A novel light-cured glass-ionomer system for improved dental restoratives |
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Authors: | Dong Xie Jun Zhao Jong-Gu Park |
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Affiliation: | (1) Department of Biomedical Engineering, Purdue School of Engineering and Technology, Indiana University-Purdue University at Indianapolis, Indianapolis, IN 46202, USA |
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Abstract: | A novel light-cured glass-ionomer cement (LCGIC) system based on the 4-arm star-shape poly(acrylic acid) (AA) tethered with
glycidyl methacrylate has been developed. The 4-arm poly(AA) polymer was synthesized using atom-transfer radical polymerization.
The purified polymer was used to formulate with water and Fuji II LC filler to form LCGICs. Compressive strength (CS) was
used as a screening tool for evaluation. The effects of grafting ratio, polymer/water (P/W) ratio, filler powder/polymer liquid
(P/L) ratio and aging on strengths were investigated. All the specimens were conditioned in distilled water at 37 °C for 24 h
prior to testing. The results show that the 4-arm poly(AA) polymer exhibited a lower viscosity as compared to its linear counterpart
that was synthesized via conventional free-radical polymerization. This novel LCGIC system was 13% in CS, 86% in diametral
tensile strength (DTS) and 123% in flexural strength higher but 93.6% in shrinkage lower than Fuji II LC. Increasing P/W ratio
significantly increased both CS and DTS. Upon increasing grafting ratio, the CS was increased from 35% to 50% but not from
50% to 70%. Likewise, when P/L ratio was increased, the CS was increased from 2.2 to 2.7 but not from 2.7 to 3.0. During aging,
the ultimate CS (MPa) was significantly increased from 209.2 at 1 h to 329.7 at 1 week. It appears that this novel LCGIC system
will be a better dental restorative because it demonstrated improved mechanical strengths as well as little shrinkage and
may eliminate cytotoxicity in current LCGICs caused by leached HEMA. |
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