Capturing motions and forces of the human masticatory system to replicate chewing and to perform dental wear experiments

Raabe, Dierk; Harrison, Alan; Alemzadeh, Kazem; Ireland, AJ; Sandy, Jonathan R

doi:10.1109/cbms.2011.5999149

Cited by 10 publications

(7 citation statements)

References 19 publications

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“…An increase in load does not cause a change in the stress distribution, only an increase in values. A loading that a structure is subjected can cause micro-cracks in certain parts of the structure, but not an immediate rupture [36].…”

Section: Discussionmentioning

confidence: 99%

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Finite Elements Method in Implant Prosthetics

Roateşi¹

2016

Perusal of the Finite Element Method

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This chapter is devoted to the study of behavior of functional loadings for implant prosthetics rehabilitation by finite elements method (FEM). It presents a numerical calculation of stress, displacement, and strain in implant and surrounding bone, which is used to assess risk factors from a biomechanical point. The masticatory forces are simulated by axial and/or non-axial loads, and they are responsible for the biomechanical response of the bone-tissue-implant-crown system. This chapter represents an analysis of this response in view of highlighting the factors involved in implant stability and success. The safety factor for different loading cases is calculated as well. A good agreement with other study results and clinical studies is obtained.

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Section: Discussionmentioning

confidence: 99%

“…Masticatory force size can be variable depending on age, sex, and para-functional habits, and can vary from anterior to posterior [36]. Loadings simulating mastication forces generate stress concentrations that must be evaluated.…”

Section: Load Applicationmentioning

confidence: 99%

Finite Elements Method in Implant Prosthetics

Roateşi¹

2016

Perusal of the Finite Element Method

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“…While effectively mitigating the effects of the robot's magnetic field, such a tool certainly increased the positioning uncertainty by slightly bending and vibrating while in motion. For the laboratory experiments, the trajectory representing natural masticatory motion was sampled from [21]. This particular trajectory was chosen for consistency, with the purpose of comparing the results with our previous work, where it was already used.…”

Section: -Dof Methods Experimentsmentioning

confidence: 99%

Permanent Magnet Tracking Method Resistant to Background Magnetic Field for Assessing Jaw Movement in Wearable Devices

Jucevičius

Ožiūnas²,

Narvydas

et al. 2022

Sensors

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There is a large gap between primitive bruxism detectors and sophisticated clinical machines for jaw kinematics evaluation. Large, expensive clinical appliances can precisely record jaw motion, but completely restrain the patient for the duration of the test. Wearable bruxism detectors allow continuously counting and recording bites, but provide no information about jaw movement trajectories. Previously, we developed a permanent magnet and three-axis magnetometer-based method for wearable, intra-oral continuous jaw position registration. In this work, we present an effective solution of the two main drawbacks of the method. Firstly, a two-adjacent-magnetometer approach is able to compensate for background magnetic fields with no reference sensor outside of the system’s magnetic field. Secondly, jaw rotational angles were included in the position calculations, by applying trigonometric equations that link the translation of the jaw to its rotation. This way, we were able to use a three-degree-of-freedom (3-DOF) magnetic position determination method to track the positions of the 5-DOF human masticatory system. To validate the method, finite element modeling and a 6-DOF robotic arm (0.01 mm, 0.01°) were used, which showed a 37% decrease in error in the average RMSE = 0.17 mm. The method’s potentially can be utilized in small-scale, low-power, wearable intra-oral devices for continuous jaw motion recording.

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“…To assess position tracking error, two test trajectories were used: an easily accessible cubic trajectory with 10 mm border and a real human jaw masticatory cycle trajectory (10 × 7 × 5 mm), sampled from the data presented in [ 12 ]. While measuring at each point, every magnetic field value was averaged from 10 consecutive measurements, with the positioning system on hold.…”

Section: Methodsmentioning

confidence: 99%

Accelerometry-Enhanced Magnetic Sensor for Intra-Oral Continuous Jaw Motion Tracking

Jucevičius

Ožiūnas²,

Mažeika

et al. 2021

Sensors

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Currently available jaw motion tracking methods require large accessories mounted on a patient and are utilized in controlled environments, for short-time examinations only. In some cases, especially in the evaluation of bruxism, a non-restrictive, 24-h jaw tracking method is needed. Bruxism oriented, electromyography (EMG)-based devices and sensor-enhanced occlusal splints are able to continuously detect masticatory activity but are uninformative in regards to movement trajectories and kinematics. This study explores a possibility to use a permanent magnet and a 3-axial magnetometer to track the mandible’s spatial position in relation to the maxilla. An algorithm for determining the sensor’s coordinates from magnetic field values was developed, and it was verified via analytical and finite element modeling and by using a 3D positioning system. Coordinates of the cubic test trajectory (a = 10 mm) were determined with root-mean-square error (RMSE) of 0.328±0.005 mm. Possibility for teeth impact detection by accelerometry was verified. Test on a 6 degrees-of-freedom (DOF), hexapod-based jaw motion simulator moving at natural speed confirmed the system’s ability to simultaneously detect jaw position and the impacts of teeth. Small size of MEMS sensors is suitable for a wearable intra-oral system that could allow visualization of continuous jaw movement in 3D models and could enable new research on parafunctional jaw activities.

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Capturing motions and forces of the human masticatory system to replicate chewing and to perform dental wear experiments

Cited by 10 publications

References 19 publications

Finite Elements Method in Implant Prosthetics

Finite Elements Method in Implant Prosthetics

Permanent Magnet Tracking Method Resistant to Background Magnetic Field for Assessing Jaw Movement in Wearable Devices

Accelerometry-Enhanced Magnetic Sensor for Intra-Oral Continuous Jaw Motion Tracking

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