Journal article

Publication year: 2021

Pages: 52-60

Journal: Dental Materials Journal

Volume number: 40

Issue number: 1

ISSN: 0287-4547

Open access status: Gold

DOI Link: https://doi.org/10.4012/dmj.2019-373

Publisher: Japanese Society for Dental Materials and Devices

Abstract: 
As shown in previous studies within other scientific fields, the material behavior of polymethyl methacrylate (PMMA) is viscoelastic-viscoplastic. However, in dental biomaterial science it is mostly considered as linear elastic or elastic-plastic. The aim of the present study was to evaluate, whether the assumption of elastic or elastic-plastic material behavior for PMMA is a practicable simplification or a potential source of error, especially considering clinical loading conditions. Telio-CAD was tested in three-point bending tests with different test velocities to examine the material behavior at different initial loading rates. Additionally, a dynamic-mechanical-thermal-analysis at different frequencies and temperatures was used. Here, a significant influence of loading rate and temperature as well as stress relaxation and creep were observed. To describe the rate-dependency of the elastic modulus, a new model was created, from which the elastic modulus can be calculated with a given strain rate. This model was validated using linear elastic finite element analysis.

Harvard Citation style: Schmidt, A., Schrader, P., Frendel, K., Schlenz, M., Woestmann, B. and Kolling, S. (2021) Is the assumption of linear elasticity within prosthodontics valid for polymers? -An exemplary study of possible problems, Dental Materials Journal, 40(1), pp. 52-60. https://doi.org/10.4012/dmj.2019-373

APA Citation style: Schmidt, A., Schrader, P., Frendel, K., Schlenz, M., Woestmann, B., & Kolling, S. (2021). Is the assumption of linear elasticity within prosthodontics valid for polymers? -An exemplary study of possible problems. Dental Materials Journal. 40(1), 52-60. https://doi.org/10.4012/dmj.2019-373