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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2016

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Mechanical properties of composite material modified with amorphous calcium phosphate

Drzewiecka K., Kleczewska J., Krasowski M., Sokołowski J., Łapińska B.

Journal of Achievements in Materials and Manufacturing Engineering

2016

Vol. 74, nr 1

22--28

Purpose: The purpose of the study was to evaluate mechanical and physical properties of composite materials modified with amorphous calcium phosphate (ACP). Design/methodology/approach: The study used two flowable composite materials: an experimental composite material based on dimetacrylic resin filled with colloidal silica (ECM) and commercially available composite material (SDR/Dentsply). Materials were modified with the addition of ACP as a powder. Three testing groups were created, depending on the amount of ACP – 0.12 g, 0.24 g and 0.36 g – added to 2 g of the basic composite. The composite without ACP was the control group. Diametral Tensile Strength (DTS) was evaluated using Zwick-Roell Z020. Vickers hardness test (HV1/10) was performed using the HV1/10 method in the ZHVμ (Zwick-Roell) hardness tester. The measurements of shrinkage stress that arose during polymerisation of the tested materials were conducted with the use of the FL200/Gunt circular polariscope. Findings: In both composites modified with ACP the decrease of DTS was observed. ACP addition to experimental composite increased its hardness. Addition of 5.67 wt% of ACP to SDR resulted in significant decrease of its hardness. For both tested materials, the highest shrinkage stress was observed in composites modified with 5.67 wt% ACP addition. The lowest shrinkage stress was observed in ECM modified with 15.25 wt% ACP and SDR composite containing 10.72 wt% ACP. Research limitations/implications: Additional investigations are needed to define the exact influence of addition ACP to composite materials on their mechanical and physiochemical properties. Originality/value: In order to improve biological behaviour of composite materials it is possible to modify those materials with the addition of remineralising agents like ACP.