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VOLUME 7 , ISSUE 4 ( September, 2006 ) > List of Articles


Fiber-reinforced Composite Substructure: Load-bearing Capacity of an Onlay Restoration and Flexural Properties of the Material

Lippo V.J. Lassila, Pekka K. Vallittu, Sufyan K. Garoushi, Arzu Tezvergil

Citation Information : Lassila LV, Vallittu PK, Garoushi SK, Tezvergil A. Fiber-reinforced Composite Substructure: Load-bearing Capacity of an Onlay Restoration and Flexural Properties of the Material. J Contemp Dent Pract 2006; 7 (4):1-8.

DOI: 10.5005/jcdp-7-4-1

License: CC BY-NC 3.0

Published Online: 01-01-2008

Copyright Statement:  Copyright © 2006; The Author(s).



The aim of this study was to determine the static load-bearing capacity of composite resin onlay restorations made of particulate filler composite (PFC) with two different types of fiber-reinforced composite (FRC) substructures. In addition, flexural properties of the material combination and the effect of polymerization devices were tested.

Methods and Materials

Specimens were prepared to simulate an onlay restoration, which consisted of 2 to 3 mm of FRC layer as a substructure (short random and continuous bidirectional fiber orientation) and a 1 mm surface layer of PFC. Control specimens were prepared from plain PFC. In Group A the specimens were incrementally polymerized only with a hand-light curing unit for 40 s, while in Group B the specimens were post-cured in a light-curing oven for 15 min before they were statically loaded with a steel ball.

Bar-shaped test specimens were prepared to measure the flexural properties of material combination using a three-point bending test (ISO 10477).


Analysis of variance (ANOVA) revealed all specimens with a FRC substructure have higher values of static load-bearing capacity and flexural properties than those obtained with plain PFC (p<0.001).


The load-bearing capacity of all the specimens decreased after post-curing and water storage.

Restorations made from a material combination of FRC and PFC showed better mechanical properties than those obtained with plain PFC.


Garoushi SK, Lassila LVJ, Tezvergil A, Vallittu PK. Fiber-reinforced Composite Substructure: Loadbearing Capacity of an Onlay Restoration and Flexural Properties of the Material. J Contemp Dent Pract 2006 September;(7)4:001-008.

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