Mechanical stability of adhesives under water storage

Manso, Adriana P.; Bedran-Russo, Ana K.; Suh, Byoung; Pashley, David H.; Carvalho, Ricardo M.

doi:10.1016/j.dental.2008.12.006

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Volume 25, Issue 6 , Pages 744-749, June 2009

Mechanical stability of adhesives under water storage

Adriana P. Manso
- Department of Operative Dentistry, College of Dentistry, University of Florida, Gainesville, FL, USA
- Department of Dental Materials, School of Dentistry, University of São Paulo, SP, Brazil
- Corresponding author at: University of Florida, College of Dentistry, Department of Operative Dentistry, 1600 SW Archer Rd, D9-6, PO Box 100415, Gainesville, FL 32610-0415, USA. Tel.: +1 352 273 5841.
Ana K. Bedran-Russo
- Department of Restorative Dentistry, School of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
Byoung Suh
- Department of Research and Development, Bisco Inc., Schaumburg, IL, USA
David H. Pashley
- Department of Oral Biology, School of Dentistry, Medical College of Georgia, Augusta, GA, USA
Ricardo M. Carvalho
- Department of Operative Dentistry, College of Dentistry, University of Florida, Gainesville, FL, USA
- Department of Prosthodontics, Bauru School of Dentistry, University of Sao Paulo, Bauru, SP, Brazil

Received 14 April 2008; received in revised form 18 December 2008; accepted 18 December 2008.

Abstract

Objectives

To evaluate the effects of storage condition (wet or dry) and storage time (24h and 3 months) on the ultimate tensile strength (UTS) of Single Bond (SB), 3M-ESPE; Opti Bond Solo Plus (OB), Kerr; One Step (OS), Bisco, and Prime & Bond NT (PB), Dentsply adhesive resins.

Methods

Hourglass-shaped specimens were obtained from a metallic matrix. Each adhesive was dispensed to fill the molds completely and left undisturbed in a dark chamber for 4min at 37°C for solvent evaporation. They were individually light-cured for 80s at 500mW/cm² and randomly divided into three groups: 24h of water storage; 3 months of water storage; 3 months of dry storage. The specimens were tested in tension at 0.5mm/min using the microtensile method and data were analyzed by two-way ANOVA and SNK tests for each material.

Results

Water storage for 3 months did not cause significant changes in the UTS of any of the adhesives (p-value). Values for water storage ranged from 25.9MPa for Single Bond at 24h to 32.7MPa for Prime & Bond NT after 3 months. Dry storage for 3 months yielded significantly higher UTS for most adhesives, which ranged from approximately 20% for Opti Bond to 160% higher values for Single Bond compared to their 3 months wet storage values.