Effect of a desensitizing dentifrice on the bond strength of different adhesive systems

Abstract

Aim: This in vitro study evaluated the effect of using a dental hypersensitivity treatment on the bond strength to dentin of etch-and-rinse and self-etching simplified adhesive systems. Methods: 40 healthy molars were used. The crowns of teeth were removed at the dentinoenamel junction, and remaining roots were sectioned in the mesiodistal direction along their long axis, separating the buccal and lingual/palatal halves. The segments obtained were ground, keeping the buccal or lingual/palatal face turned downwards in order to flatten the surface and produce a standardized smear layer. Prepared specimens were randomly distributed into 4 groups (n=10), according to the combination of surface treatment with the desensitizing dentifrice Colgate Sensitive Pro-Relief (Colgate Palmolive ®) (test group-with dentifrice and control group-without dentifrice) and type of simplified bonding agent (etch-and-rinse and self-etching agents). Resin composite blocks were fabricated on the dentin surfaces, after application of bonding agents, and specimens were sectioned into rectangular stick-shaped specimens with cross-sectional area of approximately 0.8mm 2. For microtensile bond strength tests, 4 sticks were randomly selected from the central region of specimens, and fixed to a universal test machine. Data were analyzed statistically by the Mann-Whitney U test (a=0.05). Results: The bond strength obtained in the group without desensitizer (control) + etch-and-rinse agent was significantly higher compared with the other groups. Under both experimental conditions, the self-etching agent showed weak bond strength to dentin. Conclusions: Change in the dentin substrate by obliteration of tubules in the process of relieving dentinal sensitivity could reduce the bond strength of simplified etch-and-rinse and self-etching bonding agents.

Influence of Prolonged use of Desensitizing Dentifrices on Dentin Bond Strength of Self-Etching Adhesive System

“…However, our results differ from Cavalcanti et al (2013), which observed a significant reduction in bond strength to dentin after the use of a desensitizing dentifrice Colgate Sensitive Pro-Relief, when associated to a one-step, self-etching, bonding system. Although those bonding agents showed higher acidity compared to the one used in the present study (twostep, self-etching) (Van Meerbeek et al), which could make dentin hybridization less sensitive to the previous application of desensitizing agents, other aspects must be considered when referring to one-step, self-etching, systems: the inhibition of polymerization by the acidity of this type of adhesive system, the adhesive layer thickness, phase separation between hydrophilic and hydrophobic components, and greater sensitivity to hydrolysis (Van Meerbeek et al).…”

Shear bond strength of a "solvent-free" adhesive versus contemporary adhesive systems

“…Many factors can influence the bonding performance of adhesive systems to dentin, among these are: dentin substrate 13 , dentin treatment 14 and chemical composition of the adhesive systems, including the solvents. Bond 1 SF is a light-cured, one-coat self-etch adhesive system in which the manufacturer has removed the solvent that is contained in virtually all other adhesive systems.…”

“…solvent free adhesive system (Bond 1 SF) exhibited the statistically significant lowest bond strength (11.3±1.54 MPa) when compared with the other two adhesive systems, Braz J Oral Sci 13…”

Dentin hydraulic conductance with different application times of diamine silver fluoride/potassium iodide desensitizing solution

“…Adhesion values similar to those of non-treated dentin were generated after such treatment. [9,10] Ariffin et al studied the release of fluoride by glass ionomer cement after coating with silver fluoride. They concluded that the application of a layer of 10% silver fluoride improves the concentration of fluoride released from this material.…”