Transient and residual stresses occurring in partially fixed dental prostheses after the firing process can be calculated with elastic or elastic-plastic finite element analyses (FEA). In this study, firstly, the mechanical and thermal properties at various temperatures of the materials used in a porcelain fused metal (PFM) system were obtained by experimental and literature studies. The effects of viscoelastic and viscoplastic behaviours of the dental porcelain at the elevated temperatures were reflected onto its elastic properties. The equivalent heat transfer coefficients were determined experimentally by measuring temperatures and the results were supplied as input to the 3D finite elements analysis. It has been observed that the maximum stresses occur within a short time period after cooling begins and that stresses decrease during the cooling process and remain at a constant value at the end of cooling; these are the thermal residual stresses.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jbiomech.2009.05.027 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
In-Situ Cross-Linked Polymers for Enhanced Thermal Cycling Stability in Flexible Perovskite Solar Cells.
Angew Chem Int Ed Engl
December 2024
Key Lab for Special Functional Materials of Ministry of Education, National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology, School of Nanoscience and Materials Engineering, Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004, P. R. China.
Flexible perovskite solar cells (FPSCs) are a promising emerging photovoltaic technology, with certified power conversion efficiencies reaching 24.9 %. However, the frequent occurrence of grain fractures and interface delamination raises concerns about their ability to endure the mechanical stresses caused by temperature fluctuations.
View Article and Find Full Text PDFMolecular Evolution of Paralogous Cold Shock Proteins in E. coli: A Study of Asymmetric Divergence and Protein Functional Networks.
Mol Biotechnol
January 2025
Amity Institute of Biotechnology, Amity University, Kolkata, India.
Nine homologous Cold Shock Proteins (Csps) have been recognized in the E.coli Cold Shock Domain gene family. These Csps function as RNA chaperones.
View Article and Find Full Text PDFEvaluating interface pressure in a lower-limb prosthetic socket: Comparison of FEM and experimental measurements on a roll-over simulator.
J Biomech
January 2025
Arts et Métiers Institute of Technology, Université Sorbonne Paris Nord, IBHGC - Institut de Biomécanique Humaine Georges Charpak, HESAM Université, 151 boulevard de l'Hôpital, 75013 Paris, France. Electronic address:
Improper socket fitting in lower-limb prostheses can lead to significant complications, including pain, skin lesions, and pressure ulcers. Current suspension and socket design practices rely predominantly on visual inspection of the residual limb and patient feedback. Monitoring stress distribution at the residual limb/socket interface offers a more objective approach.
View Article and Find Full Text PDFToxicity assessment of DMSO extracts of environmental aged beached plastics using human cell lines.
Ecotoxicol Environ Saf
January 2025
Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Pessac F-33600, France. Electronic address:
Plastic products contain complex mixtures of chemical compounds that are incorporated into polymers to improve material properties. Besides the intentional chemical additives, other compounds including residual monomers and non-intentionnaly added substances (NIAS) as well as sorbed pollutants are usually also present in aged plastic. Since most of these substances are only loosely bound to the polymer via non-covalently interactions, i.
View Article and Find Full Text PDFThe effect of the type of anaesthesia on long-term outcomes after cancer resection surgery: a narrative review.
Anaesthesia
January 2025
EuroPeriscope, ESA-IC Onco-Anaesthesiology Research Group ESA_IC_RG_EP, Brussels, Belgium.
Background: The peri-operative period may create a biological environment conducive to cancer cell survival and dissemination. Microscopic residual tumours (micrometastases) can be dislodged even with excellent surgical technique. At the same time, the stress response from surgery can temporarily impair immune function and activate inflammatory processes, increasing the risk of tumour proliferation.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!