@article{Kishen2001b,

title = {Analysis on the nature of thermally induced deformation in human dentine by electronic speckle pattern interferometry (ESPI)},

author = {A Kishen and V M Murukeshan and V Krishnakumar and A Asundi},

doi = {10.1016/s0300-5712(01)00048-3},

issn = {0300-5712},

year  = {2001},

date = {2001-01-01},

journal = {Journal of Dentistry},

volume = {29},

issue = {8},

pages = {531-537},

abstract = {OBJECTIVE: To examine the in-plane and out-of-plane response of human dentine to thermal loads in real time. 

METHODS: An Electronic Speckle Pattern Interferometry (ESPI) system sensitive to both the in-plane and out-of-plane displacements was configured and used in conjunction with an advanced fringe processing technique. Specimens were prepared from freshly extracted lower central incisor teeth and were separately mounted on a thermal block to apply thermal loads from room temperature (25 degrees C) to 60 degrees C. The real time speckle patterns were acquired using a digital camera. These digital fringe patterns were subjected to further image processing to enhance the quality of fringes. The resultant images were later analyzed to study the out-of-plane and in-plane displacement gradients in the facio-lingual plane of the dentine. 

RESULTS: The out-of-plane deformations were observed in the plane perpendicular to the long axis of the tooth, while the in-plane deformations occurred in the plane parallel to the long axis of the tooth. 

CONCLUSION: The ESPI analysis revealed whole-field and distinct thermal response in human dentine in-plane and out-of-plane. The cervical dentine experienced distinct and conspicuous displacement to the temperature changes.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Asundi2000,

title = {A strain gauge and photoelastic analysis of in vivo strain and in vitro stress distribution in human dental supporting structures},

author = {A Asundi and A Kishen},

doi = {10.1016/s0003-9969(00)00031-5},

issn = {0003-9969},

year  = {2000},

date = {2000-01-01},

journal = {Archives of Oral Biology},

volume = {45},

issue = {7},

pages = {543-550},

abstract = {Strain gauge and photoelastic experiments have been workhorses of experimental stress analysis for over 50 years. In this study, both were used to analyse the nature of stress distribution from the tooth root surface to the supporting alveolar bone. Such studies help in understanding the behaviour of dental supporting structures under physiological function. In the strain gauge experiment, the mechanical strains were measured on the supporting bone surface and the root surface of the tooth under applied bite force. It was found that higher strains were distributed along the cervical region of the supporting bone and the root surface. The photoelastic study was also done to evaluate the stress distribution pattern from the root surface to the supporting bone under clinical conditions. The stress patterns were found to decrease from the cervical to the apical region of the root surface. These studies highlight the role of the periodontium in stress distribution and bone remodelling.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kishen2000,

title = {Experimental studies on the nature of property gradients in the human dentine},

author = {A Kishen and U Ramamurty and A Asundi},

doi = {10.1002/1097-4636(20000915)51:4\<650::aid-jbm13\>3.0.co;2-h},

issn = {0021-9304},

year  = {2000},

date = {2000-01-01},

journal = {Journal of Biomedical Materials Research},

volume = {51},

issue = {4},

pages = {650-659},

abstract = {We conducted an investigation into the nature of dentine mineralization and mechanical property gradients with the aid of experimental techniques such as the fluoroscopic X-ray microanalysis and instrumented microindentation, respectively. It was found that the tooth adapts to a complex structure with significant gradients in properties. We observed a significant correlation between the degree of mineralization within the dentine and the mechanical properties. The natural gradation in mechanical properties is explained by the stress analysis within anatomical-sized tooth specimens done using digital photoelasticity. These results are explained within the context of the functional requirements that are imposed on the tooth. This study highlights tooth structure as a biologically adapted, functionally graded material.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Asundi2000b,

title = {Stress distribution in the dento-alveolar system using digital photoelasticity},

author = {A Asundi and A Kishen},

doi = {10.1243/0954411001535688},

issn = {0954-4119},

year  = {2000},

date = {2000-01-01},

journal = {Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine},

volume = {214},

issue = {6},

pages = {659-667},

abstract = {Past research has confirmed that the governing factors in cellular modelling and remodelling adhere to sound principles of engineering mechanics. Hence studies of stress distributions would provide better understanding of the functional adaptation of dental supporting structures. Photoelasticity is an established experimental tool to study whole-field stress distribution in structures subjected to forces. However, it has certain limitations that make its application in biological specimens tedious. In this investigation an advanced digital photoelastic system is used to visualize and study the nature of the stress distribution in dental supporting structures. These digital fringe patterns are analysed using a phase-shift technique. The present biomechanical study shows that dental supporting structures exhibit a characteristic stress distribution, promoting structural adaptation based on needs. Furthermore, the advantage of using a digital image processing system along with the circular polariscope is discussed.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Asundi1999,

title = {Biomechanics of endodontic endosseous implants\textendasha comparative photoelastic evaluation},

author = {A Asundi and A Kishen},

doi = {10.1111/j.1600-9657.1999.tb00759.x},

issn = {0109-2502},

year  = {1999},

date = {1999-01-01},

journal = {Endodontics \& Dental Traumatology},

volume = {15},

issue = {2},

pages = {83-87},

abstract = {Dental biomechanics is an interdisciplinary study wherein engineering principles are used for the better understanding of clinical dentistry. The present biomechanical study was done to understand the mechanism by which an endodontic implant transmits occlusal forces to the surrounding bone. In this experimental study, photoelastic techniques were utilized to compare stress distribution patterns in the supporting bone of an intact tooth, a tooth with supporting bone loss, and a tooth stabilized using an endodontic endosseous implant. It was concluded that there were distinct variations in the biomechanics underlying various dental clinical conditions. Further, the implant did not appear to improve the stress distribution.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}