Sifat fisik hidroksiapatit sintesis kalsit sebagai bahan pengisi pada sealer saluran akar resin epoxy (Physical properties of calcite synthesized hydroxyapatite as the filler of epoxy-resin-based root canal sealer)

Abstract

Sifat fisik hidroksiapatit sintesis kalsit sebagai bahan pengisi pada sealer saluran akar resin epoxy (Physical properties of calcite synthesized hydroxyapatite as the filler of epoxy-resin-based root canal sealer) abstract Background: The filler addition to resin based sealers will enhance the physical properties of the polymer. Because of its biological properties, the synthetic hydroxyapatite (HA) has been proposed as filler for dental material such as composite resin. The calcite synthesized HA is the HA produced of calcite minerals that came from many Indonesian mining. Purpose: The aim of study was to determine the effect of different concentration of calcite synthesized HA as the filler of the epoxy-resin-based root canal sealer on the physical properties such as its contact angle, the film thickness and the microhardness. Methods: The crystal of the calcite synthesized hydroxyapatite with the size between 77.721-88.710 nm and the ratio of Ca/P 1.6886 were synthesized at Ceramic Laboratory, Mechanical Engineering, using wet method of hydrothermal microwave. The powders of the epoxy-resin were prepared by added the synthesized hydroxyapatite crystal in 5 different weight ratios (e.g.: HA-10%, HA-20%, HA-30%, HA-40% and HA-50%). Each of these was mixed with the paste of 3:1 ratio using spatula on a glass plate until homogen and then measuring the contact angle and the film thickness. Microhardness test was conducted after the mixture of experimental sealer was stored for 24 hrs at 37 oC to reach perfect polymerization. Results: All of contact angles were <90o and were not significantly different to each other (p= 0.510). All groups had a film thickness in accordance with ISO 6876 (<50 um) and with no statistical difference (p= 0.858). In the HA of 10%, 20%, 30% seen that the microhardness were increased, while in the HA-50% was decreased and in the HA-40% has the same microhardness to the control groups (HA-0%). Conclusion: Calcite synthesized HA as the filler did not affect contact angle and film thickness of the sealer. Microhardness of the epoxy-resin based sealer could be increased using maximum 30% of the calcite synthesized HA as the filler.