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Variables affecting ion release from resin-based materials containing calcium orthophosphate particles
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NETL
NSTL
Elsevier
Objectives: To investigate the influence of experimental variables on Ca2+ release from experimental resin-based materials containing dicalcium phosphate dihydrate (DCPD) particles. Methods: Experimental materials were prepared, both with BisGMA and TEGDMA and either 25 % or 50 % DCPD (by volume). Ca2+ release in deionized water (DW) was quantified using induced coupled plasma-optical emission spectrometry (ICP-OES, n = 3) according to the variables (1) frequency of DW renewal (weekly, biweekly, monthly or no renewal in 8 weeks), (2) volume of DW (5 mL, 10 mL or 50 mL) and (3) specimen dimensions (in mm, 9x2, 10x1, 5x4 or 5x1). Release kinetics was described using the semi-empirical Peppas-Sahlin model. Data were analyzed by two-way ANOVA/Tukey test (alpha: 5 %). Results: Weekly and/or biweekly DW renewal increased Ca2+ release compared to monthly and no renewal (p < 0.001). Ca2+ release was higher in 50 mL compared to 10 mL (50 % DCPD) and 5 mL (25 % DCPD) (p < 0.001). The specimen with the highest area-to-volume ratio (5x1 mm) presented the highest release expressed in mu g/cm(2) or as fractional (i.e., % of the total Ca in the specimen, p < 0.001). At early stages and high DW volumes, diffusion was the main release mechanism, particularly for the 25 % DCPD material. Polymer relaxation becomes more important than diffusion over time, most noticeably for the 50 % DCPD material. Significance: Researchers and clinicians must be aware of the fact that ion release is influenced by a large number of experimental variables, including (but not limited to) immersion medium renewal frequency, volume of immersion medium and specimen dimensions.
Ion releaseCompositesCalcium orthophosphatesDIFFUSIONRELAXATION
Mesquita, Filipe Teles Ximenes、Vilela, Handially dos Santos、Trinca, Rafael Bergamo、Braga, Roberto Ruggiero
NETL
NSTL
Elsevier
