Effect of adhesive system and application strategy on reduction of dentin permeability

Abstract

This study evaluated the effect of adhesive systems and application strategies on dentin hydraulic conductance (HC). The buccal enamel was removed from bovine incisors to simulate laminate cavity preparations. After removing the roots and the coronal pulp, the buccal dentin was treated with EDTA solution (0.5 M) for 5 minutes, rinsed, ultrasonicated for 12 minutes and connected to a permeability device. HC of the specimens was measured at 10 psi (n = 5). Permeability was measured before and after bonding procedures using G-Bond (GB), Clearfil Tri-S Bond (CTS), Hybrid Coat (HY), Bond Force (BF), Adper Easy Bond (AEB) Silorane (SI), Clearfil SE Bond (CSE) and Adper Scotchbond Multi-Purpose (SMP) adhesives systems, which were applied following three strategies: 1) according to the manufacturers' instructions; 2) two coats of all-in-one self-etching adhesives (GB, CTS, HY, BF, AEB) or priming step plus two coats of bonding resin for the other systems (SI, CSE and SMP); and 3) a thin layer of a flowable composite applied over one coat of all-in-one self-etching adhesives or primed surface for SI, CSE and SMP adhesives. No significant difference was observed among the application modes concerning their ability to reduce HC. None of the adhesives showed complete sealing (100%) of the bovine tooth dentin. SI exhibited lower HC than SMP, however, they were not significantly different from the other systems. The results suggest that all systems tested result in an HC reduction of more than 90%. The wet bonding technique seemed to be more sensitive for dentin sealing.

Longitudinal Effect of Surface Treatments Modified by NaOCl-Induced Deproteinization and Nd:YAG Laser on Dentin Permeability

“…Some methods have been used to verify dentin permeability alterations: scanning electron microscopy (SEM) and transmission electron microscopy (TEM) enable the observation of precipitates that obliterate the dentinal tubules; 26,27 fluorescent light microscopy evaluates the depth of penetration of surface treatments 19 (clinical reports verify reduction in sensitivity after treatment, but do this subjectively); 13,17 and the model used in this study offers the possibility of direct and accurate measurement of the fluid flow that pervades the dentin in a laboratory simulation. [28][29][30] The objective of this in vitro study was to evaluate dentin permeability after dentin hypersensitivity treatments: fluoride, adhesive system, and collagen NaOCl-induced deproteinization with and without Nd:YAG laser exposure, and after erosive and abrasive challenges.…”

“…31 Four readings were performed successively on each disk at all measuring times, yielding four values of LD, of which the average (LDa) was used for calculating the filtration rate (Q). [29][30][31] Dentin permeability was expressed in values of hydraulic conductance (Lp), 28,29,31,32,34 where Lp 5 Q/A (P1-P2), where Lp = hydraulic conductance expressed in ll/cm -2 . min -1 , cmH 2 O -1 , Q = rate of filtration lL/min -1 , A = surface area in cm 2 , P1 = hydrostatic pressure of the solution within the chamber in cmH 2 O, and P2 = atmospheric pressure in cmH 2 O.…”

Relationship between air-blowing duration and bond strengths of three adhesive systems to dentin after thermal aging

“…BF is a fluoride releasing all-in-one adhesive materials, and contains phosphoric acid functional monomers. The monomers possibly reacting chemically with Ca, justifying stable performance, despite thin hybrid layer and mild acidity 21) . SBS in BF without air-drying significantly decreased after thermal aging.…”

Aplicação dos sistemas adesivos nos últimos cinco anos

“…Carvalho et al 17 analisaram o efeito dos sistemas adesivos e a estratégia de aplicação na redução da permeabilidade da dentina. Nenhum dos adesivos analisados chegou á 100 % de selamento em dentina bovina, entretanto todos os adesivos aplicados geraram um selamento próximo a 90%.…”