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

Abstract

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.

Treatment of saliva contamination of resin core foundation before adhesive luting

“…For bonding of resin core foundation in dental practice, a more chemical adhesive should be used to ensure proper fit of the prosthesis during the luting procedure. Contamination of the resin core foundation surface inhibits the wetting of the adhesive and, given the surface characteristics of the substrate, reduces the probability of chemical interaction 8) .…”

“…One is that the glycoproteins in saliva adhere to adherent surfaces by a chemical bonding process, rendering the adherent surface unsuitable for adhesion by resin luting cement 7) . A previous study suggested that cleaning the salivacontaminated core foundation material surfaces with alumina-particle air abrasion results in statistically significantly higher bond strength than cleaning with phosphoric acid etching 8) . Various ways can be used to clean the adherent surfaces from contamination.…”

Clinical performance of laminate veneers: A review of the literature

“…Conversely, multiple clinical trials have indicated no significant differences in survival and success rates were found between teeth with existing composite fillings and those without [39,44,58]. In addition, several in vitro studies suggested that employing appropriate surface treatment methods for polymerized composites, including airborneparticle abrasion with alumina particles and the application of silane, can enhance the bond strength to resin luting agents [59,60].…”

Longevity of metal-ceramic single crowns cemented with self-adhesive resin cement: An update of a prospective analysis with up to 106 months of follow-up

“…Given the similarity of composition between the resin cement and resin composite of the prosthetic core, it is possible to predict an excellent bond strength at this interface, although the operative steps should be considered as possible modi ers of the adhesive surface of the core in uencing the bond between these two materials [11]. Even so, the weak link of adhesive cementation of the bilayer crown with metallic infrastructure is still the interface between resin cement and metallic alloy.…”