The effect of different adhesives used as the immediate dentin sealing on the adhesion of the resin cement to dentin

Abstract

Immediate dentin sealing (IDS) is the process of applying dental adhesives on the fresh-cut dentin of indirect tooth preparation. The IDS could be either etch-and-rinse or self-etch adhesive systems. After IDS, the adhesive for the resin cement is applied on top of the polymerized IDS. Then the restoration is cemented. The bondability at the interfaces between IDS and the resin cement adhesive is controversial because of the different compositions between them.

Objective: To evaluate the shear bond strength of the resin cement when applied along with the immediate dentin sealings, which have different dental adhesives.

Methods: Sound human premolar teeth extracted for orthodontic treatment were selected for this study. The coronal half of the tooth was removed to receive the dentin surface. These teeth were divided into 13 groups (n=10) according to the dental adhesives (IDS) and the dental adhesives of resin cement. There were five baseline groups (no IDS); PV5, OXTR/NX3, SCB, SBU/RU(TE), and SBU/RU(SE), four groups of similar compositions of the dental adhesives; CSE-PV5, OXTR-OXTR/NX3, SBU-SBU/RU(TE), and SBU-SBU/RU(SE), and four groups of different dental adhesives; OXTR-PV5, CSE-OXTR/NX3, OXTR-SCB, and CSE-SCB. After the IDS was performed and polymerized, the surfaces were wiped with 70% ethyl alcohol and polished with pumice. A resin composite rod treated surface with sandblasting was bonded on the dentin surface with resin cement as designed. The specimens were stored in distilled water at 37 °C for 24 hours, followed by thermocycling 5,000 cycles. The specimens were encountered the shear bond test with a universal testing machine and statistically analyzed by One-Way ANOVA. A scanning electron microscope (SEM) was also used to analyze the fracture characteristics of specimens; adhesive failure and cohesive failure of each substrate.

Results: The RelyXTM UltimateTM, which applied along with the Single Bond Universal Adhesive, with either etch-and-rinse or self-etch system, had the highest shear bond strength with no statistical difference in their shear bond strength between with and without the IDS. The NX3 NexusTM with the GPDM functional monomer, the shear bond strength significantly increased when applied the IDS with the similar-composition with the resin cement adhesive. The different-composition IDS and the resin cement adhesive could not increase the shear bond strength.

Conclusion: Similar-composition of dental adhesives between the IDS and the dental adhesives of resin cement significantly provided higher shear bond strength when compared with different-compositions. When applying the Single Bond Universal Adhesive along with RelyXTM UltimateTM resin cement with or without the IDS provided the highest shear bond strength with no difference between them.

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