INDIVIDUALIZED SURGICAL GUIDANCE FOR MANDIBULAR RECONSTRUCTION USING 3D FEA/PRINTING TECHNOLOGIES

2017 ◽  
Vol 17 (07) ◽  
pp. 1740030 ◽  
Author(s):  
YADONG CHEN ◽  
TIANXING GONG ◽  
BOXUAN SUN ◽  
DEHAO SHANG
Keyword(s):  
3D Printing ◽  
Donor Site ◽  
Operation Time ◽  
Mandibular Reconstruction ◽  
Element Analysis ◽  
Engineering Technology ◽  
Surgical Guidance ◽  
3D Fea ◽  
Free Fibula ◽  
3D Printed

The state-of-the-art surgery makes it possible to transfer tissue from donor site to recipient sites for reconstruction. In particular, free fibula becomes one of the common methods to repair mandibular (i.e., lower jawbone) defects. To guide one individual surgery, the 3D printing and finite element analysis (FEA) technologies have been employed in this study. The personalized model of titanium plate with screws was designed on the basis of computed tomography data with the help of the reverse engineering technology and 3D computational model via the PRO/E software. In order to refine the model, FEA results were used to guide the operation plan. Finally, the 3D-printed scaffold was used in the surgery. In conclusion, 3D printing technology and FEA for mandibular reconstruction surgery guidance can achieve good matches among fibula, human mandible and titanium plates, restore mandible functions, reduce the operation time and improve the success rate of surgery. Furthermore, this technology gives more freedom for physicians to discuss surgical plans with patients.

Simulation and Validation of Fully 3D Printed Soft Actuators

2020 ◽  
Author(s):  
Steffi Torres ◽  
Julio San Martin ◽  
Brittany Newell ◽  
Jose Garcia
Keyword(s):  
3D Printing ◽  
Thermoplastic Polyurethane ◽  
Pharmaceutical Products ◽  
Element Analysis ◽  
Strain Behavior ◽  
Fea Model ◽  
First Case ◽  
3D Printed ◽  
Soft Actuators ◽  
Robotic Applications

Abstract Flexible actuators are a growing class of devices implemented in soft robotic applications, medical devices and processes involving food and pharmaceutical products. Such actuators have traditionally been manufactured using casting processes or other conventional methods requiring more than one fabrication step. The arrival of flexible 3D printing materials and 3D printing techniques has facilitated the creation of these flexible actuators via additive manufacturing. The work presented in this article displays the analytical characterization and experimental validation of two materials and two actuator designs. The first case presents a finite element analysis (FEA) simulated model of a bellows actuator using a photocurable flexible resin (TangoPlus FLX930) and studies the effect of printing orientation on the simulation. The simulation used a 5 parameter Mooney-Rivlin model to predict the strain behavior of the actuator under hydrostatic pressure. A second case is presented where a Thermoplastic Polyurethane actuator was 3D printed and simulated using the same FEA model and a second calibration of the Mooney-Rivlin 5 parameter model. In both cases experimental data was used to calibrate and validate the simulation. The resulting simulated strain was consistent when the printing orientation of actuators was parallel (0 degrees) to the strain direction of the actuators. Results were less consistent when a print orientation of 45 degrees was applied.

Switchable Bistability in 3D Printed Shells With Bio-Inspired Architectures and Spatially Distributed Pre-Stress

2018 ◽  
Author(s):  
Karl Jin Ang ◽  
Katherine S. Riley ◽  
Jakob Faber ◽  
Andres F. Arrieta
Keyword(s):  
3D Printing ◽  
Room Temperature ◽  
Fused Deposition Modeling ◽  
Element Analysis ◽  
Fused Deposition ◽  
Spatially Distributed ◽  
Deposition Modeling ◽  
3D Printed ◽  
And Control ◽  
Careful Design

Using fused deposition modeling (FDM) 3D printing, we combine a bio-inspired bilayer architecture with distributed pre-stress and the shape memory behavior of polylactic acid (PLA) to manufacture shells with switchable bistability. These shells are stiff and monostable at room temperature, but become elastic and bistable with fast morphing when heated above their glass transition temperature. When cooled back down, the shells retain the configuration they were in at the elevated temperature and return to being stiff and monostable. These programmed deformations result from the careful design and control of how the filament is extruded by the printer and therefore, the resulting directional pre-stress. Parameter studies are presented on how to maximize the pre-stress for this application. The shells are analyzed using nonlinear finite element analysis. By leveraging the vast array of geometries accessible with 3D printing, this method can be extended to complex, multi-domain shells, including bio-inspired designs.

scholarly journals Mandibular Reconstruction with Free Fibula Flap: Experience at Hayatabad Medical Complex, Peshawar

2019 ◽  
Vol 8 (4) ◽  
pp. 198-202
Author(s):  
Syed Asif Shah ◽  
Irfan Ullah ◽  
Muhammad Bilal ◽  
Mohammad Hamayun Shinwari ◽  
Adeeba Ahmad ◽  
...  
Keyword(s):  
Success Rate ◽  
Donor Site ◽  
Graft Loss ◽  
Tumor Resection ◽  
Mandibular Reconstruction ◽  
Diabetic Patients ◽  
Free Fibula Flap ◽  
Skin Paddle ◽  
Fibula Flap ◽  
Free Fibula

Background: Mandibular defects may result from trauma, infections, cancer ablation or radiation necrosis. These defects may vary according to the content and nature of the tissues that require reconstruction. The objective of this study was to evaluate the outcome of vascularised free fibula flap for mandibular reconstruction in terms of flap success rate and complications.Material and Methods: This prospective clinical study was carried out at Department of Plastic Surgery, Hayatabad Medical Complex, Peshawar from January 2014 to December 2018. The study included patients of either gender who underwent mandibular reconstruction with free fibula oseteocutaneous flap during the study period. Diabetic patients with underlying vascular pathologies and cachectic patients were excluded from the study.Results: There were 56 patients with 38 males and 18 females. Their age ranged from 24-66 years with a mean age of 36 years. The mandibular defects resulted from various etiologies and included: Squamous cell carcinoma (n=27, 48.21%), Giant cell granuloma (n=3; 5.35%), Ameloblastoma (n=2; 3.57%), Road traffic accidents (n=10; 17.85%), Firearm injury (n=9; 16%), Bomb blast injury (n=3; 5.35%) and osteoradionecrosis (n=2; 3.57%). Primary reconstruction of the mandibular defects was performed in 44 patients, whereas delayed reconstruction was performed in 12 patients. Out of the 56 flaps, 49 flaps survived completely. Our share of complications was as follows: Wound infections (n=13; 23.21%), Skin graft loss at donor site (n=5; 8.95%), Complete flap loss (n=4; 7.14%), Orocutaneous fistulae (n=3; 5.35%), Ankle instability (n=2; 3.57%), Skin paddle necrosis (n=1; 1.78%) and sensory deficit distal to donor site (n=1; 1.78%).Conclusions: Microvascular free fibula is a reliable tool for mandibular reconstruction following tumor resection or trauma. The flap has a high success rate and relatively fewer complications.

Fast and economical protocol for in-house virtual planning and 3D-printed surgical templates in mandibular reconstruction

2020 ◽  
Vol 4 (2) ◽  
pp. 83-90
Author(s):  
Syahir Hassan ◽  
Md Arad Jelon ◽  
Nur Ikram Hanim Abd Rahim ◽  
Mohammad Adzwin Yahya ◽  
Norhayati Omar
Keyword(s):  
3D Printing ◽  
Fused Deposition Modeling ◽  
Case Series ◽  
Mandibular Reconstruction ◽  
Titanium Plate ◽  
Virtual Planning ◽  
Planning Stage ◽  
Fused Deposition ◽  
3D Printed ◽  
Surgical Templates

In this work, a case series consisting of mandibular reconstruction with free fibula flap in ameloblastic carcinoma, pathological mandibular fracture and recontouring of mandibular angle hyperplasia that were treated successfully using fast and economical in-house virtual planning and 3D-printing protocol has been presented. Pre-operatively, the design of the reconstructed mandibular model and surgical templates were carried out, with the help of two types of free software. As the next step, all designed 3D hardware tools were printed using affordable fused deposition modeling desktop 3D printer. A 3D-printed reconstructed mandibular model was used for titanium plate bending. Our findings have illustrated that it necessitates an average of 5 h 29 min per case from virtual planning stage until the 3D printing of all 3D hardware tools is completed. The average cost for 3D-printed hardware tools and titanium plate per case is only $203.42.

scholarly journals Application of 3D Printing in the Surgical Planning of Trimalleolar Fracture and Doctor-Patient Communication

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Long Yang ◽  
Xian-Wen Shang ◽  
Jian-Nan Fan ◽  
Zhi-Xu He ◽  
Jian-Ji Wang ◽  
...  
Keyword(s):  
3D Printing ◽  
Operation Time ◽  
Patient Communication ◽  
Intraoperative Blood Loss ◽  
Trimalleolar Fractures ◽  
Physician Patient Communication ◽  
Group A ◽  
3D Printed ◽  
Group B ◽  
Physician Patient

To evaluate the effect of 3D printing in treating trimalleolar fractures and its roles in physician-patient communication, thirty patients with trimalleolar fractures were randomly divided into the 3D printing assisted-design operation group (Group A) and the no-3D printing assisted-design group (Group B). In Group A, 3D printing was used by the surgeons to produce a prototype of the actual fracture to guide the surgical treatment. All patients underwent open reduction and internal fixation. A questionnaire was designed for doctors and patients to verify the verisimilitude and effectiveness of the 3D-printed prototype. Meanwhile, the operation time and the intraoperative blood loss were compared between the two groups. The fracture prototypes were accurately printed, and the average overall score of the verisimilitude and effectiveness of the 3D-printed prototypes was relatively high. Both the operation time and the intraoperative blood loss in Group A were less than those in Group B (P<0.05). Patient satisfaction using the 3D-printed prototype and the communication score were9.3±0.6points. A 3D-printed prototype can faithfully reflect the anatomy of the fracture site; it can effectively help the doctors plan the operation and represent an effective tool for physician-patient communication.

scholarly journals Finite Element Analysis of 3D Printed Aircraft Wing

10.29007/hp53 ◽  
2019 ◽  
Author(s):  
Julian Rogers ◽  
Hormoz Zareh
Keyword(s):  
Carbon Fiber ◽  
3D Printing ◽  
Complex Geometry ◽  
Fiber Composite ◽  
Carbon Fiber Composite ◽  
Element Analysis ◽  
Aircraft Wings ◽  
Aircraft Performance ◽  
3D Printed ◽  
Composite Wing

3D printing has allowed complex designs to be produced that were impossible to create using conventional manufacturing processes. Aircraft wings are optimized as much as possible given manufacturability considerations, but more complex geometry could provide the same strength for less weight, increasing aircraft performance. Although carbon fiber composites are some of the best known materials for conventional optimized aircraft wings, current 3D printing technology cannot produce this material. Instead, it is currently limited to metals and polymers. To determine if the more complex geometry which can be produced by 3D printing can offset the material limitations, a carbon fiber composite wing and a redesigned, 3D printed 7075-T6 aluminum wing were compared using Finite Element Analysis. The unoptimized 3D printed aluminum wing had a superior safety factor against fracture/yielding (1,109% higher) and buckling resistance (127.3% higher), but at the cost of a 23.99% mass increase compared to the optimized carbon fiber composite wing. If the 3D printed aluminum wing had been optimized to provide the same safety factor against fracture/yielding and buckling resistance as the carbon fiber composite wing, it is anticipated that the resulting design would be significantly lighter, thus increasing aircraft performance.

scholarly journals Free Revascularized Fibula Graft for Reconstruction of Mandibular Continuity Defects

2014 ◽  
Vol 41 (1) ◽  
pp. 45-49
Author(s):  
QB Rahman ◽  
R Karmakar ◽  
M Aftabuddin
Keyword(s):  
Average Length ◽  
Donor Site ◽  
Maxillofacial Surgery ◽  
Mandibular Reconstruction ◽  
Oral And Maxillofacial Surgery ◽  
Skin Paddle ◽  
Odontogenic Tumours ◽  
Fibula Graft ◽  
Vascularized Fibula ◽  
Free Fibula

Mandibular reconstruction represents a challenge to the oral and maxillofacial surgeon and has been revolutionized by the modern microvascular techniques Objective: To evaluate the usefulness of the free vascularized fibula graft for reconstruction of discontinuity defects of Mandible after resections of benign aggressive odontogenic tumours. The results of 7 vascularized free fibula graft without a skin paddle that were used for mandibular reconstruction is presented. The "double barrel" technique was used in 1 case. The donor site was closed directly in all cases. All procedures were performed by the same surgical team in oral and Maxillofacial Surgery department of BSMMU and Health & Hope Hospital from January, 2006 to December 2011. A total of patients (3 males, 4 females) were treated. All flaps except 1 were viable. Success rate was 85.71% .The average length of the fibula graft was 10.96 cm, and the number of osteotomies ranged from 0 to 3. There were no long-term functional complications in the lower leg. The fibula flap provides a successful bone graft for mandibular restoration with an acceptably low complication rate. DOI: http://dx.doi.org/10.3329/bmj.v41i1.18782 Bangladesh Medical Journal 2012 Vol. 41 No. 1; 45-49

scholarly journals Optimized Unidirectional and Bidirectional Stiffened Objects for Minimum Material Consumption of 3D Printing

Mathematics ◽  
2021 ◽  
Vol 9 (21) ◽  
pp. 2835
Author(s):  
Anzong Zheng ◽  
Zaiping Zhu ◽  
Shaojun Bian ◽  
Jian Chang ◽  
Habibollah Haron ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
3D Printing ◽  
Optimization Design ◽  
Industrial Applications ◽  
Material Consumption ◽  
Element Analysis ◽  
Industrial Sectors ◽  
Stiffened Structures ◽  
3D Printed

3D printing, regarded as the most popular additive manufacturing technology, is finding many applications in various industrial sectors. Along with the increasing number of its industrial applications, reducing its material consumption and increasing the strength of 3D printed objects have become an important topic. In this paper, we introduce unidirectionally and bidirectionally stiffened structures into 3D printing to increase the strength and stiffness of 3D printed objects and reduce their material consumption. To maximize the advantages of such stiffened structures, we investigated finite element analysis, especially for general cases of stiffeners in arbitrary positions and directions, and performed optimization design to minimize the total volume of stiffened structures. Many examples are presented to demonstrate the effectiveness of the proposed finite element analysis and optimization design as well as significant reductions in the material costs and stresses in 3D printed objects stiffened with unidirectional and bidirectional stiffeners.

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