<I>In vitro </I>permeability of etch-and-rinse and self-etch adhesives used for immediate dentin sealing

Abstract

To investigate the permeability of deep dentin following immediate sealing with different etch-and-rinse and self-etch adhesives (Single Bond 2, Adper Prompt L-Pop, Clearfil Protect Bond, Clearfil S3 Bond, G-Bond) and a dentin desensitizer (Gluma). Fluidtransport model was used to measure fluid conductance during and after application of adhesives. Polyvinylsiloxane impressions of bonded dentin were taken to monitor fluid transudation from the surface of the adhesives. The area and number of dentinal fluid droplets and/or blisters were calculated using image analysis. None of the adhesives were able to block fluid conductance completely. The fluid conductance values of the adhesives displayed the following statistical ranking (p<0.05): G-Bond≤Clearfil Protect Bond<Smear-layer-covered dentin<S 3 Bond≤Single Bond 2≤Adper Prompt L-Pop<Gluma Desensitizer<Acid-etched dentin. Highly significant correlation was observed between the permeability of the tested adhesives and the area fraction of fluid droplets/blisters on the adhesive surfaces (r=0.99, p<0.01).

Correlation between microleakage and screw loosening at implant-abutment connection

“…These factors may alter detorque values in-vivo creating slippery environment. Despite there are several ways of determining microleakage at the connection area16,18-20 we used a modified filtration method in-vitro to mimic a lubricated surface using deionized water with pressure 14…”

“…To measure the leakage at implant-abutment interface of implant-internal hex zirconium (I-IhZ), implant-internal hex titanium (I-IhT) and implant-morse tapered titanium (I-MTtT), a modified fluid filtration method was used 14. The parts of the filtration model (tubes, micropipettes, buffer, and etc.)…”

Effect of dentin desensitizers on resin cement bond strengths

“…The exposure of the dentin tubules is inevitable during cavity or crown preparations [20]. Once the tubules are opened, they act as channels that transmit mechanical, chemical and bacterial stimuli to t he pulp [18].…”

Effect of biofilm formation, and biocorrosion on denture base fractures

“…2). The images were transferred to a personal computer to calculate total area and area fractions of biofilms using Image J software 16. Since cleaning and dehydrating processes were performed accurately, the area aspects apart from denture surface were all accepted as biofilm surface of that microorganism.…”