Investigating the influence of process parameters in digital light processing method on the fatigue behavior of acrylate dental materials

Document Type : Research Paper

Authors

1 Technical and Vocational University

2 Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran

3 Isfahan university of technology

Abstract

Hypothesis: The digital light processing (DLP) method is one of the additive manufacturing. Although the resins used in the DLP process are commonly used in clinical applications, some of them lack experiential information and related to mechanical properties, such as fatigue behavior. The focus of the present research is to examine the effect of process setting of the DLP method on the fatigue life of acrylic dental materials. It is expected that the setting parameters have a significant effect on the curing of the resin and as a result the mechanical properties, especially the fatigue behavior of the samples made of acrylate dental materials by the DLP process. Layer thickness, exposure time and light intensity are considered as input parameters of DLP process.
Methods: A rotating bending fatigue test was conducted under a 0.6 bending stress and a frequency of 25 Hz. After that, to achieve the stress-life relationship, samples with longer and shorter fatigue life were placed in two different levels of fatigue stress (0.4 and 0.8 bending stress). In addition, analysis of variance (ANOVA) was used to examine the correlation between parameters and the effect coefficient of each parameter on the fatigue resistance of the printed samples.
Findings: A direct correlation between resin curing and the fatigue life of the fabricated samples was observed. Insufficient resin curing or over-curing led to a decrease in fatigue resistance of the samples. The longest fatigue life was achieved for the sample fabricated with the following parameter settings: layer thickness: 25 µm, exposure time: 2.8 seconds, and light intensity: 160 W/m2, with a value of 86459 cycles. The minimum fatigue life for the sample fabricated with the parameter settings: layer thickness: 100 µm, exposure time: 2.8 seconds, and light intensity: 160 W/m2, was obtained with a value of 48569 cycles.

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