone and adjacent tooth resistances. This study aims at evaluating the effectiveness of a novel method-mesiolingual root rotation to extract wisdom teeth of this type. In this study, 73 horizontal teeth extracted using piezosurgery were reviewed and classified based on impaction depth: position I, II, III refers to the highest portion of the crown on a level with upper 1/3, middle 1/3, lower 1/3 of the 2rd molar's root...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29080960/protocol-for-mandibular-reconstruction-with-zygomatic-implants-zygomatic-mandibular-implant
#17
Ruben Muñoz, Golaszewski Gajos, Jose Bladimir, Diaz Carvajal, Alvaro Luis, Grace Del Valle Speranza
INTRODUCTION: This study describes a modified protocol using transmandibular zygomatic implants with immediate occlusal loading for the comprehensive dental rehabilitation of previously reconstructed mandibular defects and reports preliminary results of this modified protocol. MATERIALS AND METHODS: Fifteen patients (6 female and 9 male), with a mean of age 40.26 years (range 12 to 68 years), had previously undergone immediate mandibular reconstruction using either autologous bone grafting, bone transport, or microvascular free-flap reconstruction for a variety of diagnoses...
October 28, 2017: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29075779/reconstruction-the-final-dimension-in-head-and-neck-surgery-the-2017-hayes-martin-lecture
#18
Mark K Wax
The Hayes Martin lecture is dedicated to a giant who was essential to developing the surgical management of patients with head and neck cancer. Since that time, advents in anesthesia, intensive care, and improved diagnostic abilities have improved our ability to surgically manage and treat head and neck cancer. The original paradigm of resection, reconstruction, and rehabilitation was formulated as we endeavored to develop paradigms of treatment for our patients. We have maximized our resective and reconstructive abilities...
October 26, 2017: JAMA Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/29075412/low-cost-method-for-obtaining-medical-rapid-prototyping-using-desktop-3d-printing-a-novel-technique-for-mandibular-reconstruction-planning
#19
Ignacio Velasco, Soheil Vahdani, Hector Ramos
BACKGROUND: Three-dimensional (3D) printing is relatively a new technology with clinical applications, which enable us to create rapid accurate prototype of the selected anatomic region, making it possible to plan complex surgery and pre-bend hardware for individual surgical cases. This study aimed to express our experience with the use of medical rapid prototype (MRP) of the maxillofacial region created by desktop 3D printer and its application in maxillofacial reconstructive surgeries...
September 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29074445/fibrous-condylar-dysplasia-resection-and-reconstruction-with-a-custom-made-tmj-prosthesis-using-virtual-surgical-planning
#20
M Fernández-Ferro, J Fernández-Sanromán, A Costas-López, A López-Betancourt
The main objective of this article is to describe the indications for custom-made alloplastic reconstruction of the temporomandibular joint (TMJ) using the new techniques of virtual surgical planning and computer-aided design/computer-aided manufacturing (CAD/CAM) technology through the study of a clinical case and an updated review of the literature. The patient was a 45-year-old male with a fast-growing condylar dysplasia that produced a progressive facial deformity with limited mandibular mobility, which required a radical resection...
October 23, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
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