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

• Main Authors: Karsten Klosa, Walid Shahid, Milda Aleknonytė-Resch, Matthias Kern
• Format: Article
• Language: English
• Published: MDPI AG 2020-06-01
• Series: Materials
• Subjects: core build-up material; saliva; silicone; cleaning; contamination; conditioning
• Online Access: https://www.mdpi.com/1996-1944/13/12/2880

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 (<i>n</i> = 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.