The Influence of Amorphous Calcium Phosphate Addition on Mechanical Properties of the Experimental Light-Cured Dental Composite

  • Drzewiecka K
  • Kleczewska J
  • Krasowski M
  • et al.
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Abstract

© 2016 by Wroclaw Medical University and Polish Dental Society. Background. Currently available composite materials are widely used in many branches of dentistry. The development of polymer engineering allows for the modification of these materials’ composition by adding substances which remineralize enamel and dentin, such as amorphous calcium phosphate (ACP). However, the question arises whether the addition of ACP to composite materials will have an impact on their physical and chemical properties. Objectives. The aim of the study was to evaluate the mechanical properties of an experimental ACP-modified dental composite. Material and Methods. The study used an experimental semi-flow composite material based on dimetacrylic resins BisGMA and TEGDMA (60:40) filled with colloidal silica and ACP as powder. Three study groups (n = 13) were created, depending on the amount of ACP added to the basic composite. The experimental composite without ACP was the control group. Roller-shaped samples 3 mm high and of 5 mm in diameter were prepared by filling the silicone matrix with the obtained composite paste in two layers. The material was light-cured with a LED polymerization lamp. Diametral tensile strength (DTS) was tested using Zwick Roell Z020 device with transverse bar movement velocity at 2 mm/min. Ten samples in each group were examined. The hardness of samples was evaluated using the HV1/10 method in the ZHVμ (Zwick-Roell) hardness tester. From each group 3 samples were tested, hardness was measured fivefold for each sample. Results. The highest value of DTS was obtained for the composite with the highest content of ACP (15.25% wag.) and the lowest value for the composite with 10.7% content of ACP; still both values were lower than for the control group, but those differences were not statistically significant. The greatest hardness was obtained for the composite with the highest amount of ACP and the lowest hardness for the material without ACP. Conclusions. Addition of ACP to the composite material significantly increases its hardness, but does not influence its durability.

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Drzewiecka, K., Kleczewska, J., Krasowski, M., Łapińska, B., & Sokołowski, J. (2016). The Influence of Amorphous Calcium Phosphate Addition on Mechanical Properties of the Experimental Light-Cured Dental Composite. Dental and Medical Problems, 53(1), 34–40. https://doi.org/10.17219/dmp/61059

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