Optical Stereometric Analysis of An Experimental Partially-Edentulous Mandible (original) (raw)
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Optical aspect of deformation analysis in the bone-denture complex
Collegium antropologicum, 2012
The aim of this study was to register and measure any deformation of mandible models under load. The method for full field measurement of strain is done by using the ARAMIS three-dimensional image correlation system. The system uses two digital cameras that provide a synchronized stereo view of the specimen and the results show the complete strain field during the tests. The biggest deformation values were just under the working force of the biggest intensity 500 N, and for the region of the lower second premolar the deformation is 625 microm. The following study is presented that highlight the use of stereometric measuring system for modern research. It is shown that this measuring methodology can capture the trends of the experiments.
Photoelastic and Finite Element Analyses of Occlusal Loads in Mandibular Body
Anatomy Research International, 2014
This study proposed to evaluate the mandibular biomechanics in the posterior dentition based on experimental and computational analyses. The analyses were performed on a model of human mandible, which was modeled by epoxy resin for photoelastic analysis and by computer-aided design for finite element analysis. To standardize the evaluation, specific areas were determined at the lateral surface of mandibular body. The photoelastic analysis was configured through a vertical load on the first upper molar and fixed support at the ramus of mandible. The same configuration was used in the computer simulation. Force magnitudes of 50, 100, 150, and 200 N were applied to evaluate the bone stress. The stress results presented similar distribution in both analyses, with the more intense stress being at retromolar area and oblique line and alveolar process at molar level. This study presented the similarity of results in the experimental and computational analyses and, thus, showed the high importance of morphology biomechanical characterization at posterior dentition.
Analysing Displacement in the Posterior Mandible using Digital Image Correlation Method
Journal of Biochips & Tissue Chips, 2011
Background: Knowing the biomechanical consequences of the stresses generated to the supporting bone during occlusal loading is significant for improving design and clinical planning process in partial edentualism therapy. The objective of this study was to analyze the surface displacement field on partial dentate mandible rehabilitated with removable partial denture and to compare it to displacement field on partial dentate mandible rehabilitated with cantilever fixed partial denture. Material and Methods: The experimental models were partial dentate mandible with full-arch PFM crowns and removable partial denture and partial dentate mandible rehabilitated with full-arch cantilever fixed partial denture. Displacement were measured using Digital Image Correlation Method. Results: Displacement values of the removable partial denture-model were ranging from 0-1.50 mm. Analysis of the fixed partial denture-model results showed displacement values from 0.05-0.69 mm. Conclusion: Higher displacements of bone tissue were observed below the removable partial denture, especially in the region of distal abutment and distal portion of the free-end saddle. Displacements within bone and the bonedenture contact area were mostly influenced by the teeth and denture vertical movements.
Three-dimensional modeling of the human jaw/teeth using optics and statistics
2000
albedo information for the population. Using this database, a novel statistical shape from vi shading (SSFS) approach has been created. Extending the work on human teeth analysis, Finite Element Analysis (FEA) is adapted for analyzing and calculating stresses and strains of dental structures. Previous Finite Element (FE) studies used approximate 2D models. In this dissertation, an accurate three-dimensional CAD model is proposed. 3D stress and displacements of different teeth type are successfully carried out. A newly developed open-source finite element solver, Finite Elements for Biomechanics (FEBio), has been used. The limitations of the experimental and analytical approaches used for stress and displacement analysis are overcome by using FEA tool benefits such as dealing with complex geometry and complex loading conditions. vii
Surgical and Radiologic Anatomy, 2014
The mandibles were photographed using a camera coupled to a static support that was positioned 20 cm from the object to be photographed. The images were digitized and transferred to the Image J 1.42q software, in which the gonial angle of the mandible and the mandibular incisure angle were measured. Results There were no differences in the mandibular and mandibular incisure angles in relation to presence or absence of teeth, or between the right and left sides. The mandibular incisure angle was greater in the women. Conclusion Edentulousness did not cause remodeling of the gonial angle of the mandible or in the mandibular incisure angle.
The objective of this study was to analyse in vitro the stress distribution in craniofacial structures around zygomatic osseointegrated implants. Material and Methods: Synthetic polyurethane skulls replicas were used as templates for installation of standard and zygomatic implants performing two techniques using rehabilitation with zygomatic implants. These models were used as templates for the manufacture of photoelastic models keeping the same arrangement of implants. Were performed using variations of 1 zygomatic implants in each one zygomatic bone in combination with 2 and 4 standard implants in the anterior maxilla (Models 1 and 2). The skulls replicas of photoelastic resin were subjected to photoelastic analysis after linear loading using an Instron 4411 servohydraulic mechanical testing unit with a 2-mm displacement. Results: The stress distribution in the photoelastic analysis, the fringes were concentrated body and frontal process zygomatic bone. In the case of the model 1, higher concentrations of stress were found around the standard and zygomatic implants and surrounding bone. Conclusions: Under the conditions tested, the rehabilitation with 2 zygomatics implants with 4 standard implants (Model2) provided the most favorable behavior.
Journal of Oral and Maxillofacial Surgery, Medicine, and Pathology, 2018
A biomechanical analysis of fixation devices to repair fractures or osteotomies of the mandible is carried out in hemi-mandibles fixed in the condylar process, the force is applied in the molar region and a single movement is allowed. This technical note presents a new setup for evaluating the biomechanics of the mandible with the following improvements: (1) providing freedom of mobility in three axes in the space; (2) applying forces in a way that closely replicates that of real cases; (3) capable of evaluating the fracture resistance and the stiffness and elastic recovery. Method: A rigid metal support mounted on bearings was developed that allowed the movement and deformation of the mandible during load application to mimic its freedom of movement when in function. Steadying was only in the mandibular fossae and free in all other regions. Ten fresh sheep mandibles were subjected to testing of their rigidity and capacity for elastic recovery after a displacement of 0.75 mm. Results: After three displacement cycles, the mean value of stiffness was 506 ± 64 N/mm, and the mandibles showed visco-elastic recovery. Conclusion: This new apparatus and approach is promising for use in the evaluation of mandibular fixations.
Journal of Craniofacial Surgery, 2019
Tumors, trauma and infections are the main reasons for subjecting a patient to a bone reconstruction made with the use of bone grafts or prosthetic elements, using for example components such as osteosynthesis plates, meshes and screws for their stabilization. This study focuses on the photoelastic analysis of a customized prosthesis of the jaw for a patient diagnosed with osteonecrosis. A resin model was manufactured as follows: DICOM files were processed in ScanIP software to obtain an STL file that was used to generate an antagonist model of the healthy section of the jaw using CATIA software, then, models were printed in Acrylonitrile Butadiene Styrene (ABS). Following the resin casting technique, the printed model of the jaw was used to construct a resin model, which is tested to determine its mechanical behavior. After carrying out the photoelastic analysis, it was found that the assembly process generates stress concentration zones. Here, the stress reaches a maximum value after the application of a bite force of 130.9 N in the premolars. In this study near the premolars, 3 stress concentration zones were identified and overlap of stress fields is reveled. The results show the importance of planning in the design and assembly process to obtain the best results in the reconstruction, reducing in this way the risk of a surgical reoperation due to problems of rupture or loosening of the prosthesis.
The mandibles were photographed using a camera coupled to a static support that was positioned 20 cm from the object to be photographed. The images were digitized and transferred to the Image J 1.42q software, in which the gonial angle of the mandible and the mandibular incisure angle were measured. Results There were no differences in the mandibular and mandibular incisure angles in relation to presence or absence of teeth, or between the right and left sides. The mandibular incisure angle was greater in the women. Conclusion Edentulousness did not cause remodeling of the gonial angle of the mandible or in the mandibular incisure angle.