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33 results on '"TenCate J"'

11. Nonlinear Resonant Ultrasound Spectroscopy (NRUS) Applied to Damage Assessment in Bone.

Author

Muller, M., Tencate, J. A., Darling, T. W., Sutin, A., Guyer, R. A., Talmant, M., Laugier, P., and Johnson, P. A.

Subjects
*SPECTRUM analysis, *X-ray spectroscopy, *DIAGNOSTIC imaging, *BONES, *MEDICAL imaging systems, *ULTRASONICS
Abstract

This study shows for the first time the feasibility of Nonlinear Resonant Ultrasound Spectroscopy (NRUS) techniques for damage characterization in bone. Two diaphysis of bovine bone were subjected to a progressive damage experiment. Fatigue damage was progressively induced in the samples by mechanical testing in 11 steps. At each damage step, the nonlinear elastic parameter was measured using NRUS. For independent assessment of damage, high energy X-ray CT imaging was performed, but only helped in the detection of the prominent cracks. As the amount of damage accumulation increased, a corresponding increase in the nonlinear response was observed. The measured nonlinear response is much more sensitive than the change in modulus. The results suggest that NRUS could be a potential tool for micro-damage assessment in bone. Further work has to be carried out for a better understanding of the physical nature of damaged bone, and for the ultimate goal of in vivo implementation of the technique. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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12. The effect of crack orientation on the nonlinear interaction of a Pwave with an Swave

Author

TenCate, J. A., Malcolm, A. E., Feng, X., and Fehler, M. C.

Abstract

Cracks, joints, fluids, and other pore‐scale structures have long been hypothesized to be the cause of the large elastic nonlinearity observed in rocks. It is difficult to definitively say which pore‐scale features are most important, however, because of the difficulty in isolating the source of the nonlinear interaction. In this work, we focus on the influence of cracks on the recorded nonlinear signal and in particular on how the orientation of microcracks changes the strength of the nonlinear interaction. We do this by studying the effect of orientation on the measurements in a rock with anisotropy correlated with the presence and alignment of microcracks. We measure the nonlinear response via the traveltime delay induced in a low‐amplitude Pwave probe by a high‐amplitude Swave pump. We find evidence that crack orientation has a significant effect on the nonlinear signal. The total nonlinear signal is strongly influenced by crack orientationP/S wave interactions open up the possibility of better imaging of cracksImaging the nonlinear interaction of waves can be done with propagating waves, not just in resonance

Published
2016
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31. Child dental anxiety, parental rearing style and dental history reported by parents.

Author

Krikken JB, Vanwijk AJ, Tencate JM, and Veerkamp JS

Subjects
Adolescent, Child, Child, Preschool, Dentist-Patient Relations, Female, Humans, Male, Surveys and Questionnaires, Dental Anxiety etiology, Parenting, Parents psychology
Abstract

Aim: To examine the relationship between self-reported parental rearing style, parent's assessment of their child's dental anxiety and the dental history of children., Materials and Methods: Parents of primary school children were asked to complete questionnaires about their parenting style, using four different questionnaires. Parents also completed the Child Fear Survey Schedule Dental Subscale (CFSS-DS) on behalf of their child and a questionnaire about the dental history of their child., Results: 454 interview forms were available for analysis. Minor associations were found between dental anxiety and parenting style. Anxious parents were more permissive and less restrictive in their parenting style. Parents of children who did not visit their dentist for regular check-ups reported more laxness and less restrictiveness. Children who had a cavity at the time of investigation, children who had suffered from toothache in the past and children who did not have a nice and friendly dentist reported more dental anxiety., Conclusion: No clear associations between parenting style and dental anxiety were found. Known causes of dental anxiety were confirmed.

Published
2013

32. The effect of stromelysin-1 (MMP-3) on non-collagenous extracellular matrix proteins of demineralized dentin and the adhesive properties of restorative resins.

Author

Boukpessi T, Menashi S, Camoin L, Tencate JM, Goldberg M, and Chaussain-Miller C

Subjects
Adolescent, Child, Dentin chemistry, Dentin ultrastructure, Extracellular Matrix Proteins genetics, Humans, Integrin-Binding Sialoprotein, Matrix Metalloproteinase 3 analysis, Matrix Metalloproteinase 3 genetics, Molecular Weight, Osteopontin analysis, Osteopontin chemistry, Osteopontin metabolism, Proteoglycans chemistry, Proteoglycans metabolism, Recombinant Proteins metabolism, Sialoglycoproteins chemistry, Sialoglycoproteins metabolism, Time Factors, Adhesives metabolism, Dentin metabolism, Extracellular Matrix Proteins metabolism, Matrix Metalloproteinase 3 metabolism, Resins, Synthetic metabolism
Abstract

Dentin non-collagenous matrix components (NCPs) are structural proteins involved in the formation, the architecture and the mineralization of the extracellular matrix (ECM). We investigated here how recombinant metalloproteinase stromelysin-1, also termed MMP-3, initiates the release of ECM molecules from artificially demineralized human dentin. Analysis of the supernatants by Western blotting reveals that MMP-3 extracts PGs (decorin, biglycan), and also a series of phosphorylated proteins: dentin sialoprotein (DSP), osteopontin (OPN), bone sialoprotein (BSP) and MEPE, but neither dentin matrix protein-1 (DMP1), another member of the SIBLING family, nor osteocalcin (OC), a non-phosphorylated matrix molecule. After treatment of dentin surfaces by MMP-3, scanning electron microscope (SEM) examination of resin replica shows an increased penetration of the resin into the dentin tubules when compared to surfaces only treated by demineralizing solutions. This preclinical investigation suggests that MMP-3 may be used to improve the adhesive properties of restorative materials.

Published
2008
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