Strength and wear resistance of a dental glass-ionomer cement with a novel nanofilled resin coating

Lohbauer U, Krämer N, Siedschlag G, Schubert EW, Lauerer B, Müller FA, Petschelt A, Ebert J (2011)

Publication Type: Journal article

Publication year: 2011

Journal

Book Volume: 24

Pages Range: 124-128

Journal Issue: 2

Abstract

To evaluate the influence of different resin coating protocols on the fracture strength and wear resistance of a commercial glass-ionomer cement (GIC). Methods: A new restorative concept [Equia (GC Europe)] has been introduced as a system application consisting of a condensable GIC (Fuji LX GP Extra) and a novel nanofilled resin coating material (G-Coat Plus). Four-point fracture strength (FS, 2 × 2 × 25 mm, 14-day storage, distilled water, 37°C) were produced and measured from three experimental protocols: no coating GIC (Group 1), GIC coating before water contamination (Group 2), GIC coating after water contamination (Group 3). The strength data were analyzed using Weibull statistics. Three-body wear resistance (Group 1 vs. Group 2) was measured after each 10,000 wear cycles up to a total of 200,000 cycles using the ACTA method. GIC microstructure and interfaces between GIC and coating materials were investigated under SEM and CLSM. Results: The highest FS of 26.1 MPa and the most homogenous behavior (m = 7.7) has been observed in Group 2. The coated and uncoated GIC showed similar wear resistance until 90,000 cycles. After 200,000 wear cycles, the coated version showed significantly higher wear rate (ANOVA, P< 0.05). The coating protocol has been shown to determine the GIC fracture strength. Coating after water contamination and air drying is leading to surface crack formation thus significantly reducing the FS. The resin coating showed a proper sealing of GIC surface porosities and cracks. In terms of wear, the coating did not improve the wear resistance of the underlying cement as similar or higher wear rates have been measured for Group 1 versus Group 2.

Authors with CRIS profile

Involved external institutions

Justus-Liebig-Universität Gießen Germany (DE) Universidade da Região de Joinville (UNIVILLE) Brazil (BR) Friedrich-Schiller-Universität Jena Germany (DE)

How to cite

APA:

Lohbauer, U., Krämer, N., Siedschlag, G., Schubert, E.W., Lauerer, B., Müller, F.A.,... Ebert, J. (2011). Strength and wear resistance of a dental glass-ionomer cement with a novel nanofilled resin coating. American Journal of Dentistry, 24(2), 124-128.

MLA:

Lohbauer, Ulrich, et al. "Strength and wear resistance of a dental glass-ionomer cement with a novel nanofilled resin coating." American Journal of Dentistry 24.2 (2011): 124-128.

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