Single-Crystalline Ceramic Whisker-Reinforced Carboxylic Acid-Resin Composites With Fluoride Release

Published

March 1, 2000

Author(s)

H H. Xu, F Eichmiller, Joseph M. Antonucci, Glenn M. Flaim

Abstract

Currently available glass ionomer, resin-modified glass ionomer and compomer materials are susceptible to brittle fracture and, therefore, are inadequate for use in stress bearing posterior restorations. In the present study, ceramic single-crystalline whiskers were mixed with fluorosilicate glass particles and used as fillers to reinforce experimental carboxylic acid-resin composites. The carboxylic acid was monofunctional methacryloyloxyethyl phthalate (MEP). Five mass fractions of whisker/(whisker + fluorosilicate glass), and corresponding resin/(resin + MEP), were evaluated. Four control materials were also tested for comparison: a glass ionomer, a resin-modified glass ionomer, a compomer, and a hybrid composite resin. Flexural specimens were fabricated to measure the flexural strength, elastic modulus, and work-of-fracture (an indication of toughness). Fluoride release was measured by using a fluoride ion selective electrode. The properties of whisker composites depended on the whisker/(whisker + fluorosilicate glass) mass fraction. At a mass fraction of 0.8, the whisker composite had a flexural strength in MPa (mean sd; n = 6) of (150 16), significantly higher than that of a glass ionomer (15 7) or a compomer control (89 18) (Tukey's multiple comparison test; family confidence coefficient = 0.95). Depending on the ratio of whisker fluorosilicate glass, the whisker composites had a cumulative fluoride release up to 60 % of that of a traditional glass ionomer. To conclude, combining ceramic whiskers and fluorosilicate glass in a carboxylic acid-resin matrix can result in fluoride releasing composites with significantly improved mechanical properties.

Citation

Operative Dentistry

Volume

25

Issue

No. 2

Pub Type

Journals

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Keywords

carboxylic acid, ceramic whisker, dental composite, fluoride release, reinforcement, strength

Citation

Xu, H. , Eichmiller, F. , Antonucci, J. and Flaim, G. (2000), Single-Crystalline Ceramic Whisker-Reinforced Carboxylic Acid-Resin Composites With Fluoride Release, Operative Dentistry, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851494 (Accessed October 14, 2025)