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Open AccessArticle

Cleaning and Conditioning of Contaminated Core Build-Up Material before Adhesive Bonding

Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University, 24105 Kiel, Germany
Institute of Medical Informatics and Statistics, University Hospital Schleswig-Holstein, Campus Kiel, 24105 Kiel, Germany
Author to whom correspondence should be addressed.
Materials 2020, 13(12), 2880;
Received: 26 May 2020 / Revised: 20 June 2020 / Accepted: 22 June 2020 / Published: 26 June 2020
The objective of this study was to evaluate the effects of different cleaning and conditioning procedures after contamination on the tensile bond strength (TBS) of a luting resin to a core build-up composite resin. Specimens (n = 384) made of a core build-up material were stored for 3 weeks in 37 °C water. Half of the specimens were contaminated with saliva and a disclosing silicone and then cleaned either using phosphoric acid, a pumice suspension, air-abrasion with alumina or polishing powder. Surface conditioning was performed by either using a dentin adhesive, a silane containing primer or a composite resin primer, which resulted in 24 unique combinations of 16 specimens per group. Before measuring TBS, half of the specimens of each group were stored in 37 °C water for 3d or were artificially aged for 150 days. Results show that cleaning with pumice or air-abrasion are superior methods compared to using a polishing powder or phosphoric acid. Silane is an inferior conditioning agent compared to composite or dentin primers. Ideally, after contamination, bonding surfaces should be cleaned with a pumice suspension and conditioned with a dentin adhesive. Those surfaces could also be cleaned and conditioned with air-abrasion with alumina particles and a composite resin primer. View Full-Text
Keywords: core build-up material; saliva; silicone; cleaning; contamination; conditioning core build-up material; saliva; silicone; cleaning; contamination; conditioning
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Klosa, K.; Shahid, W.; Aleknonytė-Resch, M.; Kern, M. Cleaning and Conditioning of Contaminated Core Build-Up Material before Adhesive Bonding. Materials 2020, 13, 2880.

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