Effect of hybridization on bond strength and adhesive interface after acid-base challenge using 4-META/MMA-TBB resin

Abstract

The purposes of this study were twofold, namely to evaluate: (1) the effect of hybridization on microtensile bond strength (μTBS) to dentin, and (2) the ultrastructure of the dentin-adhesive interface with 4-META/MMA-TBB resin after acid-base challenge. Dentin surfaces, which received no treatment (NT), 65% phosphoric acid (PA), or 10% citric acid-3% ferric chloride (10-3), were bonded with a 4-META/MMA-TBB resin. To evaluate dentin bond strength, μTBS test was performed at a crosshead speed of 1 mm/min. For ultrastructural evaluation of the adhesive interfaces, SEM was used to examine the interfaces of the bonded specimens after acid-base challenge. The μTBS of NT was not determined, while that of 10-3 was significantly higher than that of PA (p<0.05). With PA and 10-3, the hybrid layer was clearly observed, but no so for the acid-base resistant zone. Wall lesion was found in NT only.In conclusion, hybridization is vital to improving μTBS to dentin and enhancing resistance at the adhesive interface against acid-base challenge.

Evaluation of dentin bonding performance and acid-base resistance of the interface of two-step self-etching adhesive systems

“…Surprisingly, the zone was not observed in acid-etching system 15) . The previous study also reported a similar phenomenon with 4-META/ MMA-TBB resin 16) . Inoue et al (2006) established a simple method of specimen preparation to characterize the ABRZ in human teeth.…”

“…They demonstrated formation of an acid-base resistant zone (ABRZ) adjacent to the hybrid layer, which was influenced by adhesive material composition. The ABRZ was observed in the self-etching adhesive systems, but not in acid etching systems 15,16) . Shinohara et al reported that the thickness of the ABRZ was increased by fluoride ion release from the adhesive 1) .…”

Dentin bonding performance and interface observation of an MMA-based restorative material

“…A similar phenomenon was confirmed in the 4-META/MMA-TBB resin 15,16) . This study assessed the morphology of adhesive-dentin interface after acid-base challenge by scanning electron microscope (SEM) and transmission electron microscope (TEM) observation 13,14,17) .…”

“…ABRZ observation was performed according to the previous studies 15,17) . Each tooth was cut into two disks parallel and cutting surfaces were ground.…”

Effect of functional monomers in all-in-one adhesive systems on formation of enamel/dentin acid-base resistant zone

“…Sample preparation for SEM observation of dentin ABRZ was established by Inoue et al 7) and successfully applied in many studies afterwards [8][9][10][11][12][13]20) . However, considering the structural differences between dentin and enamel, it was necessary to seek optimal conditions for the acid-base challenge in order to observe enamel ABRZ.…”