Clinical Methodology Quantifying the Emergence Profile Contour For Immediate Provisionalization: A Proposed Mathematical Model

2020 ◽  
Author(s):  
Edgard El Chaar ◽  
Cecilia White ◽  
Toni Salama ◽  
Andrew Andrawis ◽  
Ye Shi
Keyword(s):  
Mathematical Model ◽  
Geometric Model ◽  
3 Dimensional ◽  
Ideal Position ◽  
Linear Distance ◽  
Emergence Curve ◽  
Immediate Implant ◽  
Contour Design ◽  
Clinical Methodology ◽  
The Ideal

Identifying the ideal position of the final restoration prior to implant surgery is essential for optimal aesthetics. Study of the emergence contour design of implant restorations has been limited. The aim of this report is to compile the factors which affect the final esthetic outcome and integrate those factors into an easy-to-use model. This geometric model includes a linear distance created by the placement of an implant platform in relation to the free gingival margin, and a circle representing the emergence profile to create an Emergence Curve. If this model is evaluated and available, a practitioner can make appropriate decisions based on 3-dimensional immediate implant concepts

The Adjustment of the Rotational Alignment of the Distal End of the Extramedullary Guide to the Anteroposterior Axis of the Proximal Tibia in Total Knee Arthroplasty

2021 ◽  
Author(s):  
Hideki Mizu-uchi ◽  
Hidehiko Kido ◽  
Tomonao Chikama ◽  
Kenta Kamo ◽  
Satoshi Kido ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Navigation System ◽  
Proximal Tibia ◽  
Rotational Alignment ◽  
Coronal Alignment ◽  
Ideal Position ◽  
Total Knee ◽  
Alignment Guide ◽  
The Ideal

AbstractThe optimal placement within 3 degrees in coronal alignment was reportedly achieved in only 60 to 80% of patients when using an extramedullary alignment guide for the tibial side in total knee arthroplasty (TKA). This probably occurs because the extramedullary alignment guide is easily affected by the position of the ankle joint which is difficult to define by tibial torsion. Rotational direction of distal end of the extramedullary guide should be aligned to the anteroposterior (AP) axis of the proximal tibia to acquire optimal coronal alignment in the computer simulation studies; however, its efficacy has not been proven in a clinical setting. The distal end of the guide can be overly displaced from the ideal position when using a conventional guide system despite the alignment of the AP axis to the proximal tibia. This study investigated the effect of displacement of the distal end of extramedullary guide relative to the tibial coronal alignment while adjusting the rotational alignment of the distal end to the AP axis of the proximal tibia in TKA. A total of 50 TKAs performed in 50 varus osteoarthritic knees using an image-free navigation system were included in this study. The rotational alignment of the proximal side of the guide was adjusted to the AP axis of the proximal tibia. The position of the distal end of the guide was aligned to the center of the ankle joint as viewed from the proximal AP axis (ideal position) and as determined by the navigation system. The tibial intraoperative coronal alignments were recorded as the distal end was moved from the ideal position at 3-mm intervals. The intraoperative alignments were 0.5, 0.9, and 1.4 degrees in valgus alignment with 3-, 6-, and 9-mm medial displacements, respectively. The intraoperative alignments were 0.7, 1.2, and 1.7 degrees in varus alignment with 3-, 6-, and 9-mm lateral displacements, respectively. In conclusion, the acceptable tibial coronal alignment (within 2 degrees from the optimal alignment) can be achieved, although some displacement of the distal end from the ideal position can occur after the rotational alignment of the distal end of the guide is adjusted to the AP axis of the proximal tibia.

Design of Measurement System of the Center of Gravity

2013 ◽  
Vol 706-708 ◽  
pp. 733-736
Author(s):  
Fang Li
Keyword(s):  
Measurement System ◽  
Center Of Gravity ◽  
Actual Position ◽  
Ideal Position ◽  
The Future ◽  
The Difference ◽  
New System ◽  
The Ideal

It is very difficult to confirm the position of the center of gravity irregular object.This paper introduces a new system,which can be used in measuring and adjusting of the center of gravity.The irregular object was put on the support parts,then the center of gravity was given.When the actual position was compared with the ideal position,the difference was given. Until actual position and ideal position were coincided,the machining was continuing. Matlab was programmed in this measure system. It will be applied widely in the future.

The Astronaut’s Flight Virtual Simulation Outboard of International Space Station

2011 ◽  
Vol 58-60 ◽  
pp. 938-942
Author(s):  
Hong Wei Gao ◽  
Dong Li ◽  
Jin Guo Liu
Keyword(s):  
International Space Station ◽  
Model Transformation ◽  
Geometric Model ◽  
Space Station ◽  
Morphological Characteristics ◽  
Virtual Simulation ◽  
Visual Simulation ◽  
International Space ◽  
3 Dimensional ◽  
View Transformation

This paper studied at the problem of visual simulation of astronaut fling outside in the cabin. Firstly, according to morphological characteristics of the human’s body, we used SolidWorks to construct the simplified geometric model of astronaut. Then we made the model of astronaut carried out the 3-dimensional real-time flight animation based on OpenGL by view transformation and model transformation in VC++ environment.

The crystal structure of kalsilite, KAlSiO4

1965 ◽  
Vol 35 (272) ◽  
pp. 588-595 ◽  
Author(s):  
A. J. Perrotta ◽  
J. V. Smith
Keyword(s):  
Crystal Structure ◽  
Oxygen Atom ◽  
Crystal Structures ◽  
Bond Angle ◽  
Three Dimensional ◽  
Full Matrix ◽  
Ideal Position ◽  
Wide Range ◽  
The Ideal

SummaryA full-matrix, three-dimensional refinement of kalsilite, KAlSi04 (hexagonal, a 5·16, c 8.69 Å, P6a), shows that the silicon and aluminium atoms are ordered. The respective tetrahedral distances of 1·61 and 1·74 Å agree with values of 1·61 and 1·75 Å taken to be typical of framework structures. As in nepheline, an oxygen atom is statistically distributed over three sites displaced 0·25 Å from the ideal position on a triad axis. This decreases the bond angle from 180° to 163° in conformity with observations on some other crystal structures. The potassiumoxygen distances of 2·77, 2·93, and 2·99 Å are consistent with the wide range normally found for this weakly bonded atom.

scholarly journals Finite Element Modeling of Multiscale Diffusion in Intercalated Nanocomposites

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Antonio Greco ◽  
Alfonso Maffezzoli
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Random Distribution ◽  
Geometric Model ◽  
Fe Analysis ◽  
Morphological Features ◽  
Diffusion Behavior ◽  
Simulation Results ◽  
Diffusion Simulation

This work is aimed to study the diffusion in 3D nanocomposites obtained with stacks of lamellar nanofillers characterized by the presence of permeable galleries, by finite element (FE) analysis. To this purpose, a geometric model, based on a random distribution of noninterpenetrating stacks, with each one being made of regularly spaced lamellae, was developed. The developed model is able to account for diffusion between stacks (interstack diffusion) as well as diffusion inside stacks (intrastack diffusion). Simulation results showed that intrastack diffusion, related to flow inside galleries, can be quite relevant, particularly at high values of gallery thickness. Comparison of the simulation results with literature models shows that when intrastack diffusion is not taken into account, the diffusion behavior in intercalated nanocomposites is not well predicted. Therefore, intrastack permeability of nanofillers such as organic modified clays cannot be neglected. Such intrastack diffusivity is shown to depend on the morphological features of the nanofiller requiring the development of a proper mathematical model.

Endotracheal and Enteric Tubes

Chest Imaging ◽  
2019 ◽  
pp. 35-39
Author(s):  
Tyler H. Ternes
Keyword(s):  
Mechanical Ventilation ◽  
Gas Exchange ◽  
Endotracheal Tube ◽  
Medical Devices ◽  
Esophageal Intubation ◽  
Ideal Position ◽  
Tracheostomy Tubes ◽  
Tube Malposition ◽  
The Ideal

The Endotracheal and Enteric Tubes chapter addresses these frequently used medical devices. An endotracheal tube (ETT) is a catheter placed into the airway for mechanical ventilation. It serves to protect the airway and provide adequate gas exchange. The ideal position of the endotracheal tube tip is approximately 5 cm above the carina. Complications of ETT placement include inadequate ventilation if placed too high or too low, esophageal intubation and tracheal injury. Tracheostomy tubes are used in patients who require long-term intubation. Enteric tubes are thin flexible hollow catheters that course into the stomach and beyond. They may be placed via nasal (nasogastic) or oral (orogastric) approach. When used for suctioning, the ideal position of the tube tip is within the stomach. When used for administration of drugs or nutrition, the tube tip is ideally advanced beyond the pylorus. Enteric tube malposition may be due to coiling within the esophagus or inadvertent malposition within the airway. Malpositioning could result in aspiration, lung injury, and pneumothorax.

scholarly journals Die rol van die gemeenskapsverpleegkundige in geestesgesondheid

Curationis ◽  
1981 ◽  
Vol 4 (3) ◽  
Author(s):  
Louise Olivier
Keyword(s):  
Mental Health ◽  
Mental Illness ◽  
School Children ◽  
Community Nurse ◽  
Ideal Position ◽  
The Individual ◽  
The Ideal ◽  
Promote Mental Health

Mental health is an umbrella-like concept encompassing the psychological, emotional and social equilibrium of an individual. Today we are confronted with an ever increasing incidence of mental illness. The individual is unable to adapt and his reactions are unacceptable, inappropriate and inadequate. The community nurse plays a very important role in the prevention of mental illness and the promotion of mental health. The community nurse comes into contact with many people in the community such as the infants, school children, mothers as well as the aged. She is in the position to identify the earliest signs of mental illness and she is also in the ideal position to promote mental health. She plays a role at the primary, secondary and tertiary levels of prevention and must therefore be adequately trained and prepared for this very important function.

Simulation Analysis of Engine-Oil inside the Clearance between Crankshaft Journal and Bearing Shells in the Ideal Stable Conditions

2014 ◽  
Vol 635-637 ◽  
pp. 532-536
Author(s):  
Pei Shu ◽  
Hong Xin Zhang ◽  
Ru Qin Xiao ◽  
Jin Zhu Shi
Keyword(s):  
Simulation Analysis ◽  
Geometric Model ◽  
Engine Oil ◽  
Flow State ◽  
Engine Operation ◽  
Stable Conditions ◽  
Crankshaft Journal ◽  
Oil Flow ◽  
3D Geometric Model ◽  
The Ideal

For the bush-burning problem in the course of the engine operation. Taking a certain kind of engine as reference, build a 3D geometric model of the engine-oil flow field in the ideal stable conditions with GAMBIT and conduct a simulation of it with FLUENT. It reveals that we can have an intuitive understanding of the flow state and pressure distribution of the engine-oil inside the clearance between the crankshaft main journal and crankshaft bearing as well as the rod journal and rod bearing which provides basis for a further refining of bearing lubrication system, improving the lubrication method and enhancing the efficiency of the lubrication.

The ideal pseudo-rigid continuum

2006 ◽  
Vol 462 (2074) ◽  
pp. 3185-3195 ◽  
Author(s):  
James Casey
Keyword(s):  
Mathematical Model ◽  
Mathematical Models ◽  
Royal Society ◽  
Recent Article ◽  
Finite Size ◽  
Rigid Bodies ◽  
Global Constraint ◽  
Restricted Class ◽  
The Ideal

In the literature on pseudo-rigid bodies and their applications, it is generally assumed that these bodies can undergo only a restricted class of motions, without questioning how this restriction is to be strictly enforced. In 2004, I proposed in these Proceedings that such a restriction may be regarded as a ‘global constraint’ on a deformable continuum, and influenced by ideas of Antman & Marlow from the early 1990s, I assumed that the constraint is enforced by a field of reactive stresses, and I constructed a mathematical model that idealizes pseudo-rigid bodies as globally constrained continua of finite size. In a recent article in Proceedings of the Royal Society A , the validity of this model was challenged. Essentially, the controversy revolves around the issue of working definitions versus idealized mathematical models of pseudo-rigid bodies.

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