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Quintessence Publishing: Journals: JAD

 

The Journal of Adhesive Dentistry

Edited by Jean-François Roulet

ISSN (print) 1461-5185 • ISSN (online) 1757-9988

Publication:

January/February 2013
Volume 15 , Issue 1



Pages: 19 - 26
PMID: 23534026
DOI: 10.3290/j.jad.a28884
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Effect of Water Temperature on Cyclic Fatigue Properties of Glass-fiber-reinforced Hybrid Composite Resin and Its Fracture Pattern After Flexural Testing

Kuroda, Soichi / Shinya, Akikazu / Vallittu, Pekka K. / Nakasone, Yuji / Shinya, Akiyoshi

Purpose: To evaluate in vitro the influence of dynamic loading applied to a glass-fiber-reinforced hybrid composite resin on its flexural strength in a moist, simulated oral environment.
Materials and Methods: Three-point flexural strength specimens were subjected to cyclic loading in water at 37C and 55C to investigate the influence of immersion temperature on impact fatigue properties. Specimens were subjected to cyclic impact loading at 1 Hz for up to 5 105 cycles to obtain the number of cycles to failure, the number of unbroken specimens after 5 105 cycles, and the residual flexural strength of unbroken specimens. Maximum loads of 100, 200, and 300 N were chosen for both the non-reinforced and the glass-fiberreinforced hybrid composite resins.
Results: The mean residual flexural strength for 100 N impact loading at temperatures of 37C and 55C was 634 and 636 MPa, respectively. All specimens fractured at fewer than 5 105 cycles for loads of 200 and 300 N.
Conclusion: Reduced numbers of cycles to fracture and lower fatigue values were observed as both the maximum load and immersion temperature increased.

Keywords: glass fiber, hybrid composite resin, cyclic impact loading, water temperature, bending strength

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