scholarly journals 3D Printed Anatomy-Specific Fixture for Consistent Glenoid Cavity Position in Shoulder Simulator

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Gabriel Venne ◽  
Greg Esau ◽  
Ryan T. Bicknell ◽  
J. Tim Bryant
Keyword(s):  
Biomechanical Testing ◽  
Anatomical Structure ◽  
Testing System ◽  
Anatomical Structures ◽  
Anatomical Features ◽  
Design Guide ◽  
Loading System ◽  
Bony Anatomy ◽  
3D Printed

Purpose. Fixation methods for consistent anatomical structure positioning in biomechanical testing can be challenging. Image-based 3D printing is an attractive method for fabrication of biomechanical supports of anatomical structure due to its ability to precisely locate anatomical features with respect to the loading system. Method. A case study is presented to provide a design guide for fixation block fabrication. The anatomy of interest was CT scanned and reconstructed in 3D. The model was imported into commercially available CAD software and modified into a solid object and to create the fixture block. The CAD fixture block is standardized such that anatomical features are always in the same position for the testing system by subtracting the anatomy from a base fixture block. Results. This method allowed a strong immobilization of anatomical specimens and a controlled and consistent positioning feature with respect to the testing system. Furthermore, the fixture block can be easily modified and adapted to anatomical structures of interest using CAD software. Conclusion. This approach allows preservation of the bony anatomy integrity and provides a repeatable and consistent anatomical positioning with respect to the testing system. It can be adapted for other anatomical structures in various other biomechanical settings.

scholarly journals Estudo comparativo entre duas técnicas radiográficas transcranianas para estudo da ATM

2012 ◽  
Vol 11 (2) ◽  
pp. 189
Author(s):  
Marcus Vinicius Linhares de Oliveira ◽  
Paulo Sergio Flores Campos
Keyword(s):  
Image Quality ◽  
Anatomical Structure ◽  
Glenoid Fossa ◽  
Font Size ◽  
Anatomical Structures ◽  
Mandibular Joint ◽  
Radiographic Interpretation ◽  
Exposure Methods ◽  
Pathological Assessment

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De modo a oferecer mais informações possíveis, visualização mais clara, redução das dificuldades de interpretação radiográfica, é imperativa a boa execução das técnicas radiográficas e o desenvolvimento de novos métodos de exposição. <strong>Objetivo</strong>: Avaliar duas incidências radiográficas convencionais que possibilitam o estudo da ATM e relacioná-las com a qualidade da imagem, de acordo com a visualização das estruturas anatômicas. <strong>Materiais e métodos</strong> : O estudo foi realizado através da execução de duas técnicas radiográficas (SCHULLER e LAW modificado), utilizadas para estudo da ATM em um simulador com ossos do crânio e mandíbula humana recoberta com resina. A qualidade da imagem foi <span style="color: black;">avaliada por três radiologistas com experiência, que atribuíram escores (01 –<span>  </span>inadequado; 02 – aceitável com restrições; 03 – aceitável sem restrições) relacionados à sobreposição das estruturas, à visualização da fossa mandibular e à definição do côndilo. <strong>Resultados</strong>: Para os três avaliadores, a técnica B apresentou a concordância em 75% dos pontos analisados, observou-se que para a técnica A os avaliadores 1 e 3 concordaram em 75%, enquanto que os indicies kappa foram considerados moderados para a técnica B . </span><strong>Conclusão</strong>: As técnicas transcranianas permitem a avaliação anatômica e patológica da ATM como forma simples e mais acessível ao paciente sendo a técnica de Law modificado a que apresenta maior concordância entre os avaliadores. </span></p> <p class="MsoNormal" style="margin: 0cm 22.7pt 0.0001pt; text-align: justify;"><strong><span style="font-size: 8pt; color: black;" lang="EN-US"> </span></strong></p> <p class="MsoNormal" style="margin: 0cm 22.7pt 0.0001pt; text-align: justify;"><strong><span style="font-size: 8pt; color: black;" lang="EN-US">Abstract</span></strong></p> <p class="MsoNormal" style="margin: 0cm 22.7pt 0.0001pt; text-align: justify;"><strong><span style="font-size: 8pt; color: black;" lang="EN-US">Introduction</span></strong><span style="font-size: 8pt;" lang="EN-US">: Image studies of the temporal mandibular joint (TMJ) are presented as an assistance to the diagnosis of certain specific pathologies related to this anatomical structure. In order to provide as much information as possible, a clearer view and a reduction in the difficulty of the radiographic interpretation it is imperative a good performance of the radiographic techniques and the development of new exposure methods. <strong>Objective</strong>: Evaluate two conventional radiographic views that allow the study of TMJ and relate them with the image quality according to the visualization of anatomical structures <strong>Materials and Methods</strong>: The study was conducted by running two radiographic techniques (SCHULLER and modified LAW) used to the TMJ study in a phantom containing cranial bones and a human mandibular covered with resin. The image quality was evaluated by three experienced radiologists assigning scores (01 - inappropriate, 02 - acceptable with restrictions, 03-acceptable without restrictions) related to overlapping structures, visualization of the glenoid fossa and condyle definition. <strong>Results:</strong> For three evaluators, B technique presented an agreement on 75% of the points analyzed. It was observed that for technique A, evaluators 1 and 3 evaluators agreed on 75% while the kappa indexwere considered moderated for B technique. <strong>Conclusion</strong>: Transcranial techniques allow anatomical and pathological assessment of the TMJ in a simple and more accessible way to the patient and the technique of modified Law presents the best agreement between raters.</span></p>

scholarly journals Biomaterials – Novel Advances in Nasal Medical Implants, 3D Printing Applications

2021 ◽  
pp. 52-64
Author(s):  
T. M. Amulya ◽  
K. G. Siree ◽  
T. M. Pramod Kumar ◽  
M. B. Bharathi ◽  
K. Divith ◽  
...  
Keyword(s):  
3D Printing ◽  
Tissue Loss ◽  
Medical Implants ◽  
Anatomical Structures ◽  
Regulatory Aspects ◽  
3D Printed ◽  
Targeting Ability ◽  
Soft Tissue Loss ◽  
Biodegradable Biomaterials ◽  
High Degree

The scope and applications of biomaterials have spread out throughout a broad spectrum. Particularly in pharmacy, biomaterials are an attractive choice because they can be modified to decrease toxicity, increase the targeting ability among many other aspects of drug delivery. Extensive studies have led to the development of many metal-based, ceramic, biocompatible and biodegradable biomaterials for medical purposes among many others. The utilization of 3D printing in this discipline is a very novel research subject with infinite potential. Personalized and customized nasal implants are a great option to increase patient compliance and 3D printed accurate anatomical structures are rendered to be effective tools of learning. One of the disadvantages of biomaterial-based implants is the formation of a thick fibrous capsule formation around the implant, others being breakage, soft tissue loss and so on. Regulatory aspects are less explored for nasal implants. 3D printing is a unique technique that allows for a high degree of customisation in pharmacy, dentistry and in designing of medical devices. Current research in 3D printing indicates towards reproducing an organ in the form of a chip; paving the way for more studies and opportunities to perfecting the existing technique.

scholarly journals The leaf anatomical features of some Rosa species in relation to their drought resistance

2016 ◽  
Vol 71 (1) ◽  
pp. 16-19 ◽  
Author(s):  
N. Nuzhyna ◽  
O. Tkachuk
Keyword(s):  
Drought Tolerance ◽  
Drought Resistance ◽  
Leaf Anatomy ◽  
Anatomical Structure ◽  
Anatomical Features ◽  
Rosa Species

The leaf anatomy of species of the genus Rosa: R. donetzica, R. kokanica, R. roxburhii, R. rugosa, R. spinosissima was studied. It was found that the plants R. donetzica and R. kokanica have very low drought tolerance by the anatomical structure. The plants of species R. rugosin and R. spinosissima have most xeromorphy features.

scholarly journals Preliminary Qualitative Evaluation of the Anatomical Structures for Vocalization in the Chicken (Gallus gallus domestica)

2021 ◽  
Vol 3 (1) ◽  
pp. 13-18
Author(s):  
J. C. Shawulu
Keyword(s):  
Abrupt Change ◽  
Qualitative Evaluation ◽  
Gallus Gallus ◽  
Anatomical Structure ◽  
Domestic Chicken ◽  
Local Market ◽  
Anatomical Structures ◽  
Red Jungle Fowl ◽  
Males And Females

The anatomical structure of phonation in the domestic chicken Gallus gallus (red jungle fowl, forma domestica) of both sexes was studied to determine sex variations in structures. Ten (10) birds, involving 5 males and 5 females were obtained from a local market for student demonstrations and used for this study. Tracheal rings were observed to be made of circular cartilages numbering thirty and above with the distal most (1/5) tracheal rings narrowed, calcified and fused as the tympanum making part of the Syrinx. The rings become calcified and somewhat collapsed through the bronchial bifurcations. When squeezed, the trachea collapsed completely between fingers but could at releasing the fingers be raised up due to elastic components separating the rings from one another. Other structures involved in vocalization includes straps of muscles. Male structures involved in respiration and vocalization were well formed compared to those of the female. Both tracheobronchialis lateralis and ventralis muscles were thicker than those of the female. Male tracheobronchialis ventralis and dorsalis muscles were well formed and spindle shaped. However, the female tracheobronchialis muscles were seen to be wider compared to the male. The vocal organs (voice box) were seen to be arbitrarily triangular in structure at the bifurcation of the trachea in both sexes. The male Syringeal walls were thinner and were seen to have marked inter Pessula space. The Pessulus mark an abrupt change from the circular trachea to strongly elliptical entrances to the bronchi. It was concluded that the differences in the thinness of syringeal walls coupled with differences between the males and females in other tracheal muscles might be responsible for the stronger vocalization in the male.

scholarly journals A SINGLE CASE STUDY ON THE EFFECT OF AYURVEDIC MANAGEMENT IN TIMIRA W.S.R. TO MYOPIA – A CASE STUDY

2021 ◽  
Vol 9 (7) ◽  
pp. 1549-1554
Author(s):  
Kavita Rathore ◽  
Shamsa Fiaz
Keyword(s):  
Visual Acuity ◽  
Young Adults ◽  
Single Case ◽  
Single Case Study ◽  
Anatomical Structures ◽  
The World ◽  
Chief Complaints ◽  
Children And Young Adults ◽  
Defective Vision

Introduction - Myopia is the most common Refractive error of the eye seen in children and young adults and it has become more prevalent in recent years and is a cause of concern the world over. Myopia commonly referred to as near or shortsightedness. Some of the clinical features of Vataja Timira can be correlated with Myopia. Timira is counted under the Drishtigata Rogas [1] described by Sushruta. Timira involving first and second patala in terms of symptoms, anatomical structures involved and the pathogenesis of the disease. Timira begins with the blurring of vision gradually leading to the deterioration of eyesight. Shastrokta lakshanas of Vatika Timira such as bhramantiva sa pashyati, aavil darshan, vyaavidha darshan, aruna darshan [2]. Materials and Methods - A 20-year-old male, came to Shalakya Tantra OPD in National Institute of Ayurveda, deemed to be University Jaipur (R.J.), with chief complaints of defective vision for distance in both eyes, pain in both eyes and watering from both eyes since 4 months. He was treated with Nasya, Netra Pariseka, one sitting of Tarpana, Triphala guggulu, Patoladi eyedrops and Netramritam eyedrops. Result - At the end of the study, improvement in the visual acuity in both eyes, improvement in pain in both eyes and watering from both eyes have reduced. Conclusion -Thus, it can be concluded that Ayurvedic treatments are helpful to control Myopia. Keywords: Myopia, Nasya, Tarpana, Netra pariseka, Timira, Triphala Guggulu.

3D Printing of Medical Models: A Literature Review

2017 ◽  
Author(s):  
Xingjian Wei ◽  
Li Zeng ◽  
Zhijian Pei
Keyword(s):  
3D Printing ◽  
Literature Review ◽  
Medical Curriculum ◽  
Industrial Applications ◽  
Physical Models ◽  
Research Directions ◽  
Anatomical Structures ◽  
Medical Models ◽  
3D Printed ◽  
Anatomy Teaching

Medical models are physical models of human or animal anatomical structures such as skull and heart. Such models are used in simulation and planning of complex surgeries. They can also be utilized for anatomy teaching in medical curriculum. Traditionally, medical models are fabricated by paraffin wax or silicone casting. However, this method is time-consuming, of low quality, and not suitable for personalization. Recently, 3D printing technologies are used to fabricate medical models. Various applications of 3D printed medical models in surgeries and anatomy teaching have been reported, and their advantages over traditional medical models have been well-documented. However, 3D printing of medical models bears some special challenges compared to industrial applications of 3D printing. This paper reviews more than 50 publications on 3D printing of medical models between 2006 and 2016, and discusses knowledge gaps and potential research directions in this field.

An Adaptable Ct-Derived 3D-Printed Alignment Fixture Minimizes Errors in Whole-Bone Biomechanical Testing

2021 ◽  
Author(s):  
Jordan V. Inacio ◽  
DanielleM Cristino ◽  
Michael W. Hast ◽  
Hannah Dailey
Keyword(s):  
Computational Models ◽  
Biomechanical Testing ◽  
Ct Scanning ◽  
Industrial Applications ◽  
Long Bone ◽  
Implant Design ◽  
Orthopaedic Implant ◽  
Test Frame ◽  
3D Printed ◽  
The Impact

Abstract Biomechanical testing of long bones can be subject to undesirable errors and uncertainty due to malalignment of specimens with respect to the mechanical axis of the test frame. To solve this problem, we designed a novel, customizable alignment and potting fixture for long bone testing. The fixture consisted of 3D-printed components modeled from specimen-specific CT scans to achieve a predetermined specimen alignment. We demonstrated the functionality of this fixture by comparing benchtop torsional test results to specimen-matched finite element models and found a strong and statistically significant correlation (R2 = 0.9536, p &lt; 0.001). Additional computational models estimated the impact of malalignment on mechanical behavior in both torsion and axial compression. Results confirmed that torsion testing is relatively robust to alignment artifacts, with absolute percent errors less than 8% in all malalignment scenarios. In contrast, axial testing was highly sensitive to setup errors, experiencing absolute percent errors up to 40% with off-center malalignment and up to 130% with angular malalignment. This suggests that whenever appropriate, torsion tests should be used preferentially as a summary mechanical measure. When more challenging modes of loading are required, pre-test clinical-resolution CT scanning can be effectively used to create potting fixtures that allow for precise pre-planned specimen alignment. This may be particularly important for more sensitive biomechanical tests (e.g. axial compressive tests) that may be needed for industrial applications, such as orthopaedic implant design.

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