Development of Mandibular Movements Measuring System Using Double Stereo-Cameras (original) (raw)
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Recording and Measuring of Jaw Movements using a Computer Vision System
International Journal of Computer Applications, 2013
Human motion detection and analysis are important in many medical and dental clinics. Mandibular movements are very complex and difficult to detect by naked eyes. Detecting mandibular movements will aid in proper diagnosis, treatment planning and follow up. Many methods are utilized for measuring mandibular movements. However, most of these methods share the features of being very expensive and difficult to use in the clinic.
2009
The peculiar construction of the temporomandibular joint allows the mandible to move according to six degrees of freedom. In Dental Medicine, is essential to know this movement to simulate the temporomandibular joints, to position tooth moulds in articulators and to reproduce the mandibular movements in order to insure a satisfactory occlusion. In this work a facial arc, commonly used in Dental Medicine, was adapted to use electromagnetic sensors with the purpose of acquire the 3D mandibular movement. Some parts of the chosen facial arc were redesigned, and it was developed a specific support for the sensors employed. To visualise and analyse the acquired movement it was developed a software application using LabVIEW.
2007
The peculiar construction of the temporomandibular joint allows the mandible to move according to six degrees of freedom. In Dental Medicine, is essential to know this movement to simulate the temporomandibular joints, to position tooth moulds in articulators and to reproduce the mandibular movements in order to insure a satisfactory occlusion. In this work a facial arc, commonly used in Dental Medicine, was adapted to use electromagnetic sensors with the purpose of acquire the 3D mandibular movement. Some parts of the chosen facial arc were redesigned, and it was developed a specific support for the sensors employed. To visualise and analyse the acquired movement it was developed a software application using LabVIEW.
BMC Oral Health, 2020
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 ...
A computational method for recording and analysis of mandibular movements
Journal of Applied Oral Science, 2008
his study proposed the development of a new clinical tool capable of quantifying the movements of opening-closing, protrusion and laterotrusion of the mandible. These movements are important for the clinical evaluation of the temporomandibular function and muscles involved in mastication. Unlike current commercial systems, the proposed system employs a low-cost video camera and a computer program that is used for reconstructing the trajectory of a reflective marker that is fixed on the mandible. In order to illustrate the clinical application of this tool, a clinical experiment consisting on the evaluation of the mandibular movements of 12 subjects was conducted. The results of this study were compatible with those found in the literature with the advantage of using a low cost, simple, non-invasive, and flexible tool customized for the needs of the practical clinic.
BioMedical Engineering OnLine, 2013
Background: In the last years, several methods and devices have been proposed to record the human mandibular movements, since they provide quantitative parameters that support the diagnosis and treatment of temporomandibular disorders. The techniques currently employed suffer from a number of drawbacks including high price, unnatural to use, lack of support for real-time analysis and mandibular movements recording as a pure rotation. In this paper, we propose a specialized optical motion capture system, which causes a minimum obstruction and can support 3D mandibular movement analysis in real-time. Methods: We used three infrared cameras together with nine reflective markers that were placed at key points of the face. Some classical techniques are suggested to conduct the camera calibration and three-dimensional reconstruction and we propose some specialized algorithms to automatically recognize our set of markers and track them along a motion capture session.
Computer Visualization and Analysis of Human Jaw Motion
In this work, we present a realistic 3D-visualization model of the human masticatory system that has a significant impact on understanding the mechanics of the jaw motion. This is based on combining motion data, recorded with six degrees-of-freedom by a tracking system (Jaws-3D), with data extracted by segmentation of images produced by Magnetic Resonance Imaging (MRI) system. The results are further processed to establish a 3D-visualization of the overall anatomical structure and motion. Consequently, by employing a realistic representation of the anatomy and motion, a consistent dynamical model of the motion of the human jaw incorporating a system of forces acting on bony structures is achieved.
Estimation of the Temporomandibular Joint Position ∗
2002
Abstract. In dentistry there is a problem of measuring temporomandibular joint head (condyle) trajectory relative to the skull. In this paper we propose a noninvasive photogrammetric method for this measurement. A camera is aimed at two known targets, the first is attached to the upper teeth (that is on the skull), the second is mounted on the lower teeth (on the jawbone). The relative position of the targets is estimated by a camera autocalibration procedure using known points on the targets. The position and trajectory of the condyle, which is not directly measured, is calculated from the sequence of images.
A 3-D reconstruction system for the human jaw using a sequence of optical images
IEEE Transactions on Medical Imaging, 2000
This paper presents a model-based vision system for dentistry that will assist in diagnosis, treatment planning, and surgical simulation. Dentistry requires an accurate three-dimensional (3-D) representation of the teeth and jaws for diagnostic and treatment purposes. The proposed integrated computer vision system constructs a 3-D model of the patient's dental occlusion using an intraoral video camera. A modified shape from shading (SFS) technique, using perspective projection and camera calibration, extracts the 3-D information from a sequence of two-dimensional (2-D) images of the jaw. Data fusion of range data and 3-D registration techniques develop the complete jaw model. Triangulation is then performed, and a solid 3-D model is reconstructed. The system performance is investigated using ground truth data, and the results show acceptable reconstruction accuracy.