scholarly journals Surface Modeling from 2D Contours with an Application to Craniofacial Fracture Construction

Mathematics ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 1246
Author(s):  
Abdul Majeed ◽  
Muhammad Abbas ◽  
Kenjiro T. Miura ◽  
Mohsin Kamran ◽  
Tahir Nazir
Keyword(s):  
Cross Sections ◽  
Bone Fractures ◽  
Clinical Skills ◽  
Parietal Bone ◽  
Radiological Imaging ◽  
Facial Fractures ◽  
Shape Parameters ◽  
Maxillofacial Region ◽  
Ball Surface ◽  
C2 Continuity

Treating trauma to the cranio-maxillofacial region is a great challenge and requires expert clinical skills and sophisticated radiological imaging. The aim of reconstruction of the facial fractures is to rehabilitate the patient both functionally and aesthetically. Bio-modeling is an important tool for constructing surfaces using 2D cross sections. The aim of this manuscript was to show 3D construction using 2D CT scan contours. The fractured part of the cranial vault were constructed using a Ball curve with two shape parameters, later the 2D contours were flipped into 3D with an equidistant z component. The surface created was represented by a bi-cubic rational Ball surface with C2 continuity. At the end of this article, we present two real cases, in which we had constructed the frontal and parietal bone fractures using a bi-cubic rational Ball surface. The proposed method was validated by constructing the non-fractured part.

Structural Optimization of the Telescopic Boom of a Certain Type of Truck-Mounted Crane

2014 ◽  
Vol 548-549 ◽  
pp. 383-388
Author(s):  
Zhi Wei Chen ◽  
Zhe Cui ◽  
Yi Jin Fu ◽  
Wen Ping Cui ◽  
Li Juan Dong ◽  
...  
Keyword(s):  
Finite Element ◽  
Static Analysis ◽  
Cross Sections ◽  
Optimization Design ◽  
Structural Parameters ◽  
Vertical Direction ◽  
Element Model ◽  
Shape Parameters ◽  
Conventional Design ◽  
Design Variables

Parametric finite element model for a commonly used telescopic boom structure of a certain type of truck-mounted crane has been established. Static analysis of the conventional design configuration was performed first. And then an optimization process has been carried out to minimize the total weight of the telescopic structures. The design variables include the geometric shape parameters of the cross-sections and the integrated structural parameters of the telescopic boom. The constraints include the maximum allowable equivalent stresses and the flexure displacements at the tip of the assembled boom structure in both the vertical direction and the circumferential direction of the rotating plane. Compared with the conventional design, the optimization design has achieved a significant weight reduction of up to 24.3%.

Analysis of the lower jaw exoskeleton in finite element programs

2021 ◽  
pp. 88-92
Author(s):  
D. Yu. D’yachenko ◽  
A. A. Vorob’ev ◽  
Iu. A. Makedonova ◽  
О. N. Kurkina ◽  
S. V. D’yachenko ◽  
...  
Keyword(s):  
Finite Element ◽  
External Fixation ◽  
3D Model ◽  
Bone Fractures ◽  
Maxillofacial Region ◽  
Lower Jaw ◽  
Fixation Devices ◽  
Bone Fragments ◽  
External Fixation Device ◽  
Medical University

A special place in the methods of surgical treatment of bone fractures is occupied by transosseous osteosynthesis using external fixation devices of various designs.Objective: to analyze the lower jaw exoskeleton in finite element programs.Materials and research methods. During the research, 36 human lower jaws were involved from the museum of the Department of Oper-ative Surgery and Topographic Anatomy of the Volgograd State Medical University. They were scanned in 3D. All obtained images were loaded into a virtual scene reconstruction program. Fractures of the lower jaws in the corner area were modeled, an apparatus for external fixation of the lower jaw exoskeleton was installed, and the chewing load on the lower jaw was simulated. The place of application of the force was an area on a small fragment of a repositioned 3D model of the mandibular bone corresponding to the place of attachment of the masseter muscle. The evaluation of virtual studies was carried out according to the results of the stress-strain states of the bones and apparatus, the schedule of displacements of objects and the results of the analysis of the safety factor.Research results and discussion. In the course of evaluating the virtual placement of the mini-fixator wires of the apparatus for external fixation of the lower jaw exoskeleton, it was revealed that the main load is applied to the mini-fixator wires on a large fragment and the bone in the area of the wires. For the possibility of precise positioning of the osteofixers of the external fixation device, a device for the safe installation of the spokes of the lower jaw exoskeleton was also developed.Conclusion. Thus, on the basis of computer mathematical analysis, it can be argued that the developed design of the apparatus for external fixation of the lower jaw exoskeleton works under conditions of the maxillofacial region, performs reposition and fixation of bone fragments of the lower jaw under conditions of chewing functioning of the restored fracture of the lower jaw.

scholarly journals External Fixation of Unstable, “Flail” Nasal Fractures

2012 ◽  
Vol 5 (2) ◽  
pp. 99-105 ◽  
Author(s):  
George E. Anastassov ◽  
Ali Payami ◽  
Zain Manji
Keyword(s):  
External Fixation ◽  
Closed Reduction ◽  
Nasal Septum ◽  
Bone Fractures ◽  
Nasal Bone ◽  
Facial Fractures ◽  
Kirschner Wires ◽  
Nasal Bones ◽  
External Stabilization ◽  
Nasal Fractures

Nasal bone fractures are the most common among facial fractures. Usually these are adequately treated with closed reduction and internal and/or external stabilization with splints. However, there are clinical situations where the nasal bones are severely displaced, the nasal septum fractured and displaced, or there are external drape lacerations which preclude the use of nasal splints. If the nasal bones are reducible but unstable we consider them “flail” and in this case transmucosal, endonasal Kirschner wires are used for dorsal support until sufficient healing occurs. The technique is simple, quick, and predictable and causes minimal discomfort to the patients.

scholarly journals Frontal bone fractures - a report of three different methods of fixation: a case series

2017 ◽  
Vol 4 (9) ◽  
pp. 3162
Author(s):  
Surya Rao Rao Venkata Mahipathy ◽  
Alagar Raja Durairaj ◽  
Narayanamurthy Sundaramurthy ◽  
James Solomon Jesudasan
Keyword(s):  
Bone Fractures ◽  
Traumatic Events ◽  
Case Series ◽  
Frontal Bone ◽  
Maxillofacial Region ◽  
Low Incidence ◽  
Nasal Pyramid ◽  
Orbital Region

Frontal bone fractures are rare and occur in only 5-12% of maxillofacial traumas and have a relatively low incidence if compared to the remaining types of fracture involving the cranio-maxillofacial region. The fact that the frontal bone is more protected from traumatic events by both the prominence of the nasal pyramid which protects the naso-orbital region and the frontal bone higher resistance to mechanical impacts could attribute to this.

scholarly journals Tratamento cirúrgico de fratura do complexo zigomatico orbital em paciente vítima de acidente desportivo: relato de caso

2020 ◽  
Vol 9 (6) ◽  
pp. 527-530
Author(s):  
José Jhenikártery Maia de Oliveira ◽  
Micaella Fernandes Farias ◽  
Flaviana Laís Pereira dos Santos ◽  
Artemisa Fernanda Moura Ferreira ◽  
Lucas Alexandre de Morais Santos
Keyword(s):  
Bone Fractures ◽  
Maxillofacial Surgery ◽  
Oral And Maxillofacial Surgery ◽  
Facial Fractures ◽  
Porto Alegre ◽  
Maxillofacial Fractures ◽  
Facial Edema ◽  
Nigerian Population ◽  
Non Surgical Treatment

Introdução: Fraturas no complexo zigomático orbital podem resultar em deslocamento ósseo com alteração do volume orbital e distúrbios funcionais. As complicações associadas aos traumas dessa região podem vir a interferir diretamente na qualidade de vida do indivíduo, dessa forma, faz-se necessário a cirurgia de reposicionamento anatômico do osso. Objetivo: Relatar um caso clínico de fratura do complexo zigomático orbital em paciente vítima de acidente desportivo. Relato de caso: Paciente do sexo masculino, leucoderma, vítima de acidente desportivo, compareceu a um serviço de Cirurgia Bucomaxilofacial da cidade de Recife-PE, apresentando alterações anatômicas visíveis na região zigomática do lado esquerdo da face. Ao exame clínico observou-se assimetria facial, edema, equimose periorbital, hemorragia subconjuntival, perda de volume do lado afetado e desconforto relado pelo paciente, sugerindo fratura do complexo zigomático orbital. A Tomografia Computadorizada mostrou perda da projeção anteroposterior do corpo do osso zigomático esquerdo, com fratura no arco zigomático e descontinuidade da sutura esfenozigomática esquerdas. O corte tomográfico coronal evidenciou aprisionamento do conteúdo orbital por fragmentos presentes no assoalho da órbita, e fratura do pilar zigomático-maxilar. Através de acessos cirúrgicos peri-orbitais (superciliar e subtarsal) foi instalada 1 mini-placa com parafusos (1 em cada acesso), nas regiões da sutura fronto-zigomática e da margem infraorbital. Pelo acesso intraoral foi fixada uma placa no pilar zigomático-maxilar. O tratamento cirúrgico buscou acesso ao esqueleto da órbita, redução anatômica e fixação interna estável com mini-placas e parafusos. Considerações finais: Após 10 dias, observou-se o restabelecimento anatômico da projeção anteroposterior do osso zigomático direto, procedendo à melhora estético-funcional. Descritores: Anatomia Regional; Traumatologia; Fraturas Orbitárias. Referências Obimakinde OS, Ogundipe KO, Rabiu TB, Okoje VN. Maxillofacial fractures in a budding teaching hospital: a study of pattern of presentation and care. Pan Afr Med J. 2017;26:218. Ugboko V, Udoye C, Ndukwe K, Amole A, Aregbesola S. Zygomatic complex fractures in a suburban Nigerian population. Dent Traumatol. 2005;21(2):70-5.  Zamboni RA, Wagner JCB, Volkweis MR, Gerhardt EL, Buchmann EM, Bavaresco CS. Epidemiological study of facial fractures at the Oral and Maxillofacial Surgery Service, Santa Casa de Misericordia Hospital Complex, Porto Alegre - RS - Brazil. Rev Col Bras Cir. 2017;44(5):491-97. Ramos JC, Almeida MLD, Alencar YCG, de Sousa Filho LF, Figueiredo CHMC, Almeida MSC. Estudo epidemiológico do trauma bucomaxilofacial em um hospital de referência da Paraíba. Rev Col Bras Cir. 2018;45(6):e1978. Wulkan M, Parreira Junior JG, Botter DA. Epidemiologia do trauma facial. Rev Assoc Med Bras. 2005;51(5):290-95. Knight JS, North JF. The classification of malar fractures: an analysis of displacement as a guide to treatment. Br J Plast Su1961;13:325-39. Mendonça JCG, Crivelli DMB. Tratamento de fratura cominutiva do complexo zigomático orbitário com utilização de fio de aço: relato de caso. Rev Bras Cir Cabeça Pescoço. 2012; 41(2):93-5. Hupp JR, Tucker MR, Ellis E.Cirurgia oral e maxilofacial contemporânea. 6. ed. Rio de Janeiro: Elsevier; 2015. p. 1099-1113. Oliva MA. Acesso subciliar para fraturas do complexozigomático-orbitári. Rev Bras Cir Cabeça Pescoço. 2013;42(2):106-8. Soares LP, Gaião L, Santos MESM, Pozza DH, Oliveira MG. Indicações da Tomografia Computadorizada no Diagnóstico das Fraturas Nasoórbito-etmoidais. Rev de Clin Pesq Odontol. 2004;1(1):29-33. Kurita M, Okazaki M, Ozaki M, Tanaka Y, Tsuji N, Takushima A, et al. Patient satisfaction after open reduction and internal fixation of zygomatic bone fractures. J Craniofac Surg .2010;21(7):45–9. Hammer B. Fraturas orbitárias: Diagnóstico, tratamento cirúrgico, correções secundárias. São Paulo: Santos; 2005. Panarello F, Chaves Júnior AC, Leles JLR, Oliveira MG. Análise dos materiais empregados para a reconstrução das fraturas orbitárias – Revisão de literatura. RBC: Rev Int Cir Traumatol Bucomaxilofacial. 2005;3(9):57-64. Kloss FR, Stigler RG, Brandstätter A, Tuli T, Rasse M, Laimer K, Hächl OL, Gassner R. Complications related to midfacial fractures: operative versus non-surgical treatment. Int J Oral Maxillofac Surg. 2011;40(1):33-7. Liedtke FS, Richinho KP, Pisanelli CH, Araf D. Fraturas do soalho da órbita do tipo ‘’Blow-out”: revisão de literatura. Revicience 2005;5(5):8-11.

scholarly journals Review of Myeloma Therapies and Their Potential for Oral and Maxillofacial Side Effects

Cancers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 4479
Author(s):  
Sophie Beaumont ◽  
Simon Harrison ◽  
Jeremy Er
Keyword(s):  
Quality Of Life ◽  
Side Effects ◽  
Oral Cavity ◽  
Haematological Malignancy ◽  
Bone Fractures ◽  
Osteonecrosis Of The Jaw ◽  
Antiresorptive Therapy ◽  
Maxillofacial Region ◽  
Skeletal Related Events

Myeloma is a common haematological malignancy in which adverse skeletal related events are frequently seen. Over recent years, treatment for myeloma has evolved leading to improved survival. Antiresorptive therapy is an important adjunct therapy to reduce the risk of bone fractures and to improve the quality of life for myeloma patients; however, this has the potential for unwanted side effects in the oral cavity and maxillofacial region. Osteonecrosis of the jaw related to antiresorptive medications and other myeloma therapies is not uncommon. This review serves to highlight the risk of osteonecrosis of the jaw for myeloma patients, with some suggestions for prevention and management.

scholarly journals Secondary Reconstruction of the Zygomaticomaxillary Complex

2020 ◽  
Vol 34 (04) ◽  
pp. 254-259
Author(s):  
Hessah M. Aman ◽  
Abdulrahman Alenezi ◽  
Yadranko Ducic ◽  
Likith V. Reddy
Keyword(s):  
Surgical Planning ◽  
Bone Fractures ◽  
Nasal Bone ◽  
Soft Tissue Augmentation ◽  
Alloplastic Material ◽  
Facial Fractures ◽  
Multiple Points ◽  
Secondary Reconstruction ◽  
Virtual Surgical Planning ◽  
Zygomaticomaxillary Complex

AbstractZygomaticomaxillary (ZMC) fractures are the second most common facial fractures after nasal bone fractures. The zygoma, with its location and multiple points of articulations, lends itself to both facial structure and esthetics. Secondary ZMC deformities are complications of inadequate primary correction, delayed repair, or lack of repair. Secondary revisions of ZMC aim to correct ZMC displacement and projection and to address orbital discrepancies. Extensive correction involving significant orbital and malar defects requires zygomatic repositioning osteotomies and would greatly benefit from the utilization of virtual surgical planning, intraoperative navigation, and imaging. Minor corrections in malar projection can be corrected by onlay grafting and soft tissue augmentation and resuspension. Isolated or minor orbital corrections can be managed by autogenous or alloplastic material to restore lost orbital volume and anatomy.

scholarly journals 1633 Developing Confidence in Dental Core Trainees; A National Review of The Trainee Experience

2021 ◽  
Vol 108 (Supplement_6) ◽  
Author(s):  
R Karia ◽  
S Miskry ◽  
K Fan
Keyword(s):  
Clinical Skills ◽  
Maxillofacial Surgery ◽  
Training Programme ◽  
Oral And Maxillofacial Surgery ◽  
Mandibular Fractures ◽  
Facial Fractures ◽  
National Review ◽  
Induction Process ◽  
Postgraduate Training Programme ◽  
Training Post

Abstract Aim In the U.K, Dental Core Training (DCT) is an elective postgraduate training programme. There are over 700 DCT jobs with the majority in Oral and Maxillofacial Surgery (OMFS). Our focus was to measure the confidence and skills of 103 DCTs, as they mature during a year in OMFS. Method OMFS DCTs answered questionnaires in month 1, 3 and 6 of their training post, regarding confidence and proficiency in assessment of dental infections, facial fractures, swellings, pathology, airway risk, imaging and performing suturing. Results In month 1, 55% of DCTs were ‘somewhat confident’ in performing intra-oral suturing and assessing dento-facial infection out of the skills assessed. Only 22% of DCTs were ‘extremely confident’ in any competencies. Specifically, DCTs felt ‘not at all confident’ with interpretation of scans (78%) and assessment of facial fractures (35%). Between month 1 and month 6 there has been an increase in confidence across all competencies. Notably, a 42% confidence increase in extra-oral suturing and 61% increase in assessing mandibular fractures. Conclusions We demonstrate that an OMFS training year improves confidence in clinical skills and that an adequate time in a post is required to attain that. Our results highlight areas where DCTs lack confidence early in their posts. These could be targeted at dental school, during the hospital induction process or through guided support and training in the initial phase of their jobs. This study adds clarity to both dentists and doctors contemplating a training year in OMFS and gives insight into how to support and train them.

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