Effect of two bleaching regimens on enamel bonding performance

Abstract

This study evaluated the post-bleaching bonding performance of a one-step and two-step self-etch adhesive (SEA) to bleached enamel using in-office or at-home bleaching. Bovine enamel surfaces were treated with an in-office or at-home bleaching agent and divided into four post-bleach time periods: immediate, one day (1d), one week (1w) and one month (1m) before application of SEA systems. Enamel was bonded using the following procedures: Group 1: one-step SEA application (BeautiBond Multi, BBM), Group 2: two-step SEA application (FL-Bond II, FLBII). Microshear bond strengths (µSBS) were measured 24-h after bonding for each of the postbleaching time periods. Acid-base resistant zones (ABRZs) were observed under SEM. Data were analyzed using three-way ANOVA. Bleaching caused a significant decrease of the immediate µSBSs for both adhesives (p≤0.005) then increased. Thick ABRZs were observed in BBM and FLBII after bleaching. Enamel µSBSs were adversely affected by bleaching. Thick ABRZ was created with bleaching.

Effect of diode laser‐assisted bleaching on the bond strength of different adhesive systems to enamel: Interfacial SEM analysis

“…Several studies have been conducted to examine the effect of bleaching on the bond strength of resin restoratives using different types of adhesive systems (Can‐Karabulut & Karabulut, 2011; Halabi, Matsui, Nikaido, Burrow, & Tagami, 2019; McLean, Meyers, Guillory, & Vandewalle, 2015). The etch and rinse and self‐etch adhesive systems were compared, and the bonding values were decreased depending on the application time, the concentration of the bleaching gel, and the type of adhesive system (Alizadeh Oskoee, 2011; Bittencourt et al, 2010; Khoroushi & Saneie, 2012; Muraguchi, Shigenobu, Suzuki, & Tanaka, 2007).…”

Bleaching Stained Arrested Caries Lesions: In vivo Clinical Study

“…[11][12][13]21 In such a clinical scenario, dentists should take into consideration the effect of immediate bonding of composite resin restorations to the bleached surface. [35][36][37][38][39][40] As the residual oxygen from the bleaching agent would interfere with the resin polymerization and weaken the shear bonding strength, it may affect the longevity of the restoration. Therefore, dentists should wait for a period of at least 2 weeks prior to bonding.…”

“…Therefore, dentists should wait for a period of at least 2 weeks prior to bonding. [35][36][37] Overall, in-office bleaching protocol can improve the esthetics of the s-ACLs in a fast, time-efficient, and simple approach; however, it depends on the type and depth of staining involved. Therefore, it is essential to understand the stain history (nonmetallic and metallic) that contributes to the development of s-ACLs to reach an optimum bleaching outcome.…”

Update on Enamel Bonding Strategies

“…Therefore, these residual hydrophilic solvents might compete with the hydrophobic monomers that are contained in adhesive resin, for example, Bis-GMA, which triggers a nanoleakage. Halabi et al (95) reported that nanoleakage was observed in the interface between 1-SEAs and the enamel, while not observed in between 1-SEAs and the bleached enamel (95). They noted that a bleaching agent will denature enamel proteins, which may create macrospaces for more effective penetration of the adhesive monomers into the enamel.…”