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Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

February 2007
Volume 38 , Issue 2

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Influence of artificial aging on the fracture strength and stiffness of Targis/Vectris fixed partial dentures

Paolo Baldissara, DDS / Candida Parisi, DDS / Carlo Monaco, DDS / Roberto Scotti, MD, DDS

Pages: 153159
PMID: 17263155

Objective: To evaluate the effect of artificial aging on the fracture strength and stiffness of fiber-reinforced composite fixed partial dentures (FPDs).
Method and Materials: Twelve FPDs were replicated using Targis/Vectris resin composite (Ivoclar Vivadent) and randomly divided in 2 groups. Group A was artificially aged for 900 hours in a weathering machine using dry/wet cycles and 534 W/m2 irradiations with wavelengths ranging from 300 to 800 nm. Group B (control) was stored in 100% relative humidity at 37C 1C for 900 hours. The FPDs were luted on metal abutments with Variolink II resin cement (Ivoclar Vivadent). The flexure stress was applied on the pontic at a descending speed of 1.0 mm/min until complete failure. Fracture strength, stiffness, and number of cracks produced on the FPDs were statistically analyzed.
Results: Targis veneering material in the control group fractured at a mean of 913 130 N, whereas in the aged group it failed at a mean of 722 154 N (P = .042). The mean fracture load of aged FPD frameworks was slightly lower than that of the controls: 1,532 237 N and 1,578 257 N, respectively (P = .758). The stiffness at 400 N was not significantly different between the 2 groups. The number of cracks at Targis failure was higher in aged groups.
Conclusion: Accelerated aging significantly reduced the strength of the Targis veneering composite, increasing its brittleness; however, it had no effect on the inner Vectris framework. (Quintessence Int 2007;38:153159)

Key words: accelerated aging, fiber-reinforced composites, fixed partial dentures, flexural strength, metal-free restorations, polymer degradation

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