Effect of immersion time in 2,5% sargassumpolycystum effervescent granule denture cleansing agent on the stability acrylic resin plate colour

Abstract

Sargassumpolycystumis one type of brown seaweed (Phaeopychae) which contains various pigment content such as beta carotene, chlorophyll a and b, and fucoxanthin. Acrylic resin has the porosity and the ability to absorb liquids that can cause discoloration. The purpose of this study was to investigate the colour stability of heat cured acrylic resin plate after immersed in Sargassumpolycystum effervescent granule. This is a laboratory experimental research with a pretest-post test with control group design. The samples are 27 pieces of 20 mm x 10 mm x 2 mm acrylic bars. Samples were divided into 9 groups containing three negative control groups mineral water, there positive control groups Sodium perborate (polident), an d three groups of Sargassumpolycystum 2, 5% filtrate groups. The immersions were performed in the room temperature for 5, 10, and 15 minutes for every control group. Discolorations of each group were measured using a colorimeter. Statistical tests for this research were independent t-test. Colour change of the acrylic resin plate after immersed in dental prosthesis cleansing agent made from effervescent granule of Sargassumpolycystum 2, 5% occurred because of the increase of microporosity on the surface of the rough plate which made pigment micromolecules more attached so that the color of acrylic plate became brown (p<0.05). Acrylic resin plate color changed after immersed in 2, 5% Sargassumpolycystum granules at 10 and 15 minutes.

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