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- W2139414593 abstract "Objectives: The aim was to study dimensional time-dependence of resin/ionomer formulations from 5 min age to one month and to separate out the intrinsic setting shrinkage and hygroscopic expansion effects, by using non-aqueous and aqueous storage media, respectively. Methods: Materials studied included: A: resin-, B: metal- and C: polyphosphonate-modified glass-ionomer cements [GICs]; and controls of D: poly-acid modified composite [compomer]; and E: resin-composite. Separate specimen groups (n=5) were stored in different storage-media: (i) silicone fluid; (ii) de-ionized water. Experiments were repeated at 23 and 37°C. Volumetric changes of specimens (4 mm diameter × 6 mm height) were obtained via accurate mass measurements (to 10−4 g), using Archimedes principle, with silicone or water also used as the Archimedean fluid. These measurements were made periodically over a 30 day period, post fabrication. Results: In silicone at 23°C, all materials underwent further gradual intrinsic shrinkage (after 5 min from mix). This was highly significant (p<0.05) for the RM-GIC (A). At 37°C, however the RM-GIC expanded, indicating that its cure is temperature-sensitive. In water, at 23 and 37°C, the shrinkage was either partially offset (materials C, D, E), or replaced by appreciable expansions (materials A and B). Differences between RM-GIC (A) and MM-GIC (B) were significant (p<0.05). Significance: The deployment of dual storage media made an important contribution to the separate analysis of the volumetric changes due to the on-going setting chemistry in these systems and the time-dependent effects of an aqueous environment." @default.
- W2139414593 created "2016-06-24" @default.
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- W2139414593 date "2000-03-01" @default.
- W2139414593 modified "2023-10-16" @default.
- W2139414593 title "Dimensional changes of resin/ionomer restoratives in aqueous and neutral media" @default.
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- W2139414593 doi "https://doi.org/10.1016/s0109-5641(99)00098-6" @default.
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