Mechanical properties of composite material modified with amorphous calcium phosphate

摘要

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 ZHVu (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.