TY - JOUR
T1 - Reductions in the effects of damping on stress concentration in premolars by post-endodontic restorations: A non-linear finite element study
AU - Lo, Y.-J.
AU - Chang, W.-J.
AU - Lee, S.-Y.
AU - Chang, K.-J.
AU - Lin, C.-T.
AU - Huang, H.-M.
N1 - Export Date: 9 August 2016
CODEN: PIHME
通訊地址: Huang, H. -M.; Graduate Institute of Biomedical Materials and Engineering, Taipei Medical University, 250 Wu-Hsing Street, Taipei 110, Taiwan; 電子郵件： [email protected]
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Mater, 24, pp. 1534-1538; Papadogiannis, Y., Lakes, R.S., Palaghias, G., Helvatjoglu- Antoniades, M., Papadogiannis, D., Fatigue of packable dental composites (2007) Dent. Mater, 23, pp. 235-242; Newman, M.P., Yaman, P., Dennison, J., Rafter, M., Billy, E., Fracture resistance of endodonti-cally treated teeth restored with composite posts (2003) J. Prosthetic Dentistry, 89, pp. 360-367; Pierrisnard, L., Bohin, F., Renault, P., Barquins, M., Corono-radicular reconstruction of pulpless teeth: A mechanical study using finite element analysis (2002) J. Prosthetic Dentistry, 88, pp. 442-448; Mollersten, L., Lockowandt, P., and Linden, L. A. A comparison of strengths of five core and post-and-core systems. Quintessence Int., 2002, 33, 140-149Asmussen, E., Peutzfeldt, A., Heitmann, T., Stiffness, elastic limit, and strength of newer types of endodontic posts (1999) J. Dentistry, 27, pp. 275-278; Cormier, C.J., Burns, D.R., Moon, P., In vitro comparison of the fracture resistance and failure mode of fiber, ceramic, and conventional post systems at various stages of restoration (2001) J. Prosthodontics, 10, pp. 26-36; Dietschi, D., Romelli, M., Goretti, A., Adaptation of adhesive posts and cores to dentin after fatigue testing (1997) Int. J. Prosthodontics, 10, pp. 498-507; Quintas, A.F., Dinato, J.C., Bottino, M.A., Aesthetic posts and cores for metalfree restoration of endodontically treated teeth (2000) Practical Periodontics Aesthetic Dentistry, 12, pp. 875-884; Huang, H.M., Tsai, C.Y., Lee, H.F., Lin, C.T., Yao, W.T., Chiu, W.T., Lee, S.Y., Damping effects on the response of maxillary incisor subjected to a traumatic impact force: A nonlinear finite element analysis (2006) J. Dentistry, 34, pp. 261-268; Helfer, A.R., Melnick, S., Schilder, H., Determination of the moisture content of vital and pulpless teeth. 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PY - 2009
Y1 - 2009
N2 - The aim of this study was to measure the structural damping constants of premolars after treatment with a cast Co-Cr post-core system or permanent root filling, and to evaluate the stress damping effects of these restored premolars. Both the damping ratio and the natural frequency (NF) of the cast Co-Cr post-core restored premolars and the permanent root-filled premolars were detected by in-vitro NF testing experiments. Unprepared premolars served as the control. The damping constants β of the samples were calculated from the measured damping ratios and natural frequencies. The measured damping constants β of the test premolars were then used for dynamic finite element (FE) analyses. Stress contours and damping effects of stresses in each treated type of premolar were computed and compared using ANSYS. The measured damping constants β were 0.75×10-5 for the unprepared premolars, 0.69×10-5 for the root-filled premolars with coronal restoration, and 0.72×10-5 for the cast Co-Cr post-core restored premolars. The unprepared intact premolars demonstrated the highest stress dissipation effects with a ratio of 29.3 per cent at the middle root opposite to the loading side. However, no stress dissipation effects were found in the premolars that had been restored with the cast Co-Cr post-core system. The FE analysis showed that metallic post treatment attenuated the damping properties of the premolar. The effects of damping on stress concentration were significantly lower in restored premolars than in untreated vital premolars. These findings suggest that future research on post material should take the damping property into consideration. © IMechE 2009.
AB - The aim of this study was to measure the structural damping constants of premolars after treatment with a cast Co-Cr post-core system or permanent root filling, and to evaluate the stress damping effects of these restored premolars. Both the damping ratio and the natural frequency (NF) of the cast Co-Cr post-core restored premolars and the permanent root-filled premolars were detected by in-vitro NF testing experiments. Unprepared premolars served as the control. The damping constants β of the samples were calculated from the measured damping ratios and natural frequencies. The measured damping constants β of the test premolars were then used for dynamic finite element (FE) analyses. Stress contours and damping effects of stresses in each treated type of premolar were computed and compared using ANSYS. The measured damping constants β were 0.75×10-5 for the unprepared premolars, 0.69×10-5 for the root-filled premolars with coronal restoration, and 0.72×10-5 for the cast Co-Cr post-core restored premolars. The unprepared intact premolars demonstrated the highest stress dissipation effects with a ratio of 29.3 per cent at the middle root opposite to the loading side. However, no stress dissipation effects were found in the premolars that had been restored with the cast Co-Cr post-core system. The FE analysis showed that metallic post treatment attenuated the damping properties of the premolar. The effects of damping on stress concentration were significantly lower in restored premolars than in untreated vital premolars. These findings suggest that future research on post material should take the damping property into consideration. © IMechE 2009.
KW - Damping ratio
KW - Finite element
KW - Premolar
KW - Stress
KW - After-treatment
KW - Damping constants
KW - Damping effect
KW - Damping property
KW - Dissipation effects
KW - Dynamic finite element
KW - FE analysis
KW - In-vitro
KW - Non-linear finite elements
KW - Post treatment
KW - Post-core system
KW - Post-endodontic restorations
KW - Stress contours
KW - Stress damping
KW - Structural damping
KW - premolar
KW - Chromium
KW - Finite element method
KW - Natural frequencies
KW - Restoration
KW - Stress analysis
KW - Stress concentration
KW - Thermoelectricity
KW - Stresses
KW - Damping
KW - article
KW - biological model
KW - computer simulation
KW - dental care
KW - dental surgery
KW - finite element analysis
KW - human
KW - in vitro study
KW - instrumentation
KW - mechanical stress
KW - methodology
KW - nonlinear system
KW - pathophysiology
KW - premolar tooth
KW - tooth crown
KW - vibration
KW - viscosity
KW - young modulus
KW - Bicuspid
KW - Computer Simulation
KW - Dental Restoration, Permanent
KW - Dental Stress Analysis
KW - Elastic Modulus
KW - Finite Element Analysis
KW - Humans
KW - Models, Biological
KW - Nonlinear Dynamics
KW - Post and Core Technique
KW - Stress, Mechanical
KW - Vibration
KW - Viscosity
U2 - 10.1243/09544119JEIM538
DO - 10.1243/09544119JEIM538
M3 - Article
SN - 0954-4119
VL - 223
SP - 555
EP - 565
JO - Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
JF - Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
IS - 5
ER -