scholarly journals Diagnostic Parameters of Six Degrees of Freedom Jaw Movement for the Stomatognathic Function.

1993 ◽  
Vol 37 (4) ◽  
pp. 761-768 ◽  
Author(s):  
Ryutaro Ueda ◽  
Eiichi Bando ◽  
Masanori Nakano ◽  
Atsushi Suzuki ◽  
Tetsuya Fujimura ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Jaw Movement ◽  
Six Degrees Of Freedom ◽  
Diagnostic Parameters

scholarly journals Individual mandibular movement registration and reproduction using an optoeletronic jaw movement analyzer and a dedicated robot: a dental technique

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Massimo Carossa ◽  
Davide Cavagnetto ◽  
Paola Ceruti ◽  
Federico Mussano ◽  
Stefano Carossa
Keyword(s):  
Degrees Of Freedom ◽  
Reference Points ◽  
Production Costs ◽  
Mandibular Movement ◽  
Time Saving ◽  
Additional Advantage ◽  
Jaw Movement ◽  
Six Degrees Of Freedom ◽  
Motion System ◽  
Occlusal Surfaces

Abstract Background Fully adjustable articulators and pantographs record and reproduce individual mandibular movements. Although these instruments are accurate, they are operator-dependant and time-consuming. Pantographic recording is affected by inter and intra operator variability in the individuation of clinical reference points and afterwards in reading pantographic recording themselves. Finally only border movements can be reproduced. Methods Bionic Jaw Motion system is based on two components: a jaw movement analyzer and a robotic device that accurately reproduces recorded movements. The jaw movement analyzer uses an optoelectronic motion system technology made of a high frequency filming camera that acquires 140frames per second and a custom designed software that recognizes and determines the relative distance at each point in time of markers with known geometries connected to each jaw. Circumferential modified retainers connect markers and do not cover any occlusal surfaces neither obstruct occlusion. The recording process takes 5 to 10 s. Mandibular movement performance requires six degrees of freedom of movement, 3 rotations and 3 translations. Other robots are based on the so-called delta mechanics that use several parallel effectors to perform desired movements in order to decompose a complex trajectory into multiple more simple linear movements. However, each parallel effector introduces mechanical inter-component tolerances and mathematical transformations that are required to transform a recorded movement into the combination of movements to be performed by each effector. Bionic Jaw Motion Robot works differently, owing to three motors that perform translational movements and three other motors that perform rotations as a gyroscope. This configuration requires less mechanical components thus reducing mechanical tolerances and production costs. Both the jaw movement analyzer and the robot quantify the movement of the mandible as a rigid body with six degrees of freedom. This represents an additional advantage as no mathematical transformation is needed for the robot to reproduce recorded movements. Results Based on the described procedure, Bionic Jaw Motion provide accurate recording and reproduction of maxillomandibular relation in static and dynamic conditions. Conclusion This robotic system represents an important advancement compared to available analogical and digital alternatives both in clinical and research contexts for cost reduction, precision and time saving opportunities.

scholarly journals Dynamics of the Human Masticatory System

2002 ◽  
Vol 13 (4) ◽  
pp. 366-376 ◽  
Author(s):  
J.H. Koolstra
Keyword(s):  
Degrees Of Freedom ◽  
Center Of Gravity ◽  
Anatomical Structures ◽  
Jaw Movement ◽  
Six Degrees Of Freedom ◽  
Lower Jaw ◽  
Movement Characteristics ◽  
Hinge Axis ◽  
Masticatory System ◽  
The Individual

In this review, the movement characteristics of the human masticatory system are discussed from a biomechanical perspective. The discussion is based upon the three fundamental laws of mechanics applied to the various anatomical structures that are part of the masticatory system. An analysis of the forces and torques applied to the mandible by muscles, joints, articular capsules, and teeth is used to assess the determinants of jaw movement. The principle of relating the interplay of forces to the center of gravity of the lower jaw, in contrast to a hinge axis near its joints, is introduced. It is evident that the muscles are the dominant determinants of jaw movement. The contributions of the individual muscles to jaw movements can be derived from the orientation of their lines of action with respect to the center of gravity of the lower jaw. They cause the jaw to accelerate with six degrees of freedom. The ratio between linear and angular accelerations is subtly dependent on the mass and moments of inertia of the jaw, and the structures that are more or less rigidly attached to it. The effects of articular forces must be taken into account, especially if the joints are loaded asymmetrically. The muscles not only move the jaw but also maintain articular stability during midline movements. Passive structures, such as the ligaments, become dominant only when the jaw reaches its movement boundaries. These ligaments are assumed to prevent joint dislocation during non-midline movements.

OKAS-3D: optoelectronic jaw movement recording system with six degrees of freedom

1995 ◽  
Vol 33 (5) ◽  
pp. 683-688 ◽  
Author(s):  
M. Naeije ◽  
J. J. Van der Weijden ◽  
C. C. E. J. Megens
Keyword(s):  
Degrees Of Freedom ◽  
Recording System ◽  
Jaw Movement ◽  
Six Degrees Of Freedom

scholarly journals Development of measuring system for jaw movement with six degrees of freedom motion in rodents

2016 ◽  
Vol 23 (1) ◽  
pp. 32-33
Author(s):  
Emi Moriuchi ◽  
Tomoko Yoshimi ◽  
Ayumi Fujishita ◽  
Aya Nakamura ◽  
Ryo Hamanaka ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Measuring System ◽  
Jaw Movement ◽  
Six Degrees Of Freedom

Control of processing at multi-tool two-support setup

2020 ◽  
pp. 67-73
Author(s):  
N.D. YUsubov ◽  
G.M. Abbasova
Keyword(s):  
Degrees Of Freedom ◽  
Factor Model ◽  
Angular Displacement ◽  
Factor Models ◽  
Technological System ◽  
Displacement Control ◽  
Model Accuracy ◽  
Six Degrees Of Freedom ◽  
Angular Displacements ◽  
And Control

The accuracy of two-tool machining on automatic lathes is analyzed. Full-factor models of distortions and scattering fields of the performed dimensions, taking into account the flexibility of the technological system on six degrees of freedom, i. e. angular displacements in the technological system, were used in the research. Possibilities of design and control of two-tool adjustment are considered. Keywords turning processing, cutting mode, two-tool setup, full-factor model, accuracy, angular displacement, control, calculation [email protected]

scholarly journals Design and Calibration of a Hall Effect System for Measurement of Six-Degree-of-Freedom Motion within a Stacked Column

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3740
Author(s):  
Olafur Oddbjornsson ◽  
Panos Kloukinas ◽  
Tansu Gokce ◽  
Kate Bourne ◽  
Tony Horseman ◽  
...  
Keyword(s):  
Hall Effect ◽  
Degrees Of Freedom ◽  
Reactor Core ◽  
Degree Of Freedom ◽  
Life Extension ◽  
Scale Model ◽  
Design Development ◽  
Seismic Safety ◽  
Six Degrees Of Freedom ◽  
Six Degree Of Freedom

This paper presents the design, development and evaluation of a unique non-contact instrumentation system that can accurately measure the interface displacement between two rigid components in six degrees of freedom. The system was developed to allow measurement of the relative displacements between interfaces within a stacked column of brick-like components, with an accuracy of 0.05 mm and 0.1 degrees. The columns comprised up to 14 components, with each component being a scale model of a graphite brick within an Advanced Gas-cooled Reactor core. A set of 585 of these columns makes up the Multi Layer Array, which was designed to investigate the response of the reactor core to seismic inputs, with excitation levels up to 1 g from 0 to 100 Hz. The nature of the application required a compact and robust design capable of accurately recording fully coupled motion in all six degrees of freedom during dynamic testing. The novel design implemented 12 Hall effect sensors with a calibration procedure based on system identification techniques. The measurement uncertainty was ±0.050 mm for displacement and ±0.052 degrees for rotation, and the system can tolerate loss of data from two sensors with the uncertainly increasing to only 0.061 mm in translation and 0.088 degrees in rotation. The system has been deployed in a research programme that has enabled EDF to present seismic safety cases to the Office for Nuclear Regulation, resulting in life extension approvals for several reactors. The measurement system developed could be readily applied to other situations where the imposed level of stress at the interface causes negligible material strain, and accurate non-contact six-degree-of-freedom interface measurement is required.

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