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BioMed Research International
Volume 2017 (2017), Article ID 1207208, 8 pages
Research Article

Long-Term Bond Strength of Two Benzalkonium Chloride-Modified Adhesive Systems to Eroded Dentin

Department of Preventive, Restorative, and Pediatric Dentistry, School of Dental Medicine, University of Bern, Freiburgstrasse 7, 3010 Bern, Switzerland

Correspondence should be addressed to Simon Flury

Received 20 April 2017; Revised 15 June 2017; Accepted 6 July 2017; Published 10 August 2017

Academic Editor: Salvatore Sauro

Copyright © 2017 Simon Flury et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study investigated the effect of benzalkonium chloride (BAC) modification of two adhesive systems on long-term bond strength to normal and artificially eroded dentin. A total of 128 extracted human molars were sectioned and the buccal and oral surfaces of each molar were ground until the dentin. One half was left untreated (normal dentin) while the other half underwent artificial erosion. Resin composite was bonded to the buccal or oral surface following treatment with Adper Scotchbond 1XT or OptiBond FL without or with 1% BAC incorporation. Shear bond strength (SBS) was measured after 24 h (100% humidity, 37°C) or 1 year (tap water, 37°C). SBS results were statistically analyzed ( = 0.05). SBS was significantly lower to artificially eroded dentin than to normal dentin (). Storage for 1 year had no effect on SBS to normal dentin but led to a significant decrease in SBS to artificially eroded dentin (). BAC incorporation decreased the 24 h SBS to normal dentin (), increased the 24 h SBS to eroded dentin (), and had no effect on the 1-year SBS for either substrate. Consequently, BAC incorporation did not improve bond durability.