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Quintessence Publishing: Journals: JAD


The Journal of Adhesive Dentistry

Edited by Prof. Dr. Roland Frankenberger, Prof. Bart Van Meerbeek

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


May/June 2012
Volume 14 , Issue 3

Pages: 235 - 243
PMID: 22043472
DOI: 10.3290/j.jad.a22192
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The Effects of Aging on Shear Bond Strength and Nanoleakage Expression of an Etch-and-Rinse Adhesive on Human Enamel and Dentin

Hariri, Ilnaz / Shimada, Yasushi / Sadr, Alireza / Ichinose, Shizuko / Tagami, Junji

Purpose: To evaluate the effects of increasing thermocycling regimens on bond strength and nanoleakage of an etch-and-rinse adhesive. Materials and Methods: Adper Single Bond (3M ESPE) was used for bonding resin composite to human enamel and dentin. Specimens were stored in water (37C, 24 h) and subjected to thermocycling (5C and 55C) in five groups: 1. control (no thermal cycling), 2. 100, 3. 500, 4. 2000, or 5. 10,000 cycles. The microshear bond test was performed at a crosshead speed of 1 mm/min (n = 16). Nanoleakage specimens were immersed in silver nitrate and FE-SEM micrographs were digitally analyzed to calculate silver penetration in three samples. Results: The mean bond strength to enamel was not significantly affected by thermocycling. However, artificial aging decreased dentin bond strength in groups 4 and 5 compared to control. Weibull analysis indicated that the characteristic strength decreased gradually with aging in both substrates. All groups exhibited some nanoleakage, and a significant increase in silver penetration compared to the control was observed in enamel and dentin groups 2 to 5. Conclusion: A nanoleakage increase was detected in an earlier stage of aging than when a significant drop in bond strength was observed, with the dentin bond being more susceptible to deterioration. Keywords: dental adhesive, thermocycling, nanoleakage, bond strength

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